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• How to find sum of elements from given index interval (i, j) in constant time?

  - by Rajendra

  Given an array. How can we find sum of elements in index interval (i, j) in constant time. You are allowed to use extra space. Example: A: 3 2 4 7 1 -2 8 0 -4 2 1 5 6 -1 length = 14 int getsum(int* arr, int i, int j, int len); // suppose int array "arr" is initialized here int sum = getsum(arr, 2, 5, 14); sum should be 10 in constant time.

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• What is effective on time of transfering files between two Memories? [closed]

  - by Mehdi

  I think the number of files is so effective in time of transfering files for example : Transfering 1000 item that have 1GB size need more time than transfering 1 file with same size.

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• Returning a value from a function after an elapsed amount of time?

  - by Achilles

  I have a web service in ASP.NET being called by a time-sensitive process. If the web service takes longer than N seconds to run I want to return from the call so the time sensitive operation can continue. Is this possible and if so what is the code for this?

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• how to insert date & time to DateTimePicker in C# ?

  - by Gold

  hi i want to insert date & time to DateTimePicker. for example: date: 03/08/2009 time: 06:45 how i can do it in C# ? thank's in advance

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• Choosing a very basic Linux distro with minimal boot time?

  - by user30961

  I've had Ubuntu for a year now, like it but it doesn't match my needed configuration for my old laptop. So... I am using Linux mainly for webapps so I don't care much about user interface. What I need is a distro which is small enough to install on a SD memory card (or USB) since I am removing the hard drive, all my data is in the cloud. I also want it to have as short boot time as possible. I tried Puppy Linux and it seems ok but it had preinstalled looots af small apps I don't need, I would really like to have a distro with minimal preinstallations and add them on my own. So what are my choices and why would you recommend these?

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• Can't login into Fedora 14 (XFCE) desktop. For the second time.

  - by bubba88

  Hello. I'm experiencing a problem with my Fedora 14 XFCE spin, which doesn't seem to let me pass the login screen: I enter my password for my user record, authentication passes (no 'Authentication Failure' message, which was when I tried to login as 'root' without root login enabled), and the screen becomes black (command line) for a couple of seconds and (voila!) my login screen emerges again. I did nothing to cause that, it just suddenly logged me out when I was editing window manager settings via XFCE's built-in GUI utility (choosing window decorations style, from the listbox on the left) For the first time, I had to boot from live CD and do a fresh install, but I don't really want to do that again :) Is there some way to repair this (maybe login via command line and reset window manager settings, I don't know really)? Thank you very much in advance!

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• Is it possible to have a computer run two OS's in memory at the same time?

  - by Hebon

  I'm sick of needing to reboot my computer every time I wish to use another OS, or run a virtual machine that skimps on power. With the onset of large amounts of memory for computers nowadays I began to think that there must be some way to run two OS's in memory with a way to switch between the two. In my mind, it doesn't seem too difficult; a compatibility layer boots up after bios, which in turn boots to OS1. While in OS1, software is run that triggers a save to ram boots back to the compatability layer, and then boots to OS2. This way, the OS's can be used side by side and boot times are cut drastically short since both OSs are already in ram. Both OS's have their own designated and protected memory so there is no problem there... I mean, it seems fine, but no one has done it, so there must be some reason as to why. I would love some insight into this please.

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• How can I see which applications have accessed a certain file within a given time period on Linux?

  - by Nikolaidis Fotis

  Is it possible on Linux to find out which applications have accessed a certain file in the last 24 hours? I've come with a few possible solutions: Watch lsof. It works, but it's constrained to watch's granularity. inotify sounds good... but no information of the application accessing the file is provided. auditd may be useful, but I haven't checked that yet. What ways can I see which applications have accessed a certain file within a given time period?

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• Can I get my video card to output a DVI and VGA signal at the same time?

  - by Roy Pardee

  Hey All, I've got: a lovely 24" monitor, w/both DVI and VGA inputs, a personal desktop w/a Radeon HD Pro 2400 video card (both DVI and VGA outputs) a work laptop w/both outputs, and a KVM switch that handles VGA only Right now I've got laptop connected to the monitor's VGA, and the desktop connected to the DVI. This works, but requires me to switch the KVM and monitor input sources separately, which annoys me (I switch back & forth a lot to make skype calls & manage my music). I'd like to feed both VGA and DVI signals out of my desktop so I can do quick things on my desktop & switch right back, but then when I'm done working, switch the monitor over to DVI to get the crisper picture. Alas, just attaching both VGA and DVI cables to my desktop's video card did not do the trick. Can this card be persuaded to output both signals at the same time? Many thanks! -Roy

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• How to monitor changes in the frequency of network latency spikes over time?

  - by dequis

  I'm currently trying to troubleshoot an issue with my network in which I get latency spikes up to 200 seconds (normally around 50 secs) in an apparently random way at apparently random moments of the day. While trying to find what part of my messy network needs to be blamed (outside of the scope of this question - discussed a bit on chat), I realized I have no reliable way to confirm that a change actually improved anything. So far, the main way in which i notice this is that irssi shows [Lag: 15 (??)] in the statusbar, increasing every 5 seconds, and all other connections seem to be affected too. Since this depends on my observations, it's not a very reliable method to know how often it really happens. Note that just sending ICMP pings is probably not enough, but that's just my guess. It might be a "bufferbloat" issue, it might be packet loss, it might only apply to persistent connections. I suspect this because a few months ago, when the issue started, I had a "ping" command running in background and it didn't show anything weird at all during the latency spikes. This seems to have changed now (pings don't go through), but still, I'd prefer something more robust.

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• How do I get a chart in LibreOffice Calc to have regular time intervals when the data is not regular?

  - by Dave M G

  I have an area chart in LibreOffice Calc where I would like the X axis to be measured in one month intervals spaced evenly apart. The data going into the graph, however, is not regularly spaced at one month. There can be zero, one, or two entries in any given month. Right now, the chart is keeping the horizontal pacing of the data consistent and adjusting the X axis to accomodate, which is the reverse of what I want. In the example picture below, you can see that there is one data point in March, one in May, and two in June. Along the X axis, April is gone and June is taking up double the space. Instead of this, I'd like the months to stay the same spacing so there is April, May, and June, and for the data area of the chart to compress or extend horiozontally as necessary. I have tried editing the X axis and adjusting the time intervals, but this doesn't seem to do anything. Is what I'm after possible?

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• How can I take a one time full backup of a Windows Server without the need for a restore program?

  - by TheCleaner

  I have a Windows SBS server with about 500GB of data that I'm decommissioning but I'd like to take a final backup of the server and place it on an external USB drive. I already have multiple backups of the server on disk from the past but they are through Simpana Commvault. I'd like a backup that will simply copy the file structure, ACLs, timestamps, etc. as is to a NTFS volume on the external drive. This way if someone says "I need x file on the server you decommed" I can search the external drive real quick instead of firing up Commvault, cataloging, restore, etc. I know the built-in Windows backup is great, I just don't feel like running it for a restore job on this. I'd like an option where in the future it won't require a program to run a restore. Rather a simple mount of the drive will suffice. I believe I can use robocopy just fine, but I'm not sure if it will grab the Windows directory, system files, and full user profiles correctly even with the /ZB option. Options? Is Robocopy /E /ZB /COPYALL /DCOPY:DAT /MT:32 /R:5 /W:5 /LOG:copylog.log the way to go here?

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• Why does my DSL modem now need a reboot each time for my laptop to connect?

  - by msorens

  I have a rather peculiar home networking issue. For sometime my home network was purring along fine. I could turn on either of my laptops and they would quickly find and connect to my DSL modem (and thence the internet). Several days ago I unplugged my DSL modem for the first time in months. Upon turning it back on and waiting for the boot to finish, the lights on the panel indicated the DSL modem was fully operational, just as before. But that's not what happened. Not at all. Now when I turn on my Win7 laptop, the network icon in my system tray shows a small starburst; hovering over it the tooltip states "Not connected; connections are available". Clicking it lists several nearby networks including my own network showing a strong signal. If I click to connect, it attempts a connection but then I get a dialog stating "Windows was unable to connect to MyNet.". Turning off wireless on my laptop and turning it back on yields no difference. Running the network troubleshooter (which includes doing a repair on the network connection) yields no difference. The only remedy is to reboot the DSL modem (i.e. unplug it, wait a few seconds, then plug it back in). As soon as it goes online my laptop finds it and connects properly. To add one more twist to the story, this happened to me once before, several months ago. After a couple weeks, the situation resolved itself(!). Everything started working properly again, due to nothing I did. Final note: this problem only affects the wireless connection to the DSL modem. My desktop computer, connected via hardline to the DSL modem, connects fine when I turn it on. Any thoughts on why this is happening or how to fix it?

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• How to keep time on resumed KVM guest with libvirt?

  - by Hristo Hristov

  On my host I am using libvirt and a KVM guest. When the host is shutting down, libvirt suspends the guest. When the host is starting up, libvirt resumes the guest. The problem is, if the guest is suspended and resumed after 24 hours for example, then the guest time is 24 hours in the past. I thought that maybe the problem is with the clocksource, but it is set to "kvm-clock" already. $ cat /sys/devices/system/clocksource/clocksource0/available_clocksource kvm-clock tsc hpet acpi_pm $ cat /sys/devices/system/clocksource/clocksource0/current_clocksource kvm-clock

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• What would cause previously sent emails to be sent again from Exchange the first time someone logs i

  - by Ken Pespisa

  A few users testing our Citrix XenApp service found that several (seemingly random) previously sent emails were sent out immediately after they logged into Outlook via Citrix for the first time. The problem hasn't occurred for them since. After one user had this happen, and we scratched our heads about it thinking it was a fluke, our IT director had this same issue. I guess I'd rule out any PEBKAC issues. I really don't know where to begin troubleshooting this problem. If you have any ideas what could have caused this, I'd appreciate you sharing them, as strange or far-fetched as they may seem :)

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• How can I to take an HDMI TV broadcast and overlay text in real time?

  - by ObligatoryMoniker

  Our company wants to be able to have LCD TVs displaying TV with the ability to add an overlay, like a stock ticker at the bottom of the screen, where human resources can add content to be displayed. I have been trying to nail down the correct terminology for this and come across terms like Keying, Compositing, Live Broadcast Graphics Presentation, and Hardware Overlay but I don't know which of these terms is truly the correct way to refer to what I am trying to do. Black Magic offers a product that seems like it can do what I am looking for but their product seems like it is geared for a totally different purpose than what I would be using it for. Compix also seems to have a product that would do what I need but again it seems like killing a fly with a sledge hammer. How can I to take an HDMI TV broadcast and overlay arbitrary content in real time?

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• How can I make a VB script execute every time Windows starts up?

  - by jon

  My goal is to copy INI.file each time Windows XP is started up or rebooted. The following VB script copies INI.file from a local directory to C:\INI_DIR. I tried to copy the VB script to C:\WINDOWS\system32\config\systemprofile\Start Menu\Programs\Startup, but it doesn't get activated. Is it not the right path? How can I make it execute on startup/reboot? The script: Dim currDir Const OverwriteExisting = True Set fso = CreateObject("Scripting.FileSystemObject") currDir = fso.GetParentFolderName(Wscript.ScriptFullName) Set objFSO = CreateObject("Scripting.FileSystemObject") objFSO.CopyFile currDir & "\INI.file" , "C:\INI_DIR" , OverwriteExisting ' Release the objFSO objects Set objFSO = Nothing ' Release the fso objects Set fso = Nothing

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• Is it bad to put your computer in sleep mode every time? [closed]

  - by Ivo Flipse

  Possible Duplicate: What is the effect of always sleeping a laptop? Is it bad for batteries or something else? Often I have a lot of stuff open and don't feel like shutting down my laptop, so I just use sleep mode when I'm transferring it. But I have no idea if this might have any disadvantages. So my question is: is it bad to put your computer in sleep mode every time? Things I'm wondering: Should I turn off my computer every once in a while? Will continuous use of sleep mode slow down my system in any way? Are there any bad side effects (in the long term)? Any thoughts? FYI I'm using Windows 7 on a laptop

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• WOL doesn't work if set to anything other than `a` but this setting makes it boot all the time

  - by Elton Carvalho

  I manage a small "cluster" of 4 Xeon machines with Intel boards in my lab. They are all plugged to a 5-port 3-Com switch with static IP addresses like 10.0.0.x. They are all running OpenSuse 11.4 and their /home/ is served by one of the machines (node00) via NFS. They are plugged to an UPS that can keep them on for ca. 15 minutes, but there are lots of electric shortages due to "unscheduled maintenace" that are longer than this. So they end up being powered down without notice. If I set the BIOS to turn them on after power shortages, the issue is that they all boot at the same time and, if node00 decides to run fsck in the /home/ partition, it does not finish booting before the others try to NFS mount their /home/. I am trying to make wake on lan work, so I can choose to boot the NFS clients only after the server has successfully booted. The problem is that when I run ethtool I get an output like this: Supports Wake-on: pumbag Wake-on: g Theoretically, it is set to wake on MagicPacket(tm), according to the manual. But sending the WOL packet using wol -i 10.0.0.255 $MACADDR does not wake up the box after I shut it down with halt. The ethernet link led blinks after I send the packet, so it appears to be getting to the machine. However, if I set it up with ethtool -s eth1 wol bag, the machine always wakes up right after halting, even if I don't send the Magic packet. This means that the device can wake up with LAN activity, but seems to be ignoring the magic packet. Setting wol ag does not wake the box with the MagicPacket. Does setting wol a mean that it should boot with any broadcast message? How can I diagnose the issue of the machine not waking up with the MagicPacket even though I am sending it and it's set up to wake up with it? Thanks in advance!

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• Ubuntu networking issue: two specific machines cannot browse web while connected to network at the same time.

  - by jensendarren

  I have setup a secure wireless network which works very well except for two laptops running Ubuntu 10.10 that can't access the Internet via a browser at the same time. They can both ping sites, wget sites, use skype but when using a browser the page never loads (in Firefox the status bar just sits there saying "Connecting" until it times out.) Here is what we have tried so far (nothing has fixed this issue): OpenDNS Restart networking services Using wired connection rather than wireless Removing all other nodes from the network except the two machines that have this issue Swapped out the router Factory reset the router Reformatted one of the machines and re-installed Ubuntu 10.10 Other things that we have checked: The two machines can connect simultaneously without any issues to other wireless networks in different locations (say in an Internet Cafe or another office) The two machines have unique IP addresses The two machines have unique MAC addresses The two machines can communicate on the network using Skype, wget, ping etc We are not using a proxy on either machine FYI: I have attached output from wireshark. For the test we turned both machines on and pointed them both to the same website. The content loaded on one and not the other. Here is the output from wireshark- (speedyshare.com/files/26228631/machine_output_1 && speedyshare.com/files/26228649/machine2). As you can see the first one worked, the second one didn't. I don't fully understand the output and would appreciate if someone could shed some light on what might be causing this and how we can fix it! Many thanks! Darren

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• Why does m4 error "linux-gnu.m4 - No such file or directory" appear the first time after updating sendmail.mc?

  - by Mike B

  SendMail 8.14.x | CentOS 5.x I've noticed that if I manually update /etc/mail/sendmail.mc (for example, enable TLS support), and then bounce sendmail, I get the following error: Shutting down sm-client: [ OK ] Shutting down sendmail: [ OK ] Starting sendmail: sendmail.mc:18: m4: cannot open `/usr/share/sendmail-cf/ostype/linux-gnu.mf': No such file or directory [ OK ] Starting sm-client: [ OK ] This only happens one time after I update a sendmail.mc file. If I bounce sendmail again (without making any other change), I don't see the error any more. Any idea why this happens? It doesn't cause any errors - I'm just curious.

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• SSL Certificate Expiry: Does the expiry time make any difference at all?

  - by CYMR0

  I need to know when an SSL certificate actually expires. Does it just look at the expiry date, or does it also take into account the expiry time? Let's say a certificate expired on 1/1/2013 at 11am. Does that certificate expire at 11:01am or is it only the following day that the certificate expires? I have been told both are true. Hope that makes sense! Our suppliers messed up and let our certificate expire, and I'm trying to figure out how much compensation we're owed. I found this question Details on exact expiration datetime of an SSL certificate? but it didn't quite answer what I need (and I didn't like to revive a dead question).

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• How can I perform a ping every X minuts and check the response time?

  - by Profete162

  I am currently working in a big company and we have serious latency issues. This is happening in a process control system, and is unacceptable (Open a valve sometimes take 2 minuts before command start) The Network team seems very lazy and I want to check when they say "everything alright on the network". So, I want to create a loop that ping the server and write the result in a text file. I am not a batch expert, but do you think this code is correct to use? @ECHO OFF :LOOPSTART time /T ping xxx.xx.x.x -t >> filename.txt sleep -m 3000 GOTO LOOPSTART

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• Does migrating 2 domain controllers between 2 datacentre requires both virtual machines to be shut down at the same time?

  - by Imagineer

  I was attempting to migrate 2 virtual machines that are domain controllers between 2 datacentres running ESX 3.5 and ESX 4.1. I was advised to shut down both domain controller at the same time during the migration process. This is to avoid USN Rollback and other replication issues. The following are the steps that I was planning to perform: 1. Shutdown both DC. 2. Copy both VMs files across to new datacentre using Veeam FastSCP (connection to both vCentre through IP address instead of hostname) 3. Power them up at new datacentre. 4. Configure Network interface/DNS/DHCP for both DCs in new datacentre I have tried to use Veeam FastSCP rather than VMware Standalone Converter is because its copying rather than converting. Someone also suggested that I use backup and restore app like Veeam backup and replication software. Sounds like a simple job, but after shutting down both DCs, the transfer rate using FastSCP is so slow registering only 1KB/s as oppose to the normal 1MB/s (or more). When that attempt to transfer failed, I tried to cold clone both DCs resulted in the both ESX hosts get disconnected. I have tried troubleshooting by referring to this - VMware KB - Diagnosing an ESX Server that is Disconnected or Not Responding in VirtualCenter It seems that the DNS being down is the caused of all unusual occurrence. The moment I powered up the DCs via VMware console command, the ESX host were able to connect to the vCentre again. How can I avoid such a pitfall again? Am I doing it correctly? Any help would be greatly appreciated! Thank you.

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• How can I run 2 already installed OS at the same time?

  - by eran

  I have Win7 and Ubuntu installed on my PC, and I can choose which to run at boot time. I would like to be able to run the Ubuntu from within the Win7. Tools like VMWare allows one to create a new installation of a guest OS, which could then be run alongside the hosting OS. However, I already have the Ubuntu fully installed on my hard drive, and I'd like to maintain the dual boot option. Ideally, I'd like to be able to create a new virtual machine on my Win7, but instead of installing a new guest OS, just direct it to the existing installation. Is that possible?

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