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• in HFT trading should I upgrade from Windows Server 2008 R2 to Windows Server 2012?

  - by javapowered

  I'm using HP DL360p Gen8 + Windows Server 2008 R2 for HFT trading. That means that every 10 microseconds is important for me. I do understand that if I need everything to be so fast I probably should consider using Linux. But in this post I want to compare only Windows Server 2008 R2 and Windows Server 2012. I've found in internet couple articles that suggest how to tune Windows Server 2012 for low latency http://msdn.microsoft.com/library/windows/hardware/jj248719 http://technet.microsoft.com/en-us/library/hh831415.aspx Most part of optimizations from these articles apply only to Windows Server 2012 and can not be used on Windows Server 2008 R2. So now I think that as I can optimize Windows Server 2012 for low latency, probaly I should upgrade? After optimizations how much faster windows server 2012 would be (ideally in microseconds :)?

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• rename file names from lower case to upper case

  - by Adnan

  Hello, I have about 2k of file that are currently in lower case like: file_one.cfr file_two.cfr .... I am searching for a fast way to rename them to upper case so they would be like; FILE_ONE.cfr FILE_TWO.cfr .... If I use from my shell; for i in *; do mv $i `echo $i | tr [:lower:] [:upper:]`; done I can get all file and the file extensions to upper case. But the extension should remain in lowercase, so my approach does not work. Any programming language is welcome.

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• RAID 0 performance gains?

  - by NickAldwin

  I'm building a new computer over the summer. I'm fairly competent in computer hardware, and am thus building the computer from scratch. I have everything planned out, but I was wondering about RAID. I asked which RAID I should use earlier, but now that it's pretty clear that RAID 1 isn't really that great, I think I'll go with cloud-backup instead of disk-redundancy. However, I still face a choice: use two 1TB drives as two 1TB drives, or combine them into a RAID 0 striped array. Is there any performance gain at all? I know that if one drive dies, everything is gone, so is the performance gain worth it? I'm building a pretty advanced computer, with SLI video cards and a fast CPU, so I'm thinking RAID 0 would give me some good hard drive performance. From your experience, is RAID 0 viable?

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• Best way to automatically synchronize files between Linux and Windows

  - by Gregory

  My first choice was rsync but it caused some issues and is too manual. My second choice, currently under evaluation is Unison. Are there any other good options for bi-directional auto-syncing? The synching tool cannot add it's own files to the directories to be synched. Which removes CVS/SVN as a choice. Plus they are too manual. The requirements are user-level program on both sides, no root account access available. Only scanning on linux. On windows it could be a virtual drive/path. Very fast and efficient like rsync. Some other requirements include: machines are not on the same network, files cannot fall into the wrong hands, nor can they be handled by 3rd parties, this pretty much excludes all online storage sites.

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• Suggestions for a nice&small - high battery life programmer notebook

  - by Emir

  Hi guys, I'm planning to buy a new notebook since the Toshiba I have now sucks in battery life. I'm a web designer & programmer, and the main features of the notebook should be: High battery life Small, 13.3" or 14" screen A fast processor and RAM that won't let me down while multi-tasking Anything other than these is secondary, I wouldn't like it to be very pricey though :) I'm now leaning towards Macbook Pro 13.3", 2.66 Ghz; it has 10 hours of battery life. However, I mostly develop on Windows, so I don't know how many hours of battery will I get if I run Windows 7 on Bootcamp. Your ideas and suggestions will be much appreciated.

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• VMWare ESX Updates - Which to Apply?

  - by Aaron Alton

  Wondering what more experienced ESX admins typically do... I just brought our ESX hosts up to 3.5 Update 5 (Yes, I know we're behind still). I then applied the "Critical Host Updates" baseline in VMWare update manager, and found that we're still short on 14 "critical updates". My question is, do most people go ahead and apply any update flagged as critical, or do they evaluate each update one-by-one to determine whether or not the issue that has been addressed is likely to affect them. In the SQL Server world (my alma mater, so to speak), we regularly apply service packs, and sometimes cumulative updates, but we only apply hotfixes when the issue that they are targeted towards affects us. Does the same logic hold fast in VMWare land?

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• Build a RAID-5 USB Array or NAS?

  - by TK Kocheran

  I'm looking to build a RAID-5 or RAID-6 hard disk array to be used as a centralized backup location for my home network. I have a lot of 4-8GB DVD ISO files which I intend to serve over the network to my TV using DLNA or something similar. I need decent write times, fast read times, and preferably a way to connect this array to my network router over USB. I'll probably be using ext3/4 on it (I'd use btrfs if my router supported it :-[). Is there a way to build a RAID array that is accessible over USB? I'm kind of new to this and most guides assume you're running a RAID array inside your machine. I need at least 5TB of space, and I need redundancy, so I prefer RAID-6. How can I go about accomplishing this?

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• Explorer and open file dialog not responding (Vista)

  - by rohancragg

  Any explorer window opened for the first time on my machine causes the explorer window to display the folders tree and folder path in the address bar immediately but the file/folder list pane is blank and the window displays 'Not Responding' in the title bar, this hangs for up to a minute or more. Any file dialog displays 'Not Responding' in the title bar. The files list is eventually displayed after a few seconds or more. Steps to repro: Close all open instances of explorer Windows Key | Run | [enter a folder path such as 'c:\temp'] Or within any app: use a file open / save dialog Once there is at least one open instance of explorer the performance is still fairly poor but not nearly so bad and file lists are displayed in a timely fashion. What I've tried: Cleaned up registry with CCleaner tool, and uninstalled all other unused software Checked nothing unwanted running at startup with Autoruns Removed any ISO burner/recorder/mount software Still to try Get latest version of everything - especially stuff with shell extension behaviour such as TortoiseSVN Anyone have any other suggestions? Thanks alot. Update I'm wondering if this is related, I'll try the hotfix when I get home and report back: KB972685 - FIX:Explorer.exe hangs when using a shell extension written using MFC Update 2 Before I got a chance to try the hotfix it seems one of the above actions fixed this for me; either the removal of IsoRecorder or TortoiseHg (which I was no longer using anyway). Update 3 A similar issue with Explorer.exe has come back since installing TortoiseHg 1.01 :-(

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• DNSMASQ configuration

  - by sean

  I am using DNSmasq, OpenDNS and DYNDNS. DYNDNS is for my FTP site, and I am using OPEN DNS to filter porn from my kids itouch/ipad. However, I would like a few computers to have the capability to bypass openDNS, and pass through to a fast DNS server like google or similar. I would also like to fowrard all traffice from DYNDNS to my FTP server. Any ideas? This is what I have thus far.. strict-order dhcp-mac=filter,00:25:64:DB:A8:8A dhcp-option=net:filter,6,8.8.8.8,8.8.4.4 Its not working thus far, can someone help me accomplish what I want to do?

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• Apache 2.4.3 php-fpm mod_fast_cgi and mod_cache

  - by Anjia

  Did anybody successfully configured mod_cache in apache 2.4 with php-fpm and fastcgi? my cgi config: <IfModule mod_fastcgi.c> Alias /php5.fastcgi /var/www/fastcgi/php5.fastcgi AddHandler php-script .php FastCGIExternalServer /var/www/fastcgi/php5.fastcgi -socket /mnt/tmp/fast/php-fpm.sock -idle-timeout 1600 -pass-header Authorization Action php-script /php5.fastcgi virtual My php-fpm config is standard and I am loading mod_cache and mod_disk_cache in Apache. However the Apache does not seems to cache any content. The debug log file: Fri Sep 07 23:22:59.691333 2012] [cache:debug] [pid 35623:tid 123613201929984] mod_cache.c(161): [client 10.0.0.22:21938] AH00750: Adding CACHE_SAVE filter for /index.html [Fri Sep 07 23:22:59.691345 2012] [cache:debug] [pid 35623:tid 123613201929984] mod_cache.c(171): [client 10.0.0.22:21938] AH00751: Adding CACHE_REMOVE_URL filter for /index.html [Fri Sep 07 23:23:01.326598 2012] [cache:debug] [pid 35623:tid 123613185144576] cache_storage.c(626): [client 10.0.0.110:5414] AH00698: cache: Key for entity /index.html?(null) is `http://10.0.1.16:8080/index.html?`

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• LVM2 vs MDADM performance

  - by archer

  I've used MDADM + LVM2 on many boxes for quite a while. MDADM was serving for both RAID0 and RAID1 arrays, while LVM2 where used for logical volumes on top of MDADM. Recently I've found that LVM2 could be used w/o MDADM (thus minus one layer, as the result - less overhead) for both mirroring and stripping. However, some guys claims that READ PERFORMANCE on LVM2 for mirrored array is not that fast as for LVM2 (linear) on top of MDADM (RAID1) as LVM2 does not read from 2+ devices at a time, but use 2nd and higher devices in case of 1st device failure. MDADM reads from 2 devices at a time (even in mirrored mode). Who could confirm that?

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• Faster two way Boomark/History Sync for Firefox?

  - by geocoo

  I need a fast automatic two-way bookmark & history sync. Firefox sync seems too slow because I might bookmark/visit a URL then within a few mins put desktop to sleep and leave the house; if it hasn't synced, then I don't have a way of getting it on my laptop (or vice versa). My home upload is only around 200kbps so maybe that's why FF sync seems slow? (I mean it's minutes, not seconds slow). I have read there are a few ways like xmarks/delicious/google but I don't want clutter like extra toolbars or have to visit a site to get bookmarks, they should be as native in the Firefox bookmarks bar as possible, organised in the folders/tags. I know someone must have experimented/know more about this. Thanks.

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• Our wi-fi at work is ridiculously slow, will adding more range extenders improve it?

  - by john

  At work, we have two wireless networks (e.g., Work1 Work2); the Work2 is used downstairs and Work1 is used upstairs. However, both are notoriously slow. The connection is better when we are wired in, but unfortunately due to our building being very old and our company growing very fast, most employees are not seated near the walls where the ethernet cables are. I had Cox, our ISP, run a bandwidth utilization test and it doesn't seem like we are capping out on upstream/downstream, which leads me to believe that it's strictly an issue with the wireless networks (which were implemented before I got there). The wireless networks are both Apple Airport Extremes. Is there anything I can do to improve the situation for everyone? Speeds are extremely slow, and sometimes drops out.

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• MySQL is killing the server IO.

  - by OneOfOne

  I manage a fairly large/busy vBulletin forums (~2-3k requests per second, running on gigenet cloud), the database is ~ 10 GB (~9 milion posts, ~60 queries per second), lately MySQL have been grinding the disk like there's no tomorrow according to iotop and slowing the site. The last idea I can think of is using replication, but I'm not sure how much that would help and worried about database sync. I'm out of ideas, any tips on how to improve the situation would be highly appreciated. Specs : Debian Lenny 64bit ~12Ghz (6 cores) CPU, 7520gb RAM, 160gb disk. Kernel : 2.6.32-4-amd64 mysqld Ver 5.1.54-0.dotdeb.0 for debian-linux-gnu on x86_64 ((Debian)) Other software: vBulletin 3.8.4 memcached 1.2.2 PHP 5.3.5-0.dotdeb.0 (fpm-fcgi) (built: Jan 7 2011 00:07:27) lighttpd/1.4.28 (ssl) - a light and fast webserver PHP and vBulletin are configured to use memcached. MySQL Settings : [mysqld] key_buffer = 128M max_allowed_packet = 16M thread_cache_size = 8 myisam-recover = BACKUP max_connections = 1024 query_cache_limit = 2M query_cache_size = 128M expire_logs_days = 10 max_binlog_size = 100M key_buffer_size = 128M join_buffer_size = 8M tmp_table_size = 16M max_heap_table_size = 16M table_cache = 96

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• Connecting to VPN via Proxy

  - by Rodrigo

  Hi, My company's VPN server is located in Netherlands, from my current location this is a really crappy place in terms of connectivity, connection keeps dropping, it's slow and keeps being reset during high traffic times. I have a dedicated server over USA which is able to connect to VPN server without this issues, connection is stable and fast. My question is, how do I connect to this VPN using a proxy running on my dedicated server? I'm on Windows 7 using a VM on XP to connect to the VPN. Thanks.

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• Website pages very slow to load on first access

  - by Merianos Nikos

  I have a production web server that makes sites to be very slow when load for first time. After the first time all connections are normal and fast. In the following screen you can see the first test I have run for a random site in my server: and here you can see the result of the second time request: As you can see there is a big change in the second load of the same page. Here is the page load time graph: My problem is that I don't really know anything about Red Had Linux server, and also I don't know where can I start. Can somebody to help me ? I like to find out the solution for the long time "wait" in connection. I know that my question is very minimal, but you can always ask me to give you information about the server.

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• Replicate / SYNC / Copy thousands of files

  - by rihatum

  Windows 32BIT Box (Server OS) 4GB RAM a 800GB LUN Mapped to the above box as a local drive Around 700GB of text files (Yes text files and a few thousand word documents) nested in thousands of directories. I need to move this to a new storage and map another server to it. What would be the best way to go about it ? What I did was mapped the existing LUN to our new box and mapped a LUN from the New storage to the new box too, and tried copying (windows copy) but that wasn't good / fast enough considering the downtime. I am now looking for either a script which will do this or a utility (prefer opensource / free) to move this size of data at a good speed. 2 x 1GB Nics teamed ether channel 2GBPs Any suggestions or pointers would be off great help Thanks !

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• Slow performance by PHP directory operations on virtual machine (Ubuntu libvirt)

  - by thonixx

  Some days ago I installed an Ubuntu server and two running virtual machines with libvirt. Everything works fine except one performance problem. Everytime when I call a PHP script with directory operations the operations are very slow and not performant. Here is an example: http://zother.white-tiger.ch/ And here you see an example without a directory operation and how fast it is: http://michaeltanner.ch/ It's all on the same virtual server. The virtual machine uses 6 cores (8 are available) and 7500 megabytes RAM (8 Gigabyte are available). The disk image format is qcow2. How can I improve the performance?

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• PHP cgi locks up and times out.

  - by Oli

  I've got a dozen wordpress sites hosted on a nginx/php-cgi setup. After a variable amount of time (usually not that long, and occasionally very fast) PHP locks up and after 2 minutes (the timeout I set in nginx), it get a 504 timeout. I've tried everything I can think of. I've been using an init script to launch php-cgi but I compiled out php-fpm and tried that for a day with various configurations with the same results. I've tried a low number of PHP_FCGI_CHILDREN. I've tried as high as my RAM will let me. I've tried various settings for PHP_FCGI_MAX_REQUESTS. xcache seemed to exacerbate the issue, so I removed it. The server is a VPS but it has over a gig of ram dedicated to it. All suggestions are welcome at this juncture because I'm desperate.

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• Fragile XenServer won't create new VDIs anymore

  - by thoiz_vd

  I'm getting increasingly frustrated with XenServer. Currently I'm using 5.6FP1 and it seems to be very fragile. Canceling any VDI-related action almost guarantees trouble. This time I tried to create a new VM using a snapshot for a template, with the fast disk cloning option disabled. It would take much longer than I was able and willing to keep my XenCenter open, so I canceled it. That took ages too, so I had to decide to "Quit Anyway." Since, I seem unable to create any new VDI. New attempts at cloning halt with "The attempt to clone the VDI failed," and creating new VMs based on built-in templates hang at "Provisioning." I'm in need of some advice how to solve this. What I did so far is run a xe vdi-list, which returned nothing odd to me, but I'm no expert. I assume that an incomplete VDI is blocking my Storage Repository somehow, however, how to deal with that remains unclear.

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• How can I re-encode H.264 video with minimal quality loss?

  - by SofaKng

  I have a lot of MPEG-TS files (.TS container but H.264 video) and playback is fine except that when you skip forward/backward or fast forward it's very sluggish and gets pixelated, etc. I've been trying to do research and I'm guessing that they were encoding with very few reference blocks (ie. it's a capture from a DVB-S satellite stream). When I re-encode them with Handbrake (.MP4 container) they play very, very good and seeking in the video is instant, etc, etc. Is it possible to transcode/re-encode my MPEG-TS files with minimal quality loss? If so, what is my best bet? They are each about 2 Mbps (ie. 2 GB per hour) but I don't want to re-encode them if "minimal quality loss" requires 10+ GB per file. I'm hoping to keep the video are the same size. Can anybody give me any advice?

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• NX Client running on OS X 10.6.3 => NX Server Ubuntu 10.04: weird keymapping issue

  - by Mike D

  I have been using Ubuntu 9.10 at work after switching from vista. After being (expectedly) disappointed with performance over VNC (via VPN) when logging in from home, I came across the NOMACHINE suite. Last week, I upgraded from OS X 10.6.2 = 10.6.3 at home. After that, I also updated my NX Client at home to the latest version, as there were issues with recent changes in the OSX X11 setup that rendered the NX connection useless. At that point, everything worked fine. Fast forward, I upgraded from 9.10 = 10.04 on my work machine the next day, and after coming home and trying to log-in remotely, I noticed that the "s" and "m" keys, when pressed locally, acted as if the meta key was being pressed on the remote machine. That is, the "s" key opens in the Ubuntu login menu (the power icon), and the "m" key opens the messaging menu. I found some info on using xmodmap to remap keys, however, I can't even begin to fathom what keys I could remap to solve this issue. Any ideas?

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• NAS + XBMC combination

  - by Hendrik

  I currently own a WD Sharespace and I am not too happy about it. It will freeze constantly and its rather slow. I've been thinking of replacing it. I also own a WD HD Live, and it works like it is supposed to, but recently I've seen XBMC in action and I was quite impressed. I've been wondering lately about the possibility of replacing both products with one new device: a fast reliable nas which I can install XBMC on and is capable of rendering video and has an HDMI out. Do any such devices exist for sale or is the only way to build one from scratch? I've seen HTPC's for sale but I've never seen any of them with a raid setup. I've also read about building your own NAS with freeNAS but those setups dont allow you to run XBMC. Does anyone have experience with this?

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• Hybrid Shutdown in Windows 8

  - by Moab

  Referring to this article published September 8, 2011, it gives instructions on how to to do a full (non-hybrid) shutdown in Windows 8 from the command line. We have an option in the UI to revert back to the Windows 7 shutdown/cold boot behavior, or since that’s likely a fairly infrequent thing, you can use the new /full switch on shutdown.exe. From a cmd prompt, run: shutdown /s /full / t 0 to invoke an immediate full shutdown. shutdown /s /full /t 0 I tried this in W8 Enterprise RTM trial, but did not work, so I did a shutdown /? and noticed they have changed the command for a Full shutdown It appears the /s switch now does the full shutdown as explained in the MS article, and the /hybrid switch does the hybrid shutdown for fast startup. Can anyone confirm this change in other RTM versions of Windows 8? Any Microsoft docs on this change are welcome.

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• internet access options in remote area? (read: no comcast,qwest, etc)

  - by freedrull

  Currently I am living in a fairly "remote" area, in the countryside, and cable internet access through the typical companies like comcast and qwest is just not available here. I've been trying to research other options for fast internet access. There are some small cable companies but they currently do not offer broadband access here. I thought about maybe buying a 3g phone with a data plan and doing some sort of tethering, or perhaps getting an android phone and using it as a wireless AP. This would of course depend on 3g being available here. The only other thing I can think of is some sort of satellite internet service, or doing something crazy like adapting wifi over am radio. Anyone have any ideas, at all, short of moving somewhere else?

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