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• How to make a vm scale when demand for resource increases

  - by Cray XT3

  i am having a server with 16 virtual core and 24G RAM,using Xen virtualization and ubuntu as dom0 Created 4 VMs (in para mode),each with different applications. CPU Load vary on each vm,somtimes first vm reaches nearly 100% CPU and others under 25% or even less. So is there a way in which vm can get cpu from other vms when they are not actually using it or utilization is under 25%.Same in the case of RAM also. I am not sure whether i am mentioning Cloud here. Initially i would like to give every vm a single VCPU,but can scale up to 8 or more by taking cpu from other vms if they are not using it. Is there any kind of tool that makes vm to scale its resources when demand increases. Is cloudstack and openstack designed for these kind of purpose or is that just a GUI to manage VMs.

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• How can I receive more traffic? My VPS fails!!!

  - by Vic

  I have a web site - photo gallery. About 400 photos. Site on Gallery 3. mySQL. Hosted on VPS from myhosting.com (CPU 1792 MHz, 2048 MB RAM). Everything seems to be ok, but there is one big problem. Once traffic reaches ~ 20 people (online) - website start loading really really slow. Actually website can't be loaded about 30-60 sec. What should I do? Buy more RAM / CPU on the same VPS? Move to a dedicated server or maybe myhosting.com just sucks? What do you recommend?

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• Installed 4GB memory but Windows XP 32 bit only reporting 2GB?

  - by AnthonyWJones

  I've just taken an existing XP Pro 32 bit system that had only 0.5GB of memory installed and maxed it out to 4GB. The BIOS reports the 4GB ram however when XP is booted and I look at the computer properties only 2GB of RAM is reported. Can anyone explain this? Before we go up any blind allys the /3GB switch is not the answer here, I have no need for a single process to use more the 2GB of memory. I'm wondering if the the 32 bit XP Pro is deliberately limited to 2GB. I seem to remember seeing an excellent table on a Microsoft site listing all the various SKUs of Windows and what each one was limited to. However I can't seem to find that table now.

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• diagnosing random power down crashes on a hackintosh [closed]

  - by Iain

  I have a hackintosh running on a Gigabyte P55M UD2. It has run without a single issue as a hackintosh for about 9 months, and the machine is about 2.75 years old. Never had issues when it was just linux box. Power supply is 750 Watts. It recently started spontaneously rebooting, no seeming connected to any particular use case or ram/cpu load. There is no hanging or anything, just suddenly acts like the power went out. The frequency of which seems to be increasing. I've tried using just one of each of the two ram sticks, and it happens with either one in. I'm not sure what to try next, is there some way of determinging whether it's a mobo, cpu, or powersupply issue short of replacing them all? thanks! Iain

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• Installed 4GB memory but Windows XP 32 bit only reporting 2GB?

  - by AnthonyWJones

  I've just taken an existing XP Pro 32 bit system that had only 0.5GB of memory installed and maxed it out to 4GB. The BIOS reports the 4GB ram however when XP is booted and I look at the computer properties only 2GB of RAM is reported. Can anyone explain this? Before we go up any blind allys the /3GB switch is not the answer here, I have no need for a single process to use more the 2GB of memory. I'm wondering if the the 32 bit XP Pro is deliberately limited to 2GB. I seem to remember seeing an excellent table on a Microsoft site listing all the various SKUs of Windows and what each one was limited to. However I can't seem to find that table now.

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• How to scale out OpenStreetMap data efficiently

  - by Pierre

  For over a year now, I'm running an in-house PostGIS server filled with OSM data, used for both Mapnik-based tile generation and Nominatim-based geocoding, updated with day replicates. This works pretty well. However, as usage is growing exponentially, I would like to achieve better reliability and performance by adding additional PostgreSQL servers. And I'm kind of lost. Since PostgreSQL doesn't seem to handle replication by itself, I would think about using a piede of middleware like PgPool-II to keep the servers in sync. But I'm afraid it would be nothing but necessary for this usage : very high read-to-write ratio, where all writes are done at the same exact time every day. My questions are simple : What would you do to keep these servers in sync? And, what is done for this at the OpenStreetMap Foundation, MapQuest, Mapbox or CloudMade? Thanks.

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• Do virtual machines perform better on the host HDD or USB drive?

  - by Jeremy Ricketts

  The question I'm asking is kind of general, and I'll give more specifics about my specific setup. Here's the main question though: Do virtual machines generally perform better on the host HDD or is it better to operate them from an external disk? My specific setup: A Macbook Pro with a nearly full internal SATA drive that spins at 7200. On this system I'm running large programs like Photoshop and some other RAM-intense applications. I've dedicated 2 of my 8 gigs of RAM to my VMware Fusion virtual machine, which runs Windows 7 and Visual Studio, sits on the same drive. When that thing boots up, my system really starts crawling. I have an external USB (specifics of that drive are here) which I'm thinking about moving the VM to. Obviously a USB drive is slower than my internal HDD, but maybe having two operating systems using the same disk is WORSE than putting one of them on a separate (albiet slower) disk. This a bad idea?

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• MySQL too many connections

  - by Webnet

  On my server I have 7 databases. Our server has 512 MB of RAM which I'm getting upgraded this evening to 2GB and has a 2.4 single processor. I've gotten an error about the connection limit exceeded. With increasing my RAM, is it ok to increase the number of connections? Currently it's set to 200 but a single page may connect to 3-4 databases considering JOINs and things. We've setup so many databases for mere organization. We have a total of about 250-300 tables in all of the databases. Any advice would be appreciated :)

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• ASUS K55VM Laptop unexpectedly shuts down

  - by Abhishek Sha

  I've read quite a few questions on SuperUser of people having laptop shutdown problems but mine is different. My laptop specs: Intel Core i7 3610QM (IvyBridge) NVIDIA GT630M 2GB and Intel GMA4000 8GB RAM Windows 7 64 Bit My laptop occasionally shuts down when playing FarCry 3. It's around 5 months old. I've played games like Crysis and it never shuts down unexpectedly. Since I experienced this shut down recently, I decided for GPU-Z to log the temperatures. The final log value at the time of shutdown were thus: GPU Core Clock [MHz] - 797.3 GPU Memory Clock [MHz] - 896.8 GPU Temperature [°C] - 89.0 GPU Load [%] - 99 Memory Controller Load [%] - 36 Video Engine Load [%] - 0 Memory Usage (Dedicated) [MB] - 535 Memory Usage (Dynamic) [MB] - 53 VDDC [V] - 1.0620 My drivers are up-to-date and I didn't encounter any BSODs at the time of shut down. It simply turns off.

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• increase performance of virtual machines on the 27" imac

  - by evan

  I'm using a 27" iMac (i7, 8GB RAM) at work and normally run two or three virtual machines at the same time, which hurts the performance of each virtual machine. I've learned on these forums the best way to increase virtual machine performance (aside from RAM) is to have them running on a separate hard drive from the one the OS is on. Of course with the iMac you can only have one hard drive and not even an SAS or solid state drive (well you could probably take it apart and put one in yourself but I wouldn't be permitted to do that). That being said, do you think it would help to run one or more virtual machines from a firewire external drive (or a usb 2.0)? Thanks for your input!

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• How to disable VGA on new server... reversibly?

  - by Javawag

  Strange question here. I have a server with 1GB of RAM, however when booted this shows as 768MB. I've discovered the reason for it – and that is that it has an unboard graphics card which shares memory with main RAM. Running Ubuntu Server, it doesn't actually ever use anything graphical – it's all set up to be SSH'd into and therefore there's no need to use the VGA. I believe there may be a setting to switch off VGA/graphics card in BIOS, but my question to you guys is: is this recommended? and if I turn it off, then how would I turn it back on again in BIOS (given that with it off, I wouldn't be able to see the option to turn it on as there would be no graphics output!!)?

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• Is Software Raid1 Using mdadm with a Local Hard Disk and GNDB Possible?

  - by Travis

  I have multiple webservers which use many small files to created dynamic web pages. Caching the web pages isn't an option. The webserver also performs writes so I need a synchronous filesystem. I'm looking to maximise performance as it's my understanding that small files is the weakness (to varying degreess) of a cluster filesystem over ethernet. Currently I'm using Centos 5.5, 64 bit. Since it's only about 300MB of data, I'm looking at mdadm using RAID-1 with the GNBD and a local hard disk using the "--write-mostly" option so the reads are done using the local hard disk. Is this possible? If so, is there any advantage to making it a tmpfs disk instead of a local hard disk? Or will the files on the local hard disk just get cached in RAM anyway so I won't see a performance gain by using tmpfs, assuming there's enough RAM available?

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• Supermicro MBD-X9DRL-IF-B and 8 X Hynix 4Gb DDR3 ECC dont boot

  - by Avi Keinan

  I have a custom build server with 2 Xeon E5-2609 and Supermicro MBD-X9DRL-IF-B. Right now the server has 4X Hynix 4Gb 2Rx8 PC3L-10600R-9-10-B0 HMT351R7BFR8A. and its working great. We baught another 4 from the same series of memory, when we installed all the ram (4 sticks already installed and we added 4 new sticks) the server didn't boot. When we replaced the current memory with the new memory - the server did boot. Right now we are in a problem because we need to extend this server ram but the motherboard don't run with 8X4Gb. Any ideas why? I have attached a picture with one of the current memory stick and one of the new memory stick. Thanks in advence.

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• How to get - number of threads per process?

  - by user42159

  This is one Ubuntu 9.10 server. Also how to see memory usage per process? Thanks

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• What are best monitoring tool customizable for cluster / distributed system?

  - by Adil

  I am working on a system having multiple servers. I am interested in monitoring some server specific data like CPU/memory usage, disk/filesystem usage, network traffic, system load etc. and some other my process specific data. What are available open source that can serve my purpose? If it provides to customize the parameter to be monitored and monitor your own data by creating plugin / agent. Any suggestions? I heard of Nagios, Zabbix and Pandora but not sure if they provide such interface.

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• Linux (non-transparent) per-process hugepage accounting

  - by Dan Pritts

  I've recently converted some java apps to run with linux manually-configured hugepages. I've got about 10 tomcats running on a system and I am interested in knowing how much memory each one is using. I can get summary information out of /proc/meminfo as described in Linux Huge Pages Usage Accounting. But I can't find any tools that tell me about the actual per-process hugepage usage. I poked around in /proc/pid/numa_stat and found some interesting information that led me to this grossity: function pshugepage () { HUGEPAGECOUNT=0 for num in `grep 'anon_hugepage.*dirty=' /proc/$@/numa_maps | awk '{print $6}' | sed 's/dirty=//'` ; do HUGEPAGECOUNT=$((HUGEPAGECOUNT+num)) done echo process $@ using $HUGEPAGECOUNT huge pages } The numbers it gives me are plausible, but i'm far from confident this method is correct. Environment is a quad-CPU dell, 64GB ram, RHEL6.3, oracle jdk 1.7.x (current as of 20130728)

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• PC shut downs automatically after a second

  - by emzero

  I have this not-so-old computer that's not being used for a year or so. Specs: Motherboard: ASUS PN5-E SLI CPU: Intel Core2Duo E4300 RAM:2x2GB SuperTalent DDR2-800 VGA: Zogis GeForce 7950GT PSU: Vitsuba San-55-S 550w HD: No hardrives yet When I power on the computer, everything seem to start, but right away the whole system shuts down. I've removed and changed the RAM sticks, take out the VGA, everything I could think of. So what could it be causing this? The PSU? The motherboard is dead? The CPU? Any help to isolate the problem will be useful. Thanks PS: Please don't close the question, this could be helpful to anybody having a similar problem, even with different hardware.

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• PC is very slow

  - by Appoos

  Hi All, My Windows XP system is very slow. I tried all possible ways of improving the performance. But now luck. I've 4GB RAM and AMD Phenon XII B53 processor. I don't see any applications consuming CPU resources. But the Page File usage is 4.18 GB(System Managed size in MyComputerPropertiesPeformance). There is enough RAM available, but still why OS is using Page File? How can I improve the Page File usage? Please help me.

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• My WD passport detected but not shown on my computer

  - by Rakesh Patel

  1TB WD harddisk is detected in laptop but drives not visible on my computer. Under disk managment drives shown without letters. Right clicking on these drives give 2 options: Delete volume Help. The same harddisk was running well on the same laptop a day before. It is also showing full size of hard drives, Healthy (Primary Partition) etc. (this happened after harddisk usage by guest). Harddisk is new only (about 5 month usage) Please suggest: Is there hardware related problem inside harddisk, if so is it repairable? Is there any option to recover data?

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• Making the most of dual channel DDR2: how do I arrange the sticks?

  - by andrz_001

  I've searched online, but I can't find anything definitive that will put me at ease. I turn to superuser. This is how I have the RAM sticks arranged now: To make the most of the RAM and the dual channel capability, it occurred to me that perhaps I have the sticks arranged incorrectly. Should I move the stick in the DDR2_2 slot one over--to the adjacent, red slot? I appreciate any suggestions. (BTW, can something in BIOS tell me whether I'm running at "optimal" memory speeds??) edit: I'm running Windows XP SP3, 32-bit. Thanks.

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• Server not responding to SSH and HTTP but ping works

  - by yes123

  Hello guys, I requested an hard reboot because none of ssh and http worked. Ping worked normally. Which logs should i check to understand what was the problem? Thanks! (debian 6 on lamp) Edit: my memory and swap: Mem: 4040068k total, 1114920k used, 2925148k free, 109212k buffers Swap: 1051384k total, 0k used, 1051384k free, 283820k cached 4 GB ram (and more than 1TB of HDD) The cause is from 2 days ago: look how the usage of swap goes +60% in less than 10hours My control panel reports this as top 5 memory usage process: If every apache2 process is 190MB large that sux because IF i do TOP i have 262 sleeping process most of them are apache2! My apache mpm_prefork settings are: <IfModule mpm_prefork_module> StartServers 5 MinSpareServers 5 MaxSpareServers 10 ServerLimit 1500 MaxClients 1500 MaxRequestsPerChild 2000 </IfModule> KeepAlive On MaxKeepAliveRequests 100 KeepAliveTimeout 4

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• Utility to monitor vsftpd.log

  - by Claudiu

  Is there a Linux utility that can monitor vsftpd.log an extract bandwidth usage information for every user ?

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• What affects video encoding speeds?

  - by Pig Head

  FRAPs doesn't compress its videos when you record, so the files are enormous. In a long recording you can get up to a few hundred gigabytes. Obviously, usually you would need to convert/compress them. What affects the speed of this? I don't think the RAM does, as when I converted 600 gb my RAM usage only went to 6 gig, but the processor was at 100%, which is surprising as I have a 6 core processor @ 3.46 ghz. Would clock speed or cores help the most?

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• Need Help Debugging BSOD

  - by nmuntz

  For the last few days I've been getting a BSOD at least once a day. Apparently the crash has been caused by ntkrpamp.exe and searching on google has revealed that the issue seems to be related to bad RAM. I have run memtest and my RAM modules have no errors on them. I'm pretty sure the issue is related to drivers, but I can't figure out which one. I'm not an expert in interpreting the output of windbg so any pointers would be greatly appreciated. Here is my analysis with WinDbg. It was too long to paste it here. One strange thing i noticed is that my Windows XP is in Spanish (SP3) and ntkrpamp.exe copyright info seems to be in portuguese. Not sure if that could be an issue, perhaps i have the wrong ntkrpamp.exe... Thanks a lot in advance

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• High load on a nagios server -- How many service checks for a nagios server is too many?

  - by Josh

  I have a nagios server running Ubuntu with a 2.0 GHz Intel Processor, a RAID10 array, and 400 MB of RAM. It monitors a total of 42 services across 8 hosts, most of which are checked using the check_http plugin even 5 minutes, some every minute. Recently the load on the nagios server has been above 4, often as high as 6. The server also runs cacti, gathering statistics every minute for 6 hosts. I wonder, how many services should hardware like this be able to handle? Is the load so high because I am pushing the limits of the hardware, or should this hardware be able to handle 42 service checks plus cacti? If the hardware is inadequate, should I look to add more RAM, more cores, or faster cores? What hardware / service checks are others running?

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