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Message-ID: <39E7A3C0.A50DD6F2@SunyataSystems.Com>
Date: Fri, 13 Oct 2000 20:07:28 -0400
From: "Laurence F. Wood" <LaurenceWood AT SunyataSystems DOT Com>
Organization: Sunyata Systems Corporation
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To: Chris Abbey <cabbey AT chartermi DOT net>
CC: cygwin AT sourceware DOT cygnus DOT com
Subject: Re: Cygwin Performance Info
References: <4 DOT 3 DOT 2 DOT 7 DOT 0 DOT 20001013184237 DOT 00b6cd70 AT pop DOT bresnanlink DOT net>
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From your response it sounds like if I have a compute bound application, i.e.
one that does not make system calls, there is no hit.  However, what about
memory allocation and deallocation?

Chris Abbey wrote:

> At 19:23 10/13/00 -0400, Laurence F. Wood wrote:
> >Can someone tell me where the performance hit is in cygwin unix
> >emulation?
>
> whichever part you use the most inside your tightest inner loop.
>
> seriously.
>
> that's a big huge open ended question (not about cygwin, about ANY
> library/platform) that is as specific to your application as you can
> get. For example, if you spend 75% of your computing day manipulating
> text files and piping them and greping them and running file utils
> against them then the cr/lf translation may be a big hit for you.
> On the otherhand if most of your computation in a day is spent answering
> requests that come in on tcp/ip sockets then the remapping of winsock
> to netinet.h functions maybe your major headache. (note, I'm not trying
> to imply that either function has a performance problem, merely that they
> would be representative places that would have high invocation counts
> in the course of the given activity.)
>
> To really answer that for your application/workload then you need to
> get some form of performance detailing that can tell you how much time
> you are spending in any given method and how often it's called.
>
> --
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