[petsc-users] same code, different machine, different performance

[Jed Brown]

张国熙 <altriaex86 at gmail.com> writes:

> Hi,all
>
> Recently I am using SLEPc to solve an sparse eigenvalue problem. I use
> krylov-shur and mumps as solvers.
>
> My codes work well my corei5 dual core laptop. Compared to my old
> sequential solution ARPACK/UMFPACK, running with 2 process could give me
> 1.3x speedup. However when I install my code on another station with quad
> core CPU, the performance change significantly. My parallel code runs 2-3
> times slower than sequential code.

Run "make streams NPMAX=4" and send the output.
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