[tahoe-dev] [tahoe-lafs] #1170: new-downloader performs badly when downloading a lot of data from a file

[tahoe-lafs]

#1170: new-downloader performs badly when downloading a lot of data from a file
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     Reporter:  zooko         |       Owner:                                           
         Type:  defect        |      Status:  new                                      
     Priority:  critical      |   Milestone:  1.8.0                                    
    Component:  code-network  |     Version:  1.8β                                     
   Resolution:                |    Keywords:  immutable download performance regression
Launchpad Bug:                |  
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Comment (by zooko):

 If you wanted to investigate why 1.8.0c2 is so much slower than 1.7.1 at
 downloading a large file even after applying the comment:54 patch, then
 you could use attachment:run-115-flog.pickle.bz2 and
 attachment:run-116-flog.pickle.bz2 as evidence. Hm, hey waitasecond, in my
 earlier testing (recorded in this ticket), 1.8.0c2 was ''faster'' then
 1.7.1 for small files (<= 10 MB). This was also the case for Nathan
 Eisenberg's benchmarks (posted to tahoe-dev). But currently it looks to me
 like the average download speed (as reported by curl during its operation)
 is the same at the beginning of the download as at the end, i.e. even
 during the first 10 MB or so 1.8.0c2 is only getting about 150 KBps where
 1.7.1 is getting more than 200 KBps. Did something change?

 I guess I (or someone) should run 1.7.1 vs. 1.8.0c2+comment:54 on 10 MB
 files. But I'm way too tired to start that again right now.

 Man, I'm really worn out from staying up night after night poking at this
 and then having to get up early the next morning to help my children get
 ready for school and myself ready for work. I could use more help!

-- 
Ticket URL: <http://tahoe-lafs.org/trac/tahoe-lafs/ticket/1170#comment:61>
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