site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=5aN6sONE0nMj+U+de7f0q8nTjmHyrMdSTrzw9ZtCl5I=; b=VtwPDjBXg+fqPCYl1Zc9zbux0UCd/ivuiejct4g59hYJdTrIzLt40/02SVt32SId4z yqDtku2Y/pWNf90c+DVyK95sYWEE3DhV1lusBHfE7EzSY0OLrTRu8L9CCbhjbGy0gHd9 R3DokuHTYjDZX7dl4Wn0omKHTTmJGnSr+ziL0= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=kCeNMzBKzWifXz0feyRsQ3MhH7ScOYH/ffcF1NqmVICKMbNqA0ikWBzr2/IYpZFPco xLoboKAmOL+R2BkpdIiq3h8jW7TJc2719mZPUKHcVhzBYbqA6BzZueiltLgpn0DUF+Ki R2pYC9DnKXvzEHbRj0m92xi8jmF9/DzwDZrmE= On Thursday, January 14, 2010, Godfrey van der Linden <gvdl@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 _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.a... This email sent to site_archiver@lists.apple.com