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How can google gerrit project to be clone so fast? [message #1844445]

Tue, 14 September 2021 09:33

Y C

Messages: 2
Registered: September 2021

Junior Member

Here is my post on stackoverflow in my attachment

Now i know gerrit gc will create bitmap to drastically descrase couting objects time.
However i still get a really long time "finding sources" phase than google git project.
Is there anything i miss?

Attachment: 1.png
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Re: How can google gerrit project to be clone so fast? [message #1844459 is a reply to message #1844445]

Tue, 14 September 2021 13:23

Matthias Sohn

Messages: 1249
Registered: July 2009

Senior Member

I guess they use bitmap indexes which speed up the counting phase of fetch commands.

https://kscherer.github.io/git/2015/05/15/git-and-bitmaps
https://git-scm.com/docs/bitmap-format
https://git.eclipse.org/r/c/jgit/jgit/+/7939/

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Re: How can google gerrit project to be clone so fast? [message #1844495 is a reply to message #1844459]

Wed, 15 September 2021 08:40

Y C

Messages: 2
Registered: September 2021

Junior Member

You're right.
But i already figure it out and did "gerrit gc --aggressive" to my host project.
The "Couting Objects" phase is indeed faster than before. minutes to less than 1 seconds.

However it's still really strange.
FIrst. i will stuck at "cloning into" phase for 24 seconds. where google only spends 3 seconds.
Second, google spend less than 1 second at "Finding Sources" phase. but i still need to spend 1 minute at "Finding Sources" phase. Google's "finding sources" shows only 153/153 where my project shows millions.

Is there anyone who can tell me what is "Finding sources"?

[Updated on: Wed, 15 September 2021 14:37]

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