Thomas Rast wrote:

quoted text
> Andreas Ericsson wrote:

>> Nicolas Pitre wrote:

>>> |nico@xanadu:linux-2.6> time git rev-list --objects --all > /dev/null

>>> |

>>> |real    0m21.742s

>>> |user    0m21.379s

>>> |sys     0m0.360s

>>>

>>> That's way too long for 1030198 objects (roughly 48k objects/sec).  And

>>> it gets even worse with the gcc repository:

>>>

>>> |nico@xanadu:gcc> time git rev-list --objects --all > /dev/null

>>> |

>>> |real    1m51.591s

>>> |user    1m50.757s

>>> |sys     0m0.810s

>>>

>>> That's for 1267993 objects, or about 11400 objects/sec.

>>>

>>> Clearly something is not scaling here.

>>>

>> What are the different packing options for the two repositories?

>> A longer deltachain and larger packwindow would increase the

>> enumeration time, wouldn't it?

>

> For the fun of it, I ran a test without deltas.  Here's my normal

> git.git:

>

>   $ du -h .git/objects/pack

>   26M     .git/objects/pack

>   $ git rev-list --all | wc -l

>   17638

>   $ git rev-list --all --objects | wc -l

>   82194

>

> On a hot cache I get about 61800 objects/sec:

>

>   $ /usr/bin/time git rev-list --all --objects >/dev/null

>   1.33user 0.04system 0:01.39elapsed 98%CPU (0avgtext+0avgdata 0maxresident)k

>   0inputs+0outputs (0major+8087minor)pagefaults 0swaps

>

> I then made a copy of that and repacked it without deltas (remember to

> remove *.keep, I tripped over that twice):

>

>   $ git repack --depth=0 --window=0 -a -f -d

>   Counting objects: 82906, done.

>   Writing objects: 100% (82906/82906), done.

>   Total 82906 (delta 0), reused 0 (delta 0)

>   $ du -h .git/objects/pack

>   339M    .git/objects/pack

>

> Which results in only 28739 objects/sec:

> 

Well, if the objects are, on average, >twice the size, would that

explain it? I'd hate to see some of the sharper git minds hop off

on a wild goose chase if it's not necessary.
How does one go about getting the object sizes? rev-list appears

to have no option for it.
--

Andreas Ericsson                   andreas.ericsson@op5.se

OP5 AB                             www.op5.se

Tel: +46 8-230225                  Fax: +46 8-230231

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