I am looking for a script to test the responsiveness of my Moodle installation for various numbers of concurrent connections. Basically, I would like to get am idea how many concurrent connections are possible w/o crashing or stalling the system.
I have no time right now to right it by myself, and searched a bit but could not find anything. Please, let me know if you know of something that is likely to do the job. Thank you.
Atanas
Try Apache JMeter. It can perform concurrency tests as detailed in this part of the user manual (http://jakarta.apache.org/jmeter/usermanual/build-web-test-plan.html). The results are best viewed on a graph visualiser.
By default php is set to timeout after 60s, so we increase the number of users until we hit this figure for the average response line on the graph for the index.php page. At this point we have a very good estimate of the absolute capacity of the system in terms of concurrent users logging-in (but most users would have closed down their broswer by then, so we look for 30s as a good guide 
). You can also simulate user browsing (use the Gaussian Random timer) to get a more realistic view of system loading.
Ken
If you are stress testing _from_ a windows machine, look for WAST. It is quite good and easy to use.
Regards... Tom
