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80 lines
2.5 KiB
Plaintext
80 lines
2.5 KiB
Plaintext
This outlines modifications to BSD/OS for running PostgreSQL:
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1) How to increase resource limits
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2) How to increase the number of shared memory buffers
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3) How to increasing the number of semaphores
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Bruce Momjian (pgman@candle.pha.pa.us) 2000-07-7
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---------------------------------------------------------------------------
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1) To increase the amount of malloc'ed memory and files opened by
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PostgreSQL, add this:
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:datasize-cur=600M:\
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:openfiles-cur=256:
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to your /etc/login.conf file.
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---------------------------------------------------------------------------
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2a) By default, only 4MB of shared memory is supported by BSDI. Keep in
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mind that shared memory is not pageable. It is locked in RAM.
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To increase the number of buffers supported by the postmaseter, increase
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SHMMAXPGS by 1024 for every additional 4MB of shared memory:
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/sys/sys/shm.h:69:#define SHMMAXPGS 1024 /* max hardware pages...
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The default setting of 1024 is for a maximum of 4MB of shared memory.
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For those running 4.1 or later, just recompile the kernel and reboot.
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For those running earlier releases, see step 2b.
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---------------------------------------------------------------------------
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2b) For 4.01 and earlier, use bpatch to find the sysptsize value for
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the current kernel. This is computed dynamically at bootup.
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$ bpatch -r sysptsize
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0x9 = 9
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Next, change SYSPTSIZE to a hard-coded value. Use the bpatch value,
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plus add 1 for every additional 4MB of shared memory you desire.
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/sys/i386/i386/i386_param.c:28:#define SYSPTSIZE 0 /* dynamically...
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sysptsize can not be changed by sysctl on the fly.
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---------------------------------------------------------------------------
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3) How to increasing the number of semaphores.
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You may need to increase the number of sysv semaphores. By default,
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PostgreSQL allocates 32 semaphores, one for each backend connection.
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This is just over half the default system total of 60.
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The defaults are in /sys/sys/sem.h:
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/* Configuration parameters */
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#ifndef SEMMNI
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#define SEMMNI 10 /* # of semaphore identifiers */
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#endif
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#ifndef SEMMNS
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#define SEMMNS 60 /* # of semaphores in system */
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#endif
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#ifndef SEMUME
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#define SEMUME 10 /* max # of undo entries per process */
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#endif
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#ifndef SEMMNU
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#define SEMMNU 30 /* # of undo structures in system */
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#endif
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Set the values you want in your kernel config file, e.g.:
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options "SEMMNI=40"
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options "SEMMNS=240"
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options "SEMUME=40"
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options "SEMMNU=120"
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