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 stalled-cycles-backend,stalled-cycles-frontend,ls_l1_d_tlb_miss.all,l1_dtlb_misses,l1_data_cache_fills_all,bp_l1_tlb_miss_l2_tlb_miss.if2m,bp_l1_tlb_miss_l2_tlb_miss,l2_dtlb_misses,l2_itlb_misses mpirun -n 120 python preproc_v4_no_srv.py 569

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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