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  • Defragging Host OS of VMWare

    - by JackLocke
    Hi All, I want to ask something that has been puzzling me from last few days. I will try to explain my problem as clear as I can ... I have VMWare Workstation installed in my machine. And I use one separate 100Gb drive which stores all of my virtual machines, nothing else. Now, last week I was playing with a De-fragmentation tool called "Smart Defrag" which showed me in its analysis report that my drive where I am currently storing all of my Virtual Machines has more than 80% of fragmentation !!! Now my question is ... What will be the effect on my Guest / VM machine performance if I defrag my Host machine ... I mean this Host machine is essentially storing those virtual machines, but still dont have any direct access to what ever is stored in those machines ... so defraging the host should not cause any problem. But before proceeding, I want to hear from other people who may have met same problem. I will really appreciate any help ... BTW, I am using Windows 7 as Host and the guest machines I am using are Windows 2008 & 2003 & Ubuntu 10.04 THanks, Jack

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  • Blind As a Bat in Multi-Monitor Hell &ndash; Free Program Inside!

    - by ToStringTheory
    If you know me personally, then you probably know that I am going blind thanks to a rare genetic eye disease.  My eye disease has already been a huge detriment to my eyesight.  One of the big things to suffer is my ability to see small things moving fast right in front of me.  On a multi-monitor setup, this makes finding the cursor absolute hell. The Problem I’ll keep this short, as I’ve basically already told you what the problem is.  On my three monitor development computer, I am constantly losing the mouse during the day.  I had used the Microsoft accessibility mousefinder (press CTRL, and it pings around the mouse).  The problem with this is, there is only an effect around 50-100 PX around the mouse, and it is a very light gray, almost unnoticeable.. For someone like me, if I am not looking at the monitor when I click the CTRL button, I have to click it multiple times and dart my eyes back and forth in a futile attempt to catch a glimpse of the action…  I had tried other cursor finders, but none I liked… The Solution So what’s a guy to do when he doesn’t like his options?  MAKE A NEW OPTION…  What else should we as developers do, am I right?  So, I went ahead and made a mousefinder of my own, with 6 separate settings to change the effect.  I am releasing it here for anyone else that may also have problems finding their mouse at times. Some of its features include: Multiple options to change to achieve the exact effect you want. If your mouse moves while it is honing in, it will hone in on its current position. Many times, I would press the button and move my mouse at the same time, and many times, the mouse happened to be at a screen edge, so I would miss it. This program will restart its animation on a new screen if the mouse changes its screen while playing. Tested on Windows 7 x64 Stylish color changing from green to red. Deployed as a ClickOnce, so easy to remove if you don't like it. Press Right CTRL to trigger effect Application lives in notification area so that you can easily reach configuration or close it. To get it to run on startup, copy its application shortcut from its startmenu directory to the “Startup” folder in your startmenu. Conclusion I understand if you don’t download this…  You don’t know me and I don’t know you.  I can only say that I have honestly NOT added any virus’ or malware to the package. Yeah, I know it’s weird Download: ‘ToString(theory) Mousefinder.zip’ CRC32: EEBCE300 MD5: 0394DA581BE6F3371B5BA11A8B24BC91 SHA-1: 2080C4930A2E7D98B81787BB5E19BB24E118991C Finally, if you do use this application - please leave a comment, or email me and tell me what you think of it. Encounter a bug or hashes no longer match? I want to know that too! <warning type=”BadPun”>Now, stop messing around and start mousing around!</warning>

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  • Fast extraction of a time range from syslog logfile?

    - by mike
    I've got a logfile in the standard syslog format. It looks like this, except with hundreds of lines per second: Jan 11 07:48:46 blahblahblah... Jan 11 07:49:00 blahblahblah... Jan 11 07:50:13 blahblahblah... Jan 11 07:51:22 blahblahblah... Jan 11 07:58:04 blahblahblah... It doesn't roll at exactly midnight, but it'll never have more than two days in it. I often have to extract a timeslice from this file. I'd like to write a general-purpose script for this, that I can call like: $ timegrep 22:30-02:00 /logs/something.log ...and have it pull out the lines from 22:30, onward across the midnight boundary, until 2am the next day. There are a few caveats: I don't want to have to bother typing the date(s) on the command line, just the times. The program should be smart enough to figure them out. The log date format doesn't include the year, so it should guess based on the current year, but nonetheless do the right thing around New Year's Day. I want it to be fast -- it should use the fact that the lines are in order to seek around in the file and use a binary search. Before I spend a bunch of time writing this, does it already exist?

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  • Perfect End to a Bad Day

    - by TehGrumpyCoder
    Yesterday's post about A Bad Day at Work actually had an addendum to it. There were apparently a bunch of guys on ice skates last night competing in some sport way the hell and gone over on the other side of the valley, and enough people couldn't live without seeing them that they had all major arteries heading west honked. I mean honked... the traffic guy reported the 101 had 16 miles of backup... yikes. Since I worked downtown for a number of years, my fallback is to cut across the city on surface streets to get to one of my old 'haunts' and just drive it home from there. Of course with the 101 backed up, then I17 would logically be as well, so I kept the news on rather than my Zune and heard where the bad stuff was going North. I popped out on the freeway about 7 miles south of my exit. Got to the exit which is about a mile from the house without killing or maiming me or anyone else. Waited patiently at the light in the inside lane to make a left and go under the freeway proceeding West. The light changed, I had full green, I started through and whoa... I've got someone in a little rat car crossing my bow! A little explanation... I drive a 3/4 ton pickup with a V-10, extended cab and shell on the back. It's not jacked up, but it sits up pretty good and is longer than any parking place I've ever tried to put it into. I consider this truck to be the consolation prize for paying uninsured motorist coverage for 45 years and having Pilar Martinez totally destroy a 3/4 ton Silverado on March 1, 2007 by plowing into me at traffic speed while I was stopped at a light. If you pay for uninsured motorist coverage, ask your insurance agent *exactly* what that means... I bet it's different than what you think it means. But I digress, sorry... So here I am with a car that is shorter from top to road than the hood on my truck, and the driver thought it would be safe to run a red light and see if they could get past me before I got into the lane. The right side of my front bumper was almost into the driver's window when I hit the brakes and wheeled it left. Fortunately for all involved, I saw it soon enough, and pulled into the 2nd lane for making a left to go back South. I looked in my mirror, signalled a move, then moved over behind the yuck in the rat car. I then punched it, and the future hood ornament and I both made it through the next light. I pulled alongside to let her know that she was DEFINITELY Number 1 in my book, and it's a middle-age woman looking at me with a "sorry, it was an accident" show of pouty face and arms held up. Tough $hit lady... that may have worked when you were 18, but it's not working anymore, and it wasn't an accident... you ran a freakin' red light and almost got yourself killed. That just about put a bow on the day... I was home later than usual, pissed off about work stuff, pissed off at traffic, and now that. I ate dinner, watched a little TV, and was asleep about 9:30 exhausted. Hope today is better.

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  • Automated Syslog Error Solution Finder

    - by Dru
    Any automated syslog solution finding frameworks? I want my central syslog server to email a list of problems, their severity and suggested solutions. There have been several questions about centralising system logs and alternative log analysis systems, but I don't get the impression that any of them help with issue resolution. A little background: At work I am now literally doing the work of two people, and both jobs have expanded beyond their initial frameworks. It is not so bad as I have helpers, but they are little more than smart monkeys. While one of my predecessors [I have two, that is how I know I have the jobs of two people] set-up logwatch to email its results out, my monkeys don't have the skills necessary to identify unimportant data. This has caused all of them, and myself sadly, to setup email filters and ignore the whole thing until something goes "bang". It would be handy to have someone else tell them what is important, what is connected, and to suggest a few ways to resolve the issue (I could train then to research the solution first, ha!). My reading of the Splunk and Octopussy sites indicates that I still need to bring my own highly trained monkey to the party. Which I am several years from having.

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  • organizing my music and my itunes

    - by Cawas
    What can we do to organize our music? I've got over 20k items on my iTunes Library, at least 5k with ratings and play counts, apparently just 12k music files and I can't understand how this question have not been properly answered yet. Maybe there is no answer. I have too many duplicates, broken links, bad music, corrupted files... Well, a big mess with no tags! Probably there's no single software capable of just organizing everything, though I'd love one. Hopefully some time in the near future we all will be able to just sync the cloud of our automagically selected music to the newly created offline copy. But meanwhile... Please, do consider I've at least gave a shot (even while not a full test drive) to every single answer linked here already, plus a few more. I'm fine with using other software (mac too, please) to organize, but I'd need it to sync (retrieve and put back) at least iTunes ratings, because of iPhone and smart playlists. Not looking for iTunes replacement. I'm hoping to hear what you hardcore music organizers out there are using as your own solutions! :) I myself am using way too many tools, getting way too little done and end up going song by song.

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  • Unable to connect to server after a certain amount of time

    - by Troy
    I am a business FIOS subscriber with 5 static IPs. I have the following network setup: Verizon provided ONT Dlink switch Dell server running Ubuntu 12.04 with iptables enabled and a static IP address. The makes/models of hardware are: FIOS ONT Alcatel-Lucent I-211M-H ONT D-Link D-Link Web Smart Switch DES-1228P Server Dell Optiplex 755 (Ubuntu 12.04 Server) I have iptables running on the server with http, https and ssh ports open. I can connect to a website on the server from an external computer, but after a certain amount of time (mins to hours), I can no longer connect. All I have to do to re-enable connectivity is connect to the server via SSH from a computer INSIDE the network. I don't have to actually login, I just have to establish a connection. I can then access the website externally again. I did some googling and it seems some of verizon's equipment had an ARP bug where the ARP entries would expire after a certain time period, but those issues all seem to be from back in 2009 - 2010. I know the switch has an 'auto learning Mac address' feature, but I'm not sure if that could be the problem or not. Does anyone have any ideas or advice on how I can troubleshoot this? Thanks!

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  • Automated Syslog Error Solution Finder

    - by Dru
    Any automated syslog solution finding frameworks? I want my central syslog server to email a list of problems, their severity and suggested solutions. There have been several questions about centralising system logs and alternative log analysis systems, but I don't get the impression that any of them help with issue resolution. A little background: At work I am now literally doing the work of two people, and both jobs have expanded beyond their initial frameworks. It is not so bad as I have helpers, but they are little more than smart monkeys. While one of my predecessors [I have two, that is how I know I have the jobs of two people] set-up logwatch to email its results out, my monkeys don't have the skills necessary to identify unimportant data. This has caused all of them, and myself sadly, to setup email filters and ignore the whole thing until something goes "bang". It would be handy to have someone else tell them what is important, what is connected, and to suggest a few ways to resolve the issue (I could train then to research the solution first, ha!). My reading of the Splunk and Octopussy sites indicates that I still need to bring my own highly trained monkey to the party. Which I am several years from having.

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  • Flash Backed Write Cache (FBWC) without capacitor pack

    - by Martyn
    I brought a HP Smart Array P410 controller and it is installed and working fine in a HP Prolient Microserver with 4 drives in two RAID 1 arrays. I didn’t realise however that it came without any cache so would only work by directly writing straight to the disk, and the performance was horrible. So I then brought the 512MB Flash Backed Write Cache (FBWC) memory module as I was under the impression that with FBWC I would not need a battery. I got this idea from a forum post. "What do you guys think of the choice between 'BBWC' (battery backed write cache) and 'FBWC' (flash backed write cache)? The flashed based ones use non-volitile memory so need no battery." After installing the cache module however the server pretty much won’t boot. The P410 has a flashing amber light on it, and from the manual that doesn’t sound good. I’ve managed to get to the on board BIOS once and even managed to get to boot to the HP Array Configuration Utility (ACU) CD once, but every other time the Server continuingly reboots once it get to the POST screen and reads ARRAY INITILIZING %%%. The one time I reached the ACU, it reported a problem with the Cache Module. To me, it seems like the cache module is faulty, however the supplier tells me “Do you have an FBWC battery pack, p/n 587324-001, because that is required for the cache to work. If you have it, please complete an RMA form and we'll send a replacement / credit.” Does this sound right to you? I’ve been ordering the parts from the US and I don’t want to spend $77 + $40 p&p on a battery, wait a week for the shipping to find the card is faulty, and I don’t want to send back a working card?

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  • How to configure default text selection behavior in Windows XP, 7? (eg. mouse click selects entire word vs. mouse click inserts an active cursor)

    - by Mouse of Fury
    I find the mouse click behavior of Windows XP and Windows 7 annoying and intrusive. I don't remember Windows NT being quite this bad, or MacOS 7 - 10 which I used in the nineties. When I'm using a browser and I click on a text field - for example, the address bar, or a search box - the first thing which happens is the entire field is selected.Subsequent clicks seem to select parts of words, often deciding arbitrarily to exclude or include adjacent punctuation. The same in Excel and other apps, and when trying to rename files, so I'm assuming this behavior comes from a system-wide text handling routine. I frequently want to edit text, cut out or replace odd parts of the insides of words or chunks of sentences, and often find that to get a simple cursor to insert I have to click the mouse up to 4 times in succession. I've had to do a lot of this recently and it has been driving me insane. Is there a place at the system level where this can be configured? In a perfect world, I'd like a single click on a new text area to insert a cursor point, and a rapid double click to select the entire area. Words or text within the area could be selected by inserting a cursor, holding down the mouse button and dragging to the exact point where I want the selection to end - even if that's in the middle of a word. No, I don't need or want Windows to "smart select" a word or sentence for me. I've looked in the Mouse and Accessibility Options control panels (Windows XP). Haven't found anything even close. Thanks -

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  • Incredble low disk performance on HP DL385 G7

    - by 3molo
    Hi, As a test of the Opteron processor family, I bought a HP DL385 G7 6128 with HP Smart Array P410i Controller - no memory. The machine has 20GB ram 2x146GB 15k rpm SAS + 2x250GB SATA2, both in Raid 1 configurations. I run Vmware ESXi 4.1. Problem: Even with one virtual machine only, tried Linux 2.6/Windows server 2008/Windows 7, the VMs' feel really sluggish. With windows 7, the vmware converter installation even timed out. Tried both SATA and SAS disks and SATA disks are nearly unsusable, while SAS disks feels extremely slow.I can't see a lot of disk activity in the infrastructure client, but I haven't been looking for causes or even tried diagnostics because I have a feeling that it's either because of the cheap raid controller - or simply because of the lack of memory for it. Despite the problems, I continued and installed a virtual machine that serves a key function, so it's not easy to take it down and run diagnostics. Would very much like to know what you guys have to say of it, is it more likely to be a problem with the controller/disks or is it low performance because of budget components? Thanks in advance,

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  • How does Safari's Reader work and when does it show up?

    - by TestSubject528491
    Safari's Reader feature is a cool little app that displays a web page as a newspaper article --- without all the distracting sidebars, comments, and ads. Sometimes it works and sometimes it doesn't, and I'm wondering how "it knows when to show up." On my personal website, one of the pages has this option. You can click the Reader button in the URL bar and it is displayed beautifully like a page in an iBook. However, none of my other web pages (on the same site) do this. I thought it had something to do with the <article> tag, but I removed that and it still works. Anyone know how this app works? Also, does anyone know of any Chrome extensions that are just like this? Google Reader is not the same thing. PS: From the cited Apple website: Safari Reader As you browse the web, Safari detects if you are on a web page with an article. Click the Reader button that appears in the Smart Address Field and an elegant view of the article appears — without any distracting content. Not much help, is it?

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  • How to verify TRIM/discard on encrypted swap?

    - by svarni
    I am using an encrypted swap partition via ecryptfs-setup-swap on my Ubuntu 13.04 computer using a SSD. I have manually set up trim for my ext4 root partition (simply by adding the "discard" option in /etc/fstab). I also manually ran fstrim on the root partition prior to booting and using dstat I saw that for a few seconds several GB/s of data have been written to the disk. That was presumably the effect of the trim command. These high writerates are reproducable by deleting huge files and have not occured before setting up trim, so I take them as evidence for working trim/discard. Manually enabling trim on my root partition has stopped the wearout of my precious new disk from 365 used reserved blocks (out of 6176 total) within three months down to 0 additional used reserved blocks within three additional months (data from SMART attributes). Because I want to minimize the wearout of my SSD I now would like to know whether my swap partition (which is encrypted using ecryptfs-setup-swap) also makes use of the trim/discard option. I tried sudo swapon -d -v /dev/mapper/cryptswap1 but did not receive particular information ("-v") about whether trim/discard ("-d") was applied. If unsupported, i would expect a message. Then I tried sudo dd if=/dev/sda6 count=1 BS=1M | xxd | less directly after booting and when no swapspace was used but I saw not only zeroes. I assume, when looking at freshly trimmed regions, the disk would send zeroes instead of reading random sectors (and according to some forums, (unencrypted) swap space is trimmed once upon boot). Long story short: Are there any ideas on how to test if trim is effectively used for my encrypted swap? And if not, any ideas on how to - at least manually, for once - trim the whole swap space? I wouldn't want to tinker with the partition itself, because I dont know if it needs to be reinitialized as (encrypted) swap - I dont want to be left with an unbootable system :)

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  • How do I permanently delete /var/log/lastlog?

    - by GregB
    My /var/log/lastlog file is huge. I know it's really only a few kilobytes, but tar isn't smart enough to know that, so when I image a virtual machine, my restore fails because it thinks I'm trying to load more data than I have capacity on my disk. I want to delete /var/log/lastlog and stop any and all logging to the file. I'm aware of the security implications. This logging needs to stop to preserve my backup strategy. I've made a change to /etc/pam.d/login which I was told would disable logging to /var/log/lastlog, but it does not appear to work as /var/log/lastlog keeps growing. # Prints the last login info upon succesful login # (Replaces the `LASTLOG_ENAB' option from login.defs) #session optional pam_lastlog.so Any ideas? EDIT For anyone interested, I use Centrify Express to authenticate my users via LDAP. Centrify Express is "free", but one of the drawbacks is that I can't manage user UIDs via LDAP, so they are given a dynamic UID when they login to a server. Centrify picks some crazy high UID values (so they don't conflict with local users on the server, presumably). /var/log/lastlog is indexed by UID, and grows to accommodate the largest UID on the system. This means that when a Centrify user logs in, they get a UID in the upper-end of the UID range, which causes lastlog to allocate an obscene amount of space, according to the file system. ~$ ll /var/log/lastlog -rw-rw-r-- 1 root root 291487675780 Apr 10 16:37 /var/log/lastlog ~$ du -h /var/log/lastlog 20K /var/log/lastlog More Into --- Sparse Files

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  • Managing Internal Yum Repository Groups

    - by elmt
    What is the best method for handling yum groups dependencies? For example, take this comps.xml file <comps> <group> <id>production</id> <name>Production</name> <default>true</default> <description>Packages required to run</description> <uservisible>true</uservisible> <packagelist> <packagereq type="default">ssh</packagereq> </packagelist> </group> <group> <id>development</id> <name>Development</name> <default>false</default> <description>Packages required to develop</description> <uservisible>true</uservisible> <packagelist> <packagereq type="default">gcc</packagereq> </packagelist> </group> </comps> which is packaged with createrepo -g comps.xml x86_64. The ssh and gcc rpms are not installed in the x86_64 directory. If I run yum groupinstall development, yum is smart enough to pull the gcc package from the RHEL repo even though the groups are defined in my internal repository. However, is this the proper way of doing this, or should I copy the rpms to my local repository and recreate the repo?

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  • Write once, read many (WORM) using Linux file system

    - by phil_ayres
    I have a requirement to write files to a Linux file system that can not be subsequently overwritten, appended to, updated in any way, or deleted. Not by a sudo-er, root, or anybody. I am attempting to meet the requirements of the financial services regulations for recordkeeping, FINRA 17A-4, which basically requires that electronic documents are written to WORM (write once, read many) devices. I would very much like to avoid having to use DVDs or expensive EMC Centera devices. Is there a Linux file system, or can SELinux support the requirement for files to be made complete immutable immediately (or at least soon) after write? Or is anybody aware of a way I could enforce this on an existing file system using Linux permissions, etc? I understand that I can set readonly permissions, and the immutable attribute. But of course I expect that a root user would be able to unset those. I considered storing data to small volumes that are unmounted and then remounted read-only, but then I think that root could still unmount and remount as writable again. I'm looking for any smart ideas, and worst case scenario I'm willing to do a little coding to 'enhance' an existing file system to provide this. Assuming there is a file system that is a good starting point. And put in place a carefully configured Linux server to act as this type of network storage device, doing nothing else. After all of that, encryption on the files would be useful too!

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  • How can I make the Firefox Password Manager more intelligent?

    - by Philip
    I have two major gripes about the FF password manager: If I restore a session with multiple tabs with sites with saved passwords, the master password prompt pops up once for each of them, even if I correctly enter the password the first time. Sometimes I want Firefox not to use my saved passwords at all (e.g. because I want to let someone else use it without getting access to my accounts), but hitting cancel results in erratic behavior--sometimes the box just pops up again and again, or sometimes it stops and behaves as I wish (continuing to browse w/o my passwords) until it encounters another site that wants my password. Thus even when hitting cancel does leave me free to browse passwordless, it doesn't get Firefox to leave me alone for the whole session. Thus: do you know of any tweak or add-on that could (1) make Firefox smart enough to get my master password once and then leave me alone, and/or (2) add an option (checkbox-style, toggle button, etc.) to browse "for now" (until I toggle the option) or even "for this session" (until I restart) without using any of my saved passwords? I'm running Firefox 3.5.6 on Mac OS X 10.5; thanks.

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  • Fixed ruby/mysql connection with new libmysql.dll, and broke Apache in the process

    - by jmtoporek
    Ok so bit of background - all my development has been on a local Windows 7 machine. I had Apache with PHP/MySQL running with no issues. Been using ruby (1.9.3 and latest rails release 3.2.9) with built in webrick server, but had a devil of a time connecting to mysql. Did some research, updated my libmysql.dll file in c:/ruby/bin and it worked! Very happy... except now Apache stopped working. In my attempt to resolve the issue I found an older copy of libmysql.dll, renamed the new file, copied the old file back to c:ruby/bin and apache works, ruby does not. So I can take this ass backwards approach but obviously this seems pretty stupid. I was surprised that Apache was using the dll file in ruby/bin folder. I presume this is related to path variables perhaps? I guess I was hoping someone could direct me as to how I can use one dll file for apache and another for ruby. Or if you have some other smarter approach - I've smart enough to follow directions to install apache from scratch and enable php on windows as well as ubuntu, but I'm not much of a sys admin, just a semi competent web developer.

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  • FTP Server upload and filesystem questions

    - by Alex
    I'm a photographer who mainly does event photography. A while ago I bought myself a Nikon WT-4 wireless transmitter, a small device which connects via USB to my Nikon D700 DSLR, and then establishes a WiFi connection to an existing WLAN. It can then upload any pictures I take via FTP to an FTP server somewhere in the network. On my laptop I then have a piece of software which will check a given folder on the disk regularly, this software is smart enough to look at the modified file timestamp, if this timestamp is less than 10 seconds ago, it will not attempt to import the folder and skip the file in this iteration of the import scan. The problem I've discovered seems to be inherent to the FTP protocol, as I have the same problem with Windows 7 built in IIS server, as I do with FileZilla FTP server. When the transmitter starts to upload a file, the FTP server will create a small 300-500 KB file with the correct filename on the disk, but then do nothing with the file until it has completely received the file via FTP. So it seems to create this small dummy file, and then buffer the remainder of the FTP upload until it's finished, and then dump the rest of the file into the dummy file making it the correct size. Problem is, these uploads take about 15-30 seconds depending on reception, but since the folder watch tool will already try to import any file older than 10 seconds, it will always try to import the small dummy files which obviously fails as they're not copmlete yet. Is there any way to 'disable' this behaviour? Ideally I would like my file only to show up once it's been completely uploaded. Or perhaps someone knows another FTP server application (it has to run on win7) which does not show this behaviour?

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  • Come up with a real-world problem in which only the best solution will do (a problem from Introduction to algorithms) [closed]

    - by Mike
    EDITED (I realized that the question certainly needs a context) The problem 1.1-5 in the book of Thomas Cormen et al Introduction to algorithms is: "Come up with a real-world problem in which only the best solution will do. Then come up with one in which a solution that is “approximately” the best is good enough." I'm interested in its first statement. And (from my understanding) it is asked to name a real-world problem where only the exact solution will work as opposed to a real-world problem where good-enough solution will be ok. So what is the difference between the exact and good enough solution. Consider some physics problem for example the simulation of the fulid flow in the permeable medium. To make this simulation happen some simplyfing assumptions have to be made when deriving a mathematical model. Otherwise the model becomes at least complex and unsolvable. Virtually any particle in the universe has its influence on the fluid flow. But not all particles are equal. Those that form the permeable medium are much more influental than the ones located light years away. Then when the mathematical model needs to be solved an exact solution can rarely be found unless the mathematical model is simple enough (wich probably means the model isn't close to reality). We take an approximate numerical method and after hours of coding and days of verification come up with the program or algorithm which is a solution. And if the model and an algorithm give results close to a real problem by some degree that is good enough soultion. Its worth noting the difference between exact solution algorithm and exact computation result. When considering real-world problems and real-world computation machines I believe all physical problems solutions where any calculations are taken can not be exact because universal physical constants are represented approximately in the computer. Any numbers are represented with the limited precision, at least limited by amount of memory available to computing machine. I can imagine plenty of problems where good-enough, good to some degree solution will work, like train scheduling, automated trading, satellite orbit calculation, health care expert systems. In that cases exact solutions can't be derived due to constraints on computation time, limitations in computer memory or due to the nature of problems. I googled this question and like what this guy suggests: there're kinds of mathematical problems that need exact solutions (little note here: because the question is taken from the book "Introduction to algorithms" the term "solution" means an algorithm or a program, which in this case gives exact answer on each input). But that's probably more of theoretical interest. So I would like to narrow down the question to: What are the real-world practical problems where only the best (exact) solution algorithm or program will do (but not the good-enough solution)? There are problems like breaking of cryptographic ciphers where only exact solution matters in practice and again in practice the process of deciphering without knowing a secret should take reasonable amount of time. Returning to the original question this is the problem where good-enough (fast-enough) solution will do there's no practical need in instant crack though it's desired. So the quality of "best" can be understood in any sense: exact, fastest, requiring least memory, having minimal possible network traffic etc. And still I want this question to be theoretical if possible. In a sense that there may be example of computer X that has limited resource R of amount Y where the best solution to problem P is the one that takes not more than available Y for inputs of size N*Y. But that's the problem of finding solution for P on computer X which is... well, good enough. My final thought that we live in a world where it is required from programming solutions to practical purposes to be good enough. In rare cases really very very good but still not the best ones. Isn't it? :) If it's not can you provide an example? Or can you name any such unsolved problem of practical interest?

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  • Windows 7 doesn't start anymore

    - by 0xFF
    I've experienced some BSOD on windows 7 RC, and some freezing when startup, but today was big surprise, it doesn't start anymore. I tried to start on safe mode and no results too, it shows the starting animation, then a blue screen for less than a second and turns off immediately. The only thing I remember did today is update flash player under Firefox, then chrome stopped working even after logging off, and once restarting, it doesn't start anymore. Anyone experienced the same issue? any hints? [EDIT 3] Solved : Windows 7 have a very smart repair strategy, it works automatically, and it tried every possible fix, what fixed my problem was the system restore to a previous date, all this happened automatically. [EDIT2] these are the last lines in the ntbtlog.txt file Did not load driver \SystemRoot\System32\drivers\vga.sys Loaded driver \SystemRoot\System32\Drivers\NDProxy.SYS Did not load driver \SystemRoot\System32\Drivers\NDProxy.SYS Did not load driver \SystemRoot\System32\Drivers\NDProxy.SYS Did not load driver \SystemRoot\System32\Drivers\NDProxy.SYS Did not load driver \SystemRoot\System32\Drivers\NDProxy.SYS Loaded driver \SystemRoot\system32\drivers\CHDRT32.sys Loaded driver \SystemRoot\system32\DRIVERS\VSTAZL3.SYS Loaded driver \SystemRoot\system32\DRIVERS\VSTDPV3.SYS Loaded driver \SystemRoot\system32\DRIVERS\VSTCNXT3.SYS Loaded driver \SystemRoot\system32\drivers\modem.sys Loaded driver \SystemRoot\system32\DRIVERS\usbccgp.sys Loaded driver \SystemRoot\System32\Drivers\usbvideo.sys [edit] this is the BSOD I get : http://twitpic.com/i87cx Thank you.

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  • Cloning a failing disk (Win 7)

    - by daveh551
    I have a Windows 7 machine with several partitions on a 1.5T drive. Windows has been complaining about disk errors and imminent failure, so I have purchased a new 2TB drive. The failing disk has not completely failed, and, in fact, I was able to boot Windows from it (after a couple tries) and examine the SMART logs - the only RED item was 1 sector being reallocated. But when I try to Clone it to the new Drive using Acronis True Image Home (2010), True Image can see the drive, the partitions, and the contents, but when it goes to actually do the clone, it says "Failed to move. Make sure the destination disk is not smaller than the source disk, and that there are not errors on the disk" (or something like that). What are some other options for simply cloning the failing drive. I'd like to clone the entire disk, but am willing to do it partition by partition if necessary. Was this a known failing of the 2010 edition of ATI, or is it really something hosed in my system. Would upgrading to the 2012 edition be likely to work any better? (I'd download the trial and try it out, but if I remember right, the cloning operation is disabled in the trial version), and I don't have enough free disk space to make an entire image.) What are some other cloning software packages if ATI won't work? Note that I'm only looking to clone the disk, not make an image as a back up - I use Ghost for that, and can fall back to that if I have to. It looks to me like CloneZilla would do the job. Any recommendations? Thanks, and if this duplicates other questions, I apologize.

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  • How do I make a PPT file as small as possible?

    - by grunwald2.0
    Currently I am agonizing over several large presentation files, which I happened to reprint to PDFs... One thing I wondered: Do PPT's (from Microsoft Powerpoint) always to have to be that big? And what would be the strategies to make a PPT smaller? (If we say "ceterus paribus" at e.g. 25 slides and assuming that one isn't allowed to use a cloud-based service like GDocs, rocketslide or Prezio.) Of course there are the obvious "bad guys": Images and graphics. But: How about roll-over animations etc, who knows how much space they take? How about "smart arts"? Could one save file size if one would use "Open Office" or "Libre Office" Impress? (I didn't try it yet.) And "what if": What if we need to include e.g. five images (or charts that can't be remade in Excel in time), how would we best reduce the file size impact of those five images, if we needed to? I ask all this from an honest "business" perspective. I am no nerd or "Microsoft MVP" and I don't intend on delving into LATeX or similar yet. But that doesn't mean that I am not curious and very willing to learn. I am basically interested in (proven) best practices. Yes I know this question is lacking "initial research", but I think the perspective of my question is interesting and unique to a lot of people and if we intend to make SE a "Q&A" / Wiki kind-of reference site, this question might be a good way to "collect" advice on a question that has a very defined goal: Minimum file-size.

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  • How can I extract data from Toshiba Satellite with a dead Windows installation?

    - by msanford
    I've got a Toshiba Satellite (unknown model number but bought early 2010) running Windows Vista which throws a kernel error on boot. We don't have the restore/recovery CD any more to restore the Windows partition. I have managed to boot to a Live CD version of Ubuntu 10.10 and have mounted the internal hard drive (which takes nearly 8 minutes). I suspect that the hard drive is malfunctioning, however, because copy tasks of even 30 megs of data to an attached and mounted USB flash drive takes over an hour, and some files are mysteriously inaccessible (not a permissions issue). When browsing folders, it takes many minutes to populate the folder window even with a single tiny file. During the copy tasks, the hard disk sounds like it tries to sleep several times in rapid succession, then continues accessing, it sounds, at full throughput. I initially tried using scp (from the shell) to copy data but I encountered the same local problems. I don't know the S.M.A.R.T. status of the hard disk, either. Is there a more effective way of going about recovering the data on the internal disk, assuming that I can't use a recovery CD and am too cheap to bring it in (for now, at least)?

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  • Network bandwidth usage dashboard?

    - by SkippyFlipjack
    I have a couple of wifi access points hooked up to my home network, one of which I keep unsecured for some development I do; there are only a couple other homes within range and they've got their own wifi so it's not a big concern. I also have a Sonos system, Tivo, Roku, a couple laptops, a couple phones, an iPad and a desktop machine, all of which are internet-smart. So when my internet bandwidth tanks and it takes five minutes to load a YouTube video, I want to know what's going on, and there are many potential culprits. I'd like to be able to plug my MacBook into the primary router and see a nice little dashboard of the units on the network and what kind of bandwidth each is using at that moment. I could figure this out from WireShark or tcpdump but figure there has to be an easier way. I've tried a few different commercial products but none really presented the right info. Suggestions? (This may be a question for superuser since my Apple Time Capsule's SNMP capabilities are limited, but I figure admins of small business networks would have dealt w/ the same issue..)

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