Vivek, Thanks, for your reply. May I ask what you system setup is like (i.e. memory and such)?
----- Original Message ----- From: "Vivek Khera" <[EMAIL PROTECTED]> Newsgroups: ml.postgres.performance To: <[EMAIL PROTECTED]> Sent: Tuesday, July 15, 2003 11:44 AM Subject: Re: [PERFORM] Tunning FreeeBSD and PostgreSQL > >>>>> "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 > > ---------------------------(end of broadcast)--------------------------- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
