Date: Thu, 20 Aug 2015 13:45:59 -0400 From: "Michael W. Lucas" <mwlucas@michaelwlucas.com> To: fs@freebsd.org Subject: DTrace to measure ZFS operations & latency Message-ID: <20150820174559.GA28318@mail.michaelwlucas.com>
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Hi, I'm working on measuring the number & latency of async operations in ZFS. (Yes, this is still for the ZFS book.) There's a nice script at http://dtrace.org/blogs/ahl/2014/08/31/openzfs-tuning/, but it's illumos-specific. I try to run the script on last week's -current and get: # dtrace -s q.d zroot dtrace: failed to compile script q.d: line 4: probe description fbt::vdev_queue_max_async_writes:entry does not match any probes Any chance someone could help me out here? Thanks, ==ml PS: The script is: #pragma D option aggpack #pragma D option quiet fbt::vdev_queue_max_async_writes:entry { self->spa = args[0]; } fbt::vdev_queue_max_async_writes:return /self->spa && self->spa->spa_name == $$1/ { @ = lquantize(args[1], 0, 30, 1); } tick-1s { printa(@); clear(@); } -- Michael W. Lucas - mwlucas@michaelwlucas.com, Twitter @mwlauthor http://www.MichaelWLucas.com/, http://blather.MichaelWLucas.com/
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