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• Reducing CPU load to absolute minimum [on hold]

  - by user191338

  I have had a couple of things gone missing I believe stolen in my shared apartment and want to run my laptop constantly with a webcam attached, running webcam surveillance software to record/ take pictures when motion is sensed. Id like to take whatever steps are necessary to be able to run the laptop constantly without the fan coming on, as its quite loud and even though it will be hidden it can be heard. Thus Id like to know what steps I can take to reduce CPU to the bare minimum for the laptop to boot up and run the camera software and send images via ftp / email when necessary. I have windows 7 installed, though I can reinstall it clean. Which are the windows services can I turn off, and more extreme disabling or measures of whatever kind which I can take. The OS would need to run the camera, wifi / networking. Thanks very much for any help.

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• iTunes memory usage

  - by Jordan S. Jones

  Why does iTunes use upwards of 70 megs of ram when it is minimized to my system tray playing music? -- Update -- I understand that iTunes is a resource hog :) What I'm trying to find out, is what part of iTunes is using all that ram. Is it the music library? If I have a smaller music library, will it use less ram? Is it loading all the Album Artwork into ram for some dumb reason? Additionally, is there any recommendations on what someone could do to reduce the amount of ram it is using?

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• Reducing Loading of Advertisers Scripts

  - by HollerTrain

  I have a website (http://dev2.liquor.com) that loads very quickly when I remove the advertisers and tracking scripts our partners give us. Of course we need to reduce page load time from 6 seconds to 1 second, and I see that it is 100% all of our external js files for partner tracking, ads, etc. I have been banging my head against the wall trying to find alternate ways to load/compress/serve the multidue of js the user needs to download. I can easily compress/minify mine, but someone else's that is not on our server is becoming hard to do so. The best I can do is get a C on YSlow, and each suggestion they give me pertains to my stupid tracking js scripts! Any help would be greatly appreciated.

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• nginx static file buffer

  - by Philip

  I have a nfs which several frontend-servers are connected to for making the files stored on the nfs available for http downloads. It looks like I have problems with the way apache is serving the files, there seems to be a very small buffer or no buffer at all which results in a lot disk seeks. I did some testing with loading the whole requested file into memory at once and serve it to the client from memory. With this technique I need less disk seeks for a download stream. Since I don't want to implement this by myself for production use I thought that I could maybe use nginx for that because the documentation says that it uses buffers for static file serving. Is it possible to increase the buffer size to a few mb, if so which config parameter do I have to change for this? Has anyone experience with large buffers for static file serving? Is there a better way to reduce disk seeks?

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• sudoers security

  - by jetboy

  I've setup a script to do Subversion updates across two servers - the localhost and a remote server - called by a post-commit hook run by the www-data user. /srv/svn/mysite/hooks/post-commit contains: sudo -u cli /usr/local/bin/svn_deploy /usr/local/bin/svn_deploy is owned by the cli user, and contains: #!/bin/sh svn update /srv/www/mysite ssh cli@remotehost 'svn update /srv/www/mysite' To get this to work I've had to add the following to the sudoers file: www-data ALL = (cli) NOPASSWD: /usr/local/bin/svn_deploy cli ALL = NOEXEC:NOPASSWD: /usr/local/bin/svn_deploy Entries for both www-data and cli were necessary to avoid the error: post commit hook failed: no tty present and no askpass program specified I'm wary of giving any kind of elevated rights to www-data. Is there anything else I should be doing to reduce or eliminate any security risk?

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• Fan is spinning too fast just in Windows - software?

  - by B. Roland

  I've recently replaced my fans (CPU, GPU, and bought a CHA fan). The GPU remained the same, but I've seen it when it was spinned 2 times faster, than it usual... but it is rarely. The problem is, that the CPU fan in Windows (especially 7) spinned too much, 'cos it keeps in under 40°C, and it is spinning with 3300-3600 RPM, which is too high I think. If I swich to Ubuntu, it keeps on ~40-45°C with with 2500-2800 RPM, which is a big difference in numbers, and in noise. I'm looking for a manual fan control solution, or just reduce the Windows' multipliers of fan speed control, somehow... I was bought the new fans because of the lower noise (and it does it, but not with 3.6k RMP). Thank you!

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• How to set Laptop Brightness in Gnome and /proc on Thinkpad W510?

  - by hakre

  I can set the brightness of my laptop screen already via /proc. I can read and change the value. Now I've set the value to 33 and then I went into gnome power management and enabled the option that it should reduce the backlight brightness being on battery. That works, the screen gets darker. If I now read out the current setting from /proc it still says it's 33. So I assume that there is another node in /proc to be used to control the brightness. The node I use so far is: /proc/acpi/video/VID/LCD0/brightness I'm using the nouveau driver. With the nvida driver the brightness can not be controlled.

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• SSH and Latent Connections (e.g., satellite connections)

  - by user71494

  Most of the week I live in the city where I have a typical broadband connection, but most weekends I'm out of town and only have access to a satellite connection. Trying to work over SSH on a satellite connection, while possible, is hardly desirable due to the high latency ( 1 second). My question is this: Is there any software that will do something like buffering keystrokes on my local machine before they're sent over SSH to help make the lag on individual keystrokes a little bit more transparent? Essentially I'm looking for something that would reduce the effects of the high latency for everything except for commands (e.g., opening files, changing to a new directory, etc.). I've already discovered that vim can open remote files locally and rewrite them remotely, but, while this is a huge help, it is not quite what I'm looking for since it only works when editing files, and requires opening a connection every time a read/write occurs. (For anyone who may not know how to do this and is curious, just use this command: 'vim scp://host/file/path/here)

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• Word to GIMP pasted image too small

  - by Marcelo Cantos

  I paste an image from Microsoft Word 2010 into GIMP 2.6.10 using Edit ? Paste as ? New Image, but the pasted image is less than half-size (1280×800 down to 553×347). Pasting into an existing blank 1280×800 image makes no difference. On the other hand, pasting exactly the same clipboard entry into Windows Paint works beautifully, producing a razor-sharp 1280×800 image, and furthermore, pressing Ctrl+C in Paint, then going to Gimp and pressing Shift+Ctrl+V in Gimp produces the correct full-size image in Gimp too. Why does pasting an image directly from Word to Gimp reduce the image size? How can I make it paste the correct image size without having to go via Paint? UPDATE: I just noticed that cutting the image from Word and pasting back into the same document also loses definition. Paint must be magical.

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• How to resize a ubuntu partition to make more room for windows

  - by Jeremy

  My laptop has Windows 7 and Ubuntu 13.10 installed alongside each other. My laptop has two 225GB hard drives. I give Ubuntu 133.65GB and I give Windows 87.76GB on the same hard drive (C). My problem now is that Windows is almost out of space but Ubuntu is only using a few GB of the 133.65GB that I gave it. I want to reduce Ubuntu's partition size and give that space to increase Windows partition size. Is that any program that can to do this?

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• Material to use for computer system cover against UV and salty air?

  - by hippietrail

  I live right next to the sea and have a large window quite close to my computer setup which allows a lot of indirect sunlight to enter. I'd like to buy or make a cover for my computer system. From visiting my usual mom & pop computer shop yesterday I got the impression these might not really exist any more. If I make my own I need a material with these qualities: Block or reduce ultraviolet light which can depolymerize plastics (the sun here in Australia is much stronger than in the northern hemisphere). Block salt-laden sea air which can oxidize USB and other connectors. Not cause static electricity when covering or uncovering. Keep dust off of course (-: My setup is a laptop plugged into a wide-screen LCD with a few external drives. So I think I'd want a largish sheet to flop over the whole desk. Are such covers commonly sold these days? What material(s) should I look for which provides the listed attributes?

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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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• Can I optimize this mod_wsgi / apache file better?

  - by tomwolber

  I am new to Django/Python/ mod_wsgi, and I was wondering if I could optimize this file to reduce memory usage: ServerRoot "/home/<foo>/webapps/django_wsgi/apache2" LoadModule dir_module modules/mod_dir.so LoadModule env_module modules/mod_env.so LoadModule log_config_module modules/mod_log_config.so LoadModule mime_module modules/mod_mime.so LoadModule rewrite_module modules/mod_rewrite.so LoadModule setenvif_module modules/mod_setenvif.so LoadModule wsgi_module modules/mod_wsgi.so LogFormat "%{X-Forwarded-For}i %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined CustomLog /home/<foo>/logs/user/access_django_wsgi.log combined ErrorLog /home/<foo>/logs/user/error_django_wsgi.log KeepAlive Off Listen 12345 MaxSpareThreads 3 MinSpareThreads 1 MaxClients 5 MaxRequestsPerChild 300 ServerLimit 4 HostnameLookups Off SetEnvIf X-Forwarded-SSL on HTTPS=1 ThreadsPerChild 5 WSGIDaemonProcess django_wsgi processes=5 python-path=/home/<foo>/webapps/django_wsgi:/home/<foo>/webapps/django_wsgi/lib/python2.6 threads=1 WSGIPythonPath /home/<foo>/webapps/django_wsgi:/home/<foo>/webapps/django_wsgi/lib/python2.6 WSGIScriptAlias /auctions /home/<foo>/webapps/django_wsgi/auctions.wsgi WSGIScriptAlias /achievers /home/<foo>/webapps/django_wsgi/achievers.wsgi

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• How can I measure TCP timeout limit on NAT firewall for setting keepalive interval?

  - by jmanning2k

  A new (NAT) firewall appliance was recently installed at $WORK. Since then, I'm getting many network timeouts and interruptions, especially for operations which would require the server to think for a bit without a response (svn update, rsync, etc.). Inbound SSH sessions over VPN also timeout frequently. That clearly suggests I need to adjust the TCP (and ssh) keepalive time on the servers in question in order to reduce these errors. But what is the appropriate value I should use? Assuming I have machines on both sides of the firewall between which I can make a connection, is there a way to measure what the time limit on TCP connections might be for this firewall? In theory, I would send a packet with gradually increasing intervals until the connection is lost. Any tools that might help (free or open source would be best, but I'm open to other suggestions)? The appliance is not under my control, so I can't just get the value, though I am attempting to ask what it currently is and if I can get it increased.

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• Powershell Set-Acl fails

  - by Ulrich

  While working on a little backup script I try to change the ACL of a file using Set-Acl in Powershell 1 on Vista and always get the following error message: Set-Acl : The security identifier is not allowed to be the owner of this object. This error persists even if I go a minimal script: $acl = Get-Acl $sourcepath$file $acl |format-list Set-Acl -path $sourcepath$file -AclObject $acl Does anyone know the reason for this error? Obviously I'm not changing the ownership of the file... BTW: What I ultimately want to achieve is to reduce all access rights to ReadAndExecute. Is there maybe an easier way of doing this in Powershell? Thanks for your help! Ulrich

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• Laptop Brightness in Gnome and /proc - Thinkpad W510

  - by hakre

  I can set the brightness of my laptop screen already via /proc. I can read and change the value. Now I've set the value to 33 and then I went into gnome power management and enabled the option that it should reduce the backlight brightness being on battery. That works, the screen gets darker. If I now read out the current setting from /proc it still says it's 33. So I assume that there is another node in /proc to be used to control the brightness. The node I use so far is: /proc/acpi/video/VID/LCD0/brightness

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• Input traffic shaping

  - by whitequark

  I know that I can shape output traffic with tc or a similar tool. However, I want to shape the input traffic now—actually, I want to prioritize downloading of files of certain type through a slow lossy connection. I know the reason tc can only shape output traffic: the host itself has no direct control over the amount of input traffic. On the other hand, TCP has some measures built in it which prevent the TCP traffic from overflowing a slow connection. So, can I mangle something in TCP header so that the remote host will think my connection is slower than it thinks? Suppose that I am able to set the corresponding mark on both types of connections with iptables. Is there any way to reduce the input bandwidth of connections of first type, but only if connections of second type are present?

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• Should a MobiTex service with a highly resilient website offer content over WAP?

  - by makerofthings7

  I'm trying to offer services over the MobiTex network (also see wiki) and want to reduce double-work. I'm trying to understand if it is a good idea to WAP enable my website. Given that WAP usage is increasing (since MMS is a hybrid of SMS + WAP), and the FCC has required every operator in the 700Mhz range to implement it I'd like to fully understand if there are benefits to the technology for certain critical applications. For example, if GPRS allows SMS traffic, voice, and Data, presumably they are handled by different Gateways. If there is another gateway for WAP traffic I would think that it would act as a backup if the data gateway was overloaded. Are there resiliency benefits to using WAP on a critical website? i.e. Content delivery (push or pull)

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• Iozone: sensible settings for a server with lots of RAM

  - by Frank Brenner

  I have just acquired a server with: 2x quadcore Xeons 48G ECC RAM 5x 160GB SSDs on an LSI 9260-8i Before deploying the target platform, I'd like to collect as much benchmark data as possible, testing I/O with hardware RAID in various configurations, ZFS zRAID, as well as I/O performance on vSphere and with KVM virtualization. In order to see real disk I/O performance without cache effects, I tried running Iozone with a maximum file of more than twice the physical RAM as recommended in the documentation, so: iozone -a -g100G However, as one might expect, this takes far too long to be practicable. (I stopped the run after seven hours..) I'd like to reduce the range of record and file sizes to values that might reflect realistic performance for an application server, hopefully getting the run times to under an hour or so. Any ideas? Thanks.

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• Backlight dimming don't work

  - by Mathias

  My Packard Bell EasyNote TS11HR notebook does not have an option for dimming the display backlight. At night, my eyes begin to hurt because of the strong light from the screen. My laptop is 2-3 months old and I am sure it has worked before. When I click on the battery icon in the notification area, it says in my language (Danish): "the setting for light does possibly reduce the life of the battery". However, I cannot dim the backlight. I have tried downloading programs for dimming the screen but they only make the screen darker, instead of dimming the backlight. I have tried updating my drivers and looking in the BIOS for a setting. I also plan to use an Ubuntu LiveCD to try controlling it. As of now though, the backlight is locked at maximum. Any ideas?

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• encoding movies for the web

  - by ELS

  Hi All, I have a friend that hosts his website on IIS and Windows Server 2003 R2 32-bit. He has .WMV files and .MPG and others and some of these are 30 mb in size! He wonders why users complain the site is slow! So my question is how can we reduce the size of these movies? What software? What settings for bit-rate, etc? Is there free software? I can use either a Mac or a PC. Thoughts are appreciated.

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• Hadoop Rolling Small files

  - by Arenstar

  I am running Hadoop on a project and need a suggestion. Generally by default Hadoop has a "block size" of around 64mb.. There is also a suggestion to not use many/small files.. I am currently having very very very small files being put into HDFS due to the application design of flume.. The problem is, that Hadoop <= 0.20 cannot append to files, whereby i have too many files for my map-reduce to function efficiently.. There must be a correct way to simply roll/merge roughly 100 files into one.. Therefore Hadoop is effectively reading 1 large file instead of 10 Any Suggestions??

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• Resized NTFS partition, now it wont mount.

  - by H4Z3Y

  I have had a 1.5TB drive used as an external for 6 months or so, then I decided to put it in my linux server for network storage. ntfs was being crazy inefficient so I wanted to change the filesystem to ext4. I used the ntfsresize command to reduce the partition to 650GB and that took abour 2 hours, then I deleted all of the entries in fstab like a guide told me too and created a new one the size of the ntfs partition, or, 650GB. after I modified fstab the ntfs partition would no longer mount and when plugging it in to windows it says "This Hard Drive needs to be formatted". any ideas on how I can recover the data off of the drive? I have 600GB of free space on a different drive so I just need some way of copying them off.

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• Configuring memcached for a particular scenario

  - by pradeepchhetri

  I have a web application which queries opentsdb server(which in backend using Hbase cluster) for the datapoints of different metrics and using dygraph javascript graphing library, I am plotting those metrics. Since getting all the datapoints of past one day from opentsdb for a particular metric is itself taking nearly 2 seconds, my application which is plotting nearly 25 metrics is becoming very slow. In order to reduce this latency, I am thinking of using memcached module of php5 for caching all the queries. But I have few questions regarding memcached. Is there any way I can configure memcache to keep on updating its cache in the background by running some command line queries after particular interval of time. Is there any way I can configure memcache to always reply for a query using cache instead of first updating its cache because my application just plots datapoints for past one day. Missing out some datapoints is not that critical.

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• High CPU Steal percentage on Amazon EC2 Instance

  - by Aditya Patawari

  I am experiencing high CPU steal percentage in a Amazon EC2 large instance. I know it means that my virtual CPU is waiting on the real CPU of the machine for time. My question is that what can I do to reduce this percentage and get maximum out of the CPU? Steal percentage is consistently at 20%. System load crosses 10 when this happens. I have checked memory and network and I am sure that they are not the bottleneck. Is that normal for such environment? Also are there any system level optimization techniques for reducing steal percentage form the virtual instance? avg-cpu: %user %nice %system %iowait %steal %idle 52.38 0.00 8.23 0.00 21.21 18.18

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