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@ -2,18 +2,25 @@ This outlines how to increase the number of shared memory buffers |
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supported by BSD/OS. By default, only 4MB of shared memory is supported |
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by BSDI. |
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Keep in mind that shared memory is not pageable. It is locked in RAM. |
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Bruce Momjian (pgman@candle.pha.pa.us) |
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--------------------------------------------------------------------------- |
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First, increase SHMMAXPGS by 1024 for every additional 4MB of shared |
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Increase SHMMAXPGS by 1024 for every additional 4MB of shared |
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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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Second, use bpatch to find the sysptsize value for the current kernel. |
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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, there are more steps outlined below. |
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--------------------------------------------------------------------------- |
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Use bpatch to find the sysptsize value for the current kernel. |
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This is computed dynamically at bootup. |
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$ bpatch -r sysptsize |
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@ -25,7 +32,3 @@ 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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This should clearly be easier to do on BSDI. I will add a BSDI FAQ for |
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PostgreSQL to cover this. One downside is that shared memory is not |
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pageable. It is locked in RAM. |
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