My version of truss does not have -c flag, or any other flag similar to the one I used with trace under Linux.


On Linux :
$ /sbin/sysctl -a |grep shm
... <snip error msgs>
vm.hugetlb_shm_group = 0
kernel.shmmni = 4096
kernel.shmall = 2097152
kernel.shmmax = 33554432

Q: Why would SHM parameters affect semaphore performance?

Also, just in case I ran this
$ /sbin/sysctl -a |grep sem
<snip error msgs>
kernel.sem = 250 32000 32 128