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

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Tuning JavaVM on AWS/EC2

there's some specific tuning JVM configuration for AmazonWS/EC2 building blocks (small, large...)? Somebody have suggestions for tuning JVM running on these machine profiles? Regards, And Past
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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 ...
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2answers
97 views

Server configurations for hosting MySQL database

I have a web application which uses a MySQL database hosted on a virtual server. I've been using this server when I started the application and when the database was really small. Now it has grown and ...
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2answers
247 views

I'm seeing performance problems with postfix accepting mail when the queue is already large, any suggestions?

I use postfix to do final delivery for a mail system I've written. So this postfix installation only accepts mail from me, and bounces. When the postfix queue is empty, it can accept a piece of mail ...
0
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1answer
817 views

Oracle Application Server Performance Monitoring and Tuning (CPU load high)

Oracle Application Server Performance Monitoring and Tuning (CPU load high) i have just hired by a company and my boss give me a performance issue to solve as soon as possible. I don't have any ...
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2answers
361 views

Tuning MySQL and Linux to reduce maximum response time specifically

We have a MySQL-based application that is very response time sensitive. A MySQL stored procedure needs to respond on average in less than 10 milliseconds and the maximum acceptable response time is 50 ...
4
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1answer
496 views

Ubuntu HTTP latency falling into strange quantiles

I have an Ubuntu 10.10 server with plenty of RAM, bandwidth and CPU. I'm seeing a strange, repeatable pattern in the distribution of latencies when serving static files from both Apache and nginx. ...
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1answer
244 views

Windows 2003 IIS webserver (testserver) is slow

I have a test environment for my Asp.Net 4.0 web applications. It runs on a Dedicated Windows 2003 Webserver (IIS 6) But it's slow! The machine never has 100% cpu and the same for memory. When I run ...
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2answers
1k views

Apache with prefork model using 1000 MB memory per process

I am currently working on a site which uses Apache running on the prefork memory model. The following is the configuration from httpd.conf <IfModule prefork.c> StartServers 30 ...
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3answers
2k views

Building a 1,000M row MySQL table

This question is reposted from Stack Overflow based on a suggestion in the comments, apologies for the duplication. Questions Question 1: as the size of the database table gets larger how can I tune ...
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1answer
576 views

Improving TCP performance over a network with small packet loss

I’m trying to improve my TCP throughput over a “high delay network”, with some packet drops, between Linux machines. I set tcp_mem, tcp_wmem and tcp_rmem to “8192 20530752 20530752”. I set rmem_max, ...
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4answers
422 views

Increase application performance on Amazon AWS

I've got a client with an MVC v1 (.NET) application running on a micro instance. On this instance, I've got .NET, IIS 7.5, and MS SQL Server 2008 running to handle the application. The client has ...
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1answer
675 views

How Do I Troubleshoot Exim Mail Retry Issues?

My server is encountering high CPU load (like almost pegged at 100%) so much that the Apache service can't run and we get Apache 500 errors. We used a script to catch this and this is where we ...
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1answer
1k views

Windows Server 2008 File Server Performance Tuning

I am running a Microsoft Windows Server 2008 R2 File Server on our network. It seems that there are many times where accessing the data from the server is really slow, sluggish, or non-responsive. ...
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4answers
10k 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
368 views

Trim out useless apache modules

I'm running a shared hosting environment with about 100 sites - I just took a peek at all the modules apache is loading/using, some of these I don't know what they are or do or if they are useful at ...
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4answers
6k views

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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1answer
698 views

Increase bandwidth of Linksys WRT54GL (with Tomato inside)

I have Linksys WRT54GL with Tomato firmware installed. When I connect internet cable directly to a computer I can download at about 8 MB/s, however when internet is access through the router maximum ...
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3answers
769 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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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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3answers
1k views

Increasing Postfix Performance for Outbound Mail

We're trying to optimize a Dell PowerEdge 1850, Dual 3GHz procs, 3072MB RAM, running Postfix 2.8.4 and signing mail with OpenDKIM 2.4.1. iostat -x output is: avg-cpu: %user %nice %system %iowait ...
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211 views

Linux script to check settings and recommend tuning changes? [closed]

I'm searching for a script to run on our linux server and recommend various tuning changes we might consider making, as well as their suggested values for consideration. Any ideas if something like ...
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1answer
5k views

Interpreting ethtool Coalesce output

Other than tx and rx being the transmit and recieve, can anyone explain what the fields mean in ethtool -c's (Coalescing output) and what effect they have on how coalescing works? Coalesce parameters ...
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2answers
168 views

SQL performance, how to exactly measure bottlenecks

Yesterday me (programmer) and one of my coworkers from our Hosting department started series of tests to address performance issues with our websites. We are running a server with Windows Server 2008 ...
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2answers
102 views

what to check for limitations if a linux machine maxes out at a certain connection/s

I have a linux machine with a dummy HTTP server on it. It accepts a certain number of connections/second. Neither the CPU (it is a multicore) nor the memory nor IO are exhausted. What else can be ...
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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
722 views

IIS6 - Classic ASP - “out of memory”/“out of string space”

We have a classic ASP application that's under significantly more load than usual. We are from time to time been getting "out of memory" and "out of string space" in the httperr. We do not usually ...
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2answers
143 views

Does deleting unused files such as images, javascript, xml, html, asp etc make your Windows Server faster?

I have an IIS7 Windows 2003 Dedicated server. I just wanted to know if I delete old files such as XML, HTML, ASP, PHP, images, CSS, JavaScript.. etc.. files that are no longer used.. Does this ...
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2answers
647 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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2answers
5k 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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2answers
1k views

How to adjust MySQL performance

I'm facing a real problem with MySQL instance for a service online. We use hibernate and c3p0 pool with these settings: c3p0.max_size=200 c3p0.min_size=5 c3p0.timeout=60000 c3p0.max_statements=20 ...
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1answer
476 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
530 views

PostgreSQL tuning recommendation for large server and dataset

I'm working with a PostgreSQL (8.1) server on a dedicated machine with 64 GB of RAM and a fast RAID disk. The data set itself is pretty huge -- we have several tables around 200 GB, more in the 50-100 ...
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2answers
139 views

How to connect an Oracle server between two countries and maintain high speeds for read & write

Our company has two branches, one in Malaysia and the other one in India. The problems occur when we try to share one of our Oracle environments to our branch in India; the connection is very slow, ...
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2answers
450 views

Troubling AB benchmarking result?

I'm a real noob when it comes to sys admin. I'm running an app on an EC2 MicroInstance. Before I launch publicly, I want to make sure that I hit a minimum level of performance. I'm trying out some ...
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4answers
327 views

Trying to scale my dedicated server for high traffic

I have a quad core xeon, 8GB ram, and only 2 x 1TB SATA drives right now. I am trying to figure out how to scale my application to handle as much load and traffic per day as possible. I have an ...
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2answers
645 views

Establish a performance baseline for terminal server windows machines

I need to establish a performace basline for our Terminal Server machines. i plan to use perfmon , and will have a SCOM server on the site very soon. The terminals are used as a desktop environment ...
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7answers
8k views

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
705 views

MySQL hosting: What are the recommended specs and w

I have two specific cases of MySQL hosting. 1) I have a case where I have 2000 plus concurrent users to a single MySQL Database. They are not simple web users, but actual business users who need to ...
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1answer
292 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 ...
3
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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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5answers
366 views

Figuring out what's causing a server to slow down

I have a potential client that has a php site that performs fine most of the time. However, every week or so, it will experience lag (slow page loading). I am sure there are a myriad of things that ...
2
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1answer
276 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
2k views

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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5answers
405 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
568 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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438 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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5answers
1k views

What could be causing memory creep on a VPS?

I've got a VPS package. I cannot log into my lxadmin because it is "out of memory". In HyperVM I see that my VPS is using 240 MB of 256 MB. When I reboot the HyperVM, the memory goes down to 2 MB. ...
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2answers
451 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 ...