Date: Thu, 18 Aug 2011 11:21:54 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-current@freebsd.org Cc: pho@freebsd.org, Peter Jeremy <peterjeremy@acm.org> Subject: Re: "witness_lock_list_get: witness exhausted" Message-ID: <201108181121.54918.jhb@freebsd.org> In-Reply-To: <20110816215953.GB35017@server.vk2pj.dyndns.org> References: <20110816215953.GB35017@server.vk2pj.dyndns.org>
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On Tuesday, August 16, 2011 5:59:53 pm Peter Jeremy wrote: > I'm getting the above message when running Peter Holm's stress > test with INCARNATIONS=150 on a 16-core sparc. Does this mean > LOCK_CHILDCOUNT is too low or does it indicate a leak in witness > lock_list_entry's somewhere? Most likely the former. > The comment on LOCK_CHILDCOUNT indicates it is dimensioned to > allow 2048 threads to hold 5 locks each but it's not clear how > many threads will get started at a given INCARNATIONS count. Also, each lle holds a bucket of instances, so the same count would only let 1024 threads hold 6 locks each perhaps (depending on the bucket size.. it was originally 4 locks per lle). -- John Baldwin
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