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• Is there a limit on the number of USB external drives?

  - by Beska

  I've got three external HDDs, all My Books, 500 GB, 750 GB, and 1 TB. If I hook one or two of them up to a computer, everything seems fine. If I hook all three of them to a computer (I've tried this on two different computers, one running Windows XP, one running Windows Vista), the bootup time goes up by more than an order of magnitude. It can suddenly take about 10-20 minutes to boot the machine, whereas before it might take a minute. All three drives work fine on their own. I'm not using any kind of hub; all three are plugged directly into the machine. Is this associated with some kind of inherent limit in USB? Is this bad hardware design in the CPU box? Is this a My Book problem?

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• How can I optimize ubuntu desktop to run my webserver

  - by Parry

  Hi, I am using ubuntu desktop edition to run My drupal website on Intranet. I know for running web servers best thing to install is ubuntu server editions, but due to some problem i am using Desktop edition. I installed XAMPP on my machine an my website is up and running. I want to know how can i optimize my machine?? Since I will not use very less features of desktop editions are there any things which I can remove or stop which will free memory and cpu consumption, are there any packages which i should install to increase the performance of my ubuntu??

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• What are possible causes of keyboard lag on my desktop machine?

  - by Jer

  I am running Windows 7 and began experiencing keyboard lag in most applications, and it seems to be getting worse. Certain websites are the worst - on some, I can type a sentence, take my hands off the keyboard, and watch the characters continue to appear on the screen for several seconds. Others are not as bad, but still noticeable and annoying. I just started noticing it in non-browser applications (e.g. Outlook) as well. I've disabled all extensions in Firefox, rebooted my machine, and that did nothing. There is nothing using much memory or cpu cycles, even when the lag is occurring. This is a machine at work with very strict controls over what can be installed, so the chances of any kind of malware are very slim. I don't believe anything as been installed since before the problem started. What could be causing this, and/or what can I do to debug?

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• Am I using too much memory? (Rails on EC2 with Resque)

  - by Stpn

  I am looking at the memory usage of the Rails application (it uses background processes via Resque) and since the common answer to the question, "how many workers is too many" was "test and see", I ran some memory commands and wonder if someone can help figuring if the memory usage is high enough already, or I can still add some extra workers.. so (this is all under the maximum load): $ free -t -m total used free shared buffers cached Mem: 1756 1532 223 0 12 229 -/+ buffers/cache: 1291 464 Swap: 895 10 885 Total: 2652 1543 1108 $ vmstat procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 0 0 10588 156172 13400 326476 1 6 4 0 5 4 1 0 99 0 If there is any extra info I can provide to help answer this, I would be happy to do so. If the question is strange in some way, please let me know I'd be glad to fix etc..

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• Using VLC to Unicast High Definition Webcam over local gigabit LAN with low/zero delay

  - by Robin Day

  We're setting up a webcam "window" between two offices in the same buildilng. The two PC's are connected to the same gigabit switch. We're using VLC to stream the webcam over HTTP using the following commands. vlc dshow:// :dshow-caching="0" :dshow-size="640x480" :sout=#transcode{vcodec=h264,vb=0,scale=0}:http{mux=ffmpeg{mux=flv},dst=:8080/} :no-sout-rtp-sap :no-sout-standard-sap :ttl=1 :sout-keep vlc http://192.168.0.1:8080 :http-caching="0" Even with the caching set to zero, the delay in the image is a good 2-3 seconds. The CPU usage of each pc is also maxed. I'm guessing it's the transcoding that's causing much of the delay. Can anyone give me some changes to these command lines that will reduce the transcoding power, or send the webcam over a different protocol, or anything that will reduce the delay of the cameras? Bandwidth is not an issue at all as the pc's can be connected to a dedicated switch/vlan if required.

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• High frequency, kernel bypass vs tuning kernels?

  - by Keith

  I often hear tales about High Frequency shops using network cards which do kernel bypass. However, I also often hear about them using operating systems where they "tune" the kernel. If they are bypassing the kernel, do they need to tune the kernel? Is it a case of they do both because whilst the network packets will bypass the kernel due to the card, there is still all the other stuff going on which tuning the kernel would help? So in other words, they use both approaches, one is just to speed up network activity and the other makes the OS generally more responsive/faster? I ask because a friend of mine who works within this industry once said they don't really bother with kernel tuning anymore-because they use kernel bypass network cards? This didn't make too much sense as I thought you would always want a faster kernel for all the CPU-offloaded calculations.

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• Server monitoring for medium scale UNIX network

  - by nbartolomeo

  I'm looking for suggestions for a good monitoring tools, or tools, to handle a mixed Linux (RedHat 4-5) and HPUX environment. Currently we are using Hobbit which is working reasonably well but it is becoming harder to keep track of what alerts are sent out for what servers. Features I'd like to see: Easy configuration of servers. The ability to monitor CPU, network, memory, and specific processes I've looked into Nagios but from what I have seen it won't be easy to set up the configuration for all of our servers ~200 and that without installing a plugin into each agent I won't be able to monitor processes.

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• Does disabling BIOS shadowing increase free RAM space?

  - by user32569

  Hi, I know in these days this is very stupid question, but for study purposes. I read that when PC starts, CPU is set to read adress just under the 4GB. There should BIOS be mapped to by memory controller. My question is, in old days, had disabling BIOS shadowing actually freed some RAM for you? I mean, even when BIOS was not shadowed to RAM directly, still adresses for BIOS MMIO access were wasted. And when you cant adress it, its like there is no extra space gained.

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• Home movie video browser

  - by Jim Hunziker

  I have a bunch of home movies that don't have useful filenames because they came straight off the camera. (I'm using Vista 64, by the way.) Picasa is pretty good for browsing through them and watching them, but it doesn't use my video card for rendering the videos. My CPU gets pegged at max usage, and full screen barely works. Windows Media Player or Quicktime works fine. Is there another application (like Picasa) that can be used for browsing through movies that both uses my video card and shows thumbnails of all the movies in my collection? I'd rather have something nicer than Windows Explorer. (The movies are h.264 AAC 1280x720.)

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• Setting up Ubuntu Server for hosting Java web applications

  - by Denis Hoss

  I'm trying to set up an Web Server running Ubuntu server to host some Java web applications, with MySQL running on it, an so on .. here is the tutorial I follow: perfect server ubuntu 11.10 The server configuration is: CPU S1155 INTEL Pentium G850 2.9GHz VGA 5GTs 3MB 65W MB Gigabyte GA-H77-D3H Ram 4x4Gb HDD 5x1TB Seagate (4 in RAID5 and 1 for Backup) The problem is that when I am trying to install the Server version of Ubuntu, when the installer asks me whether to activate ATA RAID Devices, and I click yes, he sees only that one, if I click no, he sees all 5 HDD's separate without any RAID, is this normal? I also tried to install the Desktop version on RAID5, but after restart, Ubuntu does't want to boot up, an underscore stands on the top of the screen. I am a newbie in servers and their configuration, in fact I am developer. I need a help from you guys.

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• Network monitoring library, or objects, for a cloud

  - by Andrew Smith

  I am looking for library to support server / switch monitoring, to actually be able to check with the device if it's working OK. However this requires some sort of auto-detection and device support. Basically I need to automatically detect a new device, start monitoring it like CPU and PING. So how do I auto-detect the machine remotely, this is something I need library for. Rackspace has something like this - "Cloud Monitoring API". But is there anything opensource which can be used same way? The Nagios and others doesnt have such API, and the big and expensive systems are too big to handle in public cloud, so there must be some other network monitoring engine with API, which can add a new servers automatically and support user isolation for example so I dont see other servers except mine.

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• Why does Windows 7 x64 work faster than an x86 edition on my PC?

  - by Jasper

  Why does Windows 7 x64 work faster than an x86 edition on my PC even though I mostly use x86 things in it? What's wrong with me, and what am I missing? Majority of the things I use is x86 (e.g. DAWs, games, media players). A considerable amount of them, however, are x64 (although their x86 counterparts work just fine). I've tried using the same things on the same system but always ended up finding Windows 7 x64 working slightly faster than x86. I'm very observant. I even notice the tiniest window animations. System: Windows 7 Ultimate x64 CPU: Intel Core 2 Duo E7500 @ 2.93 GHz RAM: 2 GB x 2 = 4 GB DDR2 @ 332 MHz Motherboard: Intel D945GCNL Graphics: ATI Radeon HD 4350 @ 1 GB Dedicated Audio: M-Audio FastTrack Pro HDD: Samsung HD753LJ 733 GB & Samsung HD160JJ 156 GB As you can see, my system is old.

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• Tuning MySQL to consume less memory

  - by Alex

  I have a VM which has 2GB Ram, (full specs) And I am setting up a site which has one table in particular with over a million records. There's little or no usage of this particular database (perhaps once or twice a day) but simply running mysql grinds the whole server to a halt. I've looked through the top results but nothing is really denting the CPU however the memory seems to be the issue. The site isnt even live of taking requests yet. the memory situation looks like this: # free -m total used free shared buffers cached Mem: 2006 1880 126 0 3 53 -/+ buffers/cache: 1823 183 Swap: 2047 345 1702 Are there any good pointers to tune mysql to stop hogging the system memory? Thanks very much EDIT: (requested by 8bit): http://tny.cz/b41a0b12

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• Is a PCIE X1 card for USB 3.0 worth it?

  - by lelouch

  I have a portable HDD on USB 3.0, and soon I'll have a 32gb flash drive on USB 3.0 as well. My motherboard is pretty old - and the next time I'll upgrade it is when I get a new CPU/mobo/ram. Slots on my mobo: PCIE X16 - For my GTX 260 2xPCI PCIE X1 I'm considering purchasing a PCI express X1 card like this - http://www.ebay.com.au/itm/PC-Laptop-2-USB3-0-Ports-PCI-E-PCI-Express-X1-Card-New-/280772000446?pt=AU_Networking&hash=item415f50babe Now the question: What are realistic (read/write) speeds I'll get in this setup, assuming I have 1 USB 3 device connected at a time, and the bottleneck is the PCIE?

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• Custom PC won't boot Windows 7 dvd but does with windows vista

  - by M_rk

  I ordered a custom build PC. (It was assembled by the store). This is the setup Motherboard: Asrock A75 PRO4-M DVD drive: LG GH24NS90 SSD: Samsung 830 series 128GB DDR3 SDRAM: 2× Corsair XMS3 CMX4GX3M1A1600C9 (2× 4GB) APU (CPU+GPU): AMD A8-3850 Boxed I got a installation DVD for Windows 7 Professional x64 English (including SP1), but it doesn't work. I got a new one from the store and it doesn't work either. However they work on a other PC. So the DVDs aren't bad. I tried an old installation DVD for Windows Vista. Both 32 bit and 64 bit work. So the boot order and such are right and working on the new PC. Is there something I'm missing here? Any ideas on how to make it work?

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• Outlook Express hangs when selecting multiple emails

  - by Javier Badia

  I'm using Outlook Express (6, I think) on Windows XP. Lately, it has been hanging. Sometimes this happens at startup (right after the main window with all the panes loads) and sometimes when selecting many emails (sometimes as low as three emails at once, sometimes at ten, it's not a fixed number). When this happens, msimn.exe starts to use 98-100% CPU and RAM usage shoots up very quickly, reaching hundreds of megabytes in half a minute. The message pane goes gray instead of showing the message contents. As I said, this sometimes happens right after the main window loads, sometimes when selecting many emails at once. I tried backing up everything, deleting the identities, creating a new one and restoring, but this still happens.

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• Why does HDTune report better performing drives 2 months after installing them?

  - by Rolnik

  OK, so this is really weird. I ran HDTune on a newly set-up home-built computer and got the following readings from my drives in mid-November. SSD 154 MB/s RAID1 87 RAID0 198 (software installs) RAID0 98 Swap drive Today, in January, I run HDTune (same version) and get these results, in MB/s: SSD 186 RAID1 98 RAID0 241 RAID0 98 (Swap drive) Here are more details that HDTune reports on the SSD drive: HD Tune: OCZ-VERTEX Benchmark Blockquote Transfer Rate Minimum : 135.4 MB/sec Transfer Rate Maximum : 219.4 MB/sec Transfer Rate Average : 185.7 MB/sec Access Time : 0.1 ms Burst Rate : 187.3 MB/sec CPU Usage : -1.0% To get to my question: Why are my hard drives improving in performance? Most of my logical drives are in some form of RAID, except for the SSD. Will this performance ever deteriorate? Note, none of my drives are a hybrid drive that uses some form of SSD to enhance the write/reads on actual platters.

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• Asus me302c create script crash

  - by wxfred

  State beforehand: So far, only Asus me302c would crash when it creates a script. This device can create renderscript context successfully 06-03 10:12:50.509: V/RenderScript_jni(3144): RS compat mode 06-03 10:12:50.509: V/RenderScript(3144): 0x610bbfc0 Launching thread(s), CPUs 4 06-03 10:12:50.549: D/libEGL(3144): loaded /vendor/lib/egl/libEGL_POWERVR_SGX544_115.so 06-03 10:12:50.559: D/libEGL(3144): loaded /vendor/lib/egl/libGLESv1_CM_POWERVR_SGX544_115.so 06-03 10:12:50.559: D/libEGL(3144): loaded /vendor/lib/egl/libGLESv2_POWERVR_SGX544_115.so 06-03 10:12:50.619: D/OpenGLRenderer(3144): Enabling debug mode 0 06-03 10:12:52.869: D/dalvikvm(3144): Rejecting registerization due to ushr-int/lit8 v4, v7, (#19) When create a script, it crashed. 06-03 09:55:09.859: D/basefilter(26682): ===createScript=== 06-03 09:55:09.869: E/RenderScript(26682): Unable to open shared library (/data/data/xxx.xxxxxxxxxxx.xxxxxxxxx.xxxxx.xxxx//lib/librs.basefilter.so): Cannot load library: soinfo_relocate(linker.cpp:975): cannot locate symbol "_Z3dotDv3_fS_" referenced by "librs.basefilter.so"... 06-03 09:55:09.869: E/RenderScript(26682): Unable to open system shared library (/system/lib/librs.basefilter.so): (null) 06-03 09:55:09.869: D/AndroidRuntime(26682): Shutting down VM 06-03 09:55:09.869: W/dalvikvm(26682): threadid=1: thread exiting with uncaught exception (group=0x418b9e10) 06-03 09:55:09.869: E/AndroidRuntime(26682): FATAL EXCEPTION: main 06-03 09:55:09.869: E/AndroidRuntime(26682): android.support.v8.renderscript.RSRuntimeException: Loading of ScriptC script failed. 06-03 09:55:09.869: E/AndroidRuntime(26682): at android.support.v8.renderscript.ScriptC.<init>(ScriptC.java:69) 06-03 09:55:09.869: E/AndroidRuntime(26682): at xxx.xxxxxxxxxxx.xxxxxxxxx.xxxxxxxxxx.xxxxxx.ScriptC_BaseFilter.<init>(ScriptC_BaseFilter.java:41) 06-03 09:55:09.869: E/AndroidRuntime(26682): at xxx.xxxxxxxxxxx.xxxxxxxxx.xxxxxxxxxx.xxxxxx.ScriptC_BaseFilter.<init>(ScriptC_BaseFilter.java:35) 06-03 09:55:09.869: E/AndroidRuntime(26682): at xxx.xxxxxxxxxxx.xxxxxxxxx.xxxxxxxxxx.xxxxxx.xxxxxx.TeethWhiteningRSFilter.onCreateScript(TeethWhiteningRSFilter.java:19) 06-03 09:55:09.869: E/AndroidRuntime(26682): at xxx.xxxxxxxxxxx.xxxxxxxxx.xxxxxxxxxx.xxxxxx.xxxxxx.TeethWhiteningRSFilter.onCreateScript(TeethWhiteningRSFilter.java:1) 06-03 09:55:09.869: E/AndroidRuntime(26682): at xxx.xxxxxxxxxxx.xxxxxxxxx.xxxxxxxxxx.BaseRSFilter.createScript(BaseRSFilter.java:39) 06-03 09:55:09.869: E/AndroidRuntime(26682): at xxx.xxxxxxxxxxx.xxxxxxxxx.xxxxxxxxxx.RSFilterEngine.addFilter(RSFilterEngine.java:76) 06-03 09:55:09.869: E/AndroidRuntime(26682): at xxx.xxxxxxxxxxx.xxxxxxxxx.xxxxx.xxxx.BeautyActivity.changeBeautyEffect(BeautyActivity.java:277) 06-03 09:55:09.869: E/AndroidRuntime(26682): at xxx.xxxxxxxxxxx.xxxxxxxxx.xxxxx.xxxx.BeautyActivity$2.onClick(BeautyActivity.java:100) 06-03 09:55:09.869: E/AndroidRuntime(26682): at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166) 06-03 09:55:09.869: E/AndroidRuntime(26682): at android.os.Handler.dispatchMessage(Handler.java:99) 06-03 09:55:09.869: E/AndroidRuntime(26682): at android.os.Looper.loop(Looper.java:152) 06-03 09:55:09.869: E/AndroidRuntime(26682): at android.app.ActivityThread.main(ActivityThread.java:5132) 06-03 09:55:09.869: E/AndroidRuntime(26682): at java.lang.reflect.Method.invokeNative(Native Method) 06-03 09:55:09.869: E/AndroidRuntime(26682): at java.lang.reflect.Method.invoke(Method.java:511) 06-03 09:55:09.869: E/AndroidRuntime(26682): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 06-03 09:55:09.869: E/AndroidRuntime(26682): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 06-03 09:55:09.869: E/AndroidRuntime(26682): at dalvik.system.NativeStart.main(Native Method) Now, I will post some related infomation. project.properties ... renderscript.target=9 renderscript.support.mode=true sdk.buildtools=19.0.3 device info Brand: Asus Model: ME302C OS: 4.2.2 CPU: Intel(R) Atom(TM) CPU Z2560 @1.60GHz GPU Renderer PowerVR SGX 544MP Finally, by the way, the same code runs well on Galaxy s2, s4, note 2.

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• Pentium 4 Computer Won't Power Up

  - by Harvey

  I have a faulty Pentium 4 workstation with data that I would like to retrieve. Here are the symptoms & what I've done so far: Machine is totally dead. Motherboard LED is lit but that is the only sign of life. I have replaced the power supply and bypassed the on/off switch. Tried a PC Analyzer motherboard tester but didn't have any power to the card. Unpluggged the P4 cable from the motherboard, hit the on/off switch, the power supply fan comes on and I get codes from the analyzer but nothing that seems to be of any value. Machine does not boot. Will not shut down by hitting the switch. Bad motherboard or could it be a bad CPU cooling fan?

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• How do I pick a motherboard?

  - by EpsilonVector

  When building your own computer one part was always a mystery to me: the motherboard. Picking a CPU/GPU/memory is easy- you just figure out where the various chips are in the low end to high end scale, do a little market research on what current games demand, and pick the parts from their respective continuums of low-to-high-end models. A mother board is more complicated though. Its features are not as obvious as "this motherboard is faster than that motherboard". Now you need to deal with part compatibilities, bus speeds, maybe power management stuff, etc. I'm interested in a short guide for selecting a motherboard, especially- what pitfalls to avoid (for example, can bus speed become a bottleneck?). To clarify: I'm not looking for motherboard recommendations. I'm looking for guidance regarding how to evaluate the fitness of a motherboard given the rest of the computer parts.

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• 3 wire computer fan won't run continuously

  - by Ben

  I had an old computer that didn't work anymore, so I took the CPU fan out to see what I could make with it. The fan is NMB model number BG0903-B044-VTL, like this. It has three wires coming off of it, red, black, and white. I know that the white wire is usually a speed sensor. Does this wire need to be connected to something in order for the fan to run continuously? Right now when I apply power to the red and black wires (from a 9-volt battery) the fan will spin very briefly, and then slow down until it stops. The fan's motor only spins in the instant that the power is turned on, but doesn't continue, even though the power is still applied. How can I get the fan to spin continuously?

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• Automatically detecting temperature sensors on startup (Ubuntu 10.10)

  - by dpitch40

  I am very close to achieving my goal of setting up a CPU temperature graph that is displayed in the top panel of my desktop. I have the applet and have gotten it to graph temperatures, which appear to be being sensed correctly. However, my machine doesn't find its temperature sensors by default; I have to run sudo modprobe coretemp for the sensors command to work, then log off and back in before the graph applet starts displaying my temperatures. I am wondering if I can somehow tell the kernel to load the coretemp module on startup so I don't have to keep doing these extra steps. I have tried putting this command in my startup applications, but I think its need for root permission is keeping this from working. Is there a way to set up startup applications with root permission, or some other way to ensure that this module is loaded at startup? If anyone is curious, I'm running 64-bit Ubuntu 10.10 on a Lenovo G770 laptop with a Core i5 processor and the 2.6.35 kernel.

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• pdflush hanging on Amazon EBS drives when using multi-GB files - any workaround?

  - by rhh

  Hello, When I run gunzip on a 1.7GB file (which generates an 8GB file) on an EBS volume, pdflush freezes after gunzip runs and the CPU hangs indefinitely at 100% IO Wait. Here's the output from 'ps aux | grep pdflush'. Note the D status root 87 0.0 0.0 0 0 ? D 06:18 0:00 pdflush root 88 0.0 0.0 0 0 ? D 06:18 0:00 pdflush The only solution is to kill the pdflush processes. The processes don't die immediately either. This problem is repeatable and happens with new instances. I'm running 2xlarge instances and I have way more RAM free than is being used (i.e. /proc/meminfo shows 20+GB MemFree) Has anyone found a workaround to this problem in the past? Thanks for any thoughts. Robert

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• Installing VMWare Tools in Windows Server 2008 fails system startup

  - by Hoghweed

  I recently created a vmware virtual machine with windows server 2008 enterprise as Guest. My host is Ubuntu 10.04 on my Lenovo laptop. I fall into a big trouble which makes my created VM unusable after I've installed VMWare Tools. After installing tools I'm able to run the system only in safe mode. After some event manager analysis I found the issue is with drivers installed by vnmware tools. Any one has got the same issue? Is there any good practice for doing that? The configuration of vm machine is the following CPU : 1 RAM : 1020 HD : 40GB Splitted files, SCSI CD : IDE Thanks in advance

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• How to diagnose a Windows XP hard crash

  - by Jon

  I have a 64-bit Windows XP machine which has hard crashed several times today. The symptoms are that the screen just goes blank, then the reboot cycle starts. There is no blue screen and even though it is switched on, no crash dump file is created. On all occasions it has happened during a period of high CPU/memory activity. I have run a full Dell diagnostics with no failures. Any ideas how to track this down further? Thanks.

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