Re: which pages of the file are in the cache
Re: which pages of the file are in the cache
- Subject: Re: which pages of the file are in the cache
- From: Jonas Maebe <email@hidden>
- Date: Tue, 18 Aug 2009 18:16:02 +0200
On 18 Aug 2009, at 18:08, Terry Lambert wrote:
My understanding of the performance issues there are that they are
not related to what's in the cache, at least not after the first
run, since we will preheat the cache for processes after we know
what pages are typically in use.
This was true for 10.4, but no longer in 10.5 afaik (see rdar://problem/5139360)
.
For the non-Apple people: my bug report about the fact that the /var/
vm/app_profile/ directory was never cleaned up under 10.4 (which led
to quite a lot of disk usage when performing daily overnight
regression testing of a compiler testsuite), was closed with the
comment:
"There are no application profiles on Leopard. Similar (or better)
performance was achieved by using a more flexible read-ahead strategy."
Jonas
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