>>>>> "SH" == Stephen Howie <[EMAIL PROTECTED]> writes:
SH> Richard- SH> That was very helpfull Thanks! SH> I still would like some guidance on tunning FreeBSD (shmmax and shmmaxpgs). SH> Do I need to even touch these settings? Here's what I use on FreeBSD 4.7/4.8. The kernel settings don't hurt anything being too large for the SHM values, since they are limits, not anything pre-allocated (from my understanding). These settings allow for up to 100,000 shared buffers (I currently only use 30,000 buffers) options SYSVMSG #SYSV-style message queues # only purpose of this box is to run PostgreSQL, which needs tons of shared # memory, and some semaphores. # Postgres allocates buffers in 8k chunks, so tell Postgres to use about # 150 fewer than SHMMAXPGS/2 buffers to leave some room for other Postgres # shared memory needs. options SYSVSHM #SYSV-style shared memory # Maximum number of shared memory pages system wide. options SHMALL=262144 # Maximum size, in pages (4k), of a single System V shared memory region. options SHMMAXPGS=262144 # only need semaphores for PostgreSQL options SYSVSEM #SYSV-style semaphores # Maximum number of System V semaphores that can be used on the system at # one time. options SEMMNI=32 # Total number of semaphores system wide options SEMMNS=512 # Maximum number of entries in a semaphore map. options SEMMAP=256 Also, in /etc/sysctl.conf I put # need lots of files for database kern.maxfiles=8000 # tuning for PostgreSQL kern.ipc.shm_use_phys=1 -- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Vivek Khera, Ph.D. Khera Communications, Inc. Internet: [EMAIL PROTECTED] Rockville, MD +1-240-453-8497 AIM: vivekkhera Y!: vivek_khera http://www.khera.org/~vivek/ ---------------------------(end of broadcast)--------------------------- TIP 4: Don't 'kill -9' the postmaster
