| From: | ITAGAKI Takahiro <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp> |
|---|---|
| To: | Decibel! <decibel(at)decibel(dot)org> |
| Cc: | pgsql-patches(at)postgresql(dot)org |
| Subject: | Re: Reduce the size of PageFreeSpaceInfo on 64bit platform |
| Date: | 2007-08-13 01:40:31 |
| Message-ID: | 20070813102754.6A35.ITAGAKI.TAKAHIRO@oss.ntt.co.jp |
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| Lists: | pgsql-patches |
Decibel! <decibel(at)decibel(dot)org> wrote:
> > The sizeof(PageFreeSpaceInfo) is 16 bytes
> So... does that mean that the comment in the config file about 6 bytes
> per page is incorrect?
There are no comments the usage of maintenance_work_mem in the config file
nor the documentation. Memory consumed by max_fsm_pages is only mentioned.
#maintenance_work_mem = 16MB # min 1MB
#max_fsm_pages = 204800 # min max_fsm_relations*16, 6 bytes each
But surely the difference of memory usage between maintenance_work_mem
and max_fsm_pages might confuse users. I'll rewrite my patch to use
FSMPageData in both places so that users can always estimate the memory
to 6 bytes per page.
Regards,
---
ITAGAKI Takahiro
NTT Open Source Software Center
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