Re: [PATCH 11/19] pack-objects: use bitmaps when packing objects

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Thu, Oct 24, 2013 at 6:04 PM, Jeff King <peff@xxxxxxxx> wrote:
> For bitmaps to be used, the following must be true:
>
>   1. We must be packing to stdout (as a normal `pack-objects` from
>      `upload-pack` would do).
>
>   2. There must be a .bitmap index containing at least one of the
>      "have" objects that the client is asking for.

The client must explicitly "have" a commit that has a bitmap? In JGit
we allow the client to have anything, and walk backwards using
traditional graph traversal until a bitmap is found.

> @@ -704,6 +759,18 @@ static void write_pack_file(void)
>                 offset = write_pack_header(f, nr_remaining);
>                 if (!offset)
>                         die_errno("unable to write pack header");
> +
> +               if (reuse_packfile) {
> +                       off_t packfile_size;
> +                       assert(pack_to_stdout);
> +
> +                       packfile_size = write_reused_pack(f);
> +                       if (!packfile_size)
> +                               die_errno("failed to re-use existing pack");
> +
> +                       offset += packfile_size;
> +               }
> +
>                 nr_written = 0;
>                 for (; i < to_pack.nr_objects; i++) {
>                         struct object_entry *e = write_order[i];

Can reuse_packfile be true at the same time as to_pack.nr_objects > 0?

In JGit we write the to_pack list first, then the reuse pack. Our
rationale was the to_pack list is recent objects that are newer and
would appear first in a traditional traversal, so they should go at
the front of the stream. This does mean if they delta compress against
an object in that reuse_packfile slice they have to use REF_DELTA
instead of OFS_DELTA.


Is this series running on github.com/torvalds/linux? Last Saturday I
ran a live demo clone comparing github.com/torvalds/linux to a JGit
bitmap clone and some guy heckled me because GitHub was only a few
seconds slower. :-)
--
To unsubscribe from this list: send the line "unsubscribe git" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Linux Kernel Development]     [Gcc Help]     [IETF Annouce]     [DCCP]     [Netdev]     [Networking]     [Security]     [V4L]     [Bugtraq]     [Yosemite]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux SCSI]     [Fedora Users]