Measuring how long it takes to create, attach, detach and
destroy a shared memory region (buffersize = how big is region in bytes)

Result for buffersize 1024 (average over 10000 operations):
number of operations per second: 2907.33
clock secs:0.000343958(=343.958 usecs)  cpu secs:0.000344(=344 usecs)

Result for buffersize 2048 (average over 10000 operations):
number of operations per second: 2901.89
clock secs:0.000344603(=344.603 usecs)  cpu secs:0.000344(=344 usecs)

Result for buffersize 4096 (average over 10000 operations):
number of operations per second: 2910.82
clock secs:0.000343545(=343.545 usecs)  cpu secs:0.000344(=344 usecs)

Result for buffersize 8192 (average over 10000 operations):
number of operations per second: 2909.01
clock secs:0.000343759(=343.759 usecs)  cpu secs:0.000344(=344 usecs)

Result for buffersize 16384 (average over 10000 operations):
number of operations per second: 2902.14
clock secs:0.000344574(=344.574 usecs)  cpu secs:0.000344(=344 usecs)

Result for buffersize 32768 (average over 10000 operations):
number of operations per second: 2911.73
clock secs:0.000343438(=343.438 usecs)  cpu secs:0.000344(=344 usecs)

Result for buffersize 65536 (average over 10000 operations):
number of operations per second: 2909.55
clock secs:0.000343695(=343.695 usecs)  cpu secs:0.000343(=343 usecs)

Result for buffersize 131072 (average over 10000 operations):
number of operations per second: 2877.81
clock secs:0.000347487(=347.487 usecs)  cpu secs:0.000346(=346 usecs)

Result for buffersize 262144 (average over 10000 operations):
number of operations per second: 2892.07
clock secs:0.000345773(=345.773 usecs)  cpu secs:0.000346(=346 usecs)

Result for buffersize 524288 (average over 10000 operations):
number of operations per second: 2894.22
clock secs:0.000345516(=345.516 usecs)  cpu secs:0.000345(=345 usecs)

Result for buffersize 1048576 (average over 10000 operations):
number of operations per second: 2870.85
clock secs:0.000348329(=348.329 usecs)  cpu secs:0.000348(=348 usecs)