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From: Pedro Inacio <pedro DOT inacio AT honeynet-pt DOT org>
Subject: Re: select() too slow
Date: Wed, 15 Mar 2006 19:07:05 +0000
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On 2006/03/14, at 22:43, Christopher Faylor wrote:

> On Tue, Mar 14, 2006 at 09:42:25PM +0000, Pedro Inacio wrote:
>
> I don't have any 100MB files sitting around but when I tried this on a
> 14MB file, I find that cygwin is about 2X slower, not an order of
> magnitude slower.  Taking away the pipe and using regular file  
> redirection
> makes things a little faster on cygwin.
>
> So, I can't explain why you are seeing such extreme slowdowns.  I  
> am using
> the equivalent of a snapshot in my tests, however.  Maybe that's the
> difference.
>
> cgf

I have created a 14MB file and the results were:

On Linux: 4 seconds
On Cygwin: 44 Seconds

The test were made on 3 different platforms, and the results the same.
Cygwin is not just 2X slower but 11X slower, each is too much.

Another thing, what have the pipe and the file redirection to do with  
the results?
That command is given always on a Unix box which is the client of the  
echo_server.
Is just the echo_server that runs on Cygwin or Linux. ;)

I think is clear that there is a performance issue in the select()  
function that deserves attention.

Thanks,


Pedro inacio

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