The Co-Design of Exascale Storage Architectures (CODES) simulation framework builds upon the ROSS parallel discrete event simulation engine to provide high-performance simulation utilities and models for building scalable distributed systems simulations
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Tiny fix that shows up only when running an experiment with the `-O3` compilation flag #238
This tiny fix should be merged into "master". It does not alter the behavior of CODES. It is a fix to a bug that appeared.
The bug in question is:
Improper use of variable declaration inside a scope provokes segfault on optimized code -O3
A variable was declared and defined under a scope that was disregarded. Later on, outside of the scope a reference to the variable was used again causing a segfault.
This expression was never executed (optimized out):
oc_params.nprocs = num_traces_of_job[lid.job];
because oc_params.nprocs was never used within the scope of oc_params.
Later on, a pointer to oc_params tries to access nprocs but this contains only garbage, and this triggers a segfault down the line.
This tiny fix should be merged into "master". It does not alter the behavior of CODES. It is a fix to a bug that appeared.
The bug in question is:
Improper use of variable declaration inside a scope provokes segfault on optimized code
-O3A variable was declared and defined under a scope that was disregarded. Later on, outside of the scope a reference to the variable was used again causing a segfault.
This expression was never executed (optimized out):
because
oc_params.nprocswas never used within the scope ofoc_params.Later on, a pointer to
oc_paramstries to accessnprocsbut this contains only garbage, and this triggers a segfault down the line.