Re: [GD-General] profiling multi threaded applications

[brian s. <bri...@gm...>]

Andras, are all of your threads doing the same thing? Otherwise, a critical=
=20
section won't do anything for you. If only one thread tries to acquire the=
=20
object, it will (trivially) always get it.

Now, if you're thinking going to put this critical section at the top level=
=20
of your app and make all threads go through it, then you're back to=20
Christian's suggestion:

If possible, design your architecture so that your threads can work in a
lockstep mode, with one central mutex controlling which thread is running a=
t
any given moment. That way you can at least get a partial profile and
optimize each thread individually.

This type of design can also prove very useful to debug deadlocks.

--brian

On 7/20/05, Lewin, Gareth <gl...@ea...> wrote:
>=20
> That shouldn't be a problem, I assumed your START and END pairs can be
> nested.
>=20
> From MSDN:
>=20
> After a thread has ownership of a critical section, it can make
> additional calls to EnterCriticalSection or TryEnterCriticalSection
> without blocking its execution. This prevents a thread from deadlocking
> itself while waiting for a critical section that it already owns. The
> thread enters the critical section each time EnterCriticalSection and
> TryEnterCriticalSection succeed. A thread must call LeaveCriticalSection
> once for each time that it entered the critical section.
>=20
> > -----Original Message-----
> > From: gam...@li...
> > [mailto:gam...@li...] On
> > Behalf Of Andras Balogh
> > Sent: Wednesday, July 20, 2005 1:50 PM
> > To: gam...@li...
> > Subject: Re: [GD-General] profiling multi threaded applications
> >
> > Yeah, I have something similiar, except that it's
> > hierarchical, so START and END can be nested, in which case
> > it gets a bit trickier to use CriticalSections, but I think I
> > could give that a try!
> >
> > thx,
> >
> > Andras
> >
> > Lewin, Gareth wrote:
> > > You could have your START and END macros (I assume you use
> > something
> > > like that) include EnterCriticalSection and LeaveCriticalSection
> >
> >
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>=20
>=20
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