Goal: check if we have similar issues with caching as found in psana1. 

Below shows perf events used in profiling:

Perf command 
perf stat -e cache-references,cache-misses,cycles,instructions,branches,branch-misses,faults,migrations,page-faults,L1-dcache-load-misses,L1-icache-load-misses mpirun -n N_cores python test.py

Explanation of perf events (perf list):

eventdescription
cache-references[Hardware event]
cache-misses
cycles
instructions
branch-misses
faults
migrations
page-faults
L1-dcache-load-misses
L1-icache-load-misses
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