parallel vs single

hedley · June 20, 2014, 12:14

Finally got parallel to run BUT where solving on the turb_ONERA6.cfg if I run on single core it runs TWICE as fast as on a four core ??

When running four core it seems to do the same job over on each core + all of the MPI overhead.

454514566@qq.com · June 20, 2014, 12:30

Do you can run parallel in win7?
If yes,you can tell me how to install the su2 v3.2 in win7,thank you greatly.

hedley · June 20, 2014, 12:33

No I gave up on that . To get it to run on Linux was more a matter of setting up the PATH's to the MPI /bin file . I still think although it runs it is not doing it properly as it is way slower than on one core. The Linux attempt is just a sanity test and once done will try and get windows working

Doriris · June 23, 2014, 06:19

It seems that each calculation is carried out 4 times on 4 cores, rather than 1 time on 4 cores. This is due to a faulty mpicxx setup. View this thread for more info:

http://www.cfd-online.com/Forums/su2...t-4-times.html

The same issue arised on my machine, I simply had to check if the link towards mpicxx was set correctly.

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June 20, 2014, 12:30		#2
454514566@qq.com New Member XingYu Join Date: May 2014 Posts: 25 Rep Power: 12	Do you can run parallel in win7? If yes,you can tell me how to install the su2 v3.2 in win7,thank you greatly.

June 20, 2014, 12:33		#3
hedley Member Hedley Join Date: May 2014 Posts: 52 Rep Power: 12	No I gave up on that . To get it to run on Linux was more a matter of setting up the PATH's to the MPI /bin file . I still think although it runs it is not doing it properly as it is way slower than on one core. The Linux attempt is just a sanity test and once done will try and get windows working

June 23, 2014, 06:19		#4
Doriris New Member Jeffrey van Oostrom Join Date: Feb 2014 Location: Delft, The Netherlands Posts: 16 Rep Power: 12	It seems that each calculation is carried out 4 times on 4 cores, rather than 1 time on 4 cores. This is due to a faulty mpicxx setup. View this thread for more info: http://www.cfd-online.com/Forums/su2...t-4-times.html The same issue arised on my machine, I simply had to check if the link towards mpicxx was set correctly.