[petsc-users] MPI speedup

[siddhesh godbole]

Hello,

I want to know about the test which is conducted just after the PETSC is
configured on the system to assess the possible speedup by MPI processes. I
have saved the result file which says:
*Number of MPI processes 10*
*Process 0 iitm*
*Process 1 iitm*
*Process 2 iitm*
*Process 3 iitm*
*Process 4 iitm*
*Process 5 iitm*
*Process 6 iitm*
*Process 7 iitm*
*Process 8 iitm*
*Process 9 iitm*
*Function      Rate (MB/s) *
*Copy:       24186.8271*
*Scale:      23914.0401*
*Add:        27271.7149*
*Triad:      27787.1630*
*------------------------------------------------*
*np  speedup*
*1 1.0*
*2 1.75*
*3 1.86*
*4 1.84*
*5 1.85*
*6 1.83*
*7 1.76*
*8 1.79*
*9 1.8*
*10 1.8*
*Estimation of possible speedup of MPI programs based on Streams benchmark.*

1) What parameters the speedup depends on?
2) what are the hardware requirements for higher speedup? ( i was expecting
atleast 5 times speedup after generating 10 processes.
3) what could possibly be done to improve this ?

i have intel® Core™ i7-4930K CPU @ 3.40GHz × 12 with 32 GB of RAM and 1 TB
disk space.


Thanks
*Siddhesh M Godbole*

5th year Dual Degree,
Civil Eng & Applied Mech.
IIT Madras
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