From: Mark Geisert <mark@maxrnd.com>
To: cygwin@cygwin.com
Subject: Re: Cygwin multithreading performance
Date: Mon, 23 Nov 2015 07:45:00 -0000 [thread overview]
Message-ID: <5652C402.7040006@maxrnd.com> (raw)
In-Reply-To: <20151121105301.GE2755@calimero.vinschen.de>
Corinna Vinschen wrote:
> On Nov 21 01:21, Mark Geisert wrote:
[...] so I wonder if there's
>> some unintentional serialization going on somewhere, but I don't know yet
>> how I could verify that theory.
>
> If I'm allowed to make an educated guess, the big serializer in Cygwin
> are probably the calls to malloc, calloc, realloc, free. We desperately
> need a new malloc implementation better suited to multi-threading.
That's very helpful to know. I'd want to first make sure the heavy lock
activity I'm seeing in the traces really is due to malloc() and friends
but I couldn't help a speculative search online for multithread-safe
malloc(). These turned up:
tcmalloc - part of google-perftools, requires libunwind, evidently
not yet ported to Windows AFAICT,
nedmalloc - http://www.nedprod.com/programs/portable/nedmalloc/
ptmalloc - http://www.malloc.de/
The latter two are based on Doug Lea's dlmalloc which is also the basis
of Cygwin's malloc() functions. As I understand it, ptmalloc in one
form or another has been part of glibc on Linux for some time.
So there may be a solution in sight if we need to go that direction. Of
course, SHTDI as usual :).
..mark
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next prev parent reply other threads:[~2015-11-23 7:45 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-14 0:24 Kacper Michajlow
2015-11-19 20:24 ` Mark Geisert
2015-11-20 14:25 ` Kacper Michajlow
2015-11-21 9:21 ` Mark Geisert
2015-11-21 10:53 ` Corinna Vinschen
2015-11-23 7:45 ` Mark Geisert [this message]
2015-11-23 10:27 ` John Hein
2015-11-24 1:05 ` Mark Geisert
2015-11-26 9:49 ` Corinna Vinschen
2015-11-26 10:49 ` Mark Geisert
2015-12-05 10:51 ` Mark Geisert
2015-12-05 13:07 ` Kacper Michajlow
2015-12-05 13:59 ` Kacper Michajlow
2015-12-05 22:40 ` Mark Geisert
2015-12-06 2:35 ` Kacper Michajlow
2015-12-06 8:02 ` Mark Geisert
2015-12-06 20:56 ` Kacper Michajlow
2015-12-08 10:51 ` Mark Geisert
2015-12-08 15:34 ` Corinna Vinschen
2015-12-08 17:02 ` Corinna Vinschen
2015-12-18 15:06 ` Achim Gratz
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