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Aucbvax.4090 fa.unix-wizards utzoo!decvax!ucbvax!unix-wizards Mon Sep 28 19:54:23 1981 profiling kernel changes >From day@RAND-UNIX Mon Sep 28 19:37:56 1981 I thought of an interesting way to determine the effect a kernel change will have on performance: Write your changes like this: if (newway) new code with statistics gathering else old code with statistics gathering

and have the clock interrupt handler complement the value of `newway' every interval of, say, 5 minutes. Since the system load will vary randomly with respect to your timing interval, after several intervals you will have statistics for the old and new ways under approximately the same load.

--dave

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