Steven T. Snyder Steven T. Snyder 2 2 gold badges 9 9 silver badges 19 19 bronze badges. ChrisJohnson, interesting discovery My understanding was that the MPM could not be changed by configuration, only by compilation. It seems the OP thought the same, since he commented on his question with "or more technically 'compiled to run as'".
I'll look into reproducing your answer and once I've confirmed it I'll revoke mine. I confirmed via the apache documentation at httpd. So the MPM can indeed be changed at load time under certain circumstances which might be the most common configuration these days.. Quinn Comendant Quinn Comendant 2 2 silver badges 16 16 bronze badges. The answer from Chris Johnson is right. Manu Manu 2 2 silver badges 7 7 bronze badges.
One way that I figure it out in Debian like distros, is by running: apachectl -V grep -i mpm. Hex Hex 1, 10 10 silver badges 17 17 bronze badges. Sign up or log in Sign up using Google.
Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Does ES6 make JavaScript frameworks obsolete? Podcast Do polyglots have an edge when it comes to mastering programming Featured on Meta. Now live: A fully responsive profile. Linked Related Hot Network Questions. Question feed. However, Worker is incompatible with non-thread safe libraries. Each process under Event also can contain multiple threads but, unlike Worker, each is capable of more than one task.
Apache has the lowest resource requirements when used with the Event MPM. Event, though, is supported only on servers running Apache 2. Under Apache 2. Nevertheless, on high-traffic Apache 2. Liquid Web recommends against running these MPMs. Since they are experimental, there are no guarantees that they will work as expected and we can neither support them nor guarantee that we will be able to fix them.
The addition of the Multi Process Modules to Apache have increased its power and flexibility. The MPMs allow users to change the core behavior.
This increases what a user can do with Apache without having to install additional software. Join our mailing list to receive news, tips, strategies, and inspiration you need to grow your business. Our Sales and Support teams are available 24 hours by phone or e-mail to assist.
Search Search. Introduction All versions of Apache 2. Prefork With the Prefork module installed, Apache is a non-threaded, pre-forking web server.
Event Each process under Event also can contain multiple threads but, unlike Worker, each is capable of more than one task. About the Author: Matt Aurand. While they are waiting they are occupying RAM that could be used to service other clients. If you turn off KeepAlive fewer apache processes will remain active. You should also disable KeepAlive if you have bursty traffic where a lot of concurrent users access your sites during a short time period.
KeepAlive will cause your RAM usage to skyrocket. Discussed in the next section, play a vital role in fine-tuning the KeepAlive directive. This setting limits the number of requests allowed per persistent connection when KeepAlive is on.
If it is set to 0 , unlimited requests will be allowed. The default value is It is recommended to not increase this value beyond for virtualized accounts like VPS accounts. On dedicated servers with ample of RAM it is possible for this value to be increased. Setting this to a high value may cause performance problems in heavily loaded servers. The higher the timeout, the more server processes will be kept occupied waiting on connections with idle clients.
The default value of 10 seconds is a good value for average server performance. This value should be kept low as the socket will be idle for extended periods otherwise. It is recommended that this value be lowered to 5 on servers under heavy load. Remember, you can view what Apache modules have been compiled by entering httpd -l. ExtendedStatus will produce several system calls for each request to gather statistics, which negatively impacts performance. When possible it is better to utilize ExtendedStatus for a set time period in order to benchmark, but then turn it back off.
You will rarely ever need HostnameLookups and when you do, you can look them up after the fact. If you have HostnameLookups off, avoid using hostname in configs as this will prevent you from having to wait for the DNS of the hostnames in your configs to resolve. You should use IP addresses instead.
Gzip your content before sending it off, which then the client will uncompress upon receipt. This will minimize the size of file transfers and will generally improve the user experience. To utilize your cache you must also be sure to setup appropriate Expires , Etag , and Cache-Control Headers i. Place your cache on a separate physical disk for fastest access without slowing down other processes. A Solid State Drive provides the fastest access times. This test parses the configuration files and either reports a Syntax Ok or it offers information about the particular syntax error.
The apache2buddy. Apache Bench ab is a load testing and benchmarking tool designed for Apache webserver installations although, it will work without issue on any HTTP server such as nginx. Running ApacheBench is similar to directing a denial-of-service attack towards your own server. This particular tool is not designed to be sympathetic to your infrastructure, and provides no ability to increase concurrency in measured intervals over a testing period. The only option when running a load test through ab is to flood your web server with an arbitrary number of simultaneous requests all in one instant.
A load testing utility to benchmark web server performance written in Go language. It supports more than 20, concurrent users. One of the most popular open source tools to measure web application performance. JMeter is a java based application. It not only supports webservers, but you can use it to benchmark the performance of PHP, Java.
Httpload can read multiple URLs from text files, or you can specify it in the command argument. Rootkit Hunter rkhunter is a Unix-based tool that scans for rootkits, backdoors and possible Toggle navigation.
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You will receive an e-mail to confirm your subscription. How to optimize Apache performance. Generally, after tuning Apache to handle larger loads, it can be highly beneficial to optimize MySQL to help improve its memory footprint and to allow for additional connections. Formula to determine the MaxRequestWorkers directive:.
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