Re: Parallel Kit Question: ParallelDot is much more slow than Dot
- To: mathgroup at smc.vnet.net
- Subject: [mg40429] Re: Parallel Kit Question: ParallelDot is much more slow than Dot
- From: nafod40 <may106 at SPAMAWAY.psu.edu>
- Date: Sat, 5 Apr 2003 03:58:10 -0500 (EST)
- Organization: Penn State University, Center for Academic Computing
- References: <b6gn64$ckk$1@smc.vnet.net> <b6j8ev$5vc$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Jens-Peer Kuska wrote: > Hi, > > parallel commands are usualy slower than serial ones, > because you have the overhead for process communication. Have you used the Parallel Toolkit? My experience shows there are some gross inefficiencies in their implementation of the ParallelMap[ ] functions. In general, the toolkit is useful if you can decompose your problem coarsely. Don't use the ParallelMap[ ] function or similar, develop yuor own analogs based on RemoteEvaluate[ ].