Dear all
I am trying out Chapel with some simple example to see how it fares with
MPI.
I solve a linear advection equation in 2-d using Chapel and Petsc with a
finite volume method. The Petsc code makes use of Petsc vectors to handle
the MPI communication. I dont really solve any matrix problem.
I have these two codes here
https://github.com/cpraveen/cfdlab/tree/master/chapel/convect2d
https://github.com/cpraveen/cfdlab/tree/master/petsc/convect2d
Both codes are solving the same problem with same algorithm. I run these
codes on my 4-core macbook pro laptop as follows.
*Chapel 1.4*
time ./convect2d --n=100 --Tf=10.0 --cfl=0.4 --si=100000
3532 9.99
3533 9.99283
3534 9.99566
3535 9.99849
3536 10.0
real 0m4.451s
user 0m15.767s
sys 0m0.599s
*Petsc 2.7.3 (MPI)*
time mpirun -np 4 ./convect -Tf 10.0 -da_grid_x 100 -da_grid_y 100 -cfl 0.4
-si 100000
it, t = 3532, 9.990005
it, t = 3533, 9.992833
it, t = 3534, 9.995661
it, t = 3535, 9.998490
it, t = 3536, 10.000000
real 0m1.677s
user 0m6.370s
sys 0m0.242s
The Petsc (MPI) code is about 2.5 times faster than Chapel.
I would like to know if I am making comparison in a fair manner ? Am I
using the best optimization flags ? These are present in the makefiles.
With MPI, I used 4 processors but I did not specify anything with Chapel.
Is this a fair way to compare them ? If not what should be done ?
Thanks
praveen
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