doubts about MDMF download "linear in k" slowdown
[Imported from Trac: page Performance/Sep2011, version 5]
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@ -94,3 +94,27 @@ Some graphs were added to
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Complete benchmark toolchain and data included in
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Complete benchmark toolchain and data included in
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[atlasperf.git.tar.gz](../raw/attachments/Performance/Sep2011/atlasperf.git.tar.gz)
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[atlasperf.git.tar.gz](../raw/attachments/Performance/Sep2011/atlasperf.git.tar.gz)
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Zooko raised the question (20-May-2012) on IRC:
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```
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<zooko> warner: this page says that K=60 takes twice as long as K=30:
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<zooko> https://tahoe-lafs.org/trac/tahoe-lafs/wiki/Performance/Sep2011
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<zooko> But these graphs seems to show those two taking about the same time as
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each other:
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<zooko>
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https://tahoe-lafs.org/trac/tahoe-lafs/attachment/wiki/Performance/Sep2011/MDMF-100MB-partial.png
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<zooko>
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https://tahoe-lafs.org/trac/tahoe-lafs/attachment/wiki/Performance/Sep2011/MDMF-1MB-partial.png
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<zooko> I hope the latter is true. :-)
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```
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Those partial-read graphs certainly don't show a linear difference
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between k=30 and k=60. At best there might be a 4% difference between
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k=3 and k=30, and k=30/k=60 look identical.
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I think I was prompted to write that sentence by looking at the yellow
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"trunk-MDMF" line in the [CHKMDMF-100MB-vs-k.png](../raw/attachments/Performance/Sep2011/CHKMDMF-100MB-vs-k.png) graph, which
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*does* show a linear slowdown with increasing k (with a lower multiplier
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than the new-immutable-downloader). I don't know how to reconcile the
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two. So something is funny, and I need to review the data, and possible
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run new tests.
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