Changes between Version 69 and Version 72 of Ticket #1170


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Timestamp:
2010-08-21T00:59:01Z (14 years ago)
Author:
zooko
Comment:

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  • Ticket #1170 – Description

    v69 v72  
    11I tried to download a movie file from Test Grid with Tahoe-LAFS v1.8.0c2 (new-downloader) and the file wouldn't download fast enough or smoothly enough to watch in a streaming fashion during download.
    2 
    3 If you look at the download status that I posted on #1169: http://tahoe-lafs.org/trac/tahoe-lafs/attachment/ticket/1169/down-0.html , you'll see that it often took a second or two to fetch a single segment. Also, I don't exactly understand the meaning of the fields (hence #1169), but it looks like downloader was scheduling up a large number of 32-byte reads. Is that right? Were those getting coalesced before sending them?
    4 
    5 It could just be that the current test grid has servers that take seconds to respond to requests and downloader can't do much about that. Is that what happened? ''Could'' downloader have done something about it, such as by choosing different servers instead of the ones that responded so slowly?
    6 
    7 I guess I should compare old-downloader to new-downloader behavior on the Test Grid, but right now I have to go to sleep!
    8 
    9 Oh, other people could do that comparison with this file if they like:
    10 
    11 http://localhost:3456/file/URI%3ACHK%3A4klgnafrwsm2nx3bqy24ygac5a%3Acrz7nhthi4bevzrug6xwgif2vhiacp7wk2cfmjutoz2ns3w45qza%3A3%3A10%3A1490710513/@@named=/bbb-360p24.i420.lossless.drc.ogg.fixed.ogg%2Bbbb-24fps.flac.via-ffmpeg.ogg
    122
    133Some of Zooko's most recent measurements:
    … …  
    3828|| [attachment:runs-122,123,124,125,126,127-curl-stdout.4.txt 126] || 1.7.1   || 100 MB || 223 || noflog   ||
    3929|| [attachment:runs-122,123,124,125,126,127-curl-stdout.4.txt 127] || 1.8.0c2 || 100 MB || 155 || noflog, [attachment:spans.py.diff spans.py.diff] + comment:54, nologging in immutable/download/*.py                         ||
     30|| [attachment:runs-129,130,131,132,133,134,135,136,137,138,139-curl-stdout.txt 129] || 1.8.0c2 || 100 MB || 291 || on office network, noflog, [attachment:1170-combo.diff 1170-combo.diff]                         ||
     31|| [attachment:runs-129,130,131,132,133,134,135,136,137,138,139-curl-stdout.txt 130] || 1.8.0c2 || 100 MB || 179 || on office network, noflog, [attachment:1170-combo.diff 1170-combo.diff]                         ||
     32|| [attachment:runs-129,130,131,132,133,134,135,136,137,138,139-curl-stdout.txt 131] || 1.8.0c2 || 100 MB || 276 || on office network, noflog, [attachment:1170-combo.diff 1170-combo.diff]                         ||
     33|| [attachment:runs-129,130,131,132,133,134,135,136,137,138,139-curl-stdout.txt 132] || 1.8.0c2 || 100 MB || 179 || on office network, noflog, [attachment:1170-combo.diff 1170-combo.diff]                         ||
     34|| [attachment:runs-129,130,131,132,133,134,135,136,137,138,139-curl-stdout.txt 133] || 1.8.0c2 || 100 MB || 279 || on office network, noflog, [attachment:1170-combo.diff 1170-combo.diff]                         ||
     35|| [attachment:runs-129,130,131,132,133,134,135,136,137,138,139-curl-stdout.txt 134] || 1.8.0c2 || 100 MB || 262 || on office network, noflog, [attachment:1170-combo.diff 1170-combo.diff]                         ||
     36|| [attachment:runs-129,130,131,132,133,134,135,136,137,138,139-curl-stdout.txt 135] || 1.8.0c2 || 100 MB || 180 || on office network, noflog, [attachment:1170-combo.diff 1170-combo.diff]                         ||
     37|| [attachment:runs-129,130,131,132,133,134,135,136,137,138,139-curl-stdout.txt 136] || 1.8.0c2 || 100 MB || 284 || on office network, noflog, [attachment:1170-combo.diff 1170-combo.diff]                         ||
     38|| [attachment:runs-129,130,131,132,133,134,135,136,137,138,139-curl-stdout.txt 137] || 1.8.0c2 || 100 MB || 286 || on office network, noflog, [attachment:1170-combo.diff 1170-combo.diff]                         ||
     39|| [attachment:runs-129,130,131,132,133,134,135,136,137,138,139-curl-stdout.txt 138] || 1.7.1   || 867 MB || 265 || on office network, noflog                          ||
     40|| [attachment:runs-129,130,131,132,133,134,135,136,137,138,139-curl-stdout.txt 139] || 1.8.0c2 || 866 MB || 169 || on office network, noflog, [attachment:1170-combo.diff 1170-combo.diff]                         ||