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On Thursday, January 14, 2010, Godfrey van der Linden <gvdl(a)mac.com> wrote:
> G'day, All.
> I was captured while passing a friend today and asked a question I couldn't answer. What is the "Object cache" reported by vm_stat and why is its hit-rate so low?
> This is a vm_stat report from my 10.6.2 '06 iMac.
> Mach Virtual Memory Statistics: (page size of 4096 bytes)Pages free: 52226.Pages active: 221914.Pages inactive: 40479.Pages speculative: 7129.Pages wired down: 71206."Translation faults": 374933705.Pages copy-on-write: 3220998.Pages zero filled: 228364806.Pages reactivated: 45183.Pageins: 417732.Pageouts: 32436.Object cache: 193 hits of 1728118 lookups (0% hit rate)
> Further here is the uptime on my system
> 14:50 up 11 days, 5:34, 10 users, load averages: 0.38 0.22 0.17
> In a system that has been up 11 days only 193 hits from 2 million attempts seems to indicate that the cache is pointless. This cache only seems to get hit on average twice a second.
> Godfrey
I have no idea, but I'm intrigued as to what you really meant to say
when you said "twice a second"...
~ Nathan
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