Hi Phiip,

Thanks a lot for the answer and suggestions. As you said, bitmap works with 
single pack file. I  am checking with Peff.


On Friday, 2 September 2016 01:28:21 UTC+5:30, Philip Oakley wrote:
> ----- Original Message ----- 
> *From:* Arumuga <javascript:> 
> *To:* Git for human beings <javascript:> 
> *Sent:* Thursday, September 01, 2016 7:14 PM
> *Subject:* [git-users] git repo bitmap creation
> Hi Git Experts, 
> We have been exploring various ways to improve git cloning time, one among 
> them is using bitmap which is suppose to save time "counting objects".  but 
> i have problem creating bitmap since the repository contains 100's of pack 
> files. the bitmap file is not created when i use "git gc".
> I have the following entries in my .gitconfig.
> [pack]
>         packSizeLimit = 10m
>         writebitmaps = on
>         writeBitmapHashCache = on
> If i just dont use "packSizeLimit = 10m", then bitmap is created just by 
> running git gc
> Can you please make me understand ?, What i understood is that the bitmap 
> is created when there is a single pack file, but if i split it into 
> multiple pack file, the bitmap generation fails with the warning
> "warning: disabling bitmap writing, as some objects are not being packed".
> The bitmaps are designed (IIUC) specifically for the case of everything 
> being inside the one pack, which is the most optimal for finding the 
> objects. 
> If you have many packs thaten the search can span the packs, but the bit 
> map does not, so has to give up.
> It is worth exploring the git developers list at www.public-inbox.org/git 
> The primary author of the bitmaps code (again IIRC) was Jeff King (Peff), 
> so a quicj seach should come up with a much better explanation than my half 
> remembered, half understood reply ;-)
> --
> Philip

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