group.of.nepali.translators team mailing list archive

[Robie Basak <1580534@xxxxxxxxxxxxxxxxxx>]

** Also affects: simplestreams (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1580534

Title:
  Signature verification is too slow

Status in simplestreams:
  New
Status in simplestreams package in Ubuntu:
  New
Status in simplestreams source package in Xenial:
  New

Bug description:
  When running against http://cloud-
  images.ubuntu.com/releases/streams/v1/com.ubuntu.cloud:released:download.sjson,
  read_signed() in simplestreams/utils.py seems to take minutes (402
  seconds in my instrumented timing) running 100% CPU. At the time of my
  test, download.sjson is 451737 bytes in 1870 lines.

  This makes a uvtool sync virtually unusable on Xenial.

  The culprit is the constant += of a string as it is read in. This is
  inefficient in Python as each += results in a new string that has to
  be allocated. Keeping the lines in a list and joining them at the end
  reduces the time to 0.127 seconds.

  Merge proposal to follow. I'm filing this bug to track a Xenial SRU.

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