delorie.com/archives/browse.cgi | search |
X-Recipient: | archive-cygwin AT delorie DOT com |
DomainKey-Signature: | a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id |
:list-unsubscribe:list-subscribe:list-archive:list-post | |
:list-help:sender:subject:references:to:from:message-id:date | |
:mime-version:in-reply-to:content-type | |
:content-transfer-encoding; q=dns; s=default; b=cHhpYF+QPSjA0Hl2 | |
zjAgQCHv9OXTghmHiYcrraekOC6wd+1ISZp4oxpXauAuks6mwhmESMYwwfTdx9KF | |
q77lVpVb0sJjjlGf7z8EhigJlZPzQsNGvgZ6n85wkUmwiIFQLM46IMVC9uRGQ5VX | |
2en9YJPZQYgLUYZBYuIc0oAdopU= | |
DKIM-Signature: | v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id |
:list-unsubscribe:list-subscribe:list-archive:list-post | |
:list-help:sender:subject:references:to:from:message-id:date | |
:mime-version:in-reply-to:content-type | |
:content-transfer-encoding; s=default; bh=o2SFVW+M22UnF/EeA02YCX | |
XJZL4=; b=hGfddJ/DScHPdYuQBFE308LXMUpGrEnPTKRHtNlf2Nvo/OvKAmHQdP | |
WFR7RmWe1Tn6r1fCsEvZTtxqlV5FlCosY8W9wtKItzJs7PneRU0SSiL6cTpBSs8E | |
yiCOOwgXV//tO3iVKm0wXtpc/gzhr3ParjlWePcXFhjsZqrm5Z5Zg= | |
Mailing-List: | contact cygwin-help AT cygwin DOT com; run by ezmlm |
List-Id: | <cygwin.cygwin.com> |
List-Subscribe: | <mailto:cygwin-subscribe AT cygwin DOT com> |
List-Archive: | <http://sourceware.org/ml/cygwin/> |
List-Post: | <mailto:cygwin AT cygwin DOT com> |
List-Help: | <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs> |
Sender: | cygwin-owner AT cygwin DOT com |
Mail-Followup-To: | cygwin AT cygwin DOT com |
Delivered-To: | mailing list cygwin AT cygwin DOT com |
Authentication-Results: | sourceware.org; auth=none |
X-Virus-Found: | No |
X-Spam-SWARE-Status: | No, score=-0.1 required=5.0 tests=AWL,BAYES_50,KAM_LAZY_DOMAIN_SECURITY autolearn=no version=3.3.2 |
X-HELO: | m0.truegem.net |
Subject: | Re: Cygwin multithreading performance |
References: | <CABPLASTtRK4mNxh0M_AnZgjJQ15kWPx+L=U=VCU3Wwi7jV_57A AT mail DOT gmail DOT com> <564E3017 DOT 90205 AT maxrnd DOT com> <CABPLASTLrH_udLuu2F-m5P6dkENW1Z4YHEudp4NG0-FGLJgPMg AT mail DOT gmail DOT com> <5650379B DOT 4030405 AT maxrnd DOT com> <20151121105301 DOT GE2755 AT calimero DOT vinschen DOT de> |
To: | cygwin AT cygwin DOT com |
From: | Mark Geisert <mark AT maxrnd DOT com> |
Message-ID: | <5652C402.7040006@maxrnd.com> |
Date: | Sun, 22 Nov 2015 23:45:06 -0800 |
User-Agent: | Mozilla/5.0 (Windows NT 6.1; WOW64; rv:42.0) Gecko/20100101 Firefox/42.0 SeaMonkey/2.39 |
MIME-Version: | 1.0 |
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 -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
webmaster | delorie software privacy |
Copyright © 2019 by DJ Delorie | Updated Jul 2019 |