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• Clearing Windows file share "memory"

  - by Tom Shaw

  I'm currently upgrading a Samba file server (from 3.0.23d to 3.4.3). I have a problem on the Windows client side: if the client was accessing a UNC path or mapped drive from the Samba server before the upgrade, then after the upgrade those paths or drives are not accessible. However, I can consistently resolve the client side problem for good by rebooting the client and then re-mapping all of the mapped drives. The problem appears to be related to the client's "memory" of the pre-upgrade Samba server, which the reboot and re-map clears. I have the same issue and same fix on Windows XP SP3 and Windows Server 2003 SP2. This question is specifically: is it possible to reproduce the benefits of the Windows reboot without actually rebooting the client? I have tried restarting various Windows services, disabling and enabling the network, logging out and back in again, but nothing except a reboot appears to do the trick.

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• Accidentally deleted the software for MyPassport Essential SE 1TB Hardrive

  - by user26192

  Hi, I'm posting for a friend of mine. She bought a WD MyPassport Essential SE 1 TB Hard drive the other day. When she plugged in the USB in her lap top, the driver cannot be recognized by the smart ware software. While she was doing a back up of her files, McAfee was running in the background. Since the backup was taking so long to finish, she decided to pause it. She tried to delete the partially backed up files, but instead, she accidentally deleted the entire file in the folder including the pre-installed software. Now, when she tries to start up the MyPassport, the smart ware doesn't show up anymore. Can someone please give us advice what can she do about this? Thank you.

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• How to convert OpenVZ OS templte to bootable to image file?

  - by Medi

  My question is how to convert a pre-created OpenVZ OS template which are in tar.gz format (such as these) to an image file in order to be able boot it with other virtualization solutions such as QEMU or VirtualBox. In order to achieve this, I made an empty image file, I partitioned it, and made two partition, a primary partition and a extended partition for swap. I made the first partition ext3 (0x83) and the other one swap (0x82). Then I made the first one bootable, and copied the content of tar.gz to the first partition. But when I try to boot, it hangs at the first stage of booting.

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• Thunderbird message sorting - wrong dates

  - by Unsigned

  Thunderbird 3 is having a problem with one of my IMAP accounts. When sorted by date, it displays 10-15 messages at the top (newest) when in fact they are very old message. (pre-2010, over a year old, some up to 6-7 years old) It's not game-breaking, but it is annoying, as I have to look past those to check for "new" messages. Is there any way to fix this? I'd considered re-downloading all the messages via IMAP, but that would take weeks (50,000 messages). When I open it, it displays the correct date, also when I use "View Source" the Date: header has the correct date (2009, 2006, etc). Is there any way to make Thunderbird realize that it should be sorted down with the rest of the 2006/2009 messages? None of my other IMAP accounts (many with the same host server) have this issue.

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• Hardware specs for web cache

  - by Raj

  I am looking for recommendations for hardware specs for a server that needs to be a web cache for a user population of about 2,000 concurrent connections. The clients are viewing segmented HTTP video in bitrates ranging from 150kbps to 2mbps. Most video is "live" meaning segments of 2-10 secs each, of which 100 or so are maintained at a time. There are also some pre-recorded fixed length videos. How would I go about doing the provisioning calculation for such a server: What kind of HDD (SSD?), how many NICs how much RAM etc? I am thinking of using Varnish on Linux, all the RAM I can get my hands on, 2 CPUs with 6-8 cores each.

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• Windows 7 Enterprise, Service Pack 1. Software MS Office Excel 2010

  - by user327560

  In Excel I understand there is no mechanism to customise & re-label the Rows & Columns (i.e. Renaming Col. A to some text like "Item Number" and so on. My question is regarding if it's possible to start Row Numbering at zero, or to determine a pre-allocated number of rows which contain my Headers, and then the first Row with the detail is infact seen as Row 1? Reason for question is I work multiple INternational Projects and we use Excel to trsack alot of activities & issues. Oddly, many people will refer to, for example "Point 7"... Some people mean the ID 7 (which I have the first Column dedicated to ID Number), some mean Excel Row 7, which infact could be really ID 3, or 4 from Col. A.... Any easy way or workaround to just use the Excel Row Numbers but select from when Row 1 is counted?

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• Is there a way to ignore Cache errors in Django?

  - by Josh Smeaton

  I've just set our development Django site to use redis for a cache backend and it was all working fine. I brought down redis to see what would happen, and sure enough Django 404's due to cache backend behaviour. Either the Connection was refused, or various other errors. Is there any way to instruct Django to ignore Cache errors, and continue processing the normal way? It seems weird that caching is a performance optimization, but can bring down an entire site if it fails. I tried to write a wrapper around the backend like so: class CacheClass(redis_backend.CacheClass): """ Wraps the desired Cache, and falls back to global_settings default on init failure """ def __init__(self, server, params): try: super(CacheClass, self).__init__(server, params) except Exception: from django.core import cache as _ _.cache = _.get_cache('locmem://') But that won't work, since I'm trying to set the cache type in the call that sets the cache type. It's all a very big mess. So, is there any easy way to swallow cache errors? Or to set the default cache backend on failure?

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• Non-Latin characters in URLs - is it better to encode them or replace with their Latin "counterparts

  - by Pawel Krakowiak

  We're implementing a blog for a site which supports six different languages and five of them have non-Latin characters in their alphabets. We are not sure whether we should have them encoded (that is what we're doing at the moment) Létání s potravinami: Co je dovoleno? becomes l%c3%a9t%c3%a1n%c3%ad-s-potravinami-co-je-dovoleno and the browser displays it as létání-s-potravinami-co-je-dovoleno. or if we should replace them with their Latin "counterparts" (similar looking letters) Létání s potravinami: Co je dovoleno? becomes letani-s-potravinami-co-je-dovoleno. I can't find a definitive answer as to what's better from SEO perspective? Search engine optimization is very important for us. Which approach would you suggest?

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• wireless printer - entering WPA - is there a quicker way?

  - by camcam

  I have a wireless printer (Brother DCP-585CW). The wireless setup instruction says I should enter the WPA key to the printer. The key is entered using up and down buttons on the printer. So, I am supposed to enter 64 characters using up and down buttons. To enter 1 character, it takes on average (24+10)/2 = 17 times pressing the button (digits start after 24 letters). So 17*64 = 1088 times. Is there a quicker way to setup a wireless printer? Maybe there is a Windows program that discovers printers connected to computer through USB or Ethernet (my printer has both sockets) and allows to pre-configure it for wireless usage (enter the long WPA key)? Update There is BRAdmin program and it allows to set up almost all wireless settings... almost - all except WPA :(

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• JSF Pages call ManagedBeans that are not defined on the page and call all getters sometimes more tha

  - by Bill Leeper

  I have several JSF pages that are initializing and accessing ManagedBeans that are not even used on that page. This is creating a really hairy problem for initialization. I either have to make them all session scope and continually make calls to re-inialize or take the performance hit of having them read large amounts of data from the DB whenever they decide to initialize. Some of the managed beans being accessed are not even defined on the page in question. I have done some optimization based on comments related to multiple calls to getters, but I still have the issue that I have a very specialized (and expensive to initialize) bean that is getting called when I don't want it initialized. Any insight into why/what JSF calls might do something like this. I have a very complex page making use of JSTL, Tomahawk and standard JSF tags. I could include code, but its very complex and sensitive in nature.

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• Is there a way for one SSH config file to include another one?

  - by Joe Casadonte

  In case it matters: OS: Ubuntu 10.04 SSH: OpenSSH_5.3p1 Debian-3ubuntu5 I'd like one SSH config file to include another one. The use case would be to define whatever I want in my default .ssh/config file and then pre-pend a couple of extra things in a separate file (e.g. ~/.ssh/foo.config). I want the second file to incorporate the first one, though, so I don't have to duplicate everything in the first one. Is that doable? Thanks!

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• Python design mistakes

  - by Andrea

  A while ago, when I was learning Javascript, I studied Javascript: the good parts, and I particularly enjoyed the chapters on the bad and the ugly parts. Of course, I did not agree with everything, as summing up the design defects of a programming language is to a certain extent subjective - although, for instance, I guess everyone would agree that the keyword with was a mistake in Javascript. Nevertheless, I find it useful to read such reviews: even if one does not agree, there is a lot to learn. Is there a blog entry or some book describing design mistakes for Python? For instance I guess some people would count the lack of tail call optimization a mistake; there may be other issues (or non-issues) which are worth learning about.

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• Is there a difference in page fault rates between CPU bound and I/O bound processes?

  - by user198864

  I was thinking, should there be any difference in expectation of the page fault rate on CPU-bound vs I/O bound processes? At first I thought maybe we could, since CPU-bound processes would likely be using more memory accesses per time quantum, so I expect it would move from locality to locality faster. At the same time, the CPU-bound process is probably given a larger working set... but this doesn't affect the fault overhead as it hits a new locality IF this wasn't pre-paged in. Is there actually any real difference in the page fault rates or am I just musing about something nonexistent? And if there is, how would it impact a real-world OS like linux?

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• Reinstall default apps on Galaxy S3 before updating to Jelly Bean [migrated]

  - by Bruno-P

  I want to update my Galaxy S3 to Jelly Bean but after downloading the firmware using Kies, it starts updating, but then it stops with a "dead" Android with a red triangle icon. I think it's because I have removed some default apps like ChatOn and Yahoo widgets. Is there any way to get them back or to install the official Jelly Bean update without a factory reset? I don't want to reinstall my apps again and lose my settings each time I need to update the OS (I also don't want bloatware apps that are pre-installed). Any ideas?

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• several hard drives and partitions

  - by Tim

  If there are two physically separate hard drives, should they be treated as two pre-defined partitions? If yes: should they be treated as two primary partitions (including one or two of them can become extended partition(s) and be further subdivided into logical partitions)? Or they (or one part of each) can be treated as two logical partitions of a extended partition? Thanks! I intended to ask if there can be a primary/logical partition that are partially on both hard drives? And if there can be a logical partition on a hard drive and another logical partition on another hard, and the two logical partitions belong to the same extended partition? I guess the answers to both questions are no?

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• How to Optimize Combined Graphical Operations?

  - by Sunny

  Hi, Here is a Scenario, A series of operations that I will call for painting, QPainter p(this); 1). p.fillRect(0,0,320,240, RED_COLOR) 2) p.drawLine(0,0,100,100, BLUE_COLOR) 3) p.fillRect(0,0,320,240, YELLOW_COLOR) Now I want that painter should not draw first FillRect Function. It should not draw line. It should only perform last operation. Is there any way to achive this optimization in Qt. Is this type of drawing/painting optimizations are supported by any library?

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• how to actually install PHP etc on a windows 2003 server

  - by user1624421

  We're just purchasing a dedicated windows 2003 server (in fact I think it's a VPS) How do we actually go about installing software on to it? Simply searching for "installing PHP5 on windows server" just produces material about installing it as if one had access to the computer with a keyboard and mouse. Am I being thick? I've had experience managing a linux server before but that had everything pre-configured and we accessed it via Web Hosting Manager. I don't get the actual concept of connecting to a remote PC and...downloading files? If there's any good books available please point me in the right direction.

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• What OS for Eee PC ?

  - by crivateos

  Hello. I've just bought new Eee PC 1005 (with Atom N450, 250GB and 2GB memory) without any pre-installed system. Now I'd like to install windows and linux distribution on in. What should I choose ? I am a programmer and web designer, so I need Java IDE , Python interpreters, and Photoshop (on windows). Will Win 7 Pro 32bit work ?Or should I choose Windows XP ? And what about linux distro ? Ubuntu, Eeebuntu, Ubuntu netbook edition ? btw is it true that linux's grub overrides mbr so that hardware system restore doesn't work ?

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• Select rows where column LIKE dictionary word

  - by Gerve

  I have 2 tables: Dictionary - Contains roughly 36,000 words CREATE TABLE IF NOT EXISTS `dictionary` ( `word` varchar(255) NOT NULL, PRIMARY KEY (`word`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1; Datas - Contains roughly 100,000 rows CREATE TABLE IF NOT EXISTS `datas` ( `ID` int(11) NOT NULL AUTO_INCREMENT, `hash` varchar(32) NOT NULL, `data` varchar(255) NOT NULL, `length` int(11) NOT NULL, `time` int(11) NOT NULL, PRIMARY KEY (`ID`), UNIQUE KEY `hash` (`hash`), KEY `data` (`data`), KEY `length` (`length`), KEY `time` (`time`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=105316 ; I would like to somehow select all the rows from datas where the column data contains 1 or more words. I understand this is a big ask, it would need to match all of these rows together in every combination possible, so it needs the best optimization. I have tried the below query, but it just hangs for ages: SELECT `datas`.*, `dictionary`.`word` FROM `datas`, `dictionary` WHERE `datas`.`data` LIKE CONCAT('%', `dictionary`.`word`, '%') AND LENGTH(`dictionary`.`word`) > 3 ORDER BY `length` ASC LIMIT 15 I have also tried something similar to the above with a left join, and on clause that specified the like statement.

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• Access static constant variable from multiple threads in C

  - by user325519

  I have some experience with multithread programming under Linux (C/C++ & POSIX threads), however most obvious cases are sometimes very complicated. I have several static constant variables (global and function local) in my code, can I access them simultaneously from multiple threads without using mutexes? Because I don't modify them it should be ok, but it's always better to ask. I have to do heavy speed optimization, so even as fast operations as mutex lock/unlock are quite expensive for me, especially because my application is going to access these variables form long loops.

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• Is "}while(0);" always equal to "break;}while(1);" ?

  - by Hernán Eche

  I have compared gcc assembler output of do{ //some code }while(0); with do{ //some code break; }while(1); The output is equal, with or without optimization but.. It's always that way? No experiment can prove theories, they can only show they are wrong And because (I hope) programming is not an experimental science, and results can be predicted (at least simple things) I want to be sure next time I reeplace a break;}while(1); for the clearer (and less risky) while(0); Thank you for reading

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• Copy/Paste including Hidden Columns when Filtering Rows in Excel 2010

  - by hudsonsedge

  I suspect the solution will be related to this question?? I have a spreadsheet that comes to me pre-formatted with hidden columns sprinkled in multiple places (for viewing brevity's sake). I need to turn on filtering, apply a filter to one of the columns, and then paste the resulting rows to a new sheet - including the hidden columns (lather, rinse, repeat). I'd prefer to not undo/re-do the hidden columns unless I have to. Is it possible to paste the hidden columns without adding the extra steps?

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• How to make a Windows 8 clean install without prior Windows installation or key?

  - by fmsf

  I've been a Mac user for ages and I don't have any copy of Windows (xp, vista or 7). So I need to make a clean install on my custom built pc currently running Linux. I have found some information regarding the existence of a "Windows 8 pro system builder" which will allow clean installs in blank disks without any pre-requisites for prior Windows versions, but all information is very vague and without references. Does anyone know how to do this kind of installation? Where can I buy the Windows 8 system builder?

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• Can I replicate some of the optimisations done by the JVM by hand?

  - by Subb

  I'm working on a Sudoku solver at school and we're having a little performance contest. Right now, my algorithm is pretty fast on the first run (about 2.5ms), but even faster when I solve the same puzzle 10 000 times (about 0.5ms for each run). Those timing are, of course, depend of the puzzle being solved. I know the JVM do some optimization when a method is called multiple time, and this is what I suspect is happening. I don't think I can further optimize the algorithm itself (though I'll keep looking), so I was wondering if I could replicate some of the optimizations done by the JVM. Note : compiling to native code is not an option Thanks!

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• Is there a way to launch an aggressive and complete garbage collection in Java?

  - by Gnoupi

  For memory optimization reasons, I'm launching myself the garbage collector during profiling, to check if objects are correctly cleaned after disposing of them. The call to garbage collector is not enough, though, and it seems that there is no guarantee of what it will clean. Is there a way to call it, to be sure it will recover as much as it can, in profiling conditions (this would have no point in production, of course)? Or is "calling it several times" the only way to be "almost sure"? Or did I simply misunderstand something about the Garbage Collector?

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