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: 11207.7
clock secs:8.92244e-05(=89.2244 usecs)  cpu secs:9e-05(=90 usecs)

Result for buffersize 2048 (average over 10000 operations):
number of operations per second: 11209.1
clock secs:8.92132e-05(=89.2132 usecs)  cpu secs:8.9e-05(=89 usecs)

Result for buffersize 4096 (average over 10000 operations):
number of operations per second: 11208.9
clock secs:8.92145e-05(=89.2145 usecs)  cpu secs:8.9e-05(=89 usecs)

Result for buffersize 8192 (average over 10000 operations):
number of operations per second: 11030.6
clock secs:9.06566e-05(=90.6566 usecs)  cpu secs:9.1e-05(=91 usecs)

Result for buffersize 16384 (average over 10000 operations):
number of operations per second: 10831.2
clock secs:9.23262e-05(=92.3262 usecs)  cpu secs:9.2e-05(=92 usecs)

Result for buffersize 32768 (average over 10000 operations):
number of operations per second: 10616.4
clock secs:9.41939e-05(=94.1939 usecs)  cpu secs:9.4e-05(=94 usecs)

Result for buffersize 65536 (average over 10000 operations):
number of operations per second: 9842.67
clock secs:0.000101598(=101.598 usecs)  cpu secs:0.000102(=102 usecs)

Result for buffersize 131072 (average over 10000 operations):
number of operations per second: 8782.23
clock secs:0.000113866(=113.866 usecs)  cpu secs:0.000114(=114 usecs)

Result for buffersize 262144 (average over 10000 operations):
number of operations per second: 7157.02
clock secs:0.000139723(=139.723 usecs)  cpu secs:0.00014(=140 usecs)

Result for buffersize 524288 (average over 10000 operations):
number of operations per second: 4939.78
clock secs:0.000202438(=202.438 usecs)  cpu secs:0.000202(=202 usecs)

Result for buffersize 1048576 (average over 10000 operations):
number of operations per second: 3253.95
clock secs:0.000307319(=307.318 usecs)  cpu secs:0.000307(=307 usecs)

Result for buffersize 2097152 (average over 10000 operations):
number of operations per second: 1973.28
clock secs:0.000506771(=506.771 usecs)  cpu secs:0.000507(=507 usecs)