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• What is a good motherboard for the Intel i7 series processor?

  - by jasondavis

  I am lost on choosing a good miotherboard at a decent price for my Intel i7-930 CPU. I have read bad things about all of them so far. Issues with RAM not working correctly, Windows not loading with USB keyboards plugged in and all kinds of nightmare stories. Here is my needs. - 6g/b SATA 3 - USB 3.0 - Cheaper is better - Support for up to 24gb of RAM, I will start out with only 12gb though - I will use 64bit v. of Windows 7 so the 4gb RAM limit should not be a problem from my OS - Should be able to boot even if I have a USB keyboard plugged in. If you have experience with a motherboard that meets these specs, please do tell about it. I appreciate any help, I am stuck right now on picking a good board.

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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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• Linux (non-transparent) per-process hugepage accounting

  - by Dan Pritts

  I've recently converted some java apps to run with linux manually-configured hugepages. I've got about 10 tomcats running on a system and I am interested in knowing how much memory each one is using. I can get summary information out of /proc/meminfo as described in Linux Huge Pages Usage Accounting. But I can't find any tools that tell me about the actual per-process hugepage usage. I poked around in /proc/pid/numa_stat and found some interesting information that led me to this grossity: function pshugepage () { HUGEPAGECOUNT=0 for num in `grep 'anon_hugepage.*dirty=' /proc/$@/numa_maps | awk '{print $6}' | sed 's/dirty=//'` ; do HUGEPAGECOUNT=$((HUGEPAGECOUNT+num)) done echo process $@ using $HUGEPAGECOUNT huge pages } The numbers it gives me are plausible, but i'm far from confident this method is correct. Environment is a quad-CPU dell, 64GB ram, RHEL6.3, oracle jdk 1.7.x (current as of 20130728)

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• vps like [load] graphs

  - by foober

  I investigated a couple of tools but they were really annoying and not polished. kSar for exampe is supposed to graph sar output, but it doesn't work. There's a perl script around (sar2rrd) that's supposed to convert sar output in rrd format and generate graphs. Doesn't work. (at least it doesn't like the output of "atsar" as per debian/ubuntu package). Tried munin but it wants to mess with http servers, and for some reason it didn't really work, too. It displayed errors in the webpage generated by the http server it put on port 4949. So, is there a simple install and forget tool to generate daily load,cpu,memory,network graphs? It seems strange to me that this problem has not been solved, maybe I'm looking in the wrong places

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• teamviewer display is slow to refresh

  - by brunoais

  I'm using teamviewer from time to time to connect my portable computer with my desktop computer when I need to check on something (personal use). One of the main things I've been noticing is that it is quite slow transfering the screen updates that keep happening. This happens more frequently when I'm moving full windows or when I open a window or when watching a small movie clip. I've tested the lowest maximum p2p speed I ever got in the last week between both and it is the desktop's upload speed of 6MB/s with the ping of 40ms (usually ~15 ms). With this I was expecting to have very sharp image and fast transfer speeds which is not what is happening. Just to clarify, both computer's individual core's CPU is not reaching its peak (25%) while teamviewer is active, so the encryption and decryption is not the cause. Why my connection between both computers so slow?

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• Understanding why a 450W power supply is destroying my ATX motherboards but not mATX

  - by T. Webster

  Maybe I'm missing something really obvious here, but after going through 3 new motherboards in trying to build my new machine, I'm finally certain that the 450W power supply I bought has been destroying them. It seems like it should be simple: just connect the connectors where they fit and switch the thing on. But today after hooking it to my ASUS Sabertooth 990FX TUF Series Motherboard and switching it on, I could see and smell the smoke coming out of the motherboard. What I don't get is why I can hook this same 450W power supply up to my mATX motherboard and not run into the same problem. What am I missing here? Where on the box or manual is this? (I have 8x2 GB RAM, AMD FX-4100 3.6GHz CPU, 1 512MB ATI graphics card, 1 WD 7200 RPM SATA hard drive. )

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• Apache - mod_pagespeed freezes my website

  - by Jonathan Rioux

  I have installed the mod_pagepseed module for Apache. I am using Debian so I downloaded the .deb file, and installed it successfully. I then configured some filters, and it worked like a charm for some minutes. Then after something like 10 minutes, my website no longer responded to the requests. When I was requesting for my website, it said "Waiting for www.blablabla.com" and I never got the page back from the server. I checked the processes running on my Debian box with top -d 0.5, and nothing eats up the CPU. To make my website responding to requests again, I must do a /etc/init.d/apache2 restart. And then it works again with mod_modspeed applying it's filters for a couple of minutes, and no more response again. How can I diagnose this issue? Is there some other configurations in the mod_pagespeed.conf file that I must set?

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• Alternatives to amavis for RAM-bound server

  - by rsuarez

  I'm running a small VPS server that works as web and mail server. It has only 256MB of RAM, and it's sucking 100MB of swap constantly. I've found that one of the culprits is amavis, taking about 30MB of resident memory, and would like to ditch it and use some alternative. I don't have much mail daily, so it being a bit slower wouldn't be a problem. I'd like to avoid Spamassassin altogether, if possible, because it's quite big even if used in offline mode. I'm already using RBLs and a few small blacklists, and used greylisting for a while but abandoned it because it gave me a few problems (don't remember which; I think it was related to not configuring properly white lists for several big ISPs). So, is there some alternative to amavis that I could use without much RAM (and if possible, CPU) usage? Thanks in advance.

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• Where should I plug in my monitor -- Motherboard or Graphics card?

  - by Jeremy White

  Assuming I am using the following equipment... motherboard with HDMI/DVI & no embedded graphics discrete graphics card (nVidia or ATI) on PCI-E slot Intel CPU with integrated graphics ...where should I plug my monitor into the computer? Presumably, I'll get the fastest speed on games connected directly to the graphics card. But there is also power savings when connecting to the motherboard and accessing the Intel on-board graphics. I've read that some motherboards can switch automatically between the Intel graphics and discrete graphics. Is that something that works well, and where do I connect the monitor to enable that?

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• C++ interpreter conceptual problem

  - by Jan Wilkins

  I've built an interpreter in C++ for a language created by me. One main problem in the design was that I had two different types in the language: number and string. So I have to pass around a struct like: class myInterpreterValue { myInterpreterType type; int intValue; string strValue; } Objects of this class are passed around million times a second during e.g.: a countdown loop in my language. Profiling pointed out: 85% of the performance is eaten by the allocation function of the string template. This is pretty clear to me: My interpreter has bad design and doesn't use pointers enough. Yet, I don't have an option: I can't use pointers in most cases as I just have to make copies. How to do something against this? Is a class like this a better idea? vector<string> strTable; vector<int> intTable; class myInterpreterValue { myInterpreterType type; int locationInTable; } So the class only knows what type it represents and the position in the table This however again has disadvantages: I'd have to add temporary values to the string/int vector table and then remove them again, this would eat a lot of performance again. Help, how do interpreters of languages like Python or Ruby do that? They somehow need a struct that represents a value in the language like something that can either be int or string.

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• Amazon EC2- micro-instance vs single small/medium instance

  - by shashankaholic

  I have a chat application using stack of Openfire, Tomcat6 and MySQL. Currently, i have installed all these servers on single Linux micro-instance(613 MB memory). Even in low user base 10-20 i am encountering CPU overload which is quite obvious here. As, i am new to Amazon EC2 can somebody suggest me how to scale up my architecture according to traffic use? should i use separate micro instances for every app server(openfire,mysql,tomcat6) should i use single small or medium instance for whole server stack. Some factors in context: high reliance on MYSQL high memory usage due to file transfer web-application interacting with other Amazon service like S3,SES

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• VMWare ESX installation on sata disk

  - by ilansch

  I have a PC with Gigabyte H77 motherboard with Intel I5-3550 CPU 8 GB RAM 1600MHz and a 500GB Harddisk (7200RPM) - WD Sata III disk I wish to install esx on it and run some virtual machines on it. not alot, something like 2-3 VMs. My hardisk is Sata, is it possible to install ESX Server on it ? I am not worried about loading issues. When i try loading the installation it writes it cannot detect my disk (since its not SCSI disk). How can i bypass this ? or find a solution. thanks

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• x86 exceptions and flags

  - by b-gen-jack-o-neill

  Hi, please, I know that when you for example divide by zero, the aproptiate flag is set in CPU flag register. But today I read that there are special interrupt vectors (I think the first 16 in IVT) that are used for such conditions like dividing by zero. So, what I want to ask is, does any situation that couses change som flag also triggers apropriate interrupt? Becouse in school, we used conditional jumps that checks wheather carry flag has been set or not, and I don´t remember there was some interrupt triggerd by that. So I am pretty confused now.

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• What is fastest way to backup a disk image over LAN?

  - by David Balažic

  Sometimes I boot sysrescd or a similar live linux on a PC to backup the hardrive over local network to my server. I noticed many times, that the transfer speed is not optimal (slower than HDD and network speed). Any rules of thumb what to do and what to avoid? What I typically do is something like: dd bs=16M if=/dev/sda | nc ... # on client nc ... | dd bs=16M of=/destination/disk/backup1 # on server I also "throw" in lzop (other are way too slow) and sometimes on the fly md5sum calculation (both of uncompressed and compress source). I try to add (m)buffer (or other alternatives) to improve throughput (and get a progress indicator). I noticed that even with enough free CPU, adding commands to the pipeline slows things down. Typically the destination is on a NTFS volume (accessed via ntfs-3g, with the _big_writes_ option).

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• Can I build a laptop from scratch?

  - by Ciaran

  I've been looking at this as the same approach as building a desktop computer from scratch but I've never really come across the core things. Can I buy a laptop "case"? Can I buy a motherboard/PSU to fit that case? Can I choose a CPU fan? What are my battery options? Obviously taking into consideration the case. Why isn't this as easy as putting together a desktop computer? Shouldn't there be standards such as ATX? If they exist, what are they?

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• Debian is equal to Ubuntu

  - by rkmax

  The title of the question is confusing, and does not explain my point well. I've always used Ubuntu server from version 10.04 and never had problem, now I have 4 machines with ubuntu 12.04.1 LTS installed on them and I found that under any circumstances where there is a high burden throws me a problem and machine crashes constantly. the most common is CPU#X stuck for Ns! Now I wonder if the administration of Debian is equal to that of ubuntu, regarding Servicos, packages, folders structure for example I would like to know if the services are installed in the same manner using invoke-rc.d, which handles additional security, including for not giving blind caning. I've been looking for a comparison chart but have not found anything yet, something between Debian 6.0.6 and Ubuntu 12.04 also the most common "hiccups" when you install the system

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• memtest incorrectly recognizes my RAM

  - by Brendan Abel

  I recently built a computer and randomly got a couple blue screens. I've run memtest and one of the memory sticks consistently throws memtest errors, while the other does not. The odd part is, memtest lists the following settings for my RAM: RAM: 535 MHz DDR 107 / CAS 2.5-1-3-1 DDR1 128 bits But my RAM is DDR3 1600? Memtest also lists my cpu as AMD K8, even though it's K10. I've probably going to RMA the ram stick, but I just wanted to see if anyone had any insight into the weird memtest stats.

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• timeout with apache & php w/ each virtual host has his own user process

  - by acemtp

  I have 10 unix users in /home/. Each user is for a specific subdomain for example user www in /home/www/public_html is for www.mywebsite. blog in /home/blog/public_html is for blog.mywebsite. 90% is php and 10% ror for the moment i use apache + fastcgi that use SuexecUserGroup to setup the process with the good user. it seems to works but i have a strange behavior where after a few hours/days, the server stop answering (timeout) but the cpu load is still very low (it's a big server), the apache status display lot of "W" Sending Reply states but there's still 50 idle workers so it should be able to answer. in the older server (lot of slower) we add only one user and using mod_php and we never had this issue. is there another way to do that without fastcgi and SuexecUserGroup or do you know what's going wrong?

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• How to upgrade OS on Mac Mini with external USB Drive?

  - by David

  We have a G4 Mac Mini, circa 2005, running Mac OS X 10.4 Tiger, and we want to upgrade to 10.5 Leopard. We have a Leopard install disk, but the optical drive in this mini is broken. So we transferred the install disk image to a USB HDD, but now we can't figure out how to boot off it. From what I've read in Mac forums, some PPC Macs, including some G4's, have been able to boot from USB, even though it sounds like this wasn't officially supported, and it may well depend on the specific model of USB drive and Mac. My Mac says CPU is "PowerPC G4 (1.2)" and Boot ROM is "4.8.9f4". I was hoping I might just find somebody here who had that same Mac Mini and find out if they could make it work. I'd especially like to know any specifics about the USB drive they found success with. Any insights at all would be appreciated. Thanks.

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• httpd service keep restarting. after 15-20 mins

  - by niraj

  I have recently purchased Dedicated Server which has 16bg ram and 1TB Harddisk. It has Cpanel and for firewall CSF Installd. I am mainly going to install it for File hosting service. Now the day i moved my httpd service keep restarting every 15-20 mins. It becomes unresponsive after that so have to manually restart it. My httpd settings are Start Servers = 5 Minimum Spare Servers = 5 Maximum Spare Servers = 10 Server Limit = 20000 Max Clients = 10000 Max Requests Per Child = 10000 Keep-Alive = On Keep-Alive Timeout = 5 Max Keep-Alive Requests = Unlimited Timeout 300 TOP is top - 14:53:41 up 1 day, 23:39, 2 users, load average: 0.10, 0.14, 0.09 Tasks: 1563 total, 1 running, 1562 sleeping, 0 stopped, 0 zombie Cpu(s): 0.7%us, 0.6%sy, 0.0%ni, 98.1%id, 0.2%wa, 0.0%hi, 0.5%si, 0.0%st Mem: 16303780k total, 16142048k used, 161732k free, 135264k buffers Swap: 8224760k total, 868k used, 8223892k free, 14136616k cached Please help me in this its keep happning.

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• Is the 4pin atx power plug required [closed]

  - by rockinthesixstring

  I know the answer is probably a resounding YES, but I just wanted to double check. I just purchased a new chassis for my PC and now my 4pin cpu power plug doesn't reach. I'm wondering if the 4 pins are required for operation, or can I get by for the weekend without it until I can go get an extension? EDIT: Looks like it is mandatory with my Mobo. I tried to post without it and i just got a blank screen. Looks like I'm getting a new adapter asap.

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• low speed web application, Server problem or Application

  - by Ashian

  Hi, I have a web application written by asp.net (c#) sql server 2005. we host it on 2 dedicated server ( IIS and SQL server ) From some month ago , in some days of week we have many reports about speed issue. we have some other application on this server using same database. when we have speed problem all aplication on these server have this problem, but applications on other server in same data center work correctly. ram and cpu usage are ok. how can I check that the problem related to internet connection or my application design? which parameters must be checked. Some other information In applications users can upload several files to server , each file up to 3 MB. we use a sql web admin application, on same server that has same problem, this is a standard application which work perfectly on other servers. Thanks

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• seamless mode remote desktop connection from linux to windows

  - by mateusz.fiolka

  I am a programmer using Linux as my main OS, however sometimes I need to use windows (ie, office, ea). I'm running qemu with kvm to access the windows "machine". I would like to achieve something that is described here: https://help.ubuntu.com/community/SeamlessVirtualization (It means I would be able to run chosen applications on Windows and then display them locally on Linux as separate windows achieving good desktop integration). However seamless rdp is buggy and doesn't work on my machine (probably because I'm using a tiling window manager and a 64bit system). Are you aware of any other solution then rdp seamless mode? I would prefer to still use quemu because it uses cpu hardware virtualization, so different protocol/client combination would be preferable.

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• Unresponsive virtual OS

  - by confusedGeek

  Hopefully someone has a suggestion on how to resolve this. Configuration Host: Win 2003R2 w/Virtual Server 2005R2 Virtual1: Win 2003R2 w/Sql Server 2005 Virtual2: Win 2003R2 w/WSS 3.0 Situation This past weekend the power went out and took down the servers (no UPS, it's a desktop standing in as dev testing server). Since the servers went down the Virtual2 server after running WSS fairly heavily for an hour to two will become unresponsive via HTTP. If I login via virtual server's remote control I don't get anything beyond a background screen. The CPU counter on the virtual server's master status shows that it isn't doing anything. The only thing I have been able to do is to turn off Virtual2, which loses any state changes. Shutdown commands issue from the virtual server master status are ignored. After restarting Virtual2 the event logs and application logs don't indicate what caused the problem. Anyone have an idea as to how to repair the OS, or maybe what could be the problem? Thanks ahead of time.

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• MySQL Locking Up

  - by Ian

  I've got a innodb table that gets a lot of reads and almost no writes (like, 1 write for every 400,000 reads approx). I'm running into a pretty big problem though when I do INSERT into the table. MySQL completely locks up. It uses 100% cpu, and every single other table (in other databases even) have their statuses set to "Locked" until the INSERT is done. This is a big problem because MySQL stays locked up for up to 4 minutes. I'm using version 5.1.47 (rpm from mysql.com). Any ideas?

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