Date: Mon, 03 Mar 2008 13:17:31 -0800 From: Bakul Shah <bakul@bitblocks.com> To: gnn@freebsd.org Cc: current@freebsd.org Subject: Re: Differences in malloc between 6 and 7? Message-ID: <20080303211731.D89A05B30@mail.bitblocks.com> In-Reply-To: Your message of "Mon, 03 Mar 2008 15:23:33 EST." <7ifxv7pnei.wl%gnn@neville-neil.com>
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On Mon, 03 Mar 2008 15:23:33 EST gnn@freebsd.org wrote: > One of the folks I'm working with found this. The following code, > which yes, is just an example, is 1/2 as fast on 7.0-RELEASE as on > 6.3. Where should I look to find out why? Specifying malloc option K (double virtual memory chunk size) roughly halves the runtime. Additional Ks reduce it more and more. As this test spends most of its time in the kernel, may be this is just due to the mmap overhead? Or may be the defaults for 6.3 were different.
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