Date: Fri, 5 Apr 1996 12:39:49 -0800 (PST) From: asami@cs.berkeley.edu (Satoshi Asami) To: julian@ref.tfs.com Cc: mrami@minerva.cis.yale.edu, current@freebsd.org, nisha@cs.berkeley.edu, tege@matematik.su.se, hasty@rah.star-gate.com Subject: Re: fast memory copy for large data sizes Message-ID: <199604052039.MAA25813@silvia.HIP.Berkeley.EDU> In-Reply-To: <199604052011.MAA13929@ref.tfs.com> (julian@ref.tfs.com)
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Marc, thanks for running the test. * > sh runtests * > size libc ours * > 32 7.629395 MB/s 7.629395 MB/s * > 64 12.207031 MB/s 4.695012 MB/s * [...] * > 2097152 12.164192 MB/s 7.725020 MB/s * > 4194304 12.290410 MB/s 7.719504 MB/s * > mrami[~/bcopy]$ * * these tests SEEM to be indicating that the bcopy in libc * is already better! or am I misreading something? No, it only shows the libc version is faster on a 486. We expected that, as the FP unit on a 486 is much slower than a Pentium. (Even a straight int -> FP conversion takes a lot of time I guess.) Any other Pentium owners? :) Satoshi
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