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From: vulture@imperial.ac.uk (Thomas Sippel - Dau)
Subject: Re: Problem to transfer large data via socket communication - Need Help
Message-ID: <1993Jan11.133545.16876@cc.ic.ac.uk>
Sender: vulture@carrion.cc.ic.ac.uk (Thomas Sippel - Dau)
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Reply-To: cmaae47@imperial.ac.uk
Organization: Imperial College of Science, Technology and Medicine
References: <1993Jan8.071612.13716@news.uni-stuttgart.de>
Date: Mon, 11 Jan 93 13:35:45 GMT
Lines: 32
In article <1993Jan8.071612.13716@news.uni-stuttgart.de>, wnkretz@ikesg1.energietechnik.uni-stuttgart.de (Oliver Kretzschmar) writes:
......
- to send data from socket to socket (stream):
-
- write(socket,(char*)data,buffer)
- read(socket,(char*)data,buffer)
-
- But now we've problems sending/receiving large data for
- example 50*50*50 matrix of floats or larger. Is there any
- transfer-bufferlimitation by using streamsockets, that we can
- manipulate ?
Yes, there is a number of streams buffers configured in the kernel, see
(on IRIX) /usr/sysgen/master.d/kernel.
However, you main error is to use read/write, which is for "unbuffered"
I/O and has generally been designed to be fast and for people who know
what they are doing and are willing to cope with hardware limitations
themselves.
For applications programers the latter is not generally true, so use
fread/fwrite and swallow the extra layer of software for the benefit
of generality.
Thomas
--
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* email: cmaae47 @ ic.ac.uk (Thomas Sippel - Dau) (uk.ac.ic on Janet)
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