Performance FAQ: Difference between revisions
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==FAQ== | ==FAQ== | ||
===How do you define "concurrent users"?=== | ===How do you define "concurrent users"?=== | ||
As has been repeatedly stressed in the forum, the load on the server depends primarily on the number of concurrent users, not on the total number of users neither the number of users logged-in at a given time. In this context, the concurrent users are those for whom the server actively doing something [1]. It may by processing a webpage written in PHP, processing a database querry or simply transfering a file. | As has been repeatedly stressed in the forum [0], the load on the server depends primarily on the number of concurrent users, not on the total number of users neither the number of users logged-in at a given time. In this context, the concurrent users are those for whom the server actively doing something [1]. It may by processing a webpage written in PHP, processing a database querry or simply transfering a file. | ||
[0] Using Moodle [http://moodle.org/mod/forum/view.php?f=94 Hardware and Performance forum] | |||
[1] http://en.wikipedia.org/wiki/Concurrency_(computer_science) | [1] http://en.wikipedia.org/wiki/Concurrency_(computer_science) | ||
Revision as of 06:29, 7 October 2009
FAQ
How do you define "concurrent users"?
As has been repeatedly stressed in the forum [0], the load on the server depends primarily on the number of concurrent users, not on the total number of users neither the number of users logged-in at a given time. In this context, the concurrent users are those for whom the server actively doing something [1]. It may by processing a webpage written in PHP, processing a database querry or simply transfering a file.
[0] Using Moodle Hardware and Performance forum
[1] http://en.wikipedia.org/wiki/Concurrency_(computer_science)
How do I benchmark a Moodle-site?
You can ofcourse benchmark each component of the software stack, staring from the operating system upto the database. But there is no easy formula to deduct the maximum number of concurrent users from those data.
There is a PHP-script [2] circulating amoung the community which gives you a ballpark figure. Take the current version from 1. March 2007 posted here [3]. Please note running this script on a production server may have side-effects, you are strongly adviced to run it on a test-site.
[2] http://moodle.org/mod/forum/discuss.php?d=57028
[3] http://moodle.org/mod/forum/discuss.php?d=57028#p296907
What are PHP-accelerators?
For the definition see Wikipedia [4]. Read the Performance documentation [5] for possible software.
[4] http://en.wikipedia.org/wiki/PHP_accelerator
[5] https://docs.moodle.org/en/Performance#PHP_performance
