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• VS2010 + Resharper 5 performance issues

  - by Jeremy Roberts

  I have been using VS2010 with Resharper 5 for several weeks and am having a performance issue. Sometimes when typing, the cursor will lag and the keystrokes won't show instantaneously. Also, scrolling will lag at times. There is a forum thread started and JetBrains has been responding. Several people (including myself) have added their voice and uploaded some performance profiles. If anyone here has has this issue, I would encourage you to visit the thread and let JetBrains know about it. Has anyone had this problem and have a suggestion to restore performance?

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• Problem with Variable Scoping in Rebol's Object

  - by Rebol Tutorial

  I have modified the rebodex app so that it can be called from rebol's console any time by typing rebodex. To show the title of the app, I need to store it in app-title: system/script/header/title so tha it could be used later in view/new/title dex reform [self/app-title version] That works but as you can see I have named the var name "app-title", but if I use "title" instead, the window caption would show weird stuff (vid code). Why ? REBOL [ Title: "Rebodex" Date: 23-May-2010 Version: 2.1.1 File: %rebodex.r Author: "Carl Sassenrath" Modification: "Rebtut" Purpose: "A simple but useful address book contact database." Email: %carl--rebol--com library: [ level: 'intermediate platform: none type: 'tool domain: [file-handling DB GUI] tested-under: none support: none license: none see-also: none ] ] rebodex.context: context [ app-title: system/script/header/title version: system/script/header/version set 'rebodex func[][ names-path: %names.r ;data file name-list: none fields: [name company title work cell home car fax web email smail notes updat] names: either exists? names-path [load names-path][ [[name "Carl Sassenrath" title "Founder" company "REBOL Technologies" email "%carl--rebol--com" web "http://www.rebol.com"]] ] brws: [ if not empty? web/text [ if not find web/text "http://" [insert web/text "http://"] error? try [browse web/text] ] ] dial: [request [rejoin ["Dial number for " name/text "? (Not implemented.)"] "Dial" "Cancel"]] dex-styles: stylize [ lab: label 60x20 right bold middle font-size 11 btn: button 64x20 font-size 11 edge [size: 1x1] fld: field 200x20 font-size 11 middle edge [size: 1x1] inf: info font-size 11 middle edge [size: 1x1] ari: field wrap font-size 11 edge [size: 1x1] with [flags: [field tabbed]] ] dex-pane1: layout/offset [ origin 0 space 2x0 across styles dex-styles lab "Name" name: fld bold return lab "Title" title: fld return lab "Company" company: fld return lab "Email" email: fld return lab "Web" brws web: fld return lab "Address" smail: ari 200x72 return lab "Updated" updat: inf 200x20 return ] 0x0 updat/flags: none dex-pane2: layout/offset [ origin 0 space 2x0 across styles dex-styles lab "Work #" dial work: fld 140 return lab "Home #" dial home: fld 140 return lab "Cell #" dial cell: fld 140 return lab "Alt #" dial car: fld 140 return lab "Fax #" fax: fld 140 return lab "Notes" notes: ari 140x72 return pad 136x1 btn "Close" #"^q" [store-entry save-file unview] ] 0x0 dex: layout [ origin 8x8 space 0x1 styles dex-styles srch: fld 196x20 bold across rslt: list 180x150 [ nt: txt 178x15 middle font-size 11 [ store-entry curr: cnt find-name nt/text update-entry unfocus show dex ] ] supply [ cnt: count + scroll-off face/text: "" face/color: snow if not n: pick name-list cnt [exit] face/text: select n 'name face/font/color: black if curr = cnt [face/color: system/view/vid/vid-colors/field-select] ] sl: slider 16x150 [scroll-list] return return btn "New" #"^n" [new-name] btn "Del" #"^d" [delete-name unfocus update-entry search-all show dex] btn "Sort" [sort names sort name-list show rslt] return at srch/offset + (srch/size * 1x0) bx1: box dex-pane1/size bx2: box dex-pane2/size return ] bx1/pane: dex-pane1/pane bx2/pane: dex-pane2/pane rslt/data: [] this-name: first names name-list: copy names curr: none search-text: "" scroll-off: 0 srch/feel: make srch/feel [ redraw: func [face act pos][ face/color: pick face/colors face system/view/focal-face if all [face = system/view/focal-face face/text search-text] [ search-text: copy face/text search-all if 1 = length? name-list [this-name: first name-list update-entry show dex] ] ] ] update-file: func [data] [ set [path file] split-path names-path if not exists? path [make-dir/deep path] write names-path data ] save-file: has [buf] [ buf: reform [{REBOL [Title: "Name Database" Date:} now "]^/[^/"] foreach n names [repend buf [mold n newline]] update-file append buf "]" ] delete-name: does [ remove find/only names this-name if empty? names [append-empty] save-file new-name ] clean-names: function [][n][ forall names [ if any [empty? first names none? n: select first names 'name empty? n][ remove names ] ] names: head names ] search-all: function [] [ent flds] [ clean-names clear name-list flds: [name] either empty? search-text [insert name-list names][ foreach nam names [ foreach word flds [ if all [ent: select nam word find ent search-text][ append/only name-list nam break ] ] ] ] scroll-off: 0 sl/data: 0 resize-drag scroll-list curr: none show [rslt sl] ] new-name: does [ store-entry clear-entry search-all append-empty focus name ; update-entry ] append-empty: does [append/only names this-name: copy []] find-name: function [str][] [ foreach nam names [ if str = select nam 'name [ this-name: nam break ] ] ] store-entry: has [val ent flag] [ flag: 0 if not empty? trim name/text [ foreach word fields [ val: trim get in get word 'text either ent: select this-name word [ if ent val [insert clear ent val flag: flag + 1] ][ if not empty? val [repend this-name [word copy val] flag: flag + 1] ] if flag = 1 [flag: 2 updat/text: form now] ] if not zero? flag [save-file] ] ] update-entry: does [ foreach word fields [ insert clear get in get word 'text any [select this-name word ""] ] show rslt ] clear-entry: does [ clear-fields bx1 clear-fields bx2 updat/text: form now unfocus show dex ] show-names: does [ clear rslt/data foreach n name-list [ if n/name [append rslt/data n/name] ] show rslt ] scroll-list: does [ scroll-off: max 0 to-integer 1 + (length? name-list) - (100 / 16) * sl/data show rslt ] do resize-drag: does [sl/redrag 100 / max 1 (16 * length? name-list)] center-face dex new-name focus srch show-names view/new/title dex reform [app-title version] insert-event-func [ either all [event/type = 'close event/face = dex][ store-entry unview ][event] ] do-events ] ]

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• Measuring Web Page Performance on Client vs. Server

  - by Yaakov Ellis

  I am working with a web page (ASP.net 3.5) that is very complicated and in certain circumstances has major performance issues. It uses Ajax (through the Telerik AjaxManager) for most of its functionality. I would like to be able to measure in some way the amounts of time for the following, for each request: On client submitting request to server Client-to-Server On server initializing request On server processing request Server-to-Client Client rendering, JavaScript processing I have monitored the database traffic and cannot find any obvious culprit. On the other hand, I have a suspicion that some of the Ajax interactions are causing performance issues. However, until I have a way to track the times involved, make a baseline measurement, and measure performance as I tweak, it will be hard to work on the issue. So what is the best way to measure all of these? Is there one tool that can do it? Combination of FireBug and logging inserted into different places in the page life-cycle?

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• Looking for SQL Server Performance Monitor Tools

  - by the-locster

  I may be approaching this problem from the wrong angle but what I'm thinking of is some kind of performance monitor tool for SQl server that works in a similar way to code performance tools, e.g. I;d like to see an output of how many times each stored procedure was called, average executuion time and possibly various resource usage stats such as cache/index utilisation, resultign disk access and table scans, etc. As far as I can tell the performance monitor that comes with SQL Server just logs the various calls but doesn't report he variosu stats I'm looking for. Potentially I just need a tool to analyze the log output?

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• Performance Counters Registry validation

  - by anchandra

  I have a C# application that adds some performance counters when it starts up. But if the registry HKEY_LOCAL_MACHINE-SOFTWARE-Microsoft-Windows NT-CurrentVersion-Perflib is corrupted (missing or invalid data), the operation of checking the existence of the performance counters (PerformanceCounterCategory.Exists(category) takes a really long time (around 30 secs) before finally throwing exception (InvalidOperation: Category does not exist). My question is how can i verify the validity of the registry before trying to add the performance counters (and what validity means) or if there is a way i can timeout the perf counter operations, so that it doesn't take 30 seconds to get an exception.

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• Entity Framework associations killing performance

  - by Chris

  Here is the performance test i am looking at. I have 8 different entities that are table per type. Some of the entities contain over 100 thousand rows. This particular application does several recursive calculations on the client so I think it may be best to preload the data instead of lazy loading. If there are no associations I can load the entire database in about 3 seconds. As I add associations in any way the performance starts to drastically decline. I am loading all the data the same way (just calling toList() on the entity attached to the context). I ran the test with edmx generated classes and self tracking entities and had similar results. I am sure if I were to try and deal with the associations myself, similar to how I would in a dataset, the performance problem would go away. On the other hand I am pretty sure this is not how the entity framework was intended to being used. Any thoughts or ideas?

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• Performance statistics hooks

  - by tinny

  Lets be honest, most software that developers produce has quite modest performance requirements. E.g. Systems perhaps serving 100's of requests per second, if that. But lets assume for a moment (or even dream) that you where perhaps involved in the "next big thing" (whatever that means) and you wanted to put some sort of performance statistics logging in place to help you out when all those users come flying in. Performance statistics logging, how would you approach this requirement? Perhaps you would use some sort of generic framework for this? Or roll your own solution? What would you log? How granular? Or would you not even bother putting anything in place and rather deal with this issue when it actually became an issue? It would be really interesting to hear your thoughts on this topic.

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• azure performance

  - by Dave K

  I've moved my app from a dedicated server to azure (and sql azure), and have noticed substantial performance degradation. obviously not having the database and web server on the same piece of hardware is much of it, but I'm curious what other people have found in migrating to azure, and if there is anything any of you would suggest I do to improve it. Right now I'm considering moving back to my dedicated server... So in summary, are there any rules of thumb for this, existing research (wasn't able to find much) or other pieces of advice on improving the performance of the app? has anyone else found the same to be true, and improved their site's performance in some way? it's built in C# on asp.net mvc 2. Thanks!

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• Is code clearness killing application performance?

  - by Jorge Córdoba

  As today's code is getting more complex by the minute, code needs to be designed to be maintainable - meaning easy to read, and easy to understand. That being said, I can't help but remember the programs that ran a couple of years ago such as Winamp or some games in which you needed a high performance program because your 486 100 Mhz wouldn't play mp3s with that beautiful mp3 player which consumed all of your CPU cycles. Now I run Media Player (or whatever), start playing an mp3 and it eats up a 25-30% of one of my four cores. Come on!! If a 486 can do it, how can the playback take up so much processor to do the same? I'm a developer myself, and I always used to advise: keep your code simple, don't prematurely optimize for performance. It seems that we've gone from "trying to get it to use the least amount of CPU as possible" to "if it doesn't take too much CPU is all right". So, do you think we are killing performance by ignoring optimizations?

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• Oracle, slow performance when using sub select

  - by Wyass

  I have a view that is very slow if you fetch all rows. But if I select a subset (providing an ID in the where clause) the performance is very good. I cannot hardcode the ID so I create a sub select to get the ID from another table. The sub select only returns one ID. Now the performance is very slow and it seems like Oracle is evaluating the whole view before using the where clause. Can I somehow help Oracle so SQL 2 and 3 have the same performance? I’m using Oracle 10g 1 slow select * from ci.my_slow_view 2 fast select * from ci.my_slow_view where id = 1; 3 slow select * from ci.my_slow_view where id in (select id from active_ids)

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• Game Object Factory: Fixing Memory Leaks

  - by Bunkai.Satori

  Dear all, this is going to be tough: I have created a game object factory that generates objects of my wish. However, I get memory leaks which I can not fix. Memory leaks are generated by return new Object(); in the bottom part of the code sample. static BaseObject * CreateObjectFunc() { return new Object(); } How and where to delete the pointers? I wrote bool ReleaseClassType(). Despite the factory works well, ReleaseClassType() does not fix memory leaks. bool ReleaseClassTypes() { unsigned int nRecordCount = vFactories.size(); for (unsigned int nLoop = 0; nLoop < nRecordCount; nLoop++ ) { // if the object exists in the container and is valid, then render it if( vFactories[nLoop] != NULL) delete vFactories[nLoop](); } return true; } Before taking a look at the code below, let me help you in that my CGameObjectFactory creates pointers to functions creating particular object type. The pointers are stored within vFactories vector container. I have chosen this way because I parse an object map file. I have object type IDs (integer values) which I need to translate them into real objects. Because I have over 100 different object data types, I wished to avoid continuously traversing very long Switch() statement. Therefore, to create an object, I call vFactoriesnEnumObjectTypeID via CGameObjectFactory::create() to call stored function that generates desired object. The position of the appropriate function in the vFactories is identical to the nObjectTypeID, so I can use indexing to access the function. So the question remains, how to proceed with garbage collection and avoid reported memory leaks? #ifndef GAMEOBJECTFACTORY_H_UNIPIXELS #define GAMEOBJECTFACTORY_H_UNIPIXELS //#include "MemoryManager.h" #include <vector> template <typename BaseObject> class CGameObjectFactory { public: // cleanup and release registered object data types bool ReleaseClassTypes() { unsigned int nRecordCount = vFactories.size(); for (unsigned int nLoop = 0; nLoop < nRecordCount; nLoop++ ) { // if the object exists in the container and is valid, then render it if( vFactories[nLoop] != NULL) delete vFactories[nLoop](); } return true; } // register new object data type template <typename Object> bool RegisterClassType(unsigned int nObjectIDParam ) { if(vFactories.size() < nObjectIDParam) vFactories.resize(nObjectIDParam); vFactories[nObjectIDParam] = &CreateObjectFunc<Object>; return true; } // create new object by calling the pointer to the appropriate type function BaseObject* create(unsigned int nObjectIDParam) const { return vFactories[nObjectIDParam](); } // resize the vector array containing pointers to function calls bool resize(unsigned int nSizeParam) { vFactories.resize(nSizeParam); return true; } private: //DECLARE_HEAP; template <typename Object> static BaseObject * CreateObjectFunc() { return new Object(); } typedef BaseObject*(*factory)(); std::vector<factory> vFactories; }; //DEFINE_HEAP_T(CGameObjectFactory, "Game Object Factory"); #endif // GAMEOBJECTFACTORY_H_UNIPIXELS

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• Apache2 benchmarks - very poor performance

  - by andrzejp

  I have two servers on which I test the configuration of apache2. The first server: 4GB of RAM, AMD Athlon (tm) 64 X2 Dual Core Processor 5600 + Apache 2.2.3, mod_php, mpm prefork: Settings: Timeout 100 KeepAlive On MaxKeepAliveRequests 150 KeepAliveTimeout 4 <IfModule Mpm_prefork_module> StartServers 7 MinSpareServers 15 MaxSpareServers 30 MaxClients 250 MaxRequestsPerChild 2000 </ IfModule> Compiled in modules: core.c mod_log_config.c mod_logio.c prefork.c http_core.c mod_so.c Second server: 8GB of RAM, Intel (R) Core (TM) i7 CPU [email protected] Apache 2.2.9, **fcgid, mpm worker, suexec** PHP scripts are running via fcgi-wrapper Settings: Timeout 100 KeepAlive On MaxKeepAliveRequests 100 KeepAliveTimeout 4 <IfModule Mpm_worker_module> StartServers 10 MaxClients 200 MinSpareThreads 25 MaxSpareThreads 75 ThreadsPerChild 25 MaxRequestsPerChild 1000 </ IfModule> Compiled in modules: core.c mod_log_config.c mod_logio.c worker.c http_core.c mod_so.c The following test results, which are very strange! New server (dynamic content - php via fcgid+suexec): Server Software: Apache/2.2.9 Server Hostname: XXXXXXXX Server Port: 80 Document Path: XXXXXXX Document Length: 179512 bytes Concurrency Level: 10 Time taken for tests: 0.26276 seconds Complete requests: 1000 Failed requests: 0 Total transferred: 179935000 bytes HTML transferred: 179512000 bytes Requests per second: 38.06 Transfer rate: 6847.88 kb/s received Connnection Times (ms) min avg max Connect: 2 4 54 Processing: 161 257 449 Total: 163 261 503 Old server (dynamic content - mod_php): Server Software: Apache/2.2.3 Server Hostname: XXXXXX Server Port: 80 Document Path: XXXXXX Document Length: 187537 bytes Concurrency Level: 10 Time taken for tests: 173.073 seconds Complete requests: 1000 Failed requests: 22 (Connect: 0, Length: 22, Exceptions: 0) Total transferred: 188003372 bytes HTML transferred: 187546372 bytes Requests per second: 5777.91 Transfer rate: 1086267.40 kb/s received Connnection Times (ms) min avg max Connect: 3 3 28 Processing: 298 1724 26615 Total: 301 1727 26643 Old server: Static content (jpg file) Server Software: Apache/2.2.3 Server Hostname: xxxxxxxxx Server Port: 80 Document Path: /images/top2.gif Document Length: 40486 bytes Concurrency Level: 100 Time taken for tests: 3.558 seconds Complete requests: 1000 Failed requests: 0 Write errors: 0 Total transferred: 40864400 bytes HTML transferred: 40557482 bytes Requests per second: 281.09 [#/sec] (mean) Time per request: 355.753 [ms] (mean) Time per request: 3.558 [ms] (mean, across all concurrent requests) Transfer rate: 11217.51 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 3 11 4.5 12 23 Processing: 40 329 61.4 339 1009 Waiting: 6 282 55.2 293 737 Total: 43 340 63.0 351 1020 New server - static content (jpg file) Server Software: Apache/2.2.9 Server Hostname: XXXXX Server Port: 80 Document Path: /images/top2.gif Document Length: 40486 bytes Concurrency Level: 100 Time taken for tests: 3.571531 seconds Complete requests: 1000 Failed requests: 0 Write errors: 0 Total transferred: 41282792 bytes HTML transferred: 41030080 bytes Requests per second: 279.99 [#/sec] (mean) Time per request: 357.153 [ms] (mean) Time per request: 3.572 [ms] (mean, across all concurrent requests) Transfer rate: 11287.88 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 2 63 24.8 66 119 Processing: 124 278 31.8 282 391 Waiting: 3 70 28.5 66 164 Total: 126 341 35.9 350 443 I noticed that in the apache error.log is a lot of entries: [notice] mod_fcgid: call /www/XXXXX/public_html/forum/index.php with wrapper /www/php-fcgi-scripts/XXXXXX/php-fcgi-starter What I have omitted, or do not understand? Such a difference in requests per second? Is it possible? What could be the cause?

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• openvpn TCP/UDP slow SSH/SMB performance

  - by Petr Latal

  I have question about strange behavior of my openVPN configuration on Debian lenny. I have 2 server configs (one proto tcp-server based and one proto udp based). ISP bandwidth is 7Mbit/7Mbit. When I uses proto tcp-server my download server rate is fine around 6,4 Mbit/s, but upload rate is about 3Mbit/s. When I uses proto udp, my download server rate is around 3Mbit/s and upload rate around 6,4Mbit/s. I tried to handle the MTU, MSSFIX and cipher on/off on server and client configs to synchronize rates, but without solution. Here is TCP based SERVER config: mode server tls-server port 1194 proto tcp-server dev tap0 ifconfig 11.10.15.1 255.255.255.0 ifconfig-pool 11.10.15.2 11.10.15.20 255.255.255.0 push "route 192.168.1.0 255.255.255.0" push "dhcp-option DNS 192.168.1.200" push "route-gateway 11.10.15.1" push "dhcp-option WINS 192.168.1.200" route-up /etc/openvpn/routeup.sh duplicate-cn ca /etc/openvpn/ca.crt cert /etc/openvpn/server.crt key /etc/openvpn/server.key dh /etc/openvpn/dh2048.pem log-append /var/log/openvpn.log status /var/run/vpn.status 10 user nobody group nogroup keepalive 10 120 comp-lzo verb 3 script-security 3 plugin /usr/lib/openvpn/openvpn-auth-pam.so system-auth persist-tun persist-key mssfix cipher BF-CBC Here is UDP based SERVER config: port 1194 proto udp dev tun0 local xx.xx.xx.xx server 11.10.15.0 255.255.255.0 ca /etc/openvpn/ca.crt cert /etc/openvpn/server.crt key /etc/openvpn/server.key dh /etc/openvpn/dh2048.pem log-append /var/log/openvpn.log status /var/run/vpn.status 10 user nobody group nogroup keepalive 10 120 comp-lzo verb 3 duplicate-cn script-security 3 plugin /usr/lib/openvpn/openvpn-auth-pam.so system-auth persist-tun persist-key tun-mtu 1500 mssfix 1212 client-to-client ifconfig-pool-persist ipp.txt Here is TCP/UDP based windows CLIENT config: remote xx.xx.xx.xx --socket-flags TCP_NODELAY tls-client port 1194 proto tcp-client #proto udp dev tap #dev tun pull ca ca.crt cert latis.crt key latis.key mute 0 comp-lzo adaptive verb 3 resolv-retry infinite nobind persist-key auth-user-pass auth-nocache script-security 2 mssfix cipher BF-CBC

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• video card performance monitoring?

  - by Dru

  Is there a 'top' like command for monitoring the GPU and memory usage of a video card? I am most interested in Linux commands, but and OS would be interesting. I strongly suspect that for a group of my systems the video cards are being under-utilized (but I have no idea by how much) and would like to re-allocate funds to other bottle-necks. We are using higher end cards, so the price difference between cards is significant. Thank you.

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• Bad performance issue on dedicated server

  - by Pierre Espenan

  I just subscribed to a dedicated server offer, and encounter some bad PHP execution performances. Actually, the time execution may be 2 times bigger than it is on my old mutualized server! I'm definitely not an expert in server management, so I'm wondering what I missed. Here are some stuff that can help you understand what's wrong here : My server (in french but easy to understand) : http://www.online.net/fr/serveur-dedie/dedibox-sc phpinfo(); output : http://jsfiddle.net/E8b7W/embedded/result/ PHP bench script (dedicated server) : http://jsfiddle.net/EhXzK/embedded/result/ PHP bench script (old mutualized) : http://jsfiddle.net/ANbWt/embedded/result/ Is it normal to get such poor performances after a kernel update and basics "apt-get install" for apache2 and php ? Thanks !

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• Performance monitoring for apache websites

  - by instigator

  I am after something that will monitor cpu/mem usage for different apache sites. I have a web server that runs multiple websites (on different domains) and wondering if there is a tool (hopefully web-base that can send email alerts) that will show the cpu and memory usage for each website.

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• Performance mitigations serving content from a UNC share via IIS 6

  - by codepoke

  I have a quad processor vmware instance running Windows 2003 and 1gb ethernet. I'm comparing serving the exact same heavy .NET 2.0 content from the local hard drive versus serving it from a UNC drive. If I use WCAT to load it down, I see about a 40% reduction in transactions/sec while serving from the UNC. Processor time barely moves from 45% and the NIC sits around 40% either way. I don't see any significant memory loading either way. Context Switches/Transaction, though, more than doubles when serving from the UNC. Pathlengths more than double as well, but I believe that's just an expression of the effect of context switching. All told, it looks like the bottleneck is processor switching while waiting on content from the UNC share. Is my experience about the norm? Is there some mitigation I might try? I twiddled HKLM\System\CurrentControlSet\Services\LanmanWorkstation\Parameters\MaxCmds a little bit per http://technet.microsoft.com/en-us/library/dd296694(WS.10).aspx, but to no obvious effect. I kind of doubt my problem is lack of connections, but rather just the act of switching from thread to thread while waiting on data.

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• OpenVPN performance: how many concurrent clients are possible?

  - by Steffen Müller

  I am evaluating a system for a client where many OpenVPN clients connect to a OpenVPN server. "Many" means 50000 - 1000000. Why do I do that? The clients are distributed embedded systems, each sitting behind the system owners dsl router. The server needs to be able to send commands to the clients. My first naive approach is to make the clients connect to the server via an openvpn network. This way, the secure communication tunnel can be used in both directions. This means that all clients are always connected to the server. There are many clients summing up over the years. The question is: does the OpenVPN server explode when reaching a certain number of clients? I am already aware of a maximum TCP connection number limit, therefore (and for other reasons) the VPN would have to use UDP transport. OpenVPN gurus, what is your opinion?

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• Windows XP IIS5 performance across Network

  - by davidsleeps

  Hi, Just wondering whether Windows XP with IIS5 running needs any extra configuration to be suitable as a web server...I'm not considering using this for anything other than a web server on a small network for testing development etc One of the reasons I'm concerned though is that we've deployed an asp.net application to a workstation with Windows XP, and running the application using a browser on the machine (so accessing it through localhost/myApp/page.aspx and not accessing it through the network) runs the application really quickly. If another machine on the LAN accesses the same page (using http://ComputerName/myApp/page.apx) then the whole application runs noticeably slower...yet the computers are connected on a gigabit switch...so I wouldn't have thought network latency or bandwidth could be an issue... Does Windows XP need anything etc enabled or changed or network settings for it to work correctly?

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• Slow NFS transfer performance of small files

  - by Arie K

  I'm using Openfiler 2.3 on an HP ML370 G5, Smart Array P400, SAS disks combined using RAID 1+0. I set up an NFS share from ext3 partition using Openfiler's web based configuration, and I succeeded to mount the share from another host. Both host are connected using dedicated gigabit link. Simple benchmark using dd: $ dd if=/dev/zero of=outfile bs=1000 count=2000000 2000000+0 records in 2000000+0 records out 2000000000 bytes (2.0 GB) copied, 34.4737 s, 58.0 MB/s I see it can achieve moderate transfer speed (58.0 MB/s). But if I copy a directory containing many small files (.php and .jpg, around 1-4 kB per file) of total size ~300 MB, the cp process ends in about 10 minutes. Is NFS not suitable for small file transfer like above case? Or is there some parameters that must be adjusted?

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• Performance problem with Win Server 2008 at vbox on Ubuntu 9.10 Server

  - by Diskilla

  Hey, i´ve got an Ubuntu 9.10 Server and tried to install Windows Server 2008 in a virtual machine. The Problem is, the Server has got 8 cores, but the virtual machine seems to have problems with that. The VM is very slow and not really usable if i set the VM-config to more than one core. Is it set to only one core everything works fine, but thats not a solution because I bought the Server with several cores for a reason... Does anybody know this problem or has got a solution? I feel like I read the entire internet via Google... no solution found. Greetz Diskilla P.S.: I´m from Germany and it´s kind of hard to ask in english :-) I hope I din´t make that much mistakes.

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• Using Performance Monitor To Get IIS7 Response Turnaround Time

  - by alphadogg

  I have a MVC2 web application on W2KR2/IIS7 that I'd like to benchmark/monitor. Some XHR requests by a browser-based client are suddenly taking 8-10 sec when they used to take much less time (as per Chrome Developer Tool timings). The underlying SQL Server queries, using the same params, runs in 1.4s according to total execution time client statistics from SSMS. I'm assuming that there are various counters that can specifically dissect time taken/waiting/processing between IIS7 itself and the web application? For example, can I check how long it takes to get a response from IIS7 app and DB? How about how long it takes to serve IIS7?

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• Performance Tweaks for Adobe After Effects?

  - by Roy Rico

  I am a new user to Adobe After Effects. I have a 2 year old system, which i just upgraded to 8GB of ram (from 3GB). I've also switched my windows page file to a seperate physical drive. I'm looking for additional suggestions for After Effects.

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• Basic multicast network performance problems

  - by davedavedave

  I've been using mpong from 29west's mtools package to get some basic idea of multicast latency across various Cisco switches: 1Gb 2960G, 10Gb 4900M and 10Gb Nexus N5548P. The 1Gb is just for comparison. I have the following results for ~400 runs of mpong on each switch (sending 65536 "ping"-like messages to a receiver which then sends back -- all over multicast). Numbers are latencies measured in microseconds. Switch Average StdDev Min Max 2960 (1Gb) 109.68463 0.092816 109.4328 109.9464 4900M (10Gb) 705.52359 1.607976 703.7693 722.1514 NX 5548(10Gb) 58.563774 0.328242 57.77603 59.32207 The result for 4900M is very surprising. I've tried unicast ping and I see the 4900 has ~10us higher latency than the N5548P (average 73us vs 64us). Iperf (with no attempt to tune it) shows both 10Gb switches give me 9.4Gbps line speed. The two machines are connected to the same switch and we're not doing any multicast routing. OS is RHEL 6. 10Gb NICs are HP 10GbE PCI-E G2 Dual-port NICs (I believe they are rebranded Mellanox cards). The 4900 switch is used in a project with tight access control so I'm waiting for approval before I can access it and check the config. The other two I have full access to configure. I've looked at the Cisco document[2] detailing differences between NX-OS and IOS w.r.t multicast so I've got some ideas to try out but this isn't an area where I have much expertise. Does anyone have any idea what I should be looking at once I get access to the switch? [1] http://docwiki.cisco.com/wiki/Cisco_NX-OS/IOS_Multicast_Comparison

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• Performance difference between compiled and binary linux distributions/packages

  - by jozko

  I was searching a lot on the internet and couldn't find an exact answer. There are distros like Gentoo (or FreeBSD) which does not come with binaries but only with source code for packages (ports). The majority of distros uses binary backages (debian, etc.). First question: How much speed increase can I expect from compiled package? How much speed increase can I get from real world packages like apache or mysql? i.e. queries per second? Second question: Does binary package means it does not use any CPU instructions that was introduced after first AMD 64bit CPU? With the 32bit packages does it mean that the package will run on 386 and basically does not use most of the modern CPU instructions? Additional info: - I am not talking about desktop, but server environment. - I dont care about compile time - I have more servers, so speed increase more than 15% is worth for using source code packages - Please no flamewars. Thank you very much

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