From: bslee Newsgroups: comp.parallel.pvm Subject: Re: slower cluster Date: Fri, 02 Jul 1999 19:04:41 +0900 Organization: Dept. of Aerospace Eng. Seoul National Univ. / ETRI Supercomputer Center Sender: bslee6@150.183.121.16 Message-Id: <377C8EB8.C52DDAF1@pvmcube4.snu.ac.kr> References: <377C695A.804EE5F8@worldonline.fr> Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="------------162ED51A8C6FAE24687C10CF" Xref: ukc comp.parallel.pvm:8537 --------------162ED51A8C6FAE24687C10CF Content-Type: text/plain; charset=EUC-KR Content-Transfer-Encoding: 7bit Yann GUILLOU wrote: > HI > I installed Three Pentium 133/32Mb/1.7Go computers in a beowulf cluster > with PVM 3.4.1. I compiled POV 3.1e.1 with the pvmpov patch. Until > there, everything ran quite well. > BUT .... > Rendering SHAPES.POV without PVM (-N) : rendering time is 4 mn 29 s. > Rendering the same with the three computers : rendering time is 5 mn 47 > s. > PVM seems to work correctly, I can add all the computers wiithout any > problem.RSH functions correctly too. > I use NE2000 10Bt compatibles NICs. No DNS, no gateway. > In fact, I just followed the Pondermatic howto found at > www.cris.com/~rjbono/html/pondermatic.html > If someone can help, I'd like to understand. > Thanks. > > PS : sorry, my english is maybe not as good as I would like it to be. If you are using the same architectures, modify the source code to enhance the communication performances. In the pvm_initsend, use PvmDataRaw instead of PvmDataDefault. There is no need to use XDR encoding because you use the same arch. In addition to the above, set the below option. call pvmfsetopt(PvmRoute,PvmRouteDirect,ioldval) It doesn't use pvmd at communication between two processes. you can find more hints about the ehnancement of the PVM performance in the PVM home pages. My E -- Lee, Bo-sung Ph.D. Candidate Dept. of Aerospace Eng. Seoul National Univ. Invited Researcher ETRI Super Computer Center phone : 82-2-880-8051(SNU) 82-42-869-0579(ETRI) 016-460-0821 mailto:bslee@pvmcube4.snu.ac.kr mailto:bslee@bslee.hpcnet.ne.kr --------------162ED51A8C6FAE24687C10CF Content-Type: text/html; charset=EUC-KR Content-Transfer-Encoding: 7bit Yann GUILLOU wrote:
HI
I installed Three Pentium 133/32Mb/1.7Go computers in a beowulf cluster
with PVM 3.4.1. I compiled POV 3.1e.1 with the pvmpov patch. Until
there, everything ran quite well.
BUT ....
Rendering SHAPES.POV without PVM (-N) : rendering time is 4 mn 29 s.
Rendering the same with the three computers : rendering time is 5 mn 47
s.
PVM seems to work correctly, I can add all the computers wiithout any
problem.RSH functions correctly too.
I use NE2000 10Bt compatibles NICs. No DNS, no gateway.
In fact, I just followed the Pondermatic howto found at
www.cris.com/~rjbono/html/pondermatic.html
If someone can help, I'd like to understand.
Thanks.

PS : sorry, my english is maybe not as good as I would like it to be.

If you are using the same architectures, modify the source code to enhance the communication
performances. In the pvm_initsend, use PvmDataRaw instead of PvmDataDefault. There is no need
to use XDR encoding because you use the same arch. In addition to the above, set the below option.

call pvmfsetopt(PvmRoute,PvmRouteDirect,ioldval)

It doesn't use pvmd at communication between two processes. you can find more hints about the ehnancement of the PVM performance in the PVM home pages.

My
E 

-- 
Lee, Bo-sung
Ph.D. Candidate Dept. of Aerospace Eng. Seoul National Univ.
Invited Researcher ETRI Super Computer Center
phone : 82-2-880-8051(SNU) 82-42-869-0579(ETRI)
        016-460-0821
mailto:bslee@pvmcube4.snu.ac.kr
mailto:bslee@bslee.hpcnet.ne.kr
  --------------162ED51A8C6FAE24687C10CF--