| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
| Cc: | Qingqing Zhou <zhouqq(at)cs(dot)toronto(dot)edu>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Remove the limit on the number of entries allowed in catcaches, |
| Date: | 2006-06-15 19:18:05 |
| Message-ID: | 156.1150399085@sss.pgh.pa.us |
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Simon Riggs <simon(at)2ndquadrant(dot)com> writes:
> The LRU moves each time we do FileRead or FileWrite, not just on
> open/close operations.
Sure, but those still require kernel calls, so the cost of a couple of
pointer swings is negligible. There's no way that the logical
complexity of sometimes maintaining LRU and sometimes not is going
to be repaid with a useful (or even measurable) speedup.
regards, tom lane
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