Date: Thu, 19 Dec 2013 15:19:01 +0100 From: Peter Holm <peter@holm.cc> To: Andriy Gapon <avg@freebsd.org> Cc: freebsd-fs <freebsd-fs@freebsd.org> Subject: Re: namecache: numneg > 0 but ncneg is empty Message-ID: <20131219141901.GA19520@x2.osted.lan> In-Reply-To: <52B2F8BF.9050504@FreeBSD.org> References: <52B16847.8090905@FreeBSD.org> <20131219070350.GM59496@kib.kiev.ua> <52B2A6AC.3070902@FreeBSD.org> <20131219081218.GA12747@x2.osted.lan> <52B2F8BF.9050504@FreeBSD.org>
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On Thu, Dec 19, 2013 at 03:46:39PM +0200, Andriy Gapon wrote: > on 19/12/2013 10:12 Peter Holm said the following: > > On Thu, Dec 19, 2013 at 09:56:28AM +0200, Andriy Gapon wrote: > >> Peter, > >> > >> I am curious about what ideology is behind vfs testing in stress2. I know that > >> I can just look at the code myself, but hope that asking you could be faster. > >> Does stress2 exercise a certain set of scenarios? Or does it have an element of > >> randomness? > >> > > > > The tests found in stress2/testcases does everything in a random > > fashion. > > Could you please add a few words about what kind of randomness is that? > E.g. I looked at testcases/rename and it seems to do pretty predictable and > linear renaming of files within the same directory. Also, it seems that the > test would be aborted should a rename operation fail. But that would be a valid > outcome in a truly random / chaotic testing. > > > Test found in stress2/misc are for the most part scenarios that has > > been used for finding specific problems. > > > -- > Andriy Gapon For testcases/rename the number of files to rename is controlled by the random number of invocations of this test. Two new rename scenarios was added recently by jmg@ to address specific SU+J issues. More rename scenarios can be found in stress2/misc/rename* -- Peter
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