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

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Very low performance of raid6

I noticed that writing to raid-6 is very low, but when I make tests with hdparm the speed is reasonable: dd if=/dev/zero of=/store/01/test.tmp bs=1M count=10000 Gives: 50Mb/s or even less. The ...
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1answer
326 views

Do IIS App Pools using Network Service account share memory?

We're trying to tune our IIS farm, and I'm trying to get my head around how Windows allocates resources in our current setup. We have a pretty standard layout. We host 30+ ASP/ASP.NET sites on our ...
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5answers
420 views

Does Overclocking Anything Shorten It's Life? [closed]

From a business standpoint... If intel could take a 3.0 GHz CPU, and overclock it to 4.0 GHz - whilst still covering their warranty they would do so. It's absolutely free and makes the chip perceived ...
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1answer
6k views

Best sysctl.conf configuration for high load - extremely busy content streaming server

What is the best sysctl.conf configuration for a high load, extremely busy content streaming server ? The server fetches the content from remote servers like amazon, s3, etc. then uses php to ...
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1answer
641 views

COM+/Desktop Heap errors in IIS affecting sites at random?

We have a Win2K3 server that is hosting 30+ sites. Each site is configured to have its own unique application pool -- so that we can manually recycle specific sites if needed and not kill sessions ...
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3answers
347 views

Config MySQL to maximum speed and memory

I have a server, 8 cores, 12 GB RAM. This server is only used to run MySQL. So, help me config /etc/my.cnf to maximum speed, memory for MySQL.
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444 views

server benchmarking with apache benchmark

We are testing one of our production server with ab and what we found is apr_socket_recv: Connection timed out (110) Total of 176 requests completed after some time above output.That means the ...
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2answers
531 views

Solaris: Increase TCP's Initial Congestion Window to 10 segments (tcp slow-start)

How can the Initial Congestion Window be increased to 10? It seems it can be done with TCP_INIT_CWND, but I don't know how to do that.
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3answers
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Filesystem/Options for intensive random I/O

I'm planning to (privately) deploy a server that will be hammered with random I/Os in files ranging from 100MB to 50GB. The requests will range from 128 KB to 4MB. The profile will be 50:50 concerning ...
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1answer
4k views

What is bottleneck of my Apache server?

$netstat -anp | grep :80 | grep TIME_WAIT | wc -l 840 $netstat -anp |grep :80 | grep ESTABLISHED | wc -l 50 memory usage : 850MB / 1000MB apache2.conf contains.. <IfModule ...
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3answers
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Linux's best filesystem to work with 10000's of files without overloading the system I/O

It is known that certain AMD64 Linuxes are subject of being unresponsive under heavy disk I/O (see Gentoo forums: AMD64 system slow/unresponsive during disk access (Part 2)), unfortunately have such ...
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7answers
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Linux tool/command to check file system performance

What is the simplest way to check read/write performance to a specific location (e.g. a mounted iSCSI device). I suspect I can't use hdparm because that's lower level. Am I right?
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PostgreSQL - count() performance and how to tweak it?

I've done some reading in google and the only thing I did was get myself confused. Some of the people say that count() is slower with many records, others say you can cache the number or even use ...
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2answers
917 views

How to tune down the Hyperic built-in postgresql database for a small setup

We are testing out Hyperic 4.5.1 in a quite small environment for now. Currently there are just 1-5 agents and there probably won't be any more than 10-15. When I run ps ax there are 20(!) postgres ...
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3answers
621 views

Extreme fine tuning MySQL performance wise on a Linux server

I would like to know all of the key points where MySQL can be fine tuned performance wise on a Linux server through my.cnf or through other methods, libraries and tools. Tips and tricks and shady ...
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2answers
324 views

dedicated apache httpd server configuration and performance tuning

I have the following dedicated box that I only install apache httpd server on, what parameters in httpd.conf should I tune to achieve max performance? cat /proc/cpuinfo shows 8 processors(only ...
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125 views

Where to start fixing an IO Bottle neck in SQL Server?

I recently came across an interesting article that went over using IO statistics to identify the causes of performance issues. After examining my statistics i came to the determination that i had a ...
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5answers
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Performance Tuning a High-Load Apache Server

I am looking to understand some server performance problems I am seeing with a (for us) heavily loaded web server. The environment is as follows: Debian Lenny (all stable packages + patched to ...
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5answers
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Windows 7 network performance tuning for LAN

I want to tune Windows 7 TCP stack for speed in a LAN environment. Bit of background info: I've got a Citrix XenServer set up with Windows 2008R2, Windows 7 and Debian Lenny with Citrix kernel, ...
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2answers
183 views

How do I calculate the amount of tuning needed for my server?

I have a server which is running a few discrete Python, Java application which most of the time imports data into a PostGreSQL database. I would like to know from people out there who have experience ...
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3answers
777 views

How to measure req/sec by analyzing apache logs

I want to measure the justify stress-test result on production env. How to measure req/sec by analyzing apache logs? apache2.2 LogFormat "%v:%p %h %l %u %t \"%r\" %>s %O \"%{Referer}i\" ...
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1answer
793 views

How to remove the pause during JBoss 5.1.0 GA boot between ProfileServiceBootstrap and AnnotationCreator?

I've managed to strip down my JBoss profile enough that it boots in 1.5 minutes. I started with the web profile and started pulling out stuff I didn't need. The bulk of my boot time can be seen here: ...
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805 views

performance wise htaccess

hese's the my htaccess template, i wonder if anything could be added to increase website performance.. # Defaults AddDefaultCharset UTF-8 DefaultLanguage en-US ServerSignature Off FileETag None ...
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2answers
892 views

Linux RAID-0 performance doesn't scale up over 1 GB/s

I have trouble getting the max throughput out of my setup. The hardware is as follow : dual Quad-Core AMD Opteron(tm) Processor 2376 16 GB DDR2 ECC RAM dual Adaptec 52245 RAID controllers 48 1 TB ...
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2answers
6k views

switching to worker mpm for apache 2 on ubuntu

How to switch from prefork mpm to worker mpm on ubuntu server? how to roll back if there is any problem? root@myserver:~# apache2ctl -l Compiled in modules: core.c mod_log_config.c mod_logio.c ...
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47 views

Why did my newly added index show up as a 'statistic'?

We are attempting to tune our SQL Server 2005 database as we frankly have no indexing on our tables and our CPU usage is starting to max out at 100%. We have ran SQL Server profiler for a 3 hour ...
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2answers
1k views

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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4answers
16k views

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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1answer
320 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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3answers
4k 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
157 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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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
319 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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2answers
3k views

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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2answers
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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
996 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
2k 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 ...
2
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1answer
91 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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3answers
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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3answers
724 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 ...
4
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1answer
5k 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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2answers
235 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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3answers
946 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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2answers
2k views

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
478 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
491 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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2answers
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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133 views

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
152 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 ...