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

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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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7answers
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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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1answer
1k 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
495 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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2answers
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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2answers
634 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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2answers
790 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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2answers
172 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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2answers
326 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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3answers
707 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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4answers
543 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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2answers
990 views

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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1answer
490 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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2answers
967 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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3answers
1k views

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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2answers
320 views

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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1answer
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
453 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
888 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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2answers
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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2answers
476 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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3answers
256 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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3answers
1k views

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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3answers
92 views

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 ...
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4answers
895 views

How can I make this setup faster?

Hey StackOverlow Community, I currently am using some software that stores a bunch of XML files. All the files are under 25k bytes. The makers of the software state the performance is based on ...
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3answers
4k views

What are your tricks for optimizing your Subversion configuration?

For a Linux or Windows system, what tricks do you do to optimize your Subversion server? The following are my current tricks for a Linux system serving over Apache with HTTPS and backed by Active ...
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3answers
30k views

Tuning (and understanding) table_cache in mySQL

I ran the excellent MySQL performance tuning script and started to work through the suggestions. One I ran into was TABLE CACHE Current table_cache value = 4096 tables You have a total of 1073 ...
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5answers
198 views

Network Monitoring and Filtering [closed]

As the IT administrator for my company I have been tasked with deciding what traffic to filter, shape, and othewise monitor on our network. What protocols, applications, and other network traffic do ...
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1answer
199 views

Outbound HTTP performance tuning recommendations

I'll detail my exact setup below, but general recommendations for a better web-browsing experience will be useful. A nice checklist of things to try would be great! I have 600 users on a single site ...
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1answer
1k views

How to use oprofile to find the bottle-neck of our web server?

Updated: ================================================================ I finally found the reason with oprofile. It was because the routing cache of Symfony. We have lots of pages with different ...
89
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4answers
109k views

FreeBSD performance tuning. Sysctls, loader.conf, kernel

I wanted to share knowledge of tuning FreeBSD via sysctl.conf / loader.conf / KENCONF / etc. It was initially based on Igor Sysoev's (author of nginx) presentation about FreeBSD tuning up to ...
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6answers
1k views

MySQL performance tuning

I'm looking for a succinct list of common pitfalls and optimizations for tuning a MySQL server as used for mid-size websites. In general, the type of advice I'm looking for here is information that ...
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3answers
4k views

How can I improve NFS performance on a gigabit LAN?

I have a Solaris 10 server with a Mac OS X clients on a gigabit LAN. The Solaris server exports a RAID-Z backed NFS share and all the clients connect to it. However, transferring files is slower ...
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7answers
23k views

yslow says etags are misconfigured. how to configure etags properly on IIS7?

running ySlow on a website I support, I noticed it reported that the etags are misconfigured for the site images (e.g. *.jpg, *.png, *.gif). Can anyone help explain what I have to do to get IIS7 ...
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1answer
743 views

Virtual server freeze (apache ?)

I rent a small virtual server at 1und1.de. (Link, but German only) (2GB RAM dynamic, 512MB at least, 20 GB HDD) I choose to run a Ubuntu 8.04 LTS as operating system (64 Bit). I installed apache2 + ...
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1answer
2k views

How to change the SWAP file disk in Mac OS X?

I have moved my system on andexternal Raid 1 enclosure attachet to my iMac through Firewire 800 (the best an iMac can do ;-( ) ... I'd like to move the swap on the internal disk in order to increase ...
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2answers
723 views

What are the optimal tuning values for RHEL 5.3 Xen kernel on a Dell 2950? [closed]

How to do Linux Tuning and Performance? any one has done for xen kernel ?
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4answers
4k views

Configuring NTFS file system for performance

We have an application that is planning to store around 1.1TB of XML files which average 8.5kb in size. These represent a rolling 18 months of data, with around 200,000 new files being created every ...
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2answers
3k views

Faster IMAP searching for Courier IMAP server on Linux

I am looking for tips on improving IMAP search performance using Courier IMAP. The current version is 4.2.1. Unlike in the question "Fast search for IMAP?", I'm specifically looking for server side ...
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13answers
6k views

Postfix performance

Running postfix on ubuntu, sending alot of mail ( ~ 1 million messages ) per day. loads are extremly high but not much in terms of cpu and memory load. Anyone in a similiar situation and know how to ...
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6answers
2k views

Looking for comparisons of disk i/o for a dedicated MySQL server

We hired a consultant to help us increase the capacity of our MySQL cluster, and the first thing (almost only thing) he did was to measure the disk i/o speed of our servers. I am interested in a ...
2
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1answer
120 views

What resources on OpenVMS Performance Management do you recommend?

I'm looking for details about how to measure OpenVMS performance, such as what all of the different reported statistics mean and how to adjust for them. In particular, I'm currently investigating ...
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8answers
6k views

Hard Drive Speed: RPM vs. Cache

When trying to choose a SATA magnetic hard drive (not SSD) for high performance for both random and linear access, which should be the primary factor? For example: would a 10k RPM drive with 16MB ...
7
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3answers
2k views

NetBackup Multiplexing for Oracle RMAN Backups

My question is... what multiplexing factor in NetBackup is recommended / do you use for Oracle RMAN backups over 1Gb/s management network to LTO3? JB Background: With enterprise backup tools like ...
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666 views

Trouble shooting wireless signal performance

I just performed a wireless network scan and my primary wireless route broadcasts a consist 70 DBm signal. I added a range extender that increases or decreases the signal 65 DB (Not sure how the DB m ...
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4answers
267 views

Exchange 2003 I/O Troubles

We have some internal processes that send email to our Exchange 2003 system (on Win2K3 R2 32bit). Recently they have been intermittently failing with various errors -- boiled down they report ...
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3answers
1k views

Database I/O acceleration using solid state drives

What is the experience improving database performance using solid-state drives (particularly for PostgreSQL databases) such as HP's IO Accelerator? Did you see any marked improvements?
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3answers
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Oracle tuning optimizer index cost adj and optimizer index caching

What is the correct way to set the optimizer index cost adj parameter for Oracle. As a developer I have observed huge performance improvements as this parameter is lowered. Common queries are ...