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• First requests are painfully slow

  - by winSharp93

  I am running Redmine under IIS using Zoo. Installation was done using the Web Platform Installer and the default configuration has not been touched. However, when using the application, the first requests take very long to complete (sometimes more than one minute). During that time, the ruby.exe causes some CPU load (about 15%). According to the log files, it's mainly the views taking that long to render: Started GET "/redmine/login" for IP at 2012-09-04 09:54:08 +0200 Processing by AccountController#login as HTML Rendered account/login.html.erb within layouts/base (42150.5ms) Completed 200 OK in 43508ms (Views: 43008.5ms | ActiveRecord: 0.0ms) Rendered account/login.html.erb within layouts/base (42435.1ms) Completed 200 OK in 44100ms (Views: 43523.3ms | ActiveRecord: 0.0ms) After the initial delay, further request times are totally acceptable. Any ideas on how to speed up the warmup time?

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• Virtualization deployment for datacenter

  - by bogha

  Hi, my company is going to deploy an IT Infrastructure on a virtual platform, can you please help me with the following: 1- which one do you recommend, Cisco Unified computing system ( cisco + emc + vmware )or HP Blades( virtualization solution + HP Storage )? 2- i Need to install a DNS Server, Web server, cpanel for managing hosting packages and Microsoft layer of product for usingg in the corporate infrastructur ( active directory, Local DNS, Exchange server, DHCP, Global catalog ) what is the minimum requirments for these servers ( in terms of CPU and Memory ) . 3- what is the best way to implement a redundant solution in a virtual environment. thank you

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• FreeNas running on ESXi - sometimes gets very slugish.

  - by Luma

  Hello everyone, I have a ESXi server (dual quad core, 8GB of DDR3 ram, 6x 1TB WD Blacks running in RAid 5 on the PErc 6/i controller. I have a 64bit freenas VM running, on this VM I keep about 200Gigs of stuff that my windows machines access. every now and then the throughput of this VM just dies, for example right now it can't even handle streaming a song and when I tried to transfer a folder the speed goes from 10-400KB/s. Might I add at this point that the ESXi box has dual gigabit network cards plugged into a good solid gigabit switch and other linux and windows VM's are just fine I have seen speeds over 90MB/s (frequently) The server still has ram left over (plenty actually) and cpu is very low (500-1000mhz) any ideas what could cause this? thanks. Luc

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• Parameters for selection of Operating system, memory and processor for embedded system ?

  - by James

  I am developing an embedded real time system software (in C language). I have designed the s/w architecture - we know various objects required, interactions required between various objects and IPC communication between tasks. Based on this information, i need to decide on the operating system(RTOS), microprocessor and memory size requirements. (Most likely i would be using Quadros, as it has been suggested by the client based on their prior experience in similar projects) But i am confused about which one to begin with, since choice of one could impact the selection of other. Could you also guide me on parameters to consider to estimate the memory requirements from the s/w design (lower limit and upper limit of memory requirement) ? (Cost of the component(s) could be ignored for this evaluation)

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• How many VPS' can I create on my server?

  - by user197692

  I need to create as many VPS's on my dedicated server (KVM or OpenVZ) in order to sell them but I really don't know the answer. RAM calculation is simple, it's more about CPU resources, how many VPS's can hold. I'am talking about Intel i7-2600 (4 cores, 8 Threads). I need to deploy as many VPS's. It's all about the nr threads? i.e. 8 threads = maximum 8 x 1vCPU or maximum 4 x 2vCPU? I'am planning to use 1Gb and 2Gb memory on each VPS, the server has 16Gb (but I can raise RAM if need it. So, can I create 8 KVM VPS's with 4 vCPU and 2Gb ram each ? How about 20 VPS's with 1Gb ram and 4vCPU each? How is this decision affected by the hypervisor (KVM, OpenVZ, VMware)?

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• failure daemon and changing pid number

  - by Alessandra Bilardi

  proftpd, sshd and apache processes run with /etc/init.d/its-script on linux distro. I was monitoring 21, 22 and 80 ports with farm monitoring service: every 5 minutes service check each port and notify only failure. The failures were 5-6 times on 24h. It seems that someone kicks the switch sometimes.. I add monit and collectd monitoring and the monitoring about 21, 22 and 80 ports is every 1 minute. I do not receive farm monitoring service notify. I receive only monit notify about failure and/or succeed/changing pid number of proftpd, sshd or apache process. The failures are still 5-6 times on 24h. collectd monitoing about cpu, load average and each process is regular and there are no peaks. There is nothing kicks the switch but there is something which determines failure monitoring. is it a simple interference or is it indicative of some abnormality? What could cause these failures?

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• Solaris TCP/IP performance tuning

  - by Andy Faibishenko

  I am trying to tune a high message traffic system running on Solaris. The architecture is a large number (600) of clients which connect via TCP to a big Solaris server and then send/receive relatively small messages (.5 to 1K payload) at high rates. The goal is to minimize the latency of each message processed. I suspect that the TCP stack of the server is getting overwhelmed by all the traffic. What are some commands/metrics that I can use to confirm this, and in case this is true, what is the best way to alleviate this bottleneck? PS I posted this on StackOverflow originally. One person suggested snoop and dtrace. dtrace seems pretty general - are there any additional pointers on how to use it to diagnose TCP issues?

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• sound clipping in windows 7 64bit

  - by Sonic Soul

  something is up with 64 bit version of windows 7. i have 2 (good pro-sumer) sound cards which i've used in other version of windows 7 w/out problems, but now it is causing severe clipping (noise, sound having little gaps surrounded by static).. the cards i am using is echo mia, and native instruments audio kontrol 1. the audio kontrol 1 is a external card, and would work ok for a few hours after rebooting, and than it would go back into clipping mode, to the point where you tube videos would not play from trying to process sound and it stopping for extended periods of time. echo mia is performing better, but there is still some clipping and distortion. the machine i use is newly built, with i7 920 64 bit cpu, 6 gigs of ram and an outdated nvidia video card (geforece 7950 gx2)

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• MBP becomes very hot after using Xcode

  - by Globalhawk

  Hardware: MBP early 2011 version OS: Mountain lion App: Xcode 4.5.2 Problem: Every time when I start Xcode, 2 or 3 processes called "git" start running. But when I quit Xcode the "git" process won't quit and are still using a lot of CPU. Then the computer becomes quite hot and the battery gets drained very quickly. If I manually kill these processes the problem is gone. I tried to reinstall Xcode several times but the problem comes back every time. It drives me crazy. Any help will be appreciated!

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• Clear / Flush cached memory

  - by TheDave

  I have a small VPS with 6GB RAM hosting a couple of websites. Recently I have noticed that my cached memory size is quite high - see below: Cpu(s): 0.1%us, 0.1%sy, 0.0%ni, 99.1%id, 0.0%wa, 0.2%hi, 0.4%si, 0.0%st Mem: 6113256k total, 5949620k used, 163636k free, 398584k buffers Swap: 1048564k total, 104k used, 1048460k free, 3586468k cached After investigating if there is some method to have this flushed or cleared I stumbled upon a command which is: sync; echo 3 > /proc/sys/vm/drop_caches I read it could be useful to add this to a chron-task/job. Is this method recommended or could this lead to potential problems? The only concern I have is that I use one Magento installation on Memcached - could this have any negative effects on it? I am certainly not a pro therefore I would very much appreciate some expert advise. PS: My VPS runs on CentOS 5 x64 and I have WHM + NGINX installed.

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• Printer Brother DCP-110C Linux 64-bit drivers

  - by Ondra Žižka

  Hi, I need 64-bit Linux driver for DCP-110C (for Ubuntu 10.04 64-bit) I found only 32-bit here. http://welcome.solutions.brother.com/bsc/public_s/id/linux/en/index.html I've tried to follow those instructions. During the installation, I got this: ondra@ondra-doma:~/Downloads$ sudo dpkg -i --force-all dcp110clpr-1.0.2-1.i386.deb dpkg: warning: overriding problem because --force enabled: package architecture (i386) does not match system (amd64) (Reading database ... 257283 files and directories currently installed.) Preparing to replace dcp110clpr 1.0.2-1 (using dcp110clpr-1.0.2-1.i386.deb) ... Unpacking replacement dcp110clpr ... Setting up dcp110clpr (1.0.2-1) ... ln: creating symbolic link `/usr/lib/libbrcompij2.so.1.0': File exists ln: creating symbolic link `/usr/lib/libbrcompij2.so.1': File exists ln: creating symbolic link `/usr/lib/libbrcompij2.so': File exists After installation, the printer is listed at the cups server, but does not work (no command has any effect on printer (which is, of course, on and connected)). Anyone has found some working solution? Thanks, Ondra

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• Lightweight monitoring for a Windows XP laptop

  - by kazanaki

  Hello I have a windows XP laptop in a remote location. I would like to have an overview for CPU/Memory statistics from a remote location. Monitoring a specific service (a Tomcat instance) would be nice but not essential. I have seen the monitoring solutions (Nagios, cacti e.t.c) and they are all very heavy. I do not want to install mysql, web server and other stuff like that on the laptop. I don't even need a web solution at all. It could just be a simple command line app with a server port and on my machine another GUI application would connect there (and not a web browser) Is there something like this available?

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• How do i mitigate DDOS attacks on static servers?

  - by acidzombie24

  Here is a slightly different take on DDOS attacks. Rather than a server with dynamic content being attack i was curious how to deal with attacks on servers with STATIC CONTENT. This means cpu tends to not be an issue. Its either bandwidth or connection problems. How would i mitigate a DDOS attack knowing nothing about the attacker (for example country, ip address or anything else). I was wondering is shorting the timeout and increasing amount of connections is an acceptable solution? Or maybe that is completely useless? Also i would limit the amount of connections per IP address. Would the above help or be pointless? Keeping in mind everything is static checking for multiple request of the same page (html, css, js, etc) could be a sign of a attack. What are some measures i can take on a static content server?

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• BSOD constantly with same ntoskrnl.exe error and disk indicator is frozen

  - by Sheep

  BSOD constantly and the disk indicator is frozen. Error do not happen immediately, usually an hour after boot up. Here is the Minidump: Bug Check Code = 0x00000124 Caused By Driver = ntoskrnl.exe Caused By Address = ntoskrnl.exe+4b094c Crash Address = ntoskrnl.exe+4b094c Seems to be hardware problem, but I checked RAM, no error. I have two HDs installed, system is on SSD, data is on HDD. Checked SSD with the properties-tools-error-checking , no error. Re-installed several times, still happens even after removed HDD. Configuration: SSD: Crucial M4-CT064M4SSD2 with Firmware 0009 Intel HM65 CPU: i7-2630QM The SSD is set correctly, SATA III 6Gb/s enabled, and everything worked perfectly for nearly a year.

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• Blender Render Cycles

  - by usersuper

  I get a very poor Render in cycles. Not just minor problems, but just a cloud of of black and white dots and no contour at all. I read a lot about this now and couldn't get it to work. Does anybody know how to get the settings right. Or better what do I have to pay attention to get better renders. I also tried external renderer like Lux, which increased my CPU usage to 98 % (just the default cube and clicking on Lux and load materials). Is this normal and what could i do to improve that. I have various versions of Blender (2.61,2.62,2.63) on Mac OS X. Thanks for the time.

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• Solaris disk I/O spike... which monitoring tools do I need?

  - by bonez05

  Hi all, My Solaris 10 websever / database server disk io keeps spiking at intermittent times. Using iostat -xtc 5 the reads / sec will jump from 3.0 to 1450.0 and %busy will jump to 98% The apache access log doesn't indicate anything out of the ordinary. In other words, requests aren't any higher than usual. top doesn't generate anything useful. The cpu usage is fine with mysql using about 20% and nothing else to speak of really. What monitoring tool should I be using to see what process is using excessive disk I/O? or if there are any other suggestions I'm all ears. Thanks

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• Is a ext3 Linux filesystem byte order independent

  - by Lothar

  I have a good old HP-C3700 Workstation with PA-RISC CPU here that I would like to use as a subversion server for a very large repository. I just worry what happens if the workstation dies (everybody who knows this computer knows that it is running like an Abrams tank and unlikely to happen in the next decade). I'm using Debian Linux on this system. If the mainboard dies can I just plug the SCSI drive into a PC and read the files from a normal Intel Linux PC? Which software RAID levels would be safe?

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• Unnecessary Java context switches

  - by Paul Morrison

  I have a network of Java Threads (Flow-Based Programming) communicating via fixed-capacity channels - running under WindowsXP. What we expected, based on our experience with "green" threads (non-preemptive), would be that threads would switch context less often (thus reducing CPU time) if the channels were made bigger. However, we found that increasing channel size does not make any difference to the run time. What seems to be happening is that Java decides to switch threads even though channels aren't full or empty (i.e. even though a thread doesn't have to suspend), which costs CPU time for no apparent advantage. Also changing Thread priorities doesn't make any observable difference. My question is whether there is some way of persuading Java not to make unnecessary context switches, but hold off switching until it is really necessary to switch threads - is there some way of changing Java's dispatching logic? Or is it reacting to something I didn't pay attention to?! Or are there other asynchronism mechanisms, e.g. Thread factories, Runnable(s), maybe even daemons (!). The answer appears to be non-obvious, as so far none of my correspondents has come up with an answer (including most recently two CS profs). Or maybe I'm missing something that's so obvious that people can't imagine my not knowing it... I've added the send and receive code here - not very elegant, but it seems to work...;-) In case you are wondering, I thought the goLock logic in 'send' might be causing the problem, but removing it temporarily didn't make any difference. I have added the code for send and receive... public synchronized Packet receive() { if (isDrained()) { return null; } while (isEmpty()) { try { wait(); } catch (InterruptedException e) { close(); return null; } if (isDrained()) { return null; } } if (isDrained()) { return null; } if (isFull()) { notifyAll(); // notify other components waiting to send } Packet packet = array[receivePtr]; array[receivePtr] = null; receivePtr = (receivePtr + 1) % array.length; //notifyAll(); // only needed if it was full usedSlots--; packet.setOwner(receiver); if (null == packet.getContent()) { traceFuncs("Received null packet"); } else { traceFuncs("Received: " + packet.toString()); } return packet; } synchronized boolean send(final Packet packet, final OutputPort op) { sender = op.sender; if (isClosed()) { return false; } while (isFull()) { try { wait(); } catch (InterruptedException e) { indicateOneSenderClosed(); return false; } sender = op.sender; } if (isClosed()) { return false; } try { receiver.goLock.lockInterruptibly(); } catch (InterruptedException ex) { return false; } try { packet.clearOwner(); array[sendPtr] = packet; sendPtr = (sendPtr + 1) % array.length; usedSlots++; // move this to here if (receiver.getStatus() == StatusValues.DORMANT || receiver.getStatus() == StatusValues.NOT_STARTED) { receiver.activate(); // start or wake up if necessary } else { notifyAll(); // notify receiver // other components waiting to send to this connection may also get // notified, // but this is handled by while statement } sender = null; Component.network.active = true; } finally { receiver.goLock.unlock(); } return true; }

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• Why did my laptop turn off?

  - by darenw

  Normally I can slip my running laptop into a backpack, go somewhere, and if it's no more than about half an hour later, it'll still be running. At the destination I plug in the AC power unit and all is well. I run it off of the AC unit before and after the trip, have the screen at less than full backlight brightness, and don't have any peripherals that burn power. Sometimes the wireless switch accidentally slides in the backpack, and that causes extra power to be used and the laptop dies before I reach the destination. Sad, but so be it. But sometimes the wireless switch is off, I've reached the destination in less than 30 minutes (typically 10-20 min), and I know the battery was fully charged, yet the machine is off. Is there a way to determine, after the fact, why the machine shut itself off? I'm running Linux on a fairly powerful Gateway with 4GB RAM, fancy nvidia graphics, dual core cpu, chosen more for number crunching power than battery life, but should last easily for half an hour if not an hour.

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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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• Is there a test to see if hardware virtualization (vmx / svm) are presently enabled within a Linux session?

  - by Dr. Edward Morbius

  I'm writing procedures for configuring VirtualBox support for 64-bit SMP guests, which requires hardware virtualization suppot (VTx/Intel, AMD-V/AMD). I have successfully configured this myself, however I'd like the procedure to be clear. sed -ne '/^flags/s/^.*: //p' /proc/cpuinfo | egrep -q '(vmx|svm)' && echo Has hardware virt || echo No HW virt ... shows if the CPU is capable. I've still got to go enable the feature in BIOS. Any way to test from within Linux to see that this is no or not? Thanks. (Edit: s/xvm/svm/ in title)

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• the more DVDs at the same time , the slower the burning!

  - by sajad

  hi i'm using nero to burn multi DVDs at the same time. When i burn 1 DVD at one time it takes about 8 mins to finish. but when i try to burn 4 DVDs at the same time, it takes about 40 mins! why does it take too longe to burn multi DVDs at the same time? i don't have any problem with hardware because when i'm burning dvds , less than 20 % of my cpu & RAM are in use. thx in advance.

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• Which equipments should I buy for a laboratory?

  - by Hossein Margani

  Hi every body! I want to create a network of computers for a network laboratory in a university. I want to install windows on them. What is the fastest way for doing this and also which equipments I should buy for this laboratory. I also want to use this network as a computer laboratory, operating system laboratory, programming laboratory, microprocessor laboratory, computer architecture laboratory and software engineering laboratory. I should emphasis that this is a scholastic laboratory. Thanks.

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• Asus z53 laptop overheating problem

  - by Tiberiu Hajas

  hi all, wondering if anyone encountered overheating of asus laptop ? especially the z53 model ? usually the right side of the laptop and vent in the upper corner is blowing hot air when under even minimal load, the CPU temperature can easily get to 65-70C and GPU is even above 80C. I'm using NHC (notebook health control) to set to a higher conservatory power consumption but that helps only a bit, anyone opened up the case ? wondering is require a dust clean ...etc ? I still have some warranty on it. thanks

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• Older raid controllers in raid 5 vs. Jbod and SW raid

  - by TEB

  Hi. Im in the fortunate position to have 6 Supermicro older VOD servers with the following config: Supermicro 3U case, 3xPSU Dual Xeon 3ghz P4 class cpu (5 years old.. havnt checked the exact type) 4GB Ram 3ware 9500-8 SATA controller 8 SATA SLOTS and alot of free drives. 2GB FLASH Bootdrive What im curious about is the RAID5 performance on these old beasts in HW mode vs. SW on Linux with the controller set in JBOD mode. Im thinking on using Centos 5.5 or Ubuntu or ZFS RaidZ on Opensolaris. Any tips? or reccomendations ? best regards TEB

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