Date: Tue, 19 Jan 2010 18:18:48 -0500 From: "Mikhail T." <mi+thun@aldan.algebra.com> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: alc@freebsd.org, Peter Jeremy <peterjeremy@optushome.com.au>, stable@freebsd.org Subject: Re: An old gripe: Reading via mmap stinks Message-ID: <4B563DD8.9050303@aldan.algebra.com> In-Reply-To: <201001150256.o0F2ucOx080837@apollo.backplane.com> References: <200603232352.k2NNqPS8018729@gate.bitblocks.com> <200603241518.01027.mi%2Bmx@aldan.algebra.com> <20060325103927.GE703@turion.vk2pj.dyndns.org> <200603250920.14208@aldan> <20060325190333.GD7001@funkthat.com> <4B4F7CF5.4040307@aldan.algebra.com> <201001150256.o0F2ucOx080837@apollo.backplane.com>
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01/14/10 21:56, Matthew Dillon ΞΑΠΙΣΑΧ(ΜΑ):
> This would explain why the performance is not as bad as linux but
> is not as good as a properly pipelined case.
For what it may be worth, here are the stats for Solaris as well:
* Solaris 8, native, 32-bit binary (using -lcrypto instead of -lmd):
mmap: 103.54u 27.18s 2:56.46 74.0%
read: 99.12u 40.37s 2:53.06 80.6%
* Solaris 10, native, 32-bit binary (using -lcrypto instead of -lmd):
mmap: 159.36u 83.23s 5:28.25 73.9%
read: 173.50u 104.16s 4:48.30 96.3%
* Solaris 10, using the 32-bit binary built on Solaris-8:
mmap: 217.74u 101.20s 5:58.89 88.8%
All of the "read" results on Solaris (and earlier on Linux) were
obtained from using ``openssl md5 < largefile''.
Seems like BSD is not the only OS, where the mmap's theoretical promise
lags behind the actual offering -- read wins on Solaris overall too,
despite being quite a bit more expensive in sys-time. Would still be
nice to be the first to deliver...
-mi
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