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• how to drop_caches in OpenVZ centos6 container

  - by Omar Jackman

  I have tried sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches' sudo echo 3 > /proc/sys/vm/drop_caches echo 3 > /proc/sys/vm/drop_caches and a bunch of other variations but with every try I get bash: /proc/sys/vm/drop_caches: Permission denied How do I clear the ram used for buffers/cache in my centos6 openvz container? It seems like the only way to do what I need is to reboot the container.

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• Running out of LowMem with Ubuntu PAE Kernel and 32GB of RAM

  - by magneticMonster

  I'm running a Java data import process on a 32-bit Ubuntu 10 PAE kernel machine. After running the process for a while, the oom-killer zaps my Java process. After some Googling and digging through docs, it looks like the system is running out of LowMem. I started the process for the third time and am watching free -lm show me Low: 464 386 77 with the free value (77MB) slowly decreasing. Why am I running out of lowmem and how do I increase it? Some details: $ cat /proc/sys/vm/lowmem_reserve_ratio 256 256 32 $ free -lm total used free shared buffers cached Mem: 32086 24611 7475 0 0 24012 Low: 464 407 57 High: 31621 24204 7417 -/+ buffers/cache: 598 31487 Swap: 2047 0 2047

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• windows server 2003 R2 64bit not seeing more than 4gb ram

  - by Mo

  shouldn't win 2003 R2 64bit see more than 4gb by default or am I missing a setting somewhere? hardware is SuperMicro X6DVA-EG. http://msdn.mzicrosoft.com/en-us/library/aa366778%28VS.85%29.aspx#physical_memory_limits_windows_server_2003

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• Debian (wheezy) force cache to RAM

  - by Marek Javurek

  I have Linux server running about 6 game servers. I have 3 GB total of RAM but I use only about 500 MB. Is there a way to cache one of my game servers (all the files - even not actually used maps etc. - about 1,5 GB) to RAM? The reason I want to do this is because my Linux server is virtual and the hard drives ar very slow, so there is really big IO wait time. IO: http://i.stack.imgur.com/7HLhB.png

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• What’s the Minimum System Spec Recommended For Developer Laptop

  - by DaveDev

  I'll be regularly running Visual Studio 2010 Professional, SQLServer Express, Office and at least 1 virtual environment running a Linux Distro. I want the machine to be snappy and responsive even when doing a reasonable amount of Development work. I want to spend what it takes for this, but I don't want to go overboard spending more than I need to. I won't be playing many games or graphics processing so i won't need a monster of a machine. Any recommendations?

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• Apache taking up too much CPU

  - by andrewtweber

  I'm trying to manage a server on Amazon for a network of sites that receives about 100 million pageviews per month. Unfortunately, nobody out of my team of 5 developers has much server admin experience. Right now we have the MaxClients set to 1400. Currently our traffic is about average, and we have 1150 total Apache processes running, which use about 2% CPU each! Out of those 1150, 800 of them are currently sleeping, but still taking up CPU. I'm sure there are ways to optimize this. I have a few thoughts: It appears Apache is creating a new process for every single connection. Is this normal? Is there a way to more quickly kill the sleeping processes? Should we turn KeepAlive on? Each page loads about 15-20 medium-sized graphics and a lot of javascript/css. So, here's our Apache setup. We do plan on contracting a server admin asap, but I would really appreciate some advice until we can find someone. Timeout 25 KeepAlive Off MaxKeepAliveRequests 200 KeepAliveTimeout 5 <IfModule prefork.c> StartServers 100 MinSpareServers 20 MaxSpareServers 50 ServerLimit 1400 MaxClients 1400 MaxRequestsPerChild 5000 </IfModule> <IfModule worker.c> StartServers 4 MaxClients 400 MinSpareThreads 25 MaxSpareThreads 75 ThreadsPerChild 25 MaxRequestsPerChild 0 </IfModule> Full top output: top - 23:44:36 up 1 day, 6:43, 4 users, load average: 379.14, 379.17, 377.22 Tasks: 1153 total, 379 running, 774 sleeping, 0 stopped, 0 zombie Cpu(s): 71.9%us, 26.2%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 1.9%si, 0.0%st Mem: 70343000k total, 23768448k used, 46574552k free, 527376k buffers Swap: 0k total, 0k used, 0k free, 10054596k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1756 mysql 20 0 10.2g 1.8g 5256 S 19.8 2.7 904:41.13 mysqld 21515 apache 20 0 396m 18m 4512 R 2.1 0.0 0:34.42 httpd 21524 apache 20 0 396m 18m 4032 R 2.1 0.0 0:32.63 httpd 21544 apache 20 0 394m 16m 4084 R 2.1 0.0 0:36.38 httpd 21643 apache 20 0 396m 18m 4360 R 2.1 0.0 0:34.20 httpd 21817 apache 20 0 396m 17m 4064 R 2.1 0.0 0:38.22 httpd 22134 apache 20 0 395m 17m 4584 R 2.1 0.0 0:35.62 httpd 22211 apache 20 0 397m 18m 4104 R 2.1 0.0 0:29.91 httpd 22267 apache 20 0 396m 18m 4636 R 2.1 0.0 0:35.29 httpd 22334 apache 20 0 397m 18m 4096 R 2.1 0.0 0:34.86 httpd 22549 apache 20 0 395m 17m 4056 R 2.1 0.0 0:31.01 httpd 22612 apache 20 0 397m 19m 4152 R 2.1 0.0 0:34.34 httpd 22721 apache 20 0 396m 18m 4060 R 2.1 0.0 0:32.76 httpd 22932 apache 20 0 396m 17m 4020 R 2.1 0.0 0:37.34 httpd 22933 apache 20 0 396m 18m 4060 R 2.1 0.0 0:34.77 httpd 22949 apache 20 0 396m 18m 4060 R 2.1 0.0 0:34.61 httpd 22956 apache 20 0 402m 24m 4072 R 2.1 0.0 0:41.45 httpd

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• Intel P6100 CPU and Mobile Intel® HM55 Express Chipset

  - by Christopher Painter

  I have an Asus K52F-BBR5 notebook that uses an Intel P6100 ( 2GHZ 15x multiplier) and HM55 Express Chipset. I'm looking to replace it's 3GB with 8GB. The Crucial database seems to indicate that a PC3-8500 CAS 7 and PC3-10666 CAS 9 will both work. I'm not up to date on the latest DDR3 nomencalature and I'm wondering which would provide better performance. The price difference is negligible. Drawing on past experiences from many many years ago I could make an argument for either based on sync/async bus speed arguments and CAS latency differences but the truth is I don't know enough about the HM55 chipset to know which would be the correct choice. Does anyone know the answer or point me to information that would help me make the choice? I'm pretty sure the performance difference will be somewhat negligible also but still I'd like to make the optimal choice.

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• Will increasing RAM improve Lightroom 3 large tiff loading times

  - by andy

  Set up: mid 2009 17" unibody MacBook Pro 4GB RAM 2.66 Core 2 Duo Snow Leopard 10.6.6 Lightroom 3 When working with 12 MegaPixel RAW files from a Nikon D700, no problem. Lightroom is fine. Recently I've been scanning film and they result in large tiff files, about 130mb each. The tiff files themselves are good, and I'm happy with my scanning workflow. Working with these files in Lightroom is perfectly fine, except for one step. When I choose one of these photos in the Develop module, Lightroom displays the "Loading" on the image for about a minute or two, which is quite long. Once the image is loaded, then everything is fine again, and applying effects is instant. So my only issue is reducing that "loading" time in the develop module (the library module is fine too). Will increasing my RAM to 8GB help? I'm worried about spending the money and it not making any difference. thanks andy

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• What is the difference in RAM speeds?

  - by jasondavis

  I am building a new PC with the intel i7-930 processor. I am wanting to use 12gb of RAM for it (6x2gb sticks). Here is some of the RAM I am looking at G.SKILL 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Triple Channel Kit Desktop 2 of these 3 stick kits. They are rated at 1600 however some of the user reviews on that product say they xcould not get it to run at 1600 and the supplier who makes the RAM made a comment that "I7 doesn't support over DDR3 1066" So I am curious, I do not know much about this, I know the more GB of RAM the better but as for the speeds, I am not sure how much of a difference it makes. So can someone explain to me what the difference in performance may be based on speeds of 1200 vs 1600 ram?

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• What advantage to I have if I use 64bit libraries?

  - by RadiantHex

  Hi folks, I see many people go crazy about 64bit libraries, and preferring them in general to the 32bit counter parts. I realise there is a lot of talk that gets lost in translation, and that the 64bit can be often over-valued. The setting is libraries that are called on web application, I'm aware that a new instance of the web app is generated for each hit. Therefore I'm thinking that 64bit is not necessary as the instances in no way surpass 2Gb of RAM usage. Help would be much appreciated! :)

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• What influences the kind of RAM a desktop or laptop can support?

  - by Albert Iordache

  What exactly influences the kind of RAM a desktop or laptop can support? Apart from the clock speed, the maximum amount of RAM the motherboard can handle, the DDR type (1/2/3) and the shape of the module (DIMM for desktops, SO-DIMM for laptops)? I see that in certain cases, such as with the Kingston 4GB DDR3 1333MHz CL9, (and on the Kingston KTD-L3B/4G page) the page displays a set of laptop product numbers. Does the actual model of the laptop also influence the models of RAM it can support? Could, for instance, an Asus K52 work with that particular RAM module, even if it specifies Dell models?

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• CPU Test Similar to Memtest?

  - by Nick Whaley

  I need an easy way to do system stability tests. I have come to rely on Prime95 which does a fantastic job of proving stability (or instability) very quickly; but it requires an OS installed. I would like something like Prime95 that stresses both CPU and RAM (maybe PCI-Ex bus also?) but runs in a nice bootable binary like Memtest86+ does, so I can boot it from a thumbdrive. Does such a thing exist?

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• SAP va étendre le champ d'application de sa technologie « In-Memory » et réduire la complexité des environnements IT

  SAP va étendre le champ d'application de sa technologie « In-Memory » Et réduire la complexité des environnements IT Le « In-Memory » consiste à mettre en cache les données traitées par les applications plutôt que, par exemple, de faire des appels à un serveur. Chez SAP, la technologie est baptisée HANA (High-Performance Analytic Appliance). Elle peut, d'après les benchmarks de l'éditeur Allemand, aller jusqu'à diviser par 1200 le temps de traitement de certains scénarios. SAP a intégré HANA à la dernière version de

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• Can I use the unused 1G of 4G on a 32bit machine as a ramdisk?

  - by askvictor

  I have a machine with 4G of RAM, but running 32bit windows 7, so can only see 3G. I have read somwhere recently that that unused 1G can be used as a RamDisk. Is this true? What sort of program allows that, and how does it address that gig of RAM?

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• ReadyBoost in Windows 7

  - by Robert Koritnik

  I've bought an SD card today for my phot frame, but when I inserted it into my notebook I saw I could use it for ReadyBoost. Some background I'm a .net developer, using VMs and developing web applications (and Sharepoint). I use an HP notebook machine with Core 2 Duo 2GHz + 4GB RAM + 320 7200 HD. I simultaneously run Visual Studio 2010 with some plugins SQL Server Firefox with at least 10 tabs Chrome with about 5 tabs IIS VM with Server 2008 machine Sharepoint and occasionally also Photoshop and some InDesign as well. So I don't let my machine have a break. :D Question If I buy myself some really fast SDHC card (like SanDisk 16GB Extreme 30MB/s - is there anything faster) and use it with my Windows 7 ReadyBoost, will I see any performance gain? Is it going to work something similar to Seagate's HybridDrive Momentus with 4GB of solid state drive? What could I actually expect if I do put this card into my machine? And what would be recommended size? Observations I guess redirecting page file to it would speed up the system. Some VM machines on it would probably run faster as well because they could run parallel to HD host system I guess. Am I right or wrong?

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• Transfer used ram to swap and free more physical ram

  - by AbuOmar

  I have a vps with 256m physical ram and 512m swap space, I am trying to use a software that need more than 256m and less than 512m ram, so it uses swap. The problem is at some moment of the installation, the installation process checks the available physical ram, it's full (some swap is used), so it pauses the installation and tills that it must be some more ram to continue the installation.. I see that I need to move some of used physical ram to swap while the process is running.. Is there anyway I can do that? or any other solution! For sorry I am using openvz vps, and the vm.swappiness option can't be modified as a solution.

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• What is a normal value for pages/sec on a Windows Server 2003 Web Server?

  - by Emil Lerch

  I know the answer to this is "it depends", and I know that the counter can and will be thrown off by backup jobs or other things that might use memory mapped files. I'd like to get a bit of clarity over exactly what "it depends" on and some general guidelines around what a healthy web server normally shows for this counter. So if activities regarding memory-mapped files are excluded, if I have ample amounts of memory, should I really see this down close to 0? When should I get suspicious that I might need additional RAM and/or start looking for application memory leaks?

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• Windows 7 x64 installation freezes on new PC build

  - by jhsowter

  Symptoms While attempting to install Windows 7 (64 bit) on my new PC build, it freezes usually at the point where it is expanding the windows image, but has frozen as early as accepting the licence agreement, and as late as just after the first restart. My specs are at the bottom of the post. So far I have tried the following to identify the problem, in rough chronological order: Tried different hard drives with different sata cables. Same symptoms. I later used a different computer to install windows on the same hard drive with no problems. Tried the RAM in different slots, and tried one RAM stick instead of two. Same symptoms. Updated the BIOS to 1.60. Same symptoms. Ran Memtest86+ with RAM in dual channel. It passed about 6 times when I left it running overnight. Used USB to install windows instead of an optical drive. Same symptoms. Change SATA configuration from AHCI to IDE. Same symptoms. Tried various different SATA ports. Same symptoms. Updated BIOS to 1.70. Same symptoms. I saw the RAM did not list my motherboard as being supported even though the motherboard did list the RAM as being supported. So I tried some Kingston DDR3 1333MHz RAM instead. Same symptoms. Other (possibly) pertinent information My CPU idles at about 30 °C. I can't tell what it gets to when it's working. When I installed the CPU, the lever which locks the CPU in place took quite a bit of force to pull down. Now I didn't just yank it down without rechecking the CPU was seated properly about 5 times, but it does seems unusual, and I wonder if the CPU was seated badly if I would see these symptoms? I am out of ideas and don't know how to diagnose any further. I suppose either the motherboard or CPU must be the problem. I am on the verge of taking it to a specialist. The Question How should I proceed from here? Is there anything I can rule out as being the source of the symptoms I am seeing? My Specs CPU: Intel i5 3570k RAM: G.Skill RipjawsX 8GB kit HDD: single 3.5" 500GB SATA or 160GB 2.5" SATA (at different times and sometime together. But no RAID or anything). MB: ASRock Extreme4 Z77 PSU: Silverstone Strider Plus 600W ST60F-P

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• 32bit vs 64bit guest VM and RAM usage

  - by sims

  Why does a 32bit domU (Xen guest VM) use less RAM than a 64bit? Notes: The same software complied for a different arch(AMD64 vs. 686). Obviously this is Linux or BSD or something easily ported. Maybe this is also a good one for SO. I've read this is so. I can guess why, but I'd like to hear everyone's comments.

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• Is 850W SMPS enough for the below Config?

  - by bali208

  We are planing to assemble a file server of the following configuration. 1) Intel S2400SC2 Motherboard. 2) Xeon 2407 Processor x 2 (Dual Processors) 3) 8gb x 8 ECC DDR3 RAM 4) One 2 TB Seagate HDD. 5) 8 cabinet fans fitted for NZXT Switch 810 Cabinet. Our question is is CoolerMaster 850 Watts power supply enough for our machine? Or we have to put 1050 Watts power Supply? Please suggest the best Brand and Wattage of SMPS we have to buy for our system. Thank you.

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• On Windows it's possible to monitor the hard faults for each process?

  - by Renan Vinícius Mozone

  I'm tuning a production server that runs Windows Server 2003 SP2. I want to monitor the hard faults (read an write separately) for each process. Is it possible?

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• Sustaining Dual Channel among many RAM modules

  - by Odys

  I'd like to know what are the factors that need to be set in order to sustain the Dual Channel mode. In a mobo with 4 DDR3 slots: Do I have to put pair of chips? Eg: If I put 3 identical chips only, will I have Dual channel or not? If I put 4 Ram chips that aren't from of same ventor/model, will I have the same latency among them (the highest of all)? Also, will I sustain Dual Channel mode? If one Ram has max frequency of 1033 and the other 3 chips are of 1300, will I have 1033Mhz for all chips and Dual Channel mode on? What if I put 2x4Gb and 2x8Gb chips (latency, Dual Channel)? Can I put 4Gb chips in slots 1 and 3 and 8Gb in slots 2 and 4 and still have dual channel mode enabled? (Some of the questions might sound silly but their answers aren't that clear to me) (Also, assume that there aren't any bottlenecks because of other parts on the system)

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• What is the SMMA flag?

  - by nimit parekh

  I'm new to computer architecture. What is the full form of the SMMA flag? Where is it used? Please help me understand it with a brief description.

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• How Do I Export Pages from Browser with Embedded Hyperlinks?

  - by Volomike

  Made a sad discovery today. I have Ubuntu 10.04 LTS. My client is in the ad business and she had a marketing competition task for me. She wanted me to visit websites of the competitors, and export the home pages as PDF. However, she wanted me to do so with embedded hyperlinks. As it turns out, Firefox (and even the latest Chrome) on Ubuntu 10.04 LTS do not embed hyperlinks in PDF web page exports. Sure, there are several Chrome and FF plugins that let you export as PDF, but what these do is connect to the URL remotely, generate the PDF remotely, and then force a download in your browser to download it from a remote location. That's not good for me, though, because some of these competitor pages require an initial login. That means that all I get back on the PDF printing from these FF or Chrome plugins is a login page. Is there a way to get around this problem, to fix the broken PDF printer on Ubuntu 10.04?

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• Xorg eating up too much RAM on Ubuntu 9.10 box

  - by Yang

  Xorg is eating up 444MB of 2GB total RAM on my Ubuntu 9.10 x86_64 machine with nvidia drivers installed for the nvidia G86 (GeForce 8300 GS). top shows: top - 18:21:41 up 6 days, 2:40, 9 users, load average: 0.46, 1.12, 1.22 Tasks: 266 total, 3 running, 262 sleeping, 1 stopped, 0 zombie Cpu(s): 8.4%us, 2.0%sy, 0.0%ni, 89.1%id, 0.5%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 2055736k total, 1965136k used, 90600k free, 3952k buffers Swap: 979924k total, 979908k used, 16k free, 102636k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1432 root 20 0 1154m 442m 7492 S 8 22.0 32:56.97 Xorg 18462 yang 20 0 1001m 219m 8356 S 0 10.9 5:13.25 chrome 24099 yang 20 0 865m 83m 13m S 0 4.2 0:06.91 chrome xrestop shows: xrestop - Display: :0.0 Monitoring 47 clients. XErrors: 0 Pixmaps: 40430K total, Other: 142K total, All: 40573K total res-base Wins GCs Fnts Pxms Misc Pxm mem Other Total PID Identifier 1c00000 21 46 1 19 697 9128K 18K 9146K 3169 x-nautilus-desktop 1000000 4 3 0 17 194 9000K 4K 9004K 3134 gnome-settings-daemon 1600000 51 2 1 25 1100 7648K 28K 7676K ? compiz For comparison, here's my other Ubuntu box, which also has compiz etc. enabled but with ATI RV370 (Radeon X300SE): top - 18:18:18 up 58 days, 4:27, 9 users, load average: 0.00, 0.00, 0.00 Tasks: 224 total, 1 running, 223 sleeping, 0 stopped, 0 zombie Cpu(s): 0.3%us, 0.3%sy, 0.0%ni, 98.8%id, 0.5%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 1024964k total, 987124k used, 37840k free, 247012k buffers Swap: 2048276k total, 94296k used, 1953980k free, 264744k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 24324 yang 20 0 61936 35m 6364 S 0 3.5 4:35.84 nxagent 1768 ntop 20 0 190m 32m 5388 S 1 3.2 283:36.15 ntop 1178 root 20 0 60588 29m 1788 S 0 3.0 5:48.89 console-kit-dae ... 1315 root 20 0 343m 4956 4020 S 0 0.5 3:43.87 Xorg Any ideas on how to get to the bottom of this? (i.e. not "Log out"/"Reboot") Thanks in advance.

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