Pin is a shared object which can intercept a target program calls to pthread and sched functions in order to control how the threads of this target are pinned.
Once pin.so is built, you can modify the pinning behavior of a program foo
by doing : export LD_PRELOAD=pin.so ; ./foo
These instructions load the pin.so object, but you also need to inform pin.so
of what to do.
Here are some examples :
export PIN_RR="0 3 12-17,23" ; export LD_PRELOAD=pin.so ; ./foo
This tells pin.so to pin the new threads in a round-robin fashion on cores 0, then 3, then one of 12 to 17 or 23.
export PIN_MAP="0=12 3=17 5=17" ; export LD_PRELOAD=pin.so ; ./foo
This tells pin.so to intercept sched_setaffinity() calls to pin threads to
core 12 instead of core 0, and to core 17 instead of core 3 or 5.