launchpad-dev team mailing list archive

[Gavin Panella <gavin.panella@xxxxxxxxxxxxx>]

On 12 August 2011 16:09, Julian Edwards <julian.edwards@xxxxxxxxxxxxx> wrote:
> Dear hackers
>
> I need to add storm statement tracing to one of the scripts we've developed
> for Derived Distros so I can see if there's a performance improvement to be
> made.  I figured it would be a simple case of adding these three lines to the
> script (as advised by Rob):
>
>    from canonical.launchpad.webapp.adapter import LaunchpadStatementTracer
>    from storm.tracer import install_tracer
>    install_tracer(LaunchpadStatementTracer())

This tracer is installed by the act of importing its module, so the
install_tracer() call is a no-op.

Next, you'll need to use set_request_started() before
LaunchpadStatementTracer will start recording, then you'll need to
trigger an oops before calling clear_request_started() at the end of
the interesting bit (or just letting the script end). At least, this
is how checkwatches does it... which may or may not be a good
recommendation ;)

See the WorkingBase class in lib/lp/bugs/scripts/checkwatches/base.py
for some convenience stuff that should be easy to borrow.

Gavin.