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• What video codecs have most amount of content and thus popular at present/in future?

  - by goldenmean

  Hi, I want to find out if I can get some data on the percentage wise distribution of video content, for different video codecs currently used for video encoding. I know there are different applications/use-case scenarios which have different encoder used but i want to consdier all that and have a overall usage number(%) My guess is(highest to lowest % of content) - H.264(AVC) DivX MPEG2 VP6 Where do H.263, MPEG4, VC-1, RV, Theora, etc. fit in here. How may this look like in future? PS:I would like this to be community wiki to have get wider range of inputs, if someone with privileges can do it for me please. thank you. -AD

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• Very Hot P4 3.4 GHz

  - by Timothy R. Butler

  My Pentium 4 3.4 GHz is running hot even with a new fan on my case's heatsink (80mm rated at ~ 40 CFM). If I stress the CPU, it goes over Intel's maximum temperature rating. I'm contemplating putting in a "PCI cooler" (i.e. a fan that fits into an empty PCI slot) to see if I could get better airflow in the case. The slot isn't far from the processor and heatpipes that lead from the processor to the fan, so I'm hopeful this would help, but not entirely certain. Thoughts?

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• video card for only watching videos

  - by Nothing 2 Lose

  I recently quit gaming so I took out my (GeForce GTX 550 Ti) video card and switched back to the (cheap) integrated card because I don't want the dedicated card using up power & making unnecessary heat/noise. But now I get lag when I watch high-res movies, or when I open several videos at the same time, but I don't want to go back to my (big/expensive) video card because that seems like overkill. What is the smallest/cheapest card which will only be good enough for watching videos without lagging ? (but not for gaming) PS. My CPU is: AMD Phenom 9850 Quad-Core Processor

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• Linux released memory

  - by user59088

  If My process allocates some big memory and then deallocates, would top or gnome-system-monitor show that my memory usage of that process decreased ? or kernel will still reserve that memory for that process ? What I see is I am deallocating memory. But I still see gnome-system-monitor displaying growing memory for my program. I don't find memory leak in my end. I want to know whether its not displaying released memory ? or there is really a memory leak at my end ?

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• df-h command in ubuntu

  - by Esha Sharma

  I am a new user of Ubuntu. When I type df -h in terminal , it gives me list of all storage devices and space usage. In my system I get this. Filesystem Size Used Avail Use% Mounted on /cow 934M 173M 761M 19% / udev 925M 4.0K 925M 1% /dev tmpfs 374M 856K 373M 1% /run /dev/sdb1 7.5G 2.8G 4.8G 37% /cdrom /dev/loop0 1.5G 1.5G 0 100% /rofs tmpfs 934M 16K 934M 1% /tmp none 5.0M 0 5.0M 0% /run/lock none 934M 76K 934M 1% /run/shm /dev/sda 299G 74M 299G 1% /media/q I understand that /dev/sda is my hard drive which is 320 gb(in gib it is 299 and hopefully that is what is being displayed) and /dev/sdb1 is pendrive of 8gb from which I am running the live cd. My question is what are the other folders and what is the physical location of these folders if complete memory is taken by the device dev/sda?

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• Linux IO scheduler on databases with RAID

  - by Raghu

  Hi, I have a linux database(MySQL) server(Dell 2950) with a 6-disk RAID 10. The default IO scheduler on it is CFQ. However, from what I have read and heard, there is no need for a scheduler like CFQ when reordering/scheduling is also done by underlying RAID controller; on the contrary since it does not account underlying RAID configuration into account performance may actually degrade with CFQ. The primary concern is to reduce CPU usage and improve throughput. Also, I have seen recommendations of using noop/deadline IO scheduler for databases primarily because of the nature of their R/W access.

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• A space-efficient filesystem for grow-as-needed virtual disks ?

  - by Steve Schnepp

  A common practice is to use non-preallocated virtual disks. Since they only grow as needed, it makes them perfect for fast backup, overallocation and creation speed. Since file systems are usually based on physical disks they have the tendency to use the whole area available1 in order to increase the speed2 or reliability3. I'm searching a filesystem that does the exact opposite : try to touch the minimum blocks need by an aggressive block reuse. I would happily trade some performance for space usage. There is already a similar question, but it is rather general. I have very specific goal : space-efficiency. 1. Like page caching uses all the free physical memory 2. Canonical example : online defragmentation 3. Canonical example : snapshotting

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• How do I log file system read/writes by filename in Linux?

  - by Casey

  I'm looking for a simple method that will log file system operations. It should display the name of the file being accessed or modified. I'm familiar with powertop, and it appears this works to an extent, in so much that it show the user files that were written to. Is there any other utilities that support this feature. Some of my findings: powertop: best for write access logging, but more focused on CPU activity iotop: shows real time disk access by process, but not file name lsof: shows the open files per process, but not real time file access iostat: shows the real time I/O performance of disk/arrays but does not indicate file or process

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• Mobile Intel 965 vs 4 Series chipset speed differences

  - by graham.reeds

  A client of ours is having a problem panning on a mapping application that we write on their panasonic toughbooks (CF-19's). One of their toughbooks the panning is fairly smooth while on the other it is really slow. Doesn't help that they have all the settings turned up, but I would of thought any reasonably new graphics card (even shared memory) would have more than adequate graphic speed. I am pretty sure that the graphic adapter is to blame, but I can't find anything out about either chipset (level of acceleration, non-problems, etc). All I get is the intel data sheets. The faster panning one is on the Mobile Intel 4 Series Express Chipset while the slower is on the Mobile Intel 965 Express Chipset. Is this expected? Does it sound like a driver problem? They both have the same amount of ram and same cpu.

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• Printing documents on HP printer very slow

  - by maxim

  I have a strange problem with HP drivers. I have configured a HP printer 2025dn with LAN connection, on 3 pc, using the cd rom of HP driver. All works well, but sometimes for certain documents the time for printing is very slow and long. I observe during this situation, in task manager, a process called rundll32.exe loads CPU at 100%. If I kill that process the printer starts printing fast the document in the queue. I wondering the reason of this strange behaviour.

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• Why has my Mac been running fsck_hfs for two days now?

  - by Nate

  I first noticed that fsck_hfs was running, taking up 50-75% of a CPU, yesterday. It continues to run today. ps shows that it is doing /sbin/fsck_hfs -f -n -x -E /dev/disk3. Only problem: I don’t think I have a /dev/disk3. Why is it running? Will it ever finish? Can I kill it? What is /dev/disk3? Could it be my Time Machine volume, which is not mounted at the moment? System Info: MacBook Pro (2008). It has two disks installed—the internal disk (/dev/disk1) and a PC Card SSD (/dev/disk0, surprisingly). It connects to a remote Time Machine volume attached to an Airport Extreme base station.

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• Deactivate GPU and use IGP

  - by squelos

  I am having some trouble with my Sony Vaio SVE1511W1e laptop. It has an ATI Radeon and the i5 has an IGP (i5 2450m). I don't often use my GPU, and the IGP would be just enough for most usage I do. Therefore, in order to improve the battery life, I wish to deactivate the GPU and use only the IGP. The problem is that my BIOS doesnt allow me to do so. But I believe it is possible to deactivate the GPU 'programatically'. I'm running Debian Wheezy on the 3.2.0.4 AMD64 kernel. The first problem I'm running into is that when I run lspci, my IGP doesnt show up. Could this be because im lacking a kernel module? (I chose a targeted installation). What are the solutions to deactivating a GPU and using an IGP on a Linux System such as debian?

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• How can I fix a computer that is literally too slow to do anything?

  - by fredley

  I'm troubleshooting a Windows 7 PC for a friend. A couple of days ago it started running 'slow'. It turns out 'slow' is about 15 minutes to the first glimpse of the desktop, and another 30 to show icons. It is possible to open Task Manager, and nothing seems awry, CPU usage at 1-5%, plenty of memory free. The machine is clearly infested with malware though, in particular a program called 'Optimizer Pro' is demanding money to 'remove 5102 files slowing down my computer'. This seems highly suspicious. My problem is though, that I can't access msconfig (I left it for a couple of hours after having hopefully typed it into the Start Menu and hit enter - nothing seems to have loaded), or anything at all basically. I can boot from a Linux Live CD, but can I actually do anything useful from there? System Restore hasn't fixed it either, and Safe Mode exhibits the same behavior.

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• Case in-sensitivity for Apache httpd Location directive

  - by user57178

  I am working with a solution that requires the usage of mod_proxy_balancer and an application server that both ignores case and mixes different case combinations in URLs found in generated content. The configuration works, however I have now a new requirement that causes problems. I should be able to create a location directive (as per http://httpd.apache.org/docs/current/mod/core.html#location ) and have the URL-path interpret in case insensitive mode. This requirement comes from the need to add authentication directives to the location. As you might guess, users (or the application in question) changing one letter to capital circumvents the protection instantly. The httpd runs on Unix platform so every configuration directive is apparently case sensitive by default. Should the regular expressions in the Location directive work in this case? Could someone please show me an example of such configuration that should work? In case a regular expression can not be forced to work case insensitively, what part of httpd's source code should I go around modifying?

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• Sending a file to uCLinux

  - by Mike

  I have a board running uClinux, and I need to send a file to it, but I'm not sure how... I have a RS232 port, and Ethernet port with an IP address at my disposal, I can telnet to the board, but uCLinux doesn't have a built in FTP client. What sort of options do I have here for transferring files from my Windows 7 (or OpenSUSE) machine(s) to this board? EDIT I just found I have a TFTP server on it: # tftp BusyBox v0.60.5 (2012.07.09-14:05+0000) multi-call binary Usage: tftp [OPTION]... HOST [PORT] But I can't find any good information on how to use TFTP. And looking around google I'm seeing it's good for loading binary images, so I'm assume anything could be sent, but I'm not sure.

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• How can I deactivate the gnome desktop of my ubuntu server?

  - by 19 Lee

  I'm running a home server on my old laptop (atom cpu). I installed ubuntu 12.04 server edition, but I also installed ubuntu-desktop. So, when I turn it on, ubuntu desktop is shown. I sometimes use GUI, but I want to turn the ubuntu-desktop (gnome-desktop) off when I don't use it. I think I can save resources by turning off the GUI. It's necessary since my laptop's performance is not very good and it often becomes very hot. I guess I can run ubuntu-desktop on my terminal with "startx" command. But, I don't know how to turn the X window off for a moment. Anybody have an idea? Thanks in advance.

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• how to debug BSOD irql_not_less_or_equal error

  - by Sev

  So I'm getting the irql_not_less_or_equal BSOD. I tried looking at the event viewer for potential causes, and cannot find any. I also checked the CPU temperature in BIOS right after the error and that was fine. I've tried 2 sets of RAM chips already, both give the issues. The error doesn't happen consistently...it happens daily, but many hours can pass and it won't happen, or only 10 minutes can pass and it might happen again. By the way, just bought the parts and built the computer myself a couple of weeks ago. How to debug the cause for this? Hardware info: Asus P6X58D PREMIUM motherboard Intel core i7 930 quad core 2.8 ghz Kingston 128 GB SSD 3 Gb/sec Nvidia Geforce GTX 465 PNY Edition Corsair 12 GB DDR3 1600 Mhz Ram Windows 7 Ultimate

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• What is a proper MySql replication configuration for frequent db updates and rare selects?

  - by serg555

  We currently have 1 master db on its own server and slave db on app server. App executes very frequent but light updates (like increasing counters), and occasional (once in a few minutes) heavy selects (which is the most important part of the app). When app was connected only to master db there were no performance issues. With slave db introduction CPU load avg on app server increased to about 6-10 during that heavy select period (from 3-4 as before). When server doesn't run those frequent updates it seems like performance for selects stays within the limits. So I have a feeling that those updates is what is causing the performance drop (also these frequent updates are not critical so if slave db doesn't have them in sync with master for some time it would be ok). What would be a good db replication setup for such kind of app? What are the replication parameters we could tweak? Thanks.

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• Is it safe to use up all memory on linux server, not leaving anything for the cache?

  - by Temnovit

  I have a CentOS server fully dedicated to MySQL 5.5 (with innodb tables mostly). Server has 32 GB RAM, SSD disks, and avarage memory usage looks like this: So about 25GB is in use and about 6.5GB is cached. I am experiencing performance problems with WRITE queries, so I was thinking, is this the optimal cache size? I might increase innodb buffer size, so that linux cache would become smaller, or decrease it, so it would be bigger. What is the optimal used/cached memory balance for busy MySQL server on linux?

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• Bad HD video deinterlacing processing

  - by Guy Fawkes

  I have Ubuntu 12.04 32-bit with Unity. My system configuration is: CPU: Core 2 Quad Q6600 (2.4 GHz) RAM: 8192 Mb DDR2 Kingston Video: Palit GeForce GTX 260 216 SP, and my screen resolution is 1680x1050. I also have Window 7 Ulitimate installed, and I can see the same files in Media Player Classic without any horizontal lines. I've installed vdpau driver, NVIDIA drivers 304.51, and MPlayer 2 (within SMPlayer). I've disabled "Sync to VBlank" option in CCSM (because in other way, by default, MPlayer process use about 50-60 percents of my processor load), tried to swich between different deinterlace options in SMPlayer, used "-vc ffh264vdpau,ffmpeg12vdpau" (without quotes) parameters for MPlayer, switched to "Ubuntu 2D", but, finally, have no results. Any suggestions? How must I to set up MPlayer?

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• Monitoring the wall time of a process on windows?

  - by Sean Madden

  Windows Task Manager has the ability to show the current CPU time of any given running process on windows, is there any way (not necessarily through Task Manager) to get the current wall time of a process? An example, let's say I have a script that reliably runs for about 45 minutes. Without adding a progress bar to the script, is there any way to figure out for how long it has been running? The math behind this seems pretty straight forward; WallTime = CurrentWallTime - WallTimeProcessStarted. Likewise, since the math is so simple, is there anyway to get the time that a process was started at?

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• Full computer freeze with audio stuttering after playing games for a period of time

  - by Wes

  I've been having a problem with my computer freezing completely when playing games like LA Noire or SW:TOR (yay early access!). Basically, what happens is I will play for around an hour or so (depending on the game) and when the freeze happens, the entire computer locks up and any audio that was being played glitches out and stutters broken-record style (only much shorter. Very techno). I think it might be heat related and thought it might be my video card overheating, so I have been setting my video card (Nvidia Geforce 260GTX 216-core) fan to highest setting, but that has little to no effect. Now I'm beginning to think it's either my FSB or CPU overheating. Can anyone provide some insight or similar experiences? I'm really at a loss and don't wanna damage my rig beyond repair.

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• Cloning Windows 2003 Server to new hard drive results in failure

  - by Level1Coder

  Scenario: Old hdd is a Seagate 320gb SATA drive New hdd is a WD 320gb SATA drive Created an exact clone and replaced old hdd with new hdd. Boot up with new hdd, it gets into Windows 2003 server environment but things look weird. Lots of system event failures in the event viewer log. System is barely unusable, critical services are all down. Boot up with old hdd, everything is fine. QUESTION: Is it possible to do a simple clone of a Windows 2003 server system? All I'm changing is the hard drive, everything else stays the same (old CPU/old mobo/etc..)

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• Is paravirtualization evil?

  - by Daniel

  I have an VMWare ESX Server v3.5 with a few virtualized Debian Lenny VMs (kernel 2.6.22 with vmi) running Apache Tomcat 5.5. I enabled paravirtualization, and Disk IO increased from about 240MB/s to 380MB/s, making me a happy admin. The problem now is that my apache tomcat becomes deadlocked during startup, running with 200% CPU (I have 2 CPUS assigned to the VM), and don't know how to get both: A stable system and a fast system. I somewhere heared that paravirtualization is legacy anyway and won't be available on newer ESX servers. Is there a replacement for this seemingly performance-improving option, or is it discontinued becauses it is just unstable? What is the state of paravirtualization? Should I ignore it completely? Thanks for all answers in advance.

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• grep only returns help text

  - by Pete Mancini

  Well, I am perplexed. I am working with an Ubuntu server and I type in grep 'bash' *.sh BUT fgrep 'bash' *.sh works like a champ. which grep and which fgrep both point to their respective executables in /bin. I am perplexed as to what I am doing wrong. EXAMPLE output: $ grep -F 'grounding' repl.clj Usage: grep [OPTION]... PATTERN [FILE]... Search for PATTERN in each FILE or standard input. PATTERN is, by default, a basic regular expression (BRE). Example: grep -i 'hello world' menu.h main.c $ fgrep 'grounding' repl.clj (p/concepts-for-grounding-term imp1 "PERSON" "summary") See? grep is failing but fgrep is working fine. That is why I am perplexed.

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