This bug was fixed in the package simplestreams - 0.1.0~bzr430-0ubuntu1
---------------
simplestreams (0.1.0~bzr430-0ubuntu1) yakkety; urgency=medium
* New upstream snapshot.
- set a default user agent (LP: #1578622)
- glance mirror: do not require that hypervisor_config be
present (LP: #1578624)
- Optimise read_signed method for better performance (LP: #1580534)
-- Scott Moser <smo...@ubuntu.com> Thu, 12 May 2016 12:55:30 -0400
** Changed in: simplestreams (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1580534
Title:
Signature verification is too slow
Status in simplestreams:
Fix Committed
Status in simplestreams package in Ubuntu:
Fix Released
Status in simplestreams source package in Xenial:
Confirmed
Bug description:
[Impact]
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.
[Development Fix]
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.
[Stable Fix]
No change cherry-pick of fix committed upstream.
[Test Case]
On a machine with reasonable connectivity, run: uvt-simplestreams-
libvirt sync release=xenial arch=amd64
Expected result: takes a few seconds with minimal CPU use.
Actual result: takes more than five minutes with CPU pegged at 100%.
Scott also has a more direct test case here:
http://paste.ubuntu.com/16377613/
[Original Notes]
Merge proposal to follow. I'm filing this bug to track a Xenial SRU.
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