[Webdev] [Fwd: Benchmarks + testing (was Re: Phour-Oh-One)]

[Donncha O Caoimh]

$ more test.sh
for i in `perl -e 'for (1..200) {print "$_\n"}'`
 do
 echo
 echo TEST: $i
 wget -O o.txt "http://URL" &
 sleep 1
 done

Sends 200 requests at the server with a 1 second delay between each.. I
don't care about output.
Then on the server I do
while(true)
do
mysqladmin -u root -p <password> ext
uptime
ps -ef |grep -c apache
sleep 10
done

which gives quite an accurate view of the system load.. this of course
is dependant on using Apache and MySQL.
The ps -ef bit should be optional as that's quite stressful on an
already stressed server.
There's also Apache Bench, found in either /usr/sbin/ab or
/usr/local/apache/bin/ab

There's also a service run by http://www.envive.com/ which is very
impressive but I presume costs quite a bit. They can emulate any number
of users coming from the USA (and soon the UK) over different bandwidth
links requesting different pages/series of pages. While the test goes on
you can monitor it from the user side through a Java applet and nice
graphs. The amount of information available is quite amazing, and I need
to set aside some time to go over our own results..
There was also quite a bit of discussion about this on the
performance-linux mailing list but that seems to have died down again.

Donncha.

> 
> Aha, testing. Anyone want to recommend some good (preferably with source
> available) tools for stress testing webservers with xy + z technology
> behind them (ie ejb's layer, database layer etc). Fault injections to
> see how the backend code works would be nice as well.
>