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: 3642.87
clock secs:0.000274508(=274.509 usecs)  cpu secs:0.000275(=275 usecs)

Result for buffersize 2048 (average over 10000 operations):
number of operations per second: 3642.59
clock secs:0.00027453(=274.53 usecs)  cpu secs:0.000274(=274 usecs)

Result for buffersize 4096 (average over 10000 operations):
number of operations per second: 3635.9
clock secs:0.000275035(=275.035 usecs)  cpu secs:0.000275(=275 usecs)

Result for buffersize 8192 (average over 10000 operations):
number of operations per second: 3639.6
clock secs:0.000274755(=274.755 usecs)  cpu secs:0.000275(=275 usecs)

Result for buffersize 16384 (average over 10000 operations):
number of operations per second: 3374.42
clock secs:0.000296347(=296.347 usecs)  cpu secs:0.000296(=296 usecs)

Result for buffersize 32768 (average over 10000 operations):
number of operations per second: 3337.7
clock secs:0.000299607(=299.607 usecs)  cpu secs:0.0003(=300 usecs)

Result for buffersize 65536 (average over 10000 operations):
number of operations per second: 3456.54
clock secs:0.000289307(=289.307 usecs)  cpu secs:0.000289(=289 usecs)

Result for buffersize 131072 (average over 10000 operations):
number of operations per second: 3320.12
clock secs:0.000301194(=301.194 usecs)  cpu secs:0.000301(=301 usecs)

Result for buffersize 262144 (average over 10000 operations):
number of operations per second: 3285.33
clock secs:0.000304383(=304.383 usecs)  cpu secs:0.000305(=305 usecs)

Result for buffersize 524288 (average over 10000 operations):
number of operations per second: 3103.99
clock secs:0.000322166(=322.166 usecs)  cpu secs:0.000322(=322 usecs)

Result for buffersize 1048576 (average over 10000 operations):
number of operations per second: 2328.03
clock secs:0.000429547(=429.547 usecs)  cpu secs:0.00043(=430 usecs)