Date: Fri, 3 Nov 1995 21:42:52 +1100 From: Bruce Evans <bde@zeta.org.au> To: bde@zeta.org.au, wollman@lcs.mit.edu Cc: current@FreeBSD.org Subject: Re: Time problems Message-ID: <199511031042.VAA00204@godzilla.zeta.org.au>
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>Here is a program that I have used to measure a whole bunch of things >about the clock... I get the following output for `rtprio 0 ./thisprog' on a lightly loaded DX2/66 VLB (ISA clock :-() system running -current: min 13, max 171, mean 14.286634, std 1.836667 1th: 14 (1053245 observations) 2th: 15 (587593 observations) 3th: 13 (299847 observations) 4th: 16 (51817 observations) 5th: 33 (934 observations) This is the expected behaviour. After reducing N from 2000000 to 100000, I get the following output for `./thisprog' on a heavily loaded DX2/66 VLB (ISA clock :-() system running Linux 1.2.13: Segmentation fault >#define N 2000000 >int diffs[N]; >int hist[N]; hist[] has indices min..max, not 0..N-1. max was abour 230000 under Linux, so an index was out of bounds because I reduced N. min might be < 0 if gettimeofday() is broken. Bruce
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