Date: Fri, 16 Aug 2002 10:34:37 -0700 From: David Greenman-Lawrence <dg@dglawrence.com> To: Bruce Evans <bde@zeta.org.au> Cc: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/kern uipc_socket2.c Message-ID: <20020816103437.J42978@nexus.root.com> In-Reply-To: <20020816101613.I42978@nexus.root.com>; from dg@dglawrence.com on Fri, Aug 16, 2002 at 10:16:13AM -0700 References: <20020815221609.E42978@nexus.root.com> <20020816212205.N6756-100000@gamplex.bde.org> <20020816101613.I42978@nexus.root.com>
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>>> I'm looking at calcru() as well, since is does four 64bit divides and
>>> was as expensive as sbreserve() in my profiles. The __qdivrem function
>>> that does the 64bit divide appears to consume several thousand instructions
>>> in the common case. Something to avoid if at all possible.
>>
>>calcru() didn't seem to be so bad in my profiles. I think its efficiency
>>only matters if you have a lot of very short lived processes, or if you
>>have processes that call getrusage() too much.
>
> In my particular tests, processes had a lifetime of less than 10us (i.e.
^^^
Oops, should be 100us.
>were forking + exiting at a rate of > 10000/second). This was an app that
>creates a process, does a TCP network connect, receives and processes a
>packet of data, and sends a response - a typical transaction oriented network
>application.
>
>-DG
>
>D.G.Lawrence
>Download Technologies, Inc. - http://www.downloadtech.com - (866) 399 8500
>TeraSolutions, Inc. - http://www.terasolutions.com - (503) 288 9544
>The FreeBSD Project - http://www.freebsd.org
>Pave the road of life with opportunities.
>
-DG
D.G.Lawrence
Download Technologies, Inc. - http://www.downloadtech.com - (866) 399 8500
TeraSolutions, Inc. - http://www.terasolutions.com - (503) 288 9544
The FreeBSD Project - http://www.freebsd.org
Pave the road of life with opportunities.
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