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UCL-RITS / pi_examples

A lot of ways to run the same way of calculating pi. Some of them are dumb.
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Use SIMD in Julia serial example #10

Closed giordano closed 3 years ago

giordano commented 3 years ago

With this small change (put @simd in front of the for loop), on Myriad I can match the performance of the Fortran example compiled with ifort:

[cceamgi@login12 fortran_pi_dir]$ ./run.sh 
rm -f *.o pi
make -f Makefile.intel
make[1]: Entering directory `/lustre/home/cceamgi/repo/pi_examples/fortran_pi_dir'
ifort -O2 -xHost -o pi pi.f90
make[1]: Leaving directory `/lustre/home/cceamgi/repo/pi_examples/fortran_pi_dir'
Calculating PI using:
                        1000000000 slices
                                 1 process
Obtained value of PI: 3.1415926536
Time taken:                0.87264 seconds

[cceamgi@login12 julia_pi_dir]$ julia pi_serial.jl 
Calculating PI using:
  1000000000 slices
  1 worker(s)
Obtained value of PI: 3.1415926535898455
Time taken: 0.8804278373718262 seconds