#1180: put more DYHBs into flight at once when K is larger
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Reporter: zooko | Owner:
Type: defect | Status: new
Priority: major | Milestone: soon
Component: code-network | Version: 1.8β
Resolution: | Keywords: easy immutable download
performance regression
Launchpad Bug: |
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Comment (by zooko):
Hm, did I mark this as "regression" because this makes v1.8.0 perform
noticeably worse than v1.7.1 for cases when {{{K >> 3}}}? Because that
case is increasingly interesting to me nowadays since (as mentioned in
[http://tahoe-lafs.org/pipermail/tahoe-dev/2010-September/005247.html this
mail to tahoe-dev]), I think people should probably start setting {{{K}}}
at least as large as the number of servers on their grid. Perhaps we
should even make the default value of {{{K}}} be 30 in future releases of
Tahoe-LAFS instead of 3, and make the default value of {{{M}}} be 100. Oh,
but what would that mean for the default value of {{{H}}}?
In any case, nobody to my knowledge has measured v1.8.0 to see if it
actually performs worse than v1.7.1 does due to this issue about v1.8.0
keeping at most 10 DYHB's in flight at once.
It would be great if someone would benchmark larger {{{K}}}'s.
--
Ticket URL: <http://tahoe-lafs.org/trac/tahoe-lafs/ticket/1180#comment:1>
tahoe-lafs <http://tahoe-lafs.org>
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