About Parallel Computing
- To: mathgroup at smc.vnet.net
- Subject: [mg25829] About Parallel Computing
- From: Makoto Nikaidoh <nikaidoh at mech.fukui-u.ac.jp>
- Date: Sat, 28 Oct 2000 01:41:21 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Hello,
My name is Makoto Nikaidoh.
I am Japanese graduate student.
I want to Parallel Computing using Mathmatica Parallel Computingkit..
However, calculation time is determined by performance of the SlaveMachine.
Therefore I think that my Parallel Computing is failure.
Two PC is each machine A and machine B.
machine A(CPU:Pentium$B-6(B 433MHz, Memory:128MB)
machine B(CPU:Pentium$B-7(B 550MHz, Memory:128MB)
I use FrontEnd with machine A.
I executed next.
machine A:
Needs["Parallel`Parallel`"]
Needs["Parallel`VirtualShared`"]
Needs["Parallel`Commands`"]
(Setting of kernel is always local)
MS-DOS prompt on machine B:
math -mathlink -linkcreate -linkprotocol TCP
machine A:
ConnectSlave[nnnn at xxx. yyy. zzz. ww]
(nnnn:port, xxx. yyy. zzz. ww:IP address of machine B)
(I was not able to start up kernel of SlaveMachine automatically.)
machine A:
TableForm[RemoteEvaluate[{$ProcessorID, $MachineName, $SystemID,
$ProcessID, $Version}], TableHeadings -> {None, {"ID", "host", "OS",
"process", "Mathematica Version"}}]
The kernel on machine B was slave of machine A.
I compared evaluation time of Do[i, {i, 1000000000}] with the next case.
case1 machine A(local Kernel)->2282.76 seconds
case2 machine B(local Kernel)->1770.79 seconds
case3 Master:machine A, Slave:machine B->1765.53 seconds
case4 Master:machine B, Slave:machine A->2252.88 seconds
Performance of two PC is each as follows.
machine A(CPU:Pentium$B-6(B 433MHz, Memory:128MB)
machine B(CPU:Pentium$B-7(B 550MHz, Memory:128MB)
Therefore I think that calculation time is determined by performance of the SlaveMachine.
I tried next in addition to RemoteEvaluate.
j1=Queue[Do[i, {i, 1000000000}]]
Wait[j1]
The result was the same as RemoteEvaluate almost,
but processor use rate was different.
RemoteEvaluate:machine A, B->100%
$B!!(BQueue and Wait:machine A->about 10%, machine B->100%
Please teach a way of Parallel Computing.
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Makoto Nikaidoh nikaidoh at mech.fukui-u.ac.jp
Graduate Student, Department of Mechanical Engineering
Fukui University, 3-9-1 Bunkyo, Fukui, 910-8507, JAPAN
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