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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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• Uninstalling PowerShell 1.0

  - by Ddono25

  I am attempting to standardize our PowerShell deployment and usage across all servers, which involves uninstalling PS1.0/installing PS2.0 on Server 2003 machines. In searching for KB926139 through CMD and Control Panel Add/Remove Programs, it is nowhere to be found. We have KB926141 installed on these servers as the Language Pack update, but no initial Install Update. PowerShell 1.0 is installed on the server and can be found at the default locations (%windir%\System32\WindowsPowerShell\V1.0, %windir%\Syswow64\WindowsPowerShell\V1.0). I would like to avoid deleting the Registry Entry in this situation since it should be pretty simple, any help would be appreciated. Thanks!

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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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• 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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• Will SSD degrade when running VMWare Workstation from SSD?

  - by Andrey Botalov

  My main OS (Windows 7 or 8) is runned from SSD. I'd want to run Mac OS X 10.7 or 10.8 using VMWare workstation. I've heard that VMWare doesn't support TRIM and other things to optimize SSD usage. So SSD will quickly degrade if VM will be runned from SSD. Will it be better to put guest OS's files (.vmdk and the rest) to external HDD (connected through USB 2 or 3) instead of SSD? What advantages and disadvantages it will give? What if VM will be put to internal HDD? At what drive type performance of VM will be better?

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• How much CPU use is too much?

  - by Jonathan Sampson

  I've got a server that receives around a million unique visitors a month and I've recently began using Plesk to help monitor some of the vitals on the box itself. RAM I can make sense of, but I'm not really sure if my CPU usage is too high, low, or about average for this number of visitors. The server exists solely to serve up a somewhat hefty WordPress blog. This is one week. What types of things should I look out for? Some other information about this server follows: VCPU(s): 4, RAM: 6GB, HDD: 30GB, OS: Ubuntu Server 10.04 x86_64

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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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• SIP Service to record all calls?

  - by TK Kocheran

  I read an article that I can't find at the moment which detailed a way to have Google Voice point to a SIP phone number which forwards to your phone in order to take advantage of the SIP service in order to Have all calls use a data connection = no usage of cell-phone plan minutes. Record each and every conversation.* I really want to be able to accomplish this, primarily issue number 2, as all of the phone recorder tools in the Android Market essentially don't work for my Nexus One. I figure that I have one of two options with this. I could 1) use an existing (hopefully free) service which will do this for me or 2) I could set up a SIP service at my home. to somehow forward calls through my home server which will record the calls as well as forward calls to my cell phone. Obviously, the path of least resistance is the one I'd like to go down. Can anyone help me out with this? * I do understand that the legality of this varies from state to state here in the US.

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• why need select privileges on *.* to use view?

  - by profy

  I have a problem using view with MySQL server 5.0 (5.0.92) I cannot use view with a user granted like that : GRANT USAGE ON *.* TO 'testuser'@'' IDENTIFIED BY PASSWORD '**********'; GRANT ALL PRIVILEGES ON `testuser`.* TO 'testuser'@''; I can create view, but when I try to select in, I have this messages : ERROR 1356 (HY000): View 'testuser.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them I need to "GRANT SELECT ON . TO 'testuser'@''" to make select working on the view. Why ? Do you know a solution to use VIEW's without the select privileges on . ? Thanks a lots for your answers.

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• C# performance varying due to memory

  - by user1107474

  Hope this is a valid post here, its a combination of C# issues and hardware. I am benchmarking our server because we have found problems with the performance of our quant library (written in C#). I have simulated the same performance issues with some simple C# code- performing very heavy memory-usage. The code below is in a function which is spawned from a threadpool, up to a maximum of 32 threads (because our server has 4x CPUs x 8 cores each). This is all on .Net 3.5 The problem is that we are getting wildly differing performance. I run the below function 1000 times. The average time taken for the code to run could be, say, 3.5s, but the fastest will only be 1.2s and the slowest will be 7s- for the exact same function! I have graphed the memory usage against the timings and there doesnt appear to be any correlation with the GC kicking in. One thing I did notice is that when running in a single thread the timings are identical and there is no wild deviation. I have also tested CPU-bound algorithms and the timings are identical too. This has made us wonder if the memory bus just cannot cope. I was wondering could this be another .net or C# problem, or is it something related to our hardware? Would this be the same experience if I had used C++, or Java?? We are using 4x Intel x7550 with 32GB ram. Is there any way around this problem in general? Stopwatch watch = new Stopwatch(); watch.Start(); List<byte> list1 = new List<byte>(); List<byte> list2 = new List<byte>(); List<byte> list3 = new List<byte>(); int Size1 = 10000000; int Size2 = 2 * Size1; int Size3 = Size1; for (int i = 0; i < Size1; i++) { list1.Add(57); } for (int i = 0; i < Size2; i = i + 2) { list2.Add(56); } for (int i = 0; i < Size3; i++) { byte temp = list1.ElementAt(i); byte temp2 = list2.ElementAt(i); list3.Add(temp); list2[i] = temp; list1[i] = temp2; } watch.Stop(); (the code is just meant to stress out the memory) I would include the threadpool code, but we used a non-standard threadpool library. EDIT: I have reduced "size1" to 100000, which basically doesn't use much memory and I still get a lot of jitter. This suggests it's not the amount of memory being transferred, but the frequency of memory grabs?

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• When adding second processor to SQL Server, will it automatically balance the load?

  - by ddavis

  We have a SQL Server 2008 R2 (10.5) on a dedicated box with a single 2.4Ghz processor, which regularly runs at 70-80% CPU. We are going to be adding a significant number of users to the application and therefore want to add a second processor to the box (scale up). Will SQL Server automatically use the second processor to balance threads, or is there additional configuration that will need to be done? In other words, will adding the second processor drop my CPU usage to 35-40% per CPU, automatically balancing the load? Based on what I read here, it seems that it will: http://msdn.microsoft.com/en-us/library/ms181007.aspx However, I've read elsewhere that CPU performance gains can be made by assigning database tables to different filegroups, but I'm not sure we want to get that complicated at this point.

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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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• How can I tell if my live web-server is overloaded?

  - by Nick G

  We have a live webserver which doesn't seem to be performing all that well. It's a Dell PowerEdge machine, a few years old (dual core, 4GB) which is hosting about 20 low-traffic websites. However it doesn't seem to be as fast as it used to be. How can we determine the cause of this? If it's website traffic, I would be expecting high CPU but CPU usage is quite low and hovers around the 15-30% mark except for very brief periods. I'm wondering perhaps, if rather than CPU performance being a problem, perhaps it's disk thrashing due to the constant read/writes of all the small web files and database queries. It has 4x 7200 RPM SATA drives in RAID 5. So is there a way to check that it's not disk thrashing?

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• Safari 7 SSL error if using IP-adress

  - by K. Biermann

  I have created my own CA for internal usage and set the root certificate to trustworthy on my machines. With this CA I signed the SSL-certificates for my internal servers. I only address them with their IP and so I used the servers' IP as certificate name. If i connect to the Servers with Chrome or mobile Safari it works without problems, but if I use Safari 7 under Mavericks (on the same machine with the same keychain) i get the following error: "The certificate is not valid (host name mismatch)". I double checked that I entered the correct IP ("https://192.168.2.130"), but I always get the same error. Do I need to enter a different name for the certificate or is it just that Safari doesn't support SSL certificates for IPs? Here is a screenshot of the error message (I can only post images with at least 10 rep): Safari's error message Thanks in advantage and please excuse my bad English :D

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• How to empty a project created by svnadmin create /svnroot ?

  - by apache

  I want to clear all files checked into the repository /svnroot Is there a way to do this? I don't find a possible command to do this: [secret@vps303 ~]# svnadmin --help general usage: svnadmin SUBCOMMAND REPOS_PATH [ARGS & OPTIONS ...] Type 'svnadmin help <subcommand>' for help on a specific subcommand. Type 'svnadmin --version' to see the program version and FS modules. Available subcommands: crashtest create deltify dump help (?, h) hotcopy list-dblogs list-unused-dblogs load lslocks lstxns pack recover rmlocks rmtxns setlog setrevprop setuuid upgrade verify

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• bottle.py on EC2 micro instance causes 2 order of magnitude slowdown

  - by user61633

  Cross-posted from StackOverflow: I wrote a little toy script to solve this type of game, and put it on my new micro EC2 instance. It works perfectly, but while it takes around 0.5 seconds to run a local version, and takes under 0.5 seconds to run both the local and the bottle.py version on my home computer, running the bottle.py version on the EC2 instance takes over 2 minutes. Python has the cpu pegged at 99% the entire time. Only 7.4% memory usage, consistently, and no swapping. The only guess I have is initialization time for bottle.py on EC2, but if it were that, why would it be ~200x faster on my own computer with bottle.py?

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• How can I restrict my mates to stop downloading?

  - by user239295

  We are sharing an internet broadband connection with 6 users at a place we live. We get 20 gb fup ( Fair usage policy) with 2 mbps speed from the ISP after the 20 gb is consumed the speed comes down to 512 kbps very difficult to browse any page. The problem is we cannot track which user/mate is downloading and ending the FUP. it is very difficult to track so is there something that we can allot per user some amount of space like 2 gb of downloading or restrict all from downloading so that we can utilize all the fup till the end of the month. We are using this connection as wifi configured. A adsl router is configured as wifi and we all using all 6 laptops. No PC. Any help would be appreciated. I apologize if i am not clear with my question.

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• How to configure in crontab with condition statement for checks

  - by chz

  We like to monitor the NAS storage mounted on a linux box. We only like to be notified via mail when the usage exceeds a certain number say 80. We have only seen in linux books where most of them are calling shell scripts at certain times. How do we write inside crontab to only mail us if it exceeds 80 ? Usual eg 2 2 * * * /home/someUser/script.sh 2&1 | mail [email protected] Looking for solution like below 2 2 * * * if [ someNumber "80" ] ; then /home/someUser/script.sh | mail [email protected] Sincerely

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• How do you interpret `strace` on an apache process returning `restart_syscall`?

  - by indiehacker

  We restart an apache server every day because RAM usage reaches its limit. Though of value See this serverfault answer, I dont think lowering the MaxClients in the apache configuration is a solution to the unknown root problem. Can you make sense out of the below data? Below is an extract of what $top with M returns: 20839 www-data 20 0 1008m 359m 22m S 4 4.8 1:52.61 apache2 20844 www-data 20 0 1008m 358m 22m S 1 4.8 1:51.85 apache2 20842 www-data 20 0 1008m 356m 22m S 1 4.8 1:54.60 apache2 20845 www-data 20 0 944m 353m 22m S 0 4.7 1:51.80 apache2 and then investigating a single process with $sudo strace -p 20839 returns only this one line, which is cryptic, for me: restart_syscall(<... resuming interrupted call ...> <unfinished ...> Any insights? Thanks.

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• Workstation Build: Single 2.66ghz i-7 with overclock potential, OR Dual 5520 2.26ghz Xeons?

  - by jdc0589

  There are probably better places to ask this, but I am used to the excellent quality of responses on stack overflow. I am rebuilding my desktop in a few months. Aside from normal lightweight internet usage, I use it to run sqlServer, mySql, 1-2 Ubuntu VMs from time to time, lots of IDE's, and a media server for my PS3. The two possible setups cost the exact same amount (within $50) and would both have 12gb 1333mhz ddr3 ram and a 500gb RAID-0 array (250x2). Now, If I go with a single i-7 920 2.66ghz quadcore, I can easily overclock it to 3ghz, and would have cash leftover to get a 160gb ssd (either the ocz vertex or the 120gb intel) for the main OS/Program install drive. Else, I could get a dual lga1366 motherboard with two e5520 Xeon's (2.26ghz),just use the disks I already have. So, do I go for 8 physical/16 virtual cores at 2.26ghz (No overclocking on server boards) with normal disk I/O, or a 4 physical/8 virtual cores at 3.0ghz with really outstanding disk I/O?

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• VPS showing low disk space despite there is nothing major on it

  - by SheoNarayyan

  Hello experts, On my VPS server I was trying to see the used disk space and when I open My Computer it shows 17.9 GB free out of 39.8 GB it means that 21.9 GB space is used. However, when I select all files and folders from C: and try to see the total size, it just count approximately 11 GB. The difference is around 10 GB. Where is this 10 GB going if I have not stored anything else here? I asked above question from my VPS provider and he responded below Check hidden files/system files/etc. This is default windows OS and its utilization and not specific to setup. If you want specifics of usage, you can go ahead and get in touch with Microsoft support team and they'll provide you with exact specification of the same. I am sure that Windows OS must not be taking up 10 GB space for hidden files and folders. My VPS has Windows Server 2008 R2 installed. Can anyone help me in this on who is right?

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• Looking for an open source real-time network analysis program

  - by JrSysAdmin

  Can somebody recommend an open source real-time network analysis program? What I'm looking for the program to do is display a graph of bandwidth usage by IP within our internal network that can quickly be viewed any time we need to (typically when we want to quickly find out who is utilizing high amounts of bandwidth and slowing down the network). We ideally simply want to hook up a monitor on the wall of our server room to a system whose NIC will be in permissive mode to log all network activity in a visual manner which can easily be seen and running 24/7. Prefer open source as I do not have a budget for this project and prefer open source projects in general. I'd also prefer for this to be available for CentOS but any linux distro or Windows OS would be acceptable. Thanks!

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• Reducing storage cost by moving old files to external USB HDDs. Your thoughts?

  - by cparker4486

  I've got about 300GB of pictures and marketing data that is rarely accessed and I'd like to get it off my main storage. I was thinking to simply add two external USB HDDs to the server and move all the files to one of the drives. The second drive would be the backup destination for the first drive. I'm working with Server 2003 R2 SP2. This will help me free a good amount of space on my main storage as well as reduce the complexity, backup window, and usage of my backups to tape.

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• What is the 'cacert.pem' and for what to use that?

  - by user65567

  I am developing a web application on localhost with domains and sub-domains and I would like to use a HTTPS connection. On my Mac OS, in order to enable SSL, I need to set Apache correctly, so I followed some guide to accomplish part of that. Now it is time to choose a certificate in order to test HTTPS requests. I seen the cacert.pem, but I don't know how to use that and for what it is used (can you explain to me some about its usage?)... So, is it possible to use the cacert.pem (see the link) for all my domains and subdomains (maybe, as a wildcard certificate) on localhost? If so, how to do that? What certificate I have to take and use? If no, what I need to do in order to use a wildcard certificate for all my domains and subdomains on localhost? Of course those certificates must be accepted by browsers and working for HTTPS connection between my domains.

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• How to identify who is using Hardware Reserved Memory in Windows 7

  - by blasteralfred

  I run Windows 7 x86 Home Premium. I have an installed physical memory of 4 GB, out of which, 2.96 GB is usable (My Computer Properties). I checked the memory usage using Resource Monitor and found 3036 MB / 4096 MB is available. I noticed that 1060 MB is unavailable since it is reserved by some "Hardware component(s)". I would like to know which hardware component is using this 1060 MB. Is there any way or tool to identify this? Note: I know that Windows 7 Home Premium x86 supports a maximum of 4GB RAM.

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