Re: [OpenSTA-users] OpenSTA making n number of connections

[Daniel S. <da...@Op...>]

Bernie Velivis wrote:
> You may also need to look at manually inserting synchronize
> commands to make OpenSTA playback more realistic.

I think this statement needs a little explanation.  Inserting
SYNCHRONIZE commands after the primary GET can make replay more
realistic as load increases because it allows the script to
react to the extended wait and load times of this GET before
starting its secondary GETs.  However, doing this means that
your script will no longer start downloading the secondary items in
a page until the whole of the primary (HTML) is downloaded - and 
this is *not* how a browser behaves.

The default recorded scripts do not react to extended download times
and therefore as load increases the secondaries may end up being
requested before the primary download has even got to the point
where it should know about the secondary - this is definitely
unrealistic and why using the SYNCHRONIZEs is seen as "more"
realistic.

Bernie knows the above and understands the comprimises involved -
you should also attempt to do this before you make your script do
something which isn't really what you want. ;)

As far as diagnosing your "extra" DB connections - I would be
looking at tracing what your Web app is doing under load ... after
all, it is this that is making the DB connections and not OpenSTA.

Cheers
/dan
-- 
Daniel Sutcliffe <Da...@Op...>
  OpenSTA part-time caretaker - http://OpenSTA.org/