[Bug 973494] Re: Retracing is way too slow

[Evan Dandrea]

We'll need to ensure that the sandboxes created with --sandbox-dir are
per-release:

[2:56pm] pitti: one scenario where this would fail is:
[2:56pm] pitti: - retrace a bug on package foo version 1
[2:56pm] pitti: - retrace the next bug with foo version 2
[2:56pm] pitti: (unpacks v2 over v1)
[2:56pm] pitti: - retrace the next bug with foo version 1
[2:56pm] pitti: -> does not change any file, as both versions are considered unpacked
[2:56pm] pitti: so you'd gdb against v2 when you want v1
[2:56pm] pitti: now, we do not actually support his yet
[2:57pm] pitti: as apport always takes the latest available version of a package
[2:57pm] pitti: but you will at least need to take care to have a per-release sandbox

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https://bugs.launchpad.net/bugs/973494

Title:
  Retracing is way too slow

Status in “apport” package in Ubuntu:
  Fix Released
Status in “whoopsie-daisy” package in Ubuntu:
  Confirmed

Bug description:
  We're currently only able to process about three core files per minute
  with each retracer. We can fire up more retracers and drop some core
  files at random when we're approaching a high load, both of which
  mitigate this problem to varying degrees. However, we should also
  address the problem that our current retracing code is taking far too
  long to process each core file:

  [4:40pm] jjo: ev: basically afaics we are losing the producer|consumer rate battle
  [4:40pm] mthaddon: ev: basically the rabbitmq queues are fairly consistently increasing in size, but the server itself is very lightly loaded - should we be firing up more retracers, or is there some way of making existing retracers do more work?
  [4:40pm] jjo: ev: while finfolk doesnt get squeezed for load
  [4:41pm] ev: the retracers process in serial, so bringing up more of them would be advisable
  [4:41pm] jjo: ev: FTR I had fired up to ~7 retracers in parallel , which hover'd loadavg~=8 -> got ~3 oopsen per min
  [4:41pm] jjo: ev: but still I couldn't manage to get more than ~3/min

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