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• Is virtual machine slower than the underlying physical machine?

  - by Michal Illich

  This question is quite general, but most specifically I'm interested in knowing if virtual machine running Ubuntu Enterprise Cloud will be any slower than the same physical machine without any virtualization. How much (1%, 5%, 10%)? Did anyone measure performance difference of web server or db server (virtual VS physical)? If it depends on configuration, let's imagine two quad core processors, 12 GB of memory and a bunch of SSD disks, running 64-bit ubuntu enterprise server. On top of that, just 1 virtual machine allowed to use all resources available.

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• What is the best way to configure the number of workers in Apache?

  - by rbm

  My site receives a lot of traffic for 2 hours during the day (2000 hits per minute). The rest of the day receives less traffic(500e hits per minute). I have been experimenting with the MaxClients and MaxSpareServers values but I still get some downtime during peek hours. How can I calculate the best values for my configuration based on the amount of ram that I have ? Each process is like 36-40 M of Memory total used free shared buffers cached Mem: 3096 793 2302 0 0 0 -/+ buffers/cache: 793 2302 Swap: 0 0 0 Values that I am using now <IfModule prefork.c> StartServers 10 MinSpareServers 22 MaxSpareServers 60 ServerLimit 90 MaxClients 90 MaxRequestsPerChild 400 </IfModule>

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• Problem with running a flash Program from pendrive

  - by rajivpradeep

  Hi, I have a USB drive with two partitions in it. one hidden and the other normal. i have an application which swaps the memory and runs the flash application in hidden zone. The problem is that the application works fine on windows7 and when run on WINXp, it swaps the partitions but doesn't run the flash applications but just keeps running in the background. I can see it in task manager. But, when i copy the application to desktop and run , it runs with no glitch I was facing the same problem on WIN7 too , but it was running as required when i ran it using "Run in Xp mode" and then i applied a SHIM and is running since then as required. the application is built using VC++ 2008 , What might be the problem.

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• "The requested operation could not be completed due to a file system limitation" 3202

  - by user46529

  I backup SQL Server database and it fails BACKUP DATABASE dd TO DISK = '\backupServer\backups\dd.bak' WITH COMPRESSION, CHECKSUM, NOFORMAT, INIT , BlockSize = 65536 , BufferCount = 2200 , MaxTransferSize = 4194304 The backup size is 3TB and I have 6TB free space on bacup server. I am using backup parameters per SQLCAT whitepaper. Everything works ok when I backup to local HDD and it always fails when I backup to network share. After about 6 hours. Can't find why. Thank you. Yes. The backup over the network is fastest and saves me 3Tb of local disk space :) Thanks for pointing to the memory issue. I left 4Gb to OS and it worked!

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• Server Sizing Methodology

  - by adbrpc

  Our development environment consist of JBoss 5.0.1 DB Server, SQL Server 2008, Oracle IDM. Hardware is Win 2008 32 bit, 4GB RAM. We have reached stage where our environment can not handle application resulting in JBoss shut down throwing out of memory errors and CPU reaching to 90% usage. I am looking methodology to calculate correct server sizing where I input TPS, max number of concurrent users, max CPU utilization etc.. to give me number of servers, RAM size, number of cores. I am expecting application to grow 10% annually. Load Balancer and Failover should also be taken in account while sizing.

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• How can I get a windows server to collate and email 4 daily reports/graphs for server performance

  - by Glyn Darkin

  I run a windows 2008 webserver and would like to setup the most basic performance monitoring in the world. What i would like is: a plot of ASP.Net request time for each w3wp process for a 24hour period a plot of CPU% utilisation for each w3wp process for a 24hour period a plot of Memory utilisation for each w3wp process for a 24hour period a plot of network utilisation for each w3wp process for a 24hour period a plot of disk utilisation for each w3wp process for a 24hour period I would these plots to be emailed to me each morning. Anybody know what is the simplest way to set this up? Thanks for your help in advance. Glyn

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• Server OS: put it on a separate drive? Yes, no, or depends on the situation?

  - by captainentropy

  Hi, I would like opinions, or facts, both preferably, on whether it's ok to install a server's OS on the RAID array or not. I would predict installation on separate drives is the best but I'm interested in the performance. The server in question will have 8 cores (2.4GHz ea.), 24GB RAM, and ~16TB of usable space of server-class drives in RAID10. There is also a subsytem of an ~equivalent size for backup. I will be running CPU/memory intesive applications on this server in addition to it being file storage for my work (research lab). IF I install the OS (haven't decided which one, probably Ubuntu or Fedora or some other good linux distro) on separate drives will there be any performance problems if they aren't configured in RAID10? IF it is better to have the OS on separate drives should I go for 150GB velociraptors in RAID1 or smallish SSD drives in RAID1? Money is unfortunately a factor as I think I'm close to maxing my budget as it is. Thanks!

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• Facing difficulty with migrating from wordpress to Drupal

  - by rakibtg

  One of my blog was build of Wordpress but now i want to use Drupal as the CMS of my Blog. To do so I have deleted all the Wordpress files from my server and the Database and MySQL user which are associated with wordpress blog and uploaded the Drupal files in my server directory where the wordpress files were. But, when i have opened the blog it shows the Wordpress blog! though its been deleted and their should be the Drupal Installation interface. So, i have re-checked my server directories and database, there is not wordpress files and wp database all are deleted, there is only the drupal files, but when i go to the blog to install drupal there is still the Wordpress blog, I have checked the blog in many web browsers and there is not cache memory problem. My hosting server is linux based. can't understand what to do? Any idea? Thanks

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• aptana/eclipse blocks other apps

  - by waquner

  Hi, I've got a fresh win7 installation, the only apps installed so far are aptana (beta 3)/eclipse and firefox + chrome (except antivirus and drivers) Every time I start aptana, chrome and firefox are blocked, so firefox can't load a webpage (or sometimes takes veeeery long) and chrome doesn't even take care of events (so for example hovering over a link doesn't change the cursor and a click does...nothing or typing in an url, press enter - nothing happens) First I thought, aptana downloads something and blocks my internet connection... but IE works well and also there are no signs in the taskmanager (cpu%, network or memory) When I close Aptana, all works as before. I tried updating Java, which didn't help... On my office-computer I use the same apps and it works perfect. Got any ideas? TIA, waquner

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• Uploading my ITunes music that I saved on a flash drive to ITunes on my new computer then downloading it to my Ipod Touch

  - by Joshua Kricker

  I had an old computer with Windows XP. I transferred all my music, at least I hoped I had to a flash drive. Also, my computer kept giving me error messages that it could no longer sync to my Ipod Touch First Generation. I reformatted my Ipod back to original factory specs on the old computer. I have a new computer with Windows 7. I can't transfer my music from my flash drive to the ITunes Library. I also can't transfer it to my Ipod. I keep getting the message "Songs cannot be added to the Ipod because all of its space has been reserved for data." There's nothing in the Ipod memory. It's clear. What can I do? I want my music back.

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• How to keep programs from source up to date?

  - by wizard

  I'm designing a new server setup for hosting multiple websites. (Shared hosting for my clients over at SliceHost.) I've recently moved away from the traditional LAMP setup and chosen Ubuntu, Nginx, php-fpm and mysql. I like it a lot better then my old Apache, suphp, mysql setup. It works great, provided encapsulation between sites and uses substantiallly less memory. However I have one major maintenance problem. In order to have a recent version of Nginx and in order to use php-fpm I've had to compile these programs from source. The reason I see this as a problem is that keeping track of updates, and build configurations will end up being a lot of work. For two programs (and a patch) I can handle it, but it seems like this setup would not scale with many packages and servers. Are there good ways to manage this situation? I'm sure people do this all the time.

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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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• Window 7 hangs on using Adobe Reader

  - by SahilMahajanMj

  Window 7 often hangs when i open some pdf file with Adobe Reader. First of all, Adobe Reader crashes and as soon as it stops, the window hangs and after few seconds, it displays a message quoting "Dumping Physical Memory" in a typical Windows98 manner and then the system reboots. This problem persists each time i use Adobe Reader. However, i have installed Foxit Reader to view Pdf files. But there are some issues with that also. As sometimes i have editable files, which could be done in Adobe Reader's newest version only. Suggestions on how to solve this problem would be appreciated.

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• Eclipse shows splash screen and closes. How to fix?

  - by Bozho

  Today I restarted my machine, and Eclipse (3.5, downloaded recently) shows a strange behaviour: shows splash screen for less than a sec quits This is in 100% of the cases, so I can't start Eclipse at all. Where can I find logs about this? I deleted all eclipse resources and re-unzipped it. Same thing. I have enough memory (IntelliJ runs fine), and my anti-virus software doesn't show any activity related to closing eclipse. Any ideas what might have caused this?

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• DIagnosing another Windows 7 Lockup

  - by MSEoris

  Im running windows 7 on a fairly modern machine (8gb ram, amd fx-6100, gtx 560ti) and I notice that periodically my windows seems to just hang for a little while. Frequently this occurs after a cold boot and i start up five or six small to medium sized programs, but also occasionally it occurs during normal usage. Basically what occurs is the screen locks up, there is no keyboard responsiveness for a period of 30 seconds to a full minute - after a bit of patience, control is returned, but I'm interested in figuring out what is causing such lockups. I checked the event log and dont see any issues, and all i can see in task manager is a spike in cpu and memory usage right after this occurs. Any tips on how to even begin to diagnose this? Thanks.

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• Apache spawning one process a day, what causes it?

  - by xtrimsky

  I have a PHP server running, with cron jobs etc... And once a day (between midnight and 3am), apache spawns one process that never ends. The server is a virtual server, so in a couple of days it eats up the whole memory. Is there a way to figure out what is crashing ? What php script isn't finishing ? Or what url via apache was triggered ? I have tried looking on the access logs, errors logs, but didn't find anything unusual. Thank you

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• Vista Startup - Cannot Find the File Specified

  - by Redmastif

  Yesterday I restarted my laptop because my Wi-Fi catcher wasn't working correctly, and when the computer reached the login screen, instead of showing my user account it said "Cannot find the file specified". I rebooted and ran the Startup Repair and Memory Diagnostics but nothing showed up. I also took the battery out for a minute and tried again but still no luck. The weird thing is that I cannot even boot into safe mode, it still shows the same error. I don't remember downloading or opening anything suspicious recently, and I have 3 different cleaners/anti-malware programs as well that I usually run about once a week. I did go into the registry recently but I didn't modify or delete anything as I was only checking to see if I had a certain key in it. I have a Dell laptop running Vista Home Basic SP2. If I have to I can reinstall the OS with the CD or even take it to Best Buy but I'd rather try and fix it first. Thanks.

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• Asus Z8NA-D6, not powering up/no signal for monitor

  - by s093294

  I have a Asus Z8NA-D6 motherboard. Been running fine so far with one E5504 Xeon processor. I have added another Xeon E5504 CPU to the second slot and it will not power up (or there is no signal to the monitor). The status lights turn on as normal. no error led. Nothing happens other then the leds start and both cpus/fans power up. HDD power up. I tried clearing CMOS. Any sugestions? http://www.asus.com/Server_Workstation/Server_Motherboards/Z8NAD6/#download Update. Removing ram for second cpu makes it boot atleast. itboots with memory pluged in for cpu 1. (2 4gb modules) when addin one more to the second cpu it still boots but bios only see the 2 blocks at cpu 1)

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• Problem with Win7 connecting to Internet

  - by Lucas

  Hello, I have had Windows 7 for about a year now and for the first four months it worked perfectly. But for the last 8 months it has been horrible. It will connect to the Internet for about 5 minutes and then just lose connection. It will reconnect in about 5 minues but then it just keeps disconnecting. I ran a virus scan about 2 weeks ago and I found a Trojan on my PC which I removed and dealt with. It was fine after that but now for these last couple days it has been just as bad as before. I think a virus is causing this but I will read any suggestions and tips to help me solve this problem. Thank you. PC DETAILS: OS: WIndows 7 Home Premium 64-Bit- System Model: Aspire M5802- Processor: Intel Core 2 Quad CPU- Memory: 8192MB RAM- Graphics Card: NVIDIA GeForce GT 220

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• Alternatives to y4mstabilizer; deshaking video

  - by Vi

  "Deshaking" means fixing the video captured from camera hold in hands. Is there open source video deshaker apart from y4mstabilizer from mjpegtools? Patch for mencoder is preferred. My current command line for processing video looks like: mplayer video_from_camera.avi -nosound -vo yuv4mpeg:file=/dev/stdout -really-quiet | y4mstabilizer -n -a 0.8 -r 30 -s 100 | mplayer -cache 1000 /dev/stdin -noconsolecontrols -vf crop=500:380:70:50,denoise3d=3:3:5:5 -vo yuv4mpeg:file=temporary.yuv y4mstabilizer is itself very unstable and often crashes (and it didn't work at all until I have patched memory allocation in it).

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• Monitoring disk block access in Linux

  - by VoidPointer

  Is there a way to gather statistics about blocks being accessed on a disk? I have a scenario where a task is both memory and I/O intensive and I need to find a good balance as to how much of the available RAM I can assign to the process and how much I should leave for the system for building its I/O cache for the block device being used. I suspect that most of the I/O that is currently happening is accessing a rather small subset of the device and that performance could be optimized by increasing the RAM that is available for I/O buffering. Ideally, I would be able to create something like a "heat-map" that shows me which parts of the disk are accessed most of the time.

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• Solutions for scheduling cronjob

  - by Shamsul

  I have setup a list of corn, Some of the corn script takes long time like 1-5 hours, and its increasing day by day. I do not want to run two corn script at the same time, its not for the dependency, bu its because my server memory is not that much so that it can not handle two big operation, so i need to find out a solution so that the scheduled scripts will not start until the other previous script no finished. i have 10-15 corn job in the list. and 5 of them i do not want to overlap. Anyone help me find out any solutions?

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• Occasional HDD Related Hangs

  - by diolemo

  I have an issue that seems to be disk related. Occasionally my system will block for 30 or so seconds and is mostly unresponsive. Those things already in memory requiring no disk access continue to function but those things requiring disk access (even small) hang. 30 seconds later everything is back to normal. I have 2 Samsung drives in RAID 0. I have 1 WD drive (has pagefile) I have an SSD used for caching (Intel Smart Response). This is a new install of Windows and the drives were fine in my old PC (~1 month ago). Has anyone experienced anything similar? Any suggestions to solve this one? Thanks in advance.

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• Is it possible to make a (Windows 7) executable automatically run when I put in my thumb drive?

  - by iconoclast

  I have portable apps on a thumbdrive, and want to automatically run the "menu" app (E:\Applications\Windows\Start.exe) when I insert that drive. I realize (or think I realize, based on a foggy memory of trying to find a way to do this some time ago) that it can no longer be done with the old autorun approach, at least not in Windows 7. But there must be some other way: maybe a daemon process that waits for the thumbdrive to be inserted, and then fires up the .exe file? Maybe a daemon that tries every five minutes or so to launch the menu, and doesn't make a fuss when it's not there. Maybe something else? How can I achieve this?

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• Open source monitoring tool without sending data to "Their Server"

  - by hangu

  I trying to use open source server monitoring tool. I know there are a lot, but I couldn't find what I need.. the basic process of monitoring tool I used to use before was, 1) Install agent in my server which I want to monitor 2) The agent send data to "their server" 3) I can check the health of my server through web browser presented by them. What I need is, avoiding "Step 2". Are there any monitoring tool that I can use? I have Windows 2008 and Linux servers simple feature will be enough like (CPU, Memory, Network..) Thank you

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