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  • Amazon EC2 performance vs desktop

    - by flashnik
    I'm wondering how to compare performance of EC2 instances with standard dedicated servers and desktop. I've found only comparance of defferent clouds. I need to find a solution to perform some computations which require CPU and memory (disc IO is not used). The choice is to use: EC2 (High-CPU) or Xeon 5620/5630 with DDR3 or Core i7-960/980 with DDR3 Can anybody help, how to compare their performance? I'm not speaking about reliability of alternatives, I want to understand pros and cons from the point of just performance.

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  • KVM Guest installed from console. But how to get to the guest's console?

    - by badbishop
    I'm trying to install a fully virtualized guest (Fedora 14 x86_64) on KVM (RHEL 6), using command-line only (both hypervisor and guest). It goes without errors, and without a tangible result . I'd like to know how to do a text-only installation. So, here's what I've done: # virt-install \ --name=FE --ram=756 --vcpus=1 \ --file=/var/lib/libvirt/images/FE.img --network bridge:br0 \ --nographics --os-type=linux \ --extra-args='console=tty0' -v \ --cdrom=/media/usb/Fedora-14-x86_64-Live-Desktop.iso Starting install... Creating domain... | 0 B 00:00 Connected to domain FE Escape character is ^] ÿ Now what? As I understand after googling for a couple of days, I should see the guest's output from the text installation, but nothing happens. virt-viewer cannot connect to it, kindly suggesting that I explore all the options by adding --help (which I did). If I reconnect with virsh, I see this: Domain installation still in progress. You can reconnect to the console to complete the installation process. [root@v ~] # virsh console FEConnected to domain FE Escape character is ^] This shows that VM is running # virsh list Id Name State ---------------------------------- 8 FE running Qemu log: LC_ALL=C PATH=/sbin:/usr/sbin:/bin:/usr/bin /usr/libexec/qemu-kvm -S -M rhel6.0.0 -enable-kvm -m 756 -smp 1,sockets=1,cores=1,threads=1 -name FE -uuid 6989d008-7c89-424c-d2d3-f41235c57a18 -nographic -nodefconfig -nodefaults -chardev socket,id=monitor,path=/var/lib/libvirt/qemu/FE.monitor,server,nowait -mon chardev=monitor,mode=control -rtc base=utc -no-reboot -boot d -drive file=/var/lib/libvirt/images/FE.img,if=none,id=drive-ide0-0-0,format=raw,cache=none -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -drive file=/media/usb/Fedora-14-x86_64-Live-Desktop.iso,if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -netdev tap,fd=20,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:0a:65:8d,bus=pci.0,addr=0x2 -chardev pty,id=serial0 -device isa-serial,chardev=serial0 -usb -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3 char device redirected to /dev/pts/1 Output of /etc/libvirt/qemu/FE.xml # cat /etc/libvirt/qemu/FE.xml <domain type='kvm'> <name>FE</name> <uuid>6989d008-7c89-424c-d2d3-f41235c57a18</uuid> <memory>774144</memory> <currentMemory>774144</currentMemory> <vcpu>1</vcpu> <os> <type arch='x86_64' machine='rhel6.0.0'>hvm</type> <boot dev='hd'/> </os> <features> <acpi/> <apic/> <pae/> </features> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <devices> <emulator>/usr/libexec/qemu-kvm</emulator> <disk type='file' device='disk'> <driver name='qemu' type='raw' cache='none'/> <source file='/var/lib/libvirt/images/FE.img'/> <target dev='hda' bus='ide'/> <address type='drive' controller='0' bus='0' unit='0'/> </disk> <disk type='block' device='cdrom'> <driver name='qemu' type='raw'/> <target dev='hdc' bus='ide'/> <readonly/> <address type='drive' controller='0' bus='1' unit='0'/> </disk> <controller type='ide' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> </controller> <interface type='bridge'> <mac address='52:54:00:0a:65:8d'/> <source bridge='br0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </interface> <serial type='pty'> <target port='0'/> </serial> <console type='pty'> <target port='0'/> </console> <memballoon model='virtio'> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </memballoon> </devices> </domain> I'm obviously missing something that many others don't, but what is it? Thanx in advance!

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  • How to read the statistics in Media Player Classic?

    - by netvope
    I understand that the two numbers under bitrate are the average bitrate and the current bitrate of the stream. But what are the two numbers under buffers? I suppose the second one is the amount of data loaded in memory, but what is the first number? The amount of data decoded? Also, why are there a jitter and a sync offset? (For your reference, here stream 0-6 are video, audio track 1, audio track 2, subtitle track 1 and subtitle track 2.)

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  • write-through RAM disk, or massive caching of file system?

    - by Will
    I have a program that is very heavily hitting the file system, reading and writing randomly to a set of working files. The files total several gigabytes in size, but I can spare the RAM to keep them all mostly in memory. The machines this program runs on are typically Ubuntu Linux boxes. Is there a way to configure the file system to have a very very large cache, and even to cache writes so they hit the disk later? I understand the issues with power loss or such, and am prepared to accept that. Crashing aside, in normal operation the writes should eventually reach the disk! Or is there a way to create a RAM disk that writes-through to real disk?

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  • My Mac is slow but don't know what's slowing it down

    - by duality_
    My Mac (Macbook Pro) is sometimes slow doing basic tasks, like browsing the web or something like that. If I open Activity Monitor, I have (maybe) one program that is about 10 % CPU, others are below 1 %. My CPU usage is not full. I still have more than 2 GB of free memory (out of 5 GB). There is no heavy I/O activity like copying files. My open programs are Google Chrome (6 tabs, none of which are in some way (flash, many DOM objects, Javascript) have IMO, except maybe Gmail), Activity Monitor, Finder, Sublime Text 2 (text editor) and iTerm (terminal). What is causing the slowdown? "Slow" being: taking time to write these characters (I press the keyboard keys but there is a delay before I see them on the screen), changing tabs or programs, etc.

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  • Improve performance of bind9 service restart

    - by Jakob
    Hi, I'm setting up a name server hosting DNS for a large number of domains, 50,000 - 100,000 domains. I will be using Bind9 and the service will need to be restarted several times a day. I have made some tests and it seems that restart of the Bind9 service scales very poorly with the number of domains. #domains | restart time ----------------------- 10,000 | 3.1 sec 25,000 | 8.9 sec 50,000 | 50 sec 100,000 | 7:50 min Is there some way to speedup the restart of the service? I have noticed that restart only utilizes one core, is there some way for it to use more cores? The Bind9 version is 9.7.1-P2 with default configuration. The server running Bind9 is a Intel Core 2 Due 2.93 GHz with 4 GB memory and Ubuntu Server 10.10. Any help will be appreciated. Jakob

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  • Firefox in popup window (no address search bar) ctrl-k navigates to google

    - by Greg
    In firefox hitting Ctrl+K takes you to the search bar (all fine and good). However in my webmail client (Zimbra) it pops open windows without the address/search bar. Hitting Ctrl+K there (muscle memory from Outlook Web Access) navigates immediately to google.com - hitting back doesn't work from there (Zimbra's all screwed). Is there anyway to disable Ctrl+K navigating to the search provider without changing the normal Ctrl+K to the search-bar behaviour when the search-bar is present? Or better yet force it to actually pop up the search-bar - or highlight in my main browser window's search bar?

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  • How to diagnose repeated freezing of windows 7 (comes back alive in few seconds)

    - by Akash Kava
    I installed Windows 7 in a 3 year old machine, it installed successfully, took all drivers and running great, but what happens is every 5-6 minutes it freezes for few seconds... 30 seconds to 1 minute and then comes back alive. I checked Event Viewer, nothing matching the frozen timeline. I would appriciate any help on how to detect causing service/hardware. After it comes alive, everything runs normal, I did run task manager and checked cpu usage, at time it freezes just before and after that no task took more cpu or memory, it was like idle machine. No external usb drives or no devices, on board intel desktop board with SATA HDD, SATA hdd running in absolute good mode.

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  • Slowdown after repeated hibernation in XP SP3

    - by John
    I have a Dell laptop w/dual core and 4 gigs of memory. Recently my machine has started to go off in never never land for 5 to 20 minutes at a time with a lot of hard drive churning. Eventually it comes back and everything operates properly. If I manage to have task manager up CPU usage shows no more then 3 to 5% during this process. I am on a corporate network and have very good virus protection in place. The problem seems to have increased in frequency since I let an update happen to IE8 and/or I started using hibernate more frequently. Any ideas or suggestions? TIA J

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  • magento on Zend Server (Win7) installation error

    - by czerasz
    I try to install magento for the first time. I've created the database with the name "project" in my C:\Zend\Apache2\conf\httpd.conf I added on the end: <Directory "C:\Zend\Apche2\htdocs\project"> Options Indexes FollowSymLinks AllowOverride All Order allow,deny Allow from all </Directory> in my ZendServer/Server Setup/Extensions: PDO_MySQL, simplexml, mcrypt, hash, GD, DOM, iconv, curl, SOAP are on in C:\Zend\ZendServer\etc\php.ini I set: safe_mode = Off ;<-- was set to off ... memory_limit = 512M; Maximum amount of memory a script may consume (128MB) After step "Configuration" of magento installation (with Use Web Server (Apache) Rewrites enabled) I get: Internal Server Error My database is full of tables (that schould be ok) My Zend Server shows: 27-Oct 06:55 6 Severe Slow Request Execution (Absolute) http://localhost/project/index.php/install/wizard/installDb/ Critical Open 27-Oct 06:55 4 Fatal PHP Error C:\Zend\Apache2\htdocs\project\lib\Varien\Db\Adapter\Pdo\Mysql.php Critical Open 27-Oct 06:55 5 Slow Function Execution curl_exec Warning Open 27-Oct 06:55 5 Slow Request Execution (Absolute) http://localhost/project/index.php/install/wizard/configPost/ What can be wrong?

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  • Tor Browser: how do I restart just the browser?

    - by GDR
    I'm using Tor Browser on Linux from time to time, but I close the browser because it has high memory usage, and leave Vidala running in background to help the network and relay traffic. The problem is, when I want to use Tor Browser again, I have to shut down Vidala and start it again. This takes time and has negative effect on the network. When I execute ./App/Firefox/firefox-bin, the browser starts but says it's not connected via Tor network. Any ideas how to start tor browser and make it connect to existing Vidala instance?

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  • Alternatives for heapdumps creation with higher performance than jmap?

    - by Christian
    Hi, I have to create heapdumps, which works nice with jmap. My problem is, that jmap takes very long to create the heapdump file. Especially when the heap is getting bigger ( 1GB) it is taking too long. One situation as example: When the server gets into trouble with the heapspace, I want to restart it automatically and create a heapdump before the restart. This works, but takes too long to write the heapdump. This way the server is down for too long. The heapdump creation takes longer than one hour. I know about -XX:+HeapDumpOnOutOfMemoryError, but most of the time I can find the memory problem before the exception is thrown by the jvm. Is there an alternative to jmap which writes the heapdumps faster? A special solution for the example above would also be appreciated. This question is a mix between programming and system-administration, but I think I'm at the right place here.

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  • SQL Server 2008 No process is on the other end of the pipe

    - by Matt
    I've recently been having some issues with SQL Server 2008 on our server. We only have one website running at the moment, but it seems at random that the following error occurs. A connection was successfully established with the server, but then an error occurred during the pre-login handshake. (provider: Shared Memory Provider, error: 0 - No process is on the other end of the pipe.) I don't understand this error, or what's causing it. Any help would be appreciated. When this error does occur all it takes to fix it is to restart the MSSQLSERVER service. But I need to fix the underlying problem first.

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  • Best SQL Server Configuration with this hardware.

    - by DavidStein
    I just received my new SQL Server from Dell. The server will be serve approximately 15 OLTP databases which average 10GB in size. Here are the basic specs: Dell PowerEdge R510 with up to 12 Hot Swap HDDs,LED Intel Xeon E5649 2.53GHz, 12M Cache, 5.86 GT/s QPI, 6 core (Quantity of 2) 48GB Memory (6x8GB), 1333MHz Dual Ranked RDIMMs for 2 Processors, Optimized PERC H700 Integrated RAID Controller, 1GB NV Cache 300GB 15K RPM SA SCSI 6Gbps 3.5in Hotplug Hard Drive (Quantity of 4) 600GB 15K RPM SA SCSI 6Gbps 3.5in Hotplug Hard Drive (Quantity of 6) My first thought was to use 3 arrays. OS - Raid 1 - (2)300GB T-Log - Raid 1 (2)300GB DB - Raid 5 (5) 600GB Backup - (1) 600GB - non-raided. However, I could also do the following after purchasing one more drive for backup. OS and T-Log - Raid 10 - (4)300GB DB - Raid 10 (6)600GB The hard drive space is not an issue as the databases are not that large. I'm just trying to optimize the speed of the applications using these databases. So, what would you guys recommend?

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  • Drobo not mounting. Disk repair doesn't work either.

    - by kohei
    Hi, While transferring data to my 2nd gen Drobo power went out. Now my Drobo is not mounting to my OS X 10.6.3 I have tried Disk Repair and this error message appears: Verify and Repair volume “disk1s2” Checking Journaled HFS Plus volume. Invalid key length Invalid record count Catalog file entry not found for extent The volume could not be verified completely. Volume repair complete.Updating boot support partitions for the volume as required.Error: Disk Utility can’t repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files. I tried DiskWarrior too but it doesn't work either. It gives me that I need more memory to continue and software shuts down. Any one know solution to this one?

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  • Why is Latex so big?

    - by putmatrix
    On windows, MikTex comes in a DVD. It's several times bigger than a typical Linux distribution. This makes it impossible to carry Latex on a memory stick like I do with many other useful software. Why is it so big? I thought it was just a language or system, but I've never seen any programming language with gigabytes of libraries. It's just that there's a bad feeling when your Latex distribution takes up four gigabytes of space when you expect it to be more of, say, 200mb.

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  • STS 2.5.2 showing error error occurred during initialization of vm could not reserve enough space for object heap eclipse

    - by user1460079
    I am using STS2.5.5 with jdk 1.6 in my system with 32 BIT winx Xp it was working fine for few HRs when i installed it for the first time, after that when i restart STS it started showing exception Failed Initialize when i start the TC it throws hte exception error occurred during initialization of vm could not reserve enough space for object heap eclipse It is working fine in another system with same config, to resolve this if i delete STS and reinstall STS it works fine but again throws same error if i close STS and open it can anybody help me, i am also not able to change the size in my sts.ini if i increase memory and start STS then it will not start.

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  • How do TAB & SHIFT-TAB get reversed in Entourage?

    - by Daryl Spitzer
    In Microsoft Entourage, I can use Tab to move the highlighted selection from "Inbox" in the left-hand column: ...to the list of email in my inbox: And Shift-Tab returns the selection to the left-hand column again. But once-in-a-while when I return to Entourage (but never immediately after launching it), Tab and Shift-Tab are reversed. That is, I need to use Shift-Tab to move the highlighted selection to the list of email and Tab to return the selection to the left-hand column. I don't know what causes this, and I find it so annoying that I'll restart Entourage just to restore Tab and Shift-Tab to what my muscle-memory expects. What is causing them to get reversed, and can I un-reverse them without restarting Entourage?

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  • Upgrading Windows 8 Consumer Preview to Release Preview

    - by user1407016
    I currently have my main hard drive split into two partitions. One being Windows 7 with about 600 GB of memory, the other Windows 8 Consumer Preview with about 50 GB. As you can guess it is set up for a dual boot. Today while looking up how to get the C# Facebook SDK for Metro apps I learned about the Release Preview being released. I was wondering: How do I go about getting rid of Windows 8 Consumer Preview and replacing it with the Release Preview? I know i can't just wipe it off my second partition because the dual boot uses Windows 8 to choose the operating system to boot.

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  • How to configure nginx to serve static contents from RAM?

    - by Vijayendra Tripathi
    I want to set up nginx as my web server. I want to have image files cached in the memory (RAM) rather then disk. I am serving a small page and want few images always served from RAM. I dont wish to use varnish (or any other such tools) for this as I believe nginx has a capability to cache contents into RAM. I am not sure as how may I configure nginx for this? I did try few combinations but they didn't work. nginx uses disk all the time to get images. For example, when I tried apache benchmark to test with following command - ab -c 500 -n 1000 http://localhost/banner.jpg I get following error - socket: Too many open files (24) I guess this means nginx is trying to open to many files simultaneously from the disk and OS is not allowing this operation. Can anyone please suggest me a correct configuration? Thanks for considering this message.

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  • Sudo yum seems to fail on CentOS, but works fine after sudo -i

    - by Aron Rotteveel
    I am currently having some trouble with yum through sudo. For some reason, it does not seem to work: aron@graviton [/var/log]# sudo yum clean all There was a problem importing one of the Python modules required to run yum. The error leading to this problem was: /usr/lib64/python2.4/lib-dynload/datetime.so: failed to map segment from shared object: Cannot allocate memory Please install a package which provides this module, or verify that the module is installed correctly. It's possible that the above module doesn't match the current version of Python, which is: 2.4.3 (#1, Sep 3 2009, 15:37:37) [GCC 4.1.2 20080704 (Red Hat 4.1.2-46)] If you cannot solve this problem yourself, please go to the yum faq at: http://wiki.linux.duke.edu/YumFaq The strange thing, however, is that it works fine when I gain root privileges through sudo -i first. Any ideas what might be causing this problem?

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  • How to reliably take Java Heap Dumps?

    - by karlcyr
    My team is running into difficulties when trying to take good heap dumps triggered by OutOfMemoryErrors. For specific reasons we are currently taking the dumps with jmap called from a bash script instead of using the HeapDumpOnOutOfMemoryError flag. We're using a 64-bit 1.6 JVM with a heap size around 3 GB. Our heap dumps fail 90% of the time (guesstimate). Is there anything we can do to improve our odds of getting a clean heap dump we can use to troubleshoot memory problems? I have read that jmap had major issues in Java 1.4 but that those issues should be mostly addressed now.

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  • HP Probook 4530s great specs, but lagging. Hard Drive?

    - by Mark
    I have this laptop, which has a i3 processor, 4gb memory, 7200rpm hard drive. So there is nothing wrong with the specs. Even when I have no applications open, simply closing and opening windows, lags. Or opening the start menu, or dragging icons across the desktop. sometimes even the cursor lags. So I checked out the resource monitor, and the resources using disk activity are svchost Avast ------- my antivirus, but not much System (PID 4) ------ This is using a huge chunk The total disk activity fluctuates between %50 - %100

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  • PXE Boot PCLinuxOS ISO

    - by DBNotCooper
    I'm in the process of trying to convert some computers at my local school to be diskless browser stations. We've identified PCLinuxOS as the OS we'd like to use due to it's easy interface for creating custom ISO images (we need WINE and some custom apps installed also, as well as FireFox). I've been having problems figuring out how to get an ISO to boot via PXE. In our network, I only have access to TFTP and HTTP, so I cannot use NFS. The machines all have enough memory (4 gigs) that they could use a ram drive to hold the ISO image, if that helps. Currently I've been looking at GPXE with GRUB/MEMDISK, but I don't know if that's the right solution, or even where a good resource is for setting it up. Searching the web has proved fruitless, as most of the information is either NFS-specific or out of date. The other students and I would appreciate any help! :)

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  • Strange IIS/Asp.net Exception Message

    - by Element
    I have a standard asp.net 2.0 application running on IIS 6. I have noticed some strange exception messages in the logs. They seem to be caused by random spam bots trying to submit forms. They are strange because the request string is huge and all the exception details in the event manager are messed up, they have been replaced with %21,%22, etc.. as seen in the screen shot. Is this some kind of exploit or just a bug in the asp.net exception handler/logger ? UPDATE: I traced the requests that are causing this strange log event to a bug in IE8 that causes it to request scriptresource.axd?d={html from page} as described in these links: MS Connect SO - Invalid Webresource.axd SO - IE8 Dropping Memory Pages I am still not sure why these requests would break the IIS log event like seen above, they are just long strings of jiberish being sent to the server, maybe someone reading this can shed some light on it.

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