suboptimal behavior of fast-import in some cases with "from"

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

 



Hi,

I did something "stupid" with a script using fast-import, and that made
the whole process ~20% slower on Linux and 400~500% slower on Mac. The
reason this happened is that the script was essentially adding a "from"
to every "commit" command, even when the "from" commit is the current
head of the branch.

One of the first things parse_from does is unconditionally throw away
the tree for the given branch, and then the "from" tree is loaded. So
when the "from" commit is the current head of the branch, that make
fast-import do more work than necessary.

Even more so when the pack flush code in gfi_unpack_entry is triggered,
which, on mac, is extra slow (and explains the huge slow down there).

Now, I do understand that my script is doing something stupid. So the
question is whether it's worth fixing in fast-import or not. I already
fixed my script anyways.

Mike
--
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]