bzr fast-import performance slows over time

Ian Clatworthy ian.clatworthy at
Tue Apr 14 04:37:23 BST 2009

Brian de Alwis wrote:
> The commit performance is definitely on a downwards trend :-(  Log below.
> On 9-Apr-2009, at 8:30 PM, Brian de Alwis wrote:
>> Hi Ian.  With the new brisbane-core formats landed and your
>> fast-import improvements, I thought I'd give importing the NetBSD
>> repository another whirl.  I seem some interesting behaviour though --
>> it starts off very fast (417 commits a minute!) and then slows down
>> over time.  I've appended the log from the last 5 hours.  This
>> repository has about 14 years of development, I believe this
>> repository has many many heads, which may partially account for this.
>> This is still far speedier that the previous fast-import performance.


I'm seeing the same thing on pretty much every import. I'm yet to look
into why. As you're seeing, for really deep histories, the pack times
get huge so that's part of the story, but certainly not the only part.

Ian C.

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