Newsgroups: comp.parallel.pvm
From: Ingo Reise <reise>
Subject: Re: The construction of the packet used in PVM
Organization: University of Wuerzburg, Germany
Date: 7 Jul 1995 11:40:20 GMT
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0044mura@ec.t.kanazawa-u.ac.jp (MURAKAMI yoshimichi) wrote:
>	I am now examining the packet used in PVM.
>Especially, I would like to find out how many data can be 
>sent in one transmission.
>In addition to above, which directories(files) controle
>these processes?
>
>	I am using the SunOS-4 and Ethernet(10-Base T:10Mbps).
>I am looking forward to someone's reply.
>
>		Yoshimichi Murakami
>		Kanazawa University, Japan
>		e-mail: murakami@totoro.ec.t.kanazawa-u.ac.jp
Hi!

Perhaps this part of $PVM_ROOT/Readme.mp could help you:

        2. The buffer size used by PVM, SHMBUFSIZE, is defined in
pvm3/src/pvmshmem.h, with a default of 1MBytes. Your message must fit
in the buffer. If your program uses large messages, this parameter MUST
be increased accordingly. Note that the default system limit on shared-
memory segment size (1 MB on Sun's) may have to be raised as well.
A large number of small messages can also fill up the buffer if they
are not received in time, and the performance degrades considerably
when this happens.

        3. You can change the buffer size by setting the environment
variable PVMBUFSIZE before starting PVM. This would have the same
effect as changing SHMBUFSIZE and recompiling PVM.

Greetings,
Ingo
-- 


                     __o           
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___________________()/ ()______________________________________________________
Ingo Reise                                      
Robert-Kirchhoff-Strasse 55    Lehrstuhl fuer Informatik II
97076 Wuerzburg                Universitaet Wuerzburg
Tel. 0931/273597               e-mail: reise@informatik.uni-wuerzburg.de


