Performance tuning is the process of modifying a system to improve its efficiency. This is also known as optimizing.

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Good VPS In London? [duplicate]

Possible Duplicate: Who is your favorite VPS Provider? I'm looking to rent a Windows VPS in (or near) London, England. I want to be able to do performance testing of our North American web ...
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VPS hosting is very slow. What's the bottleneck?

I've setup a new VPS hosting, to run a Drupal website but it is extremely slow. It is Ubuntu 10, Apache, php5.2 I've enabled Multi-Processing Module (MPM) module and configured it as follows: ...
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660 views

Diagnosing poor performance on IIS / ASP.NET / MSSQL app

I'm trying to diagnose the cause of poor performance from a third-party web application we've deployed; the environment is: ASP.NET on IIS, Windows 2003 Server SQL Server 2008 on a separate Windows ...
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Find out which task is generating a lot of context switches on linux

According to vmstat, my Linux server (2xCore2 Duo 2.5 GHz) is constantly doing around 20k context switches per second. # vmstat 3 procs -----------memory---------- ---swap-- -----io---- -system-- ...
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307 views

What are some current and relevant benchmark tools for Linux?

I'm specifically interested in benchmarks that approximate or target real in the wild usage scenarios. My main areas of focus are latency, network performance (incoming data over sockets). ...
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3k views

How-to manage a MySQL table with over 2 million records

I have an InnoDB table running on MySQL 5.0.45 in CentOS. To make matters worse it is all running in a virtual machine. There are multiple tables that have the probability of exceeding 2 million ...
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2answers
154 views

What to seek/avoid in a hosted server monitoring service?

I'm looking for hosted monitoring solution (CPU, memory, disk, loads, mysql, replication network etc..) for a group of servers on Amazon EC2 /Scalr (app, mysql, load balancer). So far I found ...
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5k views

How to see actual size of tcp send and receive buffers?

we are on a debian system and are trying to tune the tcp/ip stack to our needs. We all know that you can set the maximum tcp buffer size with some kernel parameters like this: net.ipv4.tcp_wmem = ...
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1answer
295 views

IIS 7.0 - responses throttled to 500ms blocks?

Scenario: ASP.NET MVC wep app sitting on my local machine (Vista Ultimate, IIS 7.0), nothing going on except one user (me) logged in and viewing an index page. The page includes 9 dynamic images drawn ...
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How to make setting of kern.ipc.somaxconn persistent?

Want to rise value of kern.ipc.somaxconn With sysctl works ok $ sudo sysctl kern.ipc.somaxconn=2048 $ kern.ipc.somaxconn: 128 -> 2048 check it: $ sysctl -a|grep somaxconn ...
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980 views

Apache Config for High Page View, Long Session Users - KeepAlive and MaxRequest variables

I am currently running a web app that sees several (~15) users logging in once each day, and then leaving the web app open where it automatically refreshes with new content every 5 minutes. Each user ...
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1answer
939 views

MySQL's innodb_file_per_table and “too many tables”

I'm running MySQL (5.0 but I don't think it matters for anything after 4.1) and I've seen advice about using the innodb_file_per_table configuration option for InnoDB tables. This is usually done so ...
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3answers
1k views

Can tail slow down log writing speed on Linux (ext3)?

I'm wondering if tailf can generate blocking I/O which will slow down server responsiveness due to logging. For ex. assuming the following setup: Debian 5.1 linux server (foo) which is managed via ...
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1answer
90 views

Profiling windows performance

I am used to using profilers for software development. I have had multiple windows pcs which all have slowed down over time, as well as had work PCs become slower. I understand this is probably the ...
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1k views

How to make SSRS 2005 run fast in general?

Are there any general rules/tips which we can use to run Sql Server Reporting Services 2005 reports faster? I have been tuning the Tsql behind the reports but does there exist any SSRS specific ...
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544 views

It is possible move a specific file to the beginning of the disk?

It is possible move a specific file to the beginning of the disk? I want to move my virtual machine disk files (virtual disk) to the beginning of the disk to improve disk access performance. I believe ...
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1answer
3k views

What is the best TCP congest algorithm to use for a mobile device?

Given the multitude of TCP algorithms available now and the rise of Linux based mobile devices, what are ideal algorithm(s) to consider? From reading of the various implementations, Veno and ...
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229 views

How do I increas MySQL Performance by throwing Memory at it?

I have a machine with 1 GB of RAM and have set apache to use STARTSERVER OF 150, and MAXCLIENTS of 150, only half is used so I still have about 500 MB more of spare RAM. I want MySQL to use this up as ...
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835 views

On Windows it's possible to monitor the hard faults for each process?

I'm tuning a production server that runs Windows Server 2003 SP2. I want to monitor the hard faults (read an write separately) for each process. Is it possible?
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Further Performance Tuning on Medium SharePoint Farm?

I figured I would post this here, since it may be related more to the server configuration than the SharePoint configuration or a combination of both? I'm open for ideas to try, or even feedback on ...
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1answer
452 views

Specific apache + mysql settings for a light-weight site

I have a small website with a Joomla and a Moodle set up. It seems that both of these are very slow. The server (CentOS release 5.5 (Final)) is a virtual dedicated server with about 2GB of ram. I ...
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1answer
477 views

Why is MySQL table_cache full but never used

I have been using the tuning-primer.sh script to tune my my.cnf settings. I have most things working well but the part about TABLE CACHE makes no sense: TABLE CACHE Current table_cache value = 900 ...
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2k views

How can I tell which page is creating a high-CPU-load httpd process?

I have a LAMP server (CentOS-based MediaTemple (DV) Extreme with 2GB RAM) running a customized Wordpress+bbPress combination . At about 30k pageviews per day the server is starting to groan. It ...
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Simple queries occasionally running very slowly

I have some very simple queries that occasionally run very slowly. The table viewed_sites has about 10 - 20 rows. Running EXPLAIN ANALYZE always gives a runtime of less than 3 milliseconds. When ...
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1answer
146 views

Need help tuning Mysql and linux server

We have multi-user application (like MailChimp,Constant Contact) . Each of our customers has it's own contact's list (from 5 to 100.000 contacts). Everything is stored in one BIG database (currently ...
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Is it OK to run perfmon on production servers? And why?

Or should perfmon be limited to a Dev/QA server with load tests that simulate production activity? I'd like to run perfmon for two days (like Sql Server master Brent Ozar suggests) to get an overall ...
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2k views

AIX network parameters to close TCP sockets of unplugged devices

We have an AIX box, running what we call in banking "ATM Switch" not the ATM networking switch, but the bank ATM driver. where we have some ATM machines connected to two server processes. The problem ...
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1answer
547 views

Webserver: Performance impact when storing session files on /dev/shm

I have a website runing on a typical setup: Linux, Apache, PHP, MySQL. However, what's not typical about it, is that it's getting tons of traffic (400,000+ visits a day) and so, efficiency is becoming ...
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1k views

SQL Server 2005 standard filegroups / files for performance on SAN

I submitted this to stack overflow (here) but realised it should really be on serverfault. so apologies for the incorrect and duplicate posting: Ok so I've just been on a SQL Server course and we ...
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638 views

perf tuning for ESX vmfs3 on RAID

looking for recommendations on ESX4 OS - VMFS version3: RAID-5 : matching the stripe size with VMFS block size? (64K, 128K etc) RAID controller options: "adaptive read ahead, write-back" on PERC 6i ...
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997 views

Webalizer causing high CPU load

We use webalizer to generate reports on our Apache access logs - it is useful in conjunction with Google Analytics. The problem is that webalizer uses ALOT of CPU when running. If I run top I can see ...
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176 views

mysql settings - using the available resources

I've got a lot of processing work I need to run on a mysql server. I've installed mysql 5.1.45-community on a Win 2008 64bit. Its running on a Xeon, 3ghz 6 processors with 8 gig ram. It doesn't ...
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370 views

DB2 insert performance - How to measure

[From stackoverflow] Im trying to find a way to speedup my inserts to a DB2 9.7.1 (ubuntu linux) Im watching vmstat and trying to gather some statistics via the db2 get snapshot commands but im not ...
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779 views

Increase the performance of sort command on a multi-processor Sun Solaris box

I have a bunch of (rather large i.e. >100MB) comma separated files which needs sorting on 4 processor box with SunOS 5.10 Sort appears to run rather slow (minutes) I am wondering if there is any way ...
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558 views

Optimizing MySQL server

I need help in optimizing my my.cnf configuration file. I have two servers connected directly through LAN network (1 GBit/s). The first server is an Apache web server and the second one is a MySQL ...
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What are the implications of the SHOWPLAN permission on SQL Server 2005?

A user wants the SHOWPLAN permission in order to use Execution Plans to tune a query. What are the implications of this permission. Is it safe to grant a user? I've seen the security note here, and ...
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591 views

File Control Bytes / Sec in Server 2003 is sometimes VERY high - is this a problem?

We are trying to track down performance problems on our server, and when running SPA or the performance monitor the counter for "File Control Bytes / Sec" sometimes skyrockets, typically about once ...
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1k views

How to preserve sysprep from changing Default User settings

I'm having diffculties configuring 20 new Dell Vostro minis here. I set up one of them with my preferred OS, applications and settings, especially the Visual Effects Settings of Windows XP. I set them ...
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How to optimize iptables for high DNS traffic?

How to optimize iptables for high DNS traffic? I have a dedicated linux server acting as bridged firewall using iptables. Recently behind firewall was deployed DNS server with high load and firewall ...
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How do I objectively measure an application's load on a server

All, I'm not even sure where to begin looking for resources to answer my question, and I realize that speculation about this kind of thing is highly subjective. I need help determining what class of ...
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1k views

What are some TCP tuning tips for a service hit by iPhone clients on mobile networks like 3G?

I am a developer that has the good+bad situation of designing a network service that will be hit very hard by iPhone clients. The iPhone app has over 10MM downloads in the past year and now I'm ...
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1answer
1k views

Very long (>300s) request processing time on Apache Server serving static content from particular IP's

We are running an Apache 2.2 server for a very large web site. Over the past few months we have been having some users reporting slow response times, while others (including our resources, both on ...
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1answer
464 views

postgresql - cache preferences per table/db

i'm curious if there is any way to hint postgresql which data should be more likely cached in memory. in my scenario the server would be handling mostly read traffic, whole data-set is much larger ...
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4answers
2k views

Lower Maximum Possible Memory Usage

I've been using MySQLTuner to optimize my database, and the only problem I am having is: [!!] Maximum possible memory usage: 14.8G (126% of installed RAM) I'm not sure what I should be ...
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1answer
966 views

apache and ajp performance

I have an apache sitting in front of two tomcat app servers(one on the same physical server, the other on a different one) that does time consuming work(0.5 sec to 10sec per request). The apache http ...
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3k views

Interpretation of non-zero vmstat “bi/bo” values

What are useful rule-of-thumbs with regard to interpreting non-zero vmstat "bi/bo" values? When are the values "okay" and when are they an indication of that the system is under heavy stress? The ...
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531 views

How well does Windows 7 Handle High Bandwidth-Delay Product Networks

As WAN bandwidths increase default network settings in older operating systems are less and less able to efficiently use the network. A description of the problem with high bandwidth-delay product ...
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261 views

How to profile for HDD usage pattern?

I'm considering upgrading the storage system for some of my servers, and all the guides and manuals advise to consider the storage usage patterns of your app before deciding on a (RAID? SSD? iSCSI? ...
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Faster Option: Redirect via PHP to PHP or Apache mod rewrite redirect to PHP?

I want to determine if using Apache's .htaccess mod rewrite is a faster way to redirect to a PHP file, compared to redirecting from one PHP file to another, using the header redirect core function of ...
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SQL Server Tuning Resources

I want to learn more about tuning SQL Server instances (2005/2008), does anyone have any good resources they can point me at? Dave NB: I'm talking about the hardware/instance configuration side of ...