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Message-ID: <003d01c0fe1c$1f7e3c80$0200a8c0@lifelesswks>
From: "Robert Collins" <robert DOT collins AT itdomain DOT com DOT au>
To: "Greg Smith" <gsmith AT nc DOT rr DOT com>,
        "Cygwin General MailList" <cygwin AT cygwin DOT com>
References: <3B37D1A6 DOT 39A2685 AT nc DOT rr DOT com> <03c701c0fdd7$82ddbde0$0200a8c0 AT lifelesswks> <3B37F19F DOT C9BCDA23 AT nc DOT rr DOT com>
Subject: Re: pthreads works, sorta
Date: Tue, 26 Jun 2001 18:43:49 +1000
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----- Original Message -----
From: "Greg Smith" <gsmith AT nc DOT rr DOT com>
To: "Cygwin General MailList" <cygwin AT cygwin DOT com>
Sent: Tuesday, June 26, 2001 12:21 PM
Subject: Re: pthreads works, sorta


> Robert Collins wrote:
> > >
> > > My (heavily threaded) application runs approximately 100x
> > > slower than under linux and proceeds to the point where the
> > > program thrashes because it is calling pthreads functions
> > > faster than the pthreads implementation can deliver (we're
> > > talking _mutex_lock/unlock and _cond_wait/signal here).
> >
> > Condition variables we can't do much about here, other than trying
to
> > get down to the metal and rewrite em without OS support. I'm not
keen to
> > try that, for what I hope are obvious reasons.
>
> True.
>

I've just reviewed my reading, and it doesn't look as though critical
sections are going to be _much_ faster.

--> Greg, do you know that your issue is thread syncronisation
performance, or performance of I/O or other posix calls in between ? You
program shouldn't crash unless it manages to deadlock or trigger a
race... certainly the pthread calls cannot happen except when your
threads are active and have got cpu :].

How many concurrent threads and mutexs and cond variables are we talking
here?

Rob


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