CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > General Forums > Main CFD Forum

speed up ratio at parallel processing

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 25, 2000, 07:44
Default speed up ratio at parallel processing
  #1
Kim hak-gyu
Guest
 
Posts: n/a
I'm studying about parallel processing at distributed computing network using some different kinds of computers like PC & workstation. However, I'm concerning about the speed up ratio equation suitable for that system. As far as I know, the old speed up ratio equation(Sp = T1 / Tp) can't give a correct ratio because it needs same computers to use that eqn. So, I'm wonder whether or not there's another equation for that system. Anybody who know about it, please tell me....
  Reply With Quote

Old   October 25, 2000, 10:57
Default Re: speed up ratio at parallel processing
  #2
boling
Guest
 
Posts: n/a
Yes, You are right. I met the same qustion when I did parallel computation by using PC clusters. According to original formula, we can assume that a1 represent the serial part which can not be parallized and if we neglect the communication time,

the maximum speedup ratio = 1/(a1+(1-a1)/n) , where n represent the process number .

If a1 = 0.1 , then the speedup ratio < 10 , so this formula is not rigorous , I saw another formula and I am looking for it .
  Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
multiphase solver - parallel processing - GAMG thibault_pringuey OpenFOAM Programming & Development 2 August 27, 2013 23:03
pressure eq. "converges" after few time steps maddalena OpenFOAM Running, Solving & CFD 69 July 21, 2011 08:42
HP MPI warning...Distributed parallel processing Peter CFX 10 May 14, 2011 07:17
Hardware Recommendation for Parallel Processing Brian Bian CFX 2 February 7, 2006 18:27
About parallel processing in Linux tuks CFX 10 August 8, 2005 09:22


All times are GMT -4. The time now is 17:22.