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• HD latency measurement using bonnie++ on different machines with different RAM size

  - by j0nes

  Hello, I have run bonnie++ v1.96 on two different servers without any additional load. One server is a "physical" Dell server with 32GB RAM, the other one is a virtual instance with 14GB RAM. I have read in the bonnie manuals that I should use two times the size of RAM in my bonnie runs, so I used 64GB on the physical machine and 28GB on the virtual machine. Now I want to compare the results, and I am wondering whether the results are comparable at all. The most interesting part is the latency part - on the physical machine, the values are about 10 times higher than on the virtual machine! Can I take these results seriously (e.g. the virtual machine HD is much much faster) or does the different RAM size tamper the results? Thanks! Jonas

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• Eclipse: would more CPU cores with HyperThreading help increase speed?

  - by Dylan

  I'm programming a very large project in Eclipse. Right now I use a dual core machine with 2GB RAM, but Eclipse is sometimes busy for minutes (refreshing/indexing/building), so I'm upgrading to a new machine (with 16GB RAM and an SSD). Now I must choose between an Intel 2500K or an Intel 2600K that has HyperThreading. The price difference is about $100. Would that be worth it, for Eclipse, or is more memory/faster drive much more important for Eclipse ? Can Eclipse make use of the HyperThreading at all?

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• dd clone hard drive: Input/Output Error though "chkdsk" says OK

  - by unknown (google)

  Hi, I've used dd to clone hard drives before using 'dd' and a live cd, but have run into a problem. The issue: dd fails with an "Input/Output Error" on /dev/sda3 , even though windows "check disk" (chkdsk) says it's ok. Context: Trying to replace my laptop hard drive w/ a faster one of the same size Laptop has NTFS on a 320gb hard drive Booting into knoppix Knoppix recognizes 'original' drive (/dev/sda) I am using a usb connection for ‘new' drive (irrelevant, but just an fyi) Knoppix recognizes the usb drive as /dev/sdb Using dd, as follows: dd if=/dev/sda of=/dev/sdb "dd" gives the I/O error above at 82Gb (out of 320Gb) I then tried checking each partition as follows and found it failed on /dev/sda3: dd if=/dev/sda1 of=/dev/null dd if=/dev/sda2 of=/dev/null dd if=/dev/sda3 of=/dev/null I have ran windows xp chkdsk on the offending drive in both "find only" and "find and fix" mode and it reports no errors Question How can I find and fix the error on my original hard drive partition (i.e. /dev/sda3) so that dd reads it successfully?

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• Share internet with my phone?

  - by Kenneth Cochran

  Most people want to use their cellphone as a modem for their computer, commonly referred to as 'tethering'. I'm actually interested in doing the opposite: Sharing my landline internet connection(which is much faster than any 3G service) with by cellphone. My phone is a Verizon BlackBerry Curve 8330 and it has USB and bluetooth connections. I know both USB and Bluetooth are capable of supporting tcp/ip traffic what's not so clear is: Is IP over USB or Bluetooth standardized? Is it supported on my phone? Has my cellphone company crippled my phone to prevent me from using it?

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• Recommended Setup

  - by Chris Ryan

  I have been running into issue with my MSSQL Database setup with speed. Here is my scenario. About 100M Rows Average: 1k Updates Per Second Hard Drives: RAID 10 SSD MDF --Active Time: 0 Log Drives: 1 SSD LDF - Simple Recovery --Active Time 99.9 --Queue: 8 I do not need a back up of the log so it is set to simple recovery but my bottleneck is still at my log. I get high WAITLOG times and thus it can not update any faster. I can't do bulk updates/transactions and each update needs to be one at a time. Is my only option to increase write performance of the log drives, add a RAID drives? Any suggestions on increasing the performance?

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• How do I clean dust from a computer?

  - by Jonas

  As computers become faster and generate more heat it gets more important to have good ventilation, but that also increases the amount of dust sticking to the components of the computer. It's of course better to make sure the computer never gets dusty by vacuum cleaning around it (not in it) frequently. But what to do if it's already to late? I've heard that vacuum cleaning the computer itself is very bad, since it can cause static electricity that hurts the computer. So, Does anyone have any tips for how to remove dust from your computer?

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• Nomachine 4 for X forwarding

  - by Yair

  I have been using nomachine nx client to connect from my mac to an ubuntu server for a while now and it has been a great experience. The most useful feature for me was the option to open up just one application on the remote machine, instead of a full remote desktop connection. I used to to open a terminal on the remote machine. Basically it was a much faster, much better replacement for ssh -X. All was great until I upgraded to the new version - nomachine 4. In this version I can not find that option. I have to run a full remote desktop session, which slows things down and is also much less convenient for my work. Was this option removed from the client? Or is it hiding somewhere in there and I just can't find it?

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• Recursively resize images from one directory tree to another?

  - by davr

  I have a large complex directory tree full of JPG images. I would like to create a second directory tree that exactly mirrors the first, but resizing all the images down to a set size (say 2000x1500 or something) and quality (perhaps 85%). Is there any tool that would allow me to easily do this on Windows? I could write some scripts to automate it with bash and image magick, but first want to see if it's already been done. Faster is better too, as I have thousands of images. So something like Photoshop is probably not a good solution as it might take a couple of seconds per image.

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• Does anyone still use Iometer?

  - by Brian T Hannan

  "Iometer is an I/O subsystem measurement and characterization tool for single and clustered systems. It is used as a benchmark and troubleshooting tool and is easily configured to replicate the behaviour of many popular applications." link text Does anyone still use this tool? It seems helpful, but I'm not sure if it's for the thing I am trying to work on. I am trying create a benchmark computer performance test that can be run before and after a Windows Optimization program does its stuff (ex: PC Optimizer Pro or CCleaner). I want to be able to make a quick statement like CCleaner makes the computer run 50% faster or something along those lines. Are there any newer tools like this one?

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• Is there a way to determine the original size or file count of a 7-zip archive?

  - by Zac B

  I know that when I compress an archive with the 7za utility, it gives me stats like the number of files processed and the amount of bytes processed (the original size of the data). Is it possible, using the commandline (on linux) or some programming language, to determine: the original size of an archive, before it was compressed? the number of files/directories contained within an archive? The answer might be "no, just decompress the whole archive and do counting/sizing then", but it would be useful to know if there was a faster/less space-greedy way.

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• NIC: Changing Link Speed & Duplex to Full Duplex Is Drastically Slower

  - by rism

  I have an old Win Xp box with a 100 PRO/100 VE NIC and connecting to a Win 7 box with gigabit NIC via an ASUS gigabit router and peer to peer. I was getting 76% network utilisation on the XP machine using AUTO as the value for Link Speed and Duplex which is fine. But I decided to see what would happen if i selected Full Duplex 100Mbps on the XP box. I thought at worst it would be as good as auto detect since the Win 7 box it's transferring to is faster. Instead network utilisation dropped to 0.12% (as in a 10th of a percent) and the transfers just timed out. No biggie to reverse back to Auto but my question is why is full duplex such a dog? Im not "stuck" but just dont understand. There are only 2 machines here connecting through a router so i cant see how that would cause alot of collisions etc (if thats the problem).

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• XKB - remap arrow keys and preserve shift behaviour to select text

  - by dgirardi

  I realize arrow key remapping is an old problem, however I cannot seem to find a good solution that lets me select text with SHIFT + remapped keys as I would do with the vanilla arrow keys. For instance, if I remap Caps Lock to ISO_Level3_Shift and set xkb_symbols to read either key <AC08> { [ k, K , Down, Down] }; or key <AC08> { type="THREE_LEVEL", [ k, K , Down ] }; Pressing Shift+CapsLock+K will behave exactly as CapsLock+K (while Shift+Down behaves differently from Down alone). I had somewhat more success using higher level macro utilities and generating keyboard events (i.e. generate both the shift and the arrow keypresses); hoever that approach has a whole set of different problems - often the UI response to a simulated keypress is different from the "real" keypress, and there are performance problems as well - I can type faster than the thing can handle. Tl;dr; how can you shift-select using remapped arrow keys under X?

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• Book recommendation for learning server management and Apache

  - by japancheese

  Hello, I'm currently managing a site that I feel could be optimized and utilized to be much faster, however, I'm having difficulty finding reliable information to do it. I find the Apache documentation to be a hard read, and too technical about things I don't have a strong grasp on. I'm just looking for a good beginner/intermediate book about server administration to learn as much as possible about Apache, as well as how to create a nice secure, robust server that doesn't crash at the first hint of unusual traffic surges. Thanks to anyone who can point me in the right direction.

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• SQL restore from single file db to filegroup

  - by Mauro

  I have a 180GB MOSS 2007 database whose maintenance (i.e. backups and restores) are becoming a problem. Part of the issue can be resolved by splitting the three content sites down into their own site collections, however this will likely still leave me with a 100gb DB to deal with. Whilst this isnt entirely problematic for SQL it does mean that backups / restores take far too long. my idea is to split each of the databases to 30gb files, then to import the content into them which should distribute the content across the file groups,making it much easier / faster to backup/restore. Is there a way to backup from a single file and restore to a filegroup? If i have the wrong understanding of filegroups then I'm more than happy to find out other methods of managing the size of databases.

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• Harvard vs. Von Neumann architecture

  - by user32569

  Hi. Our teacher told us, that Harvard architecture is the most evolved and produced architecture today and towards future. but I thing becouse os massive averhead of x86 and Von Neumann nased ARM systems that actually Von Neumann is the most used architecture today. Yes, MCUs with Harvard are even more produced, but since they all have just minor purpose (compared to x86 and ARM based) that Von Neumann is actually the one. Or is it really Harvard? And second, I know this is strange question, but does any architecture combining both exists? to have separate memory for data and programs, therefore faster instruction processing, but still able to work with these as Von Neumann? To be able o load amd unload programs to program memory on the fly? Isnt this the way the x86 should have go? Or would there be some bottleneck that pure Von neumann solves? Thanks.

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• Speeding up ROW_NUMBER in SQL Server

  - by BlueRaja

  We have a number of machines which record data into a database at sporadic intervals. For each record, I'd like to obtain the time period between this recording and the previous recording. I can do this using ROW_NUMBER as follows: WITH TempTable AS ( SELECT *, ROW_NUMBER() OVER (PARTITION BY Machine_ID ORDER BY Date_Time) AS Ordering FROM dbo.DataTable ) SELECT [Current].*, Previous.Date_Time AS PreviousDateTime FROM TempTable AS [Current] INNER JOIN TempTable AS Previous ON [Current].Machine_ID = Previous.Machine_ID AND Previous.Ordering = [Current].Ordering + 1 The problem is, it goes really slow (several minutes on a table with about 10k entries) - I tried creating separate indicies on Machine_ID and Date_Time, and a single joined-index, but nothing helps. Is there anyway to rewrite this query to go faster?

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• Thinkpad Bluetooth turns itself on upon restart/hibernate

  - by Traveling Tech Guy

  I have a T400 with Windows 7 64bit. About 3 weeks ago, the Lenovo update pushed a Bluetooth update that added a 2.1 driver and device experience. Since then, my bluetooth turns itself on whenever the OS comes up (full restarts as well as waking from hibernation). I can turn it of using the <Fn>+<F5> Radio menu, but it just turns itself on again the next time. If I forget to turn it off, it just eats my battery that much faster.I've been scouring the web and couldn't find similar occurrences. Is this a hardware issue, a BIOS issue (although no reference to BT in any of the BIOS menus), a driver issue or (shudder) a user issue? Thanks for your help.

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• VPN trace route

  - by Jake

  I am inside an Active Directory (AD) domain and trying to trace route to another AD domain at a remote site, but supposedly connected by VPN in between. the local domain can be accessed at 192.168.3.x and the remote location 192.168.2.x. When I do a tracert, I am suprised to see that the results did not show the intermediate ISP nodes. If I used the public IP of the remote location, then a normal tracert going through every intermediate node would show. 1 <1 ms <1 ms <1 ms 192.168.3.1 2 1 ms <1 ms <1 ms 192.168.3.254 3 7 ms 7 ms 7 ms 212.31.2xx.xx 4 197 ms 201 ms 196 ms 62.6.1.2xx 5 201 ms 201 ms 210 ms vacc27.norwich.vpn-acc.bt.net [62.6.192.87] 6 209 ms 209 ms 209 ms 81.146.xxx.xx 7 209 ms 209 ms 209 ms COMPANYDOMAIN [192.168.2.6] Can someone explain how does this VPN tunnelling works? Does this mean VPN is technically faster than without?

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• How to take advantage of two Internet connections (WiFi / Wired)?

  - by Madhur Ahuja

  I have two separate internet connections, one through WiFi and other Wired. However, generally I have observed that Windows try to use only one ( mostly faster one/ Or Wired by preference - I am not sure). Is there a way I can take advantage of having both ? For example I can have my web browser use the wired one and my torrent software use the Wifi One. PS: This question may be regarded as duplicate but reason I am posting it again is I have not found any concrete answer for it. Two internet Connections, one LAN - how to share?

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• como se que esta funcionando AWE?

  - by adan851018

  Tengo un servidor con 8GB de RAM de 32 bits, instale windows server 2003 enterprise y sql server 2005 enterprise, el Sistema Operativo reconoce los 8GB, pero el Sql Server solo usaba 1.6 GB de memoria, entonces agregue al boot.ini el parametro /PAE y en Sql Server le habilite AWE de 1GB a 5GB, despues de reiniciar el servidor el Sistema que usa la BD estaba mas rapido mejoro bastante, pero en memoria el Sql Server solo usa 100 MB, veo la cantidad de memoria usada en el Administrador de Tareas de Windows, y no se si esta funcionando AWE o que sucedio? Rough translation: I have a server with 8GB of RAM 32-bit, install windows server 2003 enterprise and sql server 2005 enterprise, the operating system recognizes the 8GB, but the SQL Server only using 1.6 GB of memory, then add to boot.ini the parameter / PAE and will enable AWE Sql Server 1GB to 5GB, after rebooting the server using the database system was faster, the better lot, but in memory the SQL Server only uses 100 MB, I see the amount of memory used in Manager Windows Tasks, and not if AWE is running or what happened?

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• Apache mpm-itk Performance

  - by Matt Beckman

  I manage a bunch of VPSs with memory ranging from 1GB to 8GB. Most of these websites are Joomla websites, and the servers must support multiple sites/users/S-FTP. I use mpm-itk almost exclusively (mostly due to it's convenience in these shared environments). However, I'm aware it isn't known for performance, so I need some advice on making it faster. Due to the lack of documentation when I first went the way of mpm-itk, I included only one setting in the config, and that was to limit each user to 50 clients (the rest I left up to defaults): <IfModule mpm_itk_module> MaxClientsVHost 50 </IfModule> Are there any better alternatives available? Are there any settings supported in mpm-prefork or mpm-worker that are also supported in mpm-itk? Thanks!

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• PS/2 vs USB keyboards: performance and energy consumption

  - by Mister Smith

  As far as I know, PS/2 keyboards are interrupt driven, while USB are polled. Typically a PS/2 keyboard was assigned IRQ_1 on Windows. I'm no hardware expert, but at a first glance seems like the PS/2 keyboards are more efficient. So here are my questions: On modern day computers, are PS/2 keyboard better (or faster), and if so, would it be noticeable at all? (e.g.: in gaming) Since they don't need polling, do PS/2 keyboards save energy compared to USB? (notice I'm not talking only about the peripheral here, but about the overall computer energy consumption). In case PS/2 had any advantage over USB, would adding a PS/2 adapter to my USB keyboard make the device as good as an actual PS/2 keyboard? Conversely, would adding a USB adapter to a PS/2 make it as bad as a USB KB? Thanks in advance.

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• How do I overclock a dual core processor?

  - by Pankaj Bhardwaj

  This is a serious problem. I want to speed up my compilation process. I have never been especially fond of overclocking, however my current compilation time for my project makes my crazy! I found information about which parameters I should change to overclock and which values are safe. However, I have one basic problem. I don't have the ability to change this option in my BIOS. It is possible that these options have been blocked by the system administrators? Getting a faster processor is not an option. How do I edit the proper values to overclock my CPU. Do I need to flash my bios to another version? My specs: Entium Dual-Core Cpu E5400 @2.7GHz Asrock motherboard 4GB RAM Windows 7 Ultimate 32-bit

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• XenServer migrate machines between hosts

  - by Hubert Kario

  I have a XenServer 5.6 Free setup with 5 VMs (Windows and Linux) using about 1.5TB of directly attached storage. Because our virtualisation needs have grown a bit, we currently are preparing a faster XenServer 6.0 Free machine with more RAM and a more storage. Again, directly attached disks. How can I migrate the VMs between XenServer machines? I don't need to keep the machines up and running during migration, but using VM export and import would definitely take too long. Would making a VM with the same configuration on new host and dd'ing the LVM volume over network be the only quick and least painful solution? Are there any "gotchas" I should look out for when doing something like this? The old machine has an AMD Phenom II, the new has Intel Xeon E5 CPUs.

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• How to speed up apache

  - by Zen_silence

  We have a server with 8Cores, 16GB of RAM and RAID 0 SAS 10K drives. Our goal is to use this to serve a fairly simple php application quickly. We have tested all other components and we think we have narrowed it down to apache is our bottleneck. I am no apache guru I have done some research and tested a couple things but when i test with JMeter launching 100 concurrent connections against the server the first 10 - 20 come back quickly 30 - 100ms but the rest take between 1000ms to 3000ms. Anyone have any ideas on what to change in our apache config to make this faster right now its a vanilla install of apache.

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