I considered Tsung myself but haven't tried it. If you intend to, I suggest you read this excellent tutorial on using Tsung for test-loading Postgresql.
While impressed I decided the procedure was too daunting and went with
JMeter :-) It too can run test from multiple clients and has built in
tables and graphs and you can save results as CSV or XML etc. In
particular I recommend adding the extenion "listener" (JMeter term for
anything that captures and portrays test results) called Statitical
Aggregate Report.
May the force be with you,
-- Shaul
May the force be with you,
-- Shaul
On Wed, Jun 3, 2009 at 12:29 PM, Dimitri Fontaine <dfontaine@xxxxxxxxxxxx> wrote:
"Kenneth Cox" <kenstir@xxxxxxxxx> writes:Last time I used it it was in the context of a web application and to
> On Tue, 02 Jun 2009 05:26:41 -0400, Dimitri Fontaine
> <dfontaine@xxxxxxxxxxxx> wrote:
>> I'd recommand having a look at tsung which will be able to replay a
>> typical application scenario with as many concurrent users as you want
>> to: http://archives.postgresql.org/pgsql-admin/2008-12/msg00032.php
>> http://tsung.erlang-projects.org/
>> http://pgfouine.projects.postgresql.org/tsung.html
>
> I am having a look at tsung and not getting very far yet. Have you had luck
> with it and do you really mean as many concurrent users as you want?
compare PostgreSQL against Informix after a migration. So I used the
HTTP protocol support of the injector.
Tsung is based on erlang and can be run from more than one node at any
time, last time I checked you could run 600 to 800 concurrent clients
from each node. Recent versions of erlang allow a much greater number
per node, one or two orders of magnitude greater, as I've been told by
Tsung's main developer.
Tsung can be setup as an http or postgresql proxy: in this mode it'll
> I was
> hoping to use it to simulate my current load while tuning and making
> improvements. So far tsung doesn't appear well suited to my needs. I use
> persistent connections; each tsung session uses a new connection. I have
> multiple applications that have very usage patterns (some web and largely
> idle, some non web and almost saturated); tsung has virtual users choosing
> a session based on a probability with think times. I know many programming
> languages; tsung (and its error messages) is in erlang.
prepare session files for you while you use your application as
usual. The thinktime it sees will then get randomized at run time to
better reflect real usage.
You can define several user arrival phases to see what happens when the
load raises then get back to normal traffic. Lots of options, really.
Tsung generates statistics and comes with tools to analyze them and
provide graphs organized into a web page, one of those tools allow to
draw graphs from different simulations onto the same chart, with the
same scaling, in order to easily compare results.
It seems to me tsung is a good tool for your use case.
Regards,
--
dim
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