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<div class="moz-cite-prefix">On 7/28/20 11:44 AM, David Davis wrote:<br>
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<div dir="ltr">Today we discussed this at triage. We're leaning
towards changing the default from 20 to 10 as it seems like 10
only incurs an extra 30% penalty in time while seeming to fix
the problem[0].
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<div>One question though is how we should treat existing data
because most Remotes at this point probably have a value of 20
for download_concurrency. We came up with two options that we
would like some feedback on.</div>
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<p>It seems kinda strange that the 'default' value is recorded in
the db on the remote at creation time. Any reason to just leave
it 'nil' and use the 'app default' ? This doesn't really help
with past values, but seems like a better model going forward.</p>
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cite="mid:CAHa=2Wki+tKKUQVUN=iXm1uSNjpfjPBCH5v1deguasHq0x_EBg@mail.gmail.com">
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<div># Option 1: Migrate 20 to 10</div>
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<div>This would be a migration in pulpcore that would update
download_concurrency to 10 for all Remotes whose
download_concurrency is set to 10. Something like:</div>
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Remote.objects.all().filter(download_concurrency=20).update(download_concurrency=10)</div>
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<p>My vote is for #1 because:</p>
<p>a) I imagine ~99% of people want the recommended default, so 99%
of people will either need to update this manually (if doing #2)
or face sync failures</p>
<p>b) i'd rather 99% of people not have to do anything than the 1%
that for some reason actually wanted 20 and weren't just going
with the 'recommended default' at that time. The number of people
in this case could very well be zero.<br>
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<div># Option 2: Documentation</div>
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<div>This would be similar to the migration approach but instead
of modifying our users' data, we'd document how they could do
it themselves. So something like:</div>
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<div> pulpcore-manager shell_plus -c
"Remote.objects.all().filter(download_concurrency=20).update(download_concurrency=10)</div>
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<div>Any feedback is welcome.<br>
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<div>[0] <a href="https://pulp.plan.io/issues/7186#note-2"
target="_blank" moz-do-not-send="true">https://pulp.plan.io/issues/7186#note-2</a><br>
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<div>David</div>
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<div dir="ltr" class="gmail_attr">On Mon, Jul 27, 2020 at 2:57
PM Grant Gainey <<a href="mailto:ggainey@redhat.com"
target="_blank" moz-do-not-send="true">ggainey@redhat.com</a>>
wrote:<br>
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<div dir="ltr">Hey folks,
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<div>Looking into issue <a
href="https://pulp.plan.io/issues/7212" target="_blank"
moz-do-not-send="true">7212</a> , over the weekend I did
some ad-hoc evaluations of sync-performance at various
concurrency settings. I wrote up my observations here:</div>
<div><br>
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<div><a
href="https://hackmd.io/@ggainey/pulp3_sync_concurrency"
target="_blank" moz-do-not-send="true">https://hackmd.io/@ggainey/pulp3_sync_concurrency</a><br>
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<div>Just thought folk might be interested.</div>
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<div>G</div>
-- <br>
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<div>Grant Gainey</div>
<div>Principal Software Engineer, Red Hat System
Management Engineering</div>
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