[tahoe-lafs-trac-stream] [tahoe-lafs] #1456: High latency for 'tahoe get' if 'tahoe put' in parallel

[tahoe-lafs]

#1456: High latency for 'tahoe get' if 'tahoe put' in parallel
-------------------------+-------------------------------------------------
     Reporter:  T_X      |      Owner:  T_X
         Type:  defect   |     Status:  new
     Priority:           |  Milestone:  undecided
  critical               |    Version:  1.8.2
    Component:  code     |   Keywords:  download upload latency performance
   Resolution:           |  gateway vm kvm vpn trickle
Launchpad Bug:           |
-------------------------+-------------------------------------------------

Comment (by T_X):

 [[http://krtek.asta.uni-luebeck.de/~tux/tahoe-lafs/tahoe-prepare-
 test-2-dump.cap|Here]]'s a 100MB tcpdump capture.
 It includes the 'prepare' and the 'test2' part of the test script, as well
 as some communication with the web interface on port 3457. Interestingly,
 it seems that the web interface is also totally unresponsive during
 'test2'.

 - The 'tahoe get' started at 18:49:58.

 - The web interface output is:
 {{{
 Recent Operations:
 Started         Type    Storage Index   Helper?         Total Size
 Progress        Status
 19:03:29 07-Aug-2011    publish         zb24cwlnpwynz7dtqszava76cm      No
 791B    100.0%  Finished
 19:03:29 07-Aug-2011    retrieve        zb24cwlnpwynz7dtqszava76cm      No
 791B    100.0%  Finished
 19:03:29 07-Aug-2011    mapupdate MODE_WRITE    zb24cwlnpwynz7dtqszava76cm
 No      -NA-    100.0%  Finished
 19:03:13 07-Aug-2011    download        3pysvkzdgfswxkpkfyunwzblim      No
 95B     100.0%  idle
 19:03:13 07-Aug-2011    retrieve        zb24cwlnpwynz7dtqszava76cm      No
 791B    100.0%  Finished
 19:03:12 07-Aug-2011    mapupdate MODE_READ     zb24cwlnpwynz7dtqszava76cm
 No      -NA-    100.0%  Finished
 19:03:12 07-Aug-2011    retrieve        zb24cwlnpwynz7dtqszava76cm      No
 791B    100.0%  Finished
 19:03:12 07-Aug-2011    mapupdate MODE_READ     zb24cwlnpwynz7dtqszava76cm
 No      -NA-    100.0%  Finished
 }}}

 - 'tahoe get' finished 795.44 after the start time.

-- 
Ticket URL: <http://tahoe-lafs.org/trac/tahoe-lafs/ticket/1456#comment:5>
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