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  • Cooperative linux vs vm

    - by Rhythmic Algorithm
    What are the advantages / disadvantages of using cooperative linux like portable ubuntu for example compared to a qemu or any other virtual machine installation. Is one option notably faster than the other plus and other things that should be taken into consideration.

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  • When to use a RAM-Disk?

    - by Ice
    Hi, I know that RAM-Disk are fast, faster than any Disk but they lose their contents on a shutdown of the operating system. The capacity is limited to the RAM. Is there a usefull implementation on a new 64-Bit windows 2008 server? Peace Ice

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  • Can I burn a CD ISO to DVD?

    - by Peter Turner
    Well, I just figured I'd ask because this site is so awesome that it probably is faster to ask than try it and waste a few cents. So can I burn an CD ISO to DVD? We've just got a bunch of DVD-R's lying around and I don't want to bother with torrents to download the new Fedora DVD.

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  • Monitor and copy file changes on Windows Server 2003 over NFS or CIFS to *nix

    - by davenolan
    Machine A, Windows Server 2003. Machine B, Ubuntu 9.04. Aim is to copy new and updated files as fast as possible from A to B. B can mount A either as CIFS or NFS (Services for Unix NFS server running on A). This is an absolutely time critical operation. What is the best way of achieving this? Note: benchmarked NFS vs CIFS and CIFS was faster and there was less variance in the speed (haven't tuned the NFS setup at all)

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  • few questions on packet sniffer/analyzer

    - by user37652
    I have few questions about packet sniffer. I'm using a zyxel p-600 series modem and a hub to distribute the internet connection. Can I use a packet sniffer here to determine if the user is downloading something? Can I determine if the user is downloading a file based on the modem alone.(The lights blink faster) Is there an application that I could use for the modem or the hub to limit or avoid direct downloads. Details: OS: Ubuntu 9.10 and Windows 7

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  • sudo taking long time

    - by Sam
    On a Ubuntu 9 64bit Linux machine, sudo takes longer time to start. "sudo echo hi" takes 2-3 minutes. strace on sudo tells poll("/etc/pam.d/system-auth", POLLIN) timesout after 5 seconds and there are multiple calls(may be a loop) to same system call (which causes 2-3min delay). Any idea why sudo has to wait for /etc/pam.d/system-auth? Any tunable to make sudo to timeout faster? Thanks Samuel

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  • Software or testing pipeline for testing multiple hard drives

    - by lions_leash
    I have a whole bunch of hard drives (maybe 10 or so) from a variety of sources that I'd like to test. If they work, I will put them in use and/or give them away. I was going to simply open up one of my machines and plug each one in, one at a time, and troubleshoot from there. Is there a way (or set of tools) that I can use to make this process easier and/or faster?

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  • Can computer crashes and reboots mean weak power supply?

    - by TomA
    Recently I replaced the videocard in my PC for a newer, faster one. All games work perfectly but I get random system crashes and reboots. This happens even when the system is almost idle (browsing, playing music). It never happened with the old card. All drivers are up-to-date. Is it possible that the power supply is not powerful enough for the new card?

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  • Will using FAT32 provide better pagefile performance than NTFS?

    - by llazzaro
    Hello, I was discussing with my others personalities, and came up with a conflict. In http://technet.microsoft.com/en-us/library/cc938440.aspx , says that FAT32 is faster when using smaller volumes. Ok separate disk, will give more performance than same disk. But did anyone test this? Scenario 1 : Separate hard disk FAT32 (small volume) Scenario 2 : Separate hard disk NTFS which one will win? minimum gain?

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  • Setting a Preferred Network Adapter for browsing

    - by ala
    My PC at work is connected to 2 networks; LAN: local corporate network for remote desktop access and very slow internet connection WAN: wireless faster internet browsing Is there a way to setup the default/preferred network adapter for the internet browsing?

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  • Maximum speed of data transmission

    - by JavaRocky
    All major data carriers these days use fiber optic links these days. And data transmission occurs at the speed of light, is that correct? If data transmission does indeed occur at the speed of light, is it also correct to assume that data transmission will never ever be faster?

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  • Advantages of a 130W vs 90W ac adapter?

    - by David
    I purchased a Lenovo T420S laptop with a 90W/20V AC adapter P/N 42t4426 through my IT department. Subsequently, I ordered a replacement adapter and received a 135W/20V AC adapter P/N 45N0054. The 135W version is about twice as big and heavy as the 90W version. Is there an advantage to the 135W version like faster battery recharging? Are there any negative effects (other than weight), like reduced battery life?

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  • Exchange 2010: Possible to close for incomming mails for specific acount and reply with "no longer a

    - by Mestika
    Hi, I was wondering if it is possible, in Exchange server 2010, to disable a mailbox account, lets call it mailuser and if anyone sends a E-mail for [email protected] then it will send a mail back with some sort of standard "This E-mail is no longer in use. Please write to [email protected] instead" mail. I know I can create an "out-of-office" reply from the users outlook, but it would be so much faster to do it within the exchange server. Sincerely Mestika

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  • Is there an easy way to mass-transfer all files between two computers?

    - by Raven Dreamer
    I'm currently visiting my parents for the Christmas holidays, and as I'm sure is the case of many in the post-tech generation, my arrival brings with it the assumption of personal tech support. I've been tasked with setting up my folks' new computer, and they want to make sure all their files, yes, all their files, get transfered over to the new device. Short of manually dragging each folder in the C:/ directory onto an external hard drive and then out onto the recipient computer, is there an easier / faster way to do this?

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  • Free memory on linux [closed]

    - by Julia Roberts
    Possible Duplicate: Meaning of the buffers/cache line in the output of free What would be a good setting to free memory on linux? I have 8GB but gets used up so fast. current settings: kernel.sched_min_granularity_ns = 10000000 kernel.sched_wakeup_granularity_ns = 15000000 vm.dirty_ratio = 40 kernel.pid_max = 4096 vm.bdflush = 100 1200 128 512 15 5000 500 1884 2 What settings would I need so linux frees old ram faster?

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  • Google Chrome as alternative to Firefox.

    - by jack.spicer
    I have been using Firefox for long time. Recently i had switched to chrome to find that its much faster than Firefox, but addons like greasemonkey, adblock plus, tweeterfox etc. keeps me wanting to use Firefox. Now I am confused between which of the two to use. Can someone provide some advice on how to be as productive in Chrome as when using FireFox?

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  • linux + find word/string in file under directory

    - by yael
    I have the following command find /var -type f -exec grep "param1" {} \; -print With this command I can find the param1 string in any file under /var but the time that it take for this is very long -? I need other possibility to find string in file but much more faster then my example THX yael

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  • Linux per-process resource limits - a deep Red Hat Mystery

    - by BobBanana
    I have my own multithreaded C program which scales in speed smoothly with the number of CPU cores.. I can run it with 1, 2, 3, etc threads and get linear speedup.. up to about 5.5x speed on a 6-core CPU on a Ubuntu Linux box. I had an opportunity to run the program on a very high end Sunfire x4450 with 4 quad-core Xeon processors, running Red Hat Enterprise Linux. I was eagerly anticipating seeing how fast the 16 cores could run my program with 16 threads.. But it runs at the same speed as just TWO threads! Much hair-pulling and debugging later, I see that my program really is creating all the threads, they really are running simultaneously, but the threads themselves are slower than they should be. 2 threads runs about 1.7x faster than 1, but 3, 4, 8, 10, 16 threads all run at just net 1.9x! I can see all the threads are running (not stalled or sleeping), they're just slow. To check that the HARDWARE wasn't at fault, I ran SIXTEEN copies of my program independently, simultaneously. They all ran at full speed. There really are 16 cores and they really do run at full speed and there really is enough RAM (in fact this machine has 64GB, and I only use 1GB per process). So, my question is if there's some OPERATING SYSTEM explanation, perhaps some per-process resource limit which automatically scales back thread scheduling to keep one process from hogging the machine. Clues are: My program does not access the disk or network. It's CPU limited. Its speed scales linearly on a single CPU box in Ubuntu Linux with a hexacore i7 for 1-6 threads. 6 threads is effectively 6x speedup. My program never runs faster than 2x speedup on this 16 core Sunfire Xeon box, for any number of threads from 2-16. Running 16 copies of my program single threaded runs perfectly, all 16 running at once at full speed. top shows 1600% of CPUs allocated. /proc/cpuinfo shows all 16 cores running at full 2.9GHz speed (not low frequency idle speed of 1.6GHz) There's 48GB of RAM free, it is not swapping. What's happening? Is there some process CPU limit policy? How could I measure it if so? What else could explain this behavior? Thanks for your ideas to solve this, the Great Xeon Slowdown Mystery of 2010!

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