> On Feb 18, 2016, at 6:44 AM, Josh Fisher <jfis...@pvct.com> wrote: > > On 2/17/2016 6:07 PM, Dan Langille wrote: >>> On Feb 17, 2016, at 9:57 AM, Martin Simmons < >>> <mailto:mar...@lispworks.com>mar...@lispworks.com >>> <mailto:mar...@lispworks.com>> wrote: >>> >>>>>>>> On Tue, 16 Feb 2016 18:59:10 -0500, Dan Langille said: >>>> >>>> As a test, I scp'd over all the volumes for one job and timed it: >>>> >>>> real 167m15.956s >>>> user 117m51.006s >>>> sys 23m56.653s >>>> >>>> FWIW, these copies were done while a ZFS scrub was underway, so if >>>> anything, the potential throughput is higher. >>>> >>>> The job above, took nearly 11 hours. Something is up. >>>> >>>> I tried another test run, just now, but cancelled it after the first two >>>> Volumes were read; it was going at about the same rate as the full job >>>> mentioned above. >>>> >>>> What might account for this vast difference? >>> >>> You could try profiling it, e.g >>> http://www.brendangregg.com/FlameGraphs/cpuflamegraphs.html#DTrace >>> <http://www.brendangregg.com/FlameGraphs/cpuflamegraphs.html#DTrace> >> >> >> This is a great idea. Have you done this before? I haven't and my first >> attempt seems to be interesting. >> >> http://www.langille.org/tmp/bacula-copy.svg >> <http://www.langille.org/tmp/bacula-copy.svg> >> >> It didn't run very long, and thus I'm not sure how relevant the information >> is > > Interesting, Dan. I wonder what it looks like for that same job with > encryption turned off. If I am reading the graph correctly, it looks like AES > encryption is more than doubling the CPU usage.
To be clear, this was TLS. I just disabled TLS for bacula-sd and ran it again: http://www.langille.org/tmp/bacula-copy-without-tls.svg <http://www.langille.org/tmp/bacula-copy-without-tls.svg> I don't know how representative these brief captures are. -- Dan Langille - BSDCan / PGCon d...@langille.org
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