The following parameters can be used to change the number of semaphores, the amount of shared memory and the number of IPC messages. They're set in /etc/system, as usual.
set semsys:seminfo_semusz = <value> set semsys:seminfo_semopm = <value> set semsys:seminfo_semume = <value> set semsys:seminfo_semaem = <value> set semsys:seminfo_semmap = <value> set semsys:seminfo_semvmx = <value> set semsys:seminfo_semmsl = <value> set semsys:seminfo_semmni = <value> set semsys:seminfo_semmns = <value> set semsys:seminfo_semmnu = <value> set shmsys:shminfo_shmmin = <value> set shmsys:shminfo_shmseg = <value> set shmsys:shminfo_shmmax = <value> set shmsys:shminfo_shmmni = <value> set msgsys:msginfo_msgseg = <value> set msgsys:msginfo_msgssz = <value> set msgsys:msginfo_msgtql = <value> set msgsys:msginfo_msgmap = <value> set msgsys:msginfo_msgmax = <value> set msgsys:msginfo_msgmnb = <value> set msgsys:msginfo_msgmni = <value>
In Solaris 10 all of these tunables are gone; they have either been removed as non-sensical or they have been replaced with rctls. (And about time too!)