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Re: [jgit-dev] [egit-dev] speeding up re-indexing
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Hey All!
Now that the smudged index is fixed - back to the problem ;) (and thanks for the quick help with the smudging thing!)
I tried now to measure some times. When caches are cold (caches dropped) re-indexing takes 5 minutes and a few seconds. A second re-indexing then takes approximately 30 seconds (which is still long!). i see now that there are no smudged index entries anymore, only our 170 empty files ;)
Any more hints? i would really like to get the time down, or minimize the amount of re-indexing runs. any ideas?
Regards,
Markus
On 05/30/2012 07:56 AM, Markus Duft wrote:
> Hey Kevin,
>
> i can now confirm with current master:
>
> i have this as starting point:
>
> A--B
>
> now i create a new branch from A and commit something
>
> --C
> /
> A--B
>
> smudged count changes from ~195 (all empty files) to ~198.
>
> then i rebase C on B
>
> A--B--C'
>
> the smudged count increases to 33994. a more intelligent grep (i counted bin directories mistakingly last time) showed that this is every single file that is tracked... bad?
>
> re-indexing in the ide still does not take notably longer (maybe off by 2-5 seconds), but i suspect that my machine has a super-great filesystem cache (i have a 16-core workstation with 12G ram and fast discs).
>
> Regards,
> Markus
>
> On 05/30/2012 06:47 AM, Kevin Sawicki wrote:
>> It would be good to know if the latest master exhibits the same behavior.
>>
>> Kevin
>>
>> On Tue, May 29, 2012 at 9:41 PM, Markus Duft <markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx>> wrote:
>>
>> master from 2.0.0.201204111131 - would an update to current master help..?
>>
>> On 05/30/2012 06:40 AM, Kevin Sawicki wrote:
>> > What version of EGit/JGit are you currently using?
>> >
>> > On Tue, May 29, 2012 at 9:34 PM, Markus Duft <markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx>>> wrote:
>> >
>> > On 05/30/2012 06:27 AM, Kevin Sawicki wrote:
>> > > Hopefully both fixes will still make it into the 2.0 release next month.
>> >
>> > oh - interesting; i did a fetch and rebase on the repo (just the two straight forward), and it gave me back all 33000 smudged index entries?!
>> >
>> > Markus
>> >
>> > >
>> > > On Tue, May 29, 2012 at 9:24 PM, Markus Duft <markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx>> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx>>>> wrote:
>> > >
>> > > On 05/30/2012 06:22 AM, Kevin Sawicki wrote:
>> > > > Smudged index entries occur when the index is written and the timestamp of the index file is close to the timestamp of the file in the working directory.
>> > > >
>> > > > You can update them by running a git status on the command line.
>> > >
>> > > Thanks for the hint. Sadly i cannot force all my developers to have a command line git, although i recommend it. Still, since we're building our own JGit/EGit versions with some minor workarounds anyway, i may apply one of the two if applicable.
>> > >
>> > > Regards,
>> > > Markus
>> > >
>> > > >
>> > > > You can read more about it here: https://raw.github.com/git/git/master/Documentation/technical/racy-git.txt
>> > > >
>> > > > There are a couple JGit fixes proposed to prevent these from being left in the index:
>> > > >
>> > > > https://git.eclipse.org/r/#/c/6137/
>> > > >
>> > > > https://git.eclipse.org/r/#/c/6138/
>> > > >
>> > > > Just to clarify, there are very valid cases for having smudged index entries. The issue with JGit currently is that they aren't being updated and removed when applicable.
>> > > >
>> > > > Kevin
>> > > >
>> > > > On Tue, May 29, 2012 at 9:16 PM, Markus Duft <markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx>> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx>>> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx>> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx>>>>> wrote:
>> > > >
>> > > > On 05/29/2012 05:20 PM, Kevin Sawicki wrote:
>> > > > > Have you tried checking if your index contains smudged entries?
>> > > >
>> > > > hm. not yet. how can smudged entries occur?
>> > > >
>> > > > >
>> > > > > This will trigger a full SHA-1 redigest each time the indexing occurs.
>> > > >
>> > > > that could explain why it takes so long.
>> > > >
>> > > > >
>> > > > > From the command line: git ls-files --debug -s | grep -B5 "size: 0"
>> > > >
>> > > > "a few" - approximately 33993 smudged entries - what can i do about it?
>> > > >
>> > > > thanks for helping!
>> > > > Markus
>> > > >
>> > > > >
>> > > > > If this command shows any output for files where the SHA-1 is not equal to "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391" then the index entry is smudged.
>> > > > >
>> > > > > Kevin
>> > > > >
>> > > > > On Tue, May 29, 2012 at 8:14 AM, Markus Duft <markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx>> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx>>> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx>> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx>>>> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx>> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx>>> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx>> <mailto:markus.duft@xxxxxxxxxx
>> <mailto:markus.duft@xxxxxxxxxx> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx>>>>>> wrote:
>> > > > >
>> > > > > On 05/29/2012 03:41 PM, Baumgart, Jens wrote:
>> > > > > > I assume there is no "easy" way to speed it up.
>> > > > > > I could imagine JGit giving more details in its events (indexChanged and
>> > > > > > refsChanged). This would allow to avoid complete re-indexing in many cases.
>> > > > > > I am wondering why it's so slow for your repo. Re-indexing takes some
>> > > > > > seconds for big repos like the linux kernel.
>> > > > > > Do you store large binaries in your repo?
>> > > > >
>> > > > > hm, not binaries. we have .xml.zip files (models) that are ~5-10MB in size, but what we also have are .xml files that are ~50MB in size, and not one but a dozen of them. could that matter?
>> > > > >
>> > > > > any chance to find out /what/ takes so long?
>> > > > >
>> > > > > Regards,
>> > > > > Markus
>> > > > >
>> > > > > > --
>> > > > > > Jens
>> > > > > >
>> > > > > > On 29.05.12 15:34, "Markus Duft" <markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx>> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx>>> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx>> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx>>>> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx>> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx>>> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx>> <mailto:markus.duft@xxxxxxxxxx
>> <mailto:markus.duft@xxxxxxxxxx> <mailto:markus.duft@xxxxxxxxxx <mailto:markus.duft@xxxxxxxxxx>>>>>> wrote:
>> > > > > >
>> > > > > >> Hey!
>> > > > > >>
>> > > > > >> is there an "easy" (meaning not weeks of work) way to speed up the
>> > > > > >> re-indexing of repositories? it takes approx. 2 minutes for our repo
>> > > > > >> (~95177 files to scan) on a linux machine with _fast_ discs. Not to speak
>> > > > > >> of our poor windows developers with notebooks (~5-10 minutes!)
>> > > > > >>
>> > > > > >> Regards,
>> > > > > >> Markus
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