Re: gitweb index performance (Re: [PATCH] gitweb: support the rel=vcs-* microformat)

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"J.H." <warthog19@xxxxxxxxxxxxxx> writes:
> Joey Hess wrote:
>> Giuseppe Bilotta wrote:
>>
>>>> There is a small overhead in including the microformat on project list
>>>> and forks list pages, but getting the project descriptions for those pages
>>>> already incurs a similar overhead, and the ability to get every repo url
>>>> in one place seems worthwhile.
>>>>
>>> I agree with this, although people with very large project lists may
>>> differ ... do we have timings on these?
>>>
>>
>> AFAICS, when displaying the project list, gitweb reads each project's
>> description file, falling back to reading its config file if there is no
>> description file.
>>
>> If performance was a problem here, the thing to do would be to add
>> project descriptions to the $project_list file, and use those in
>> preference to the description files. If a large site has done that,
>> they've not sent in the patch. :-)
> 
> No because all the large sites have pain points and issues elsewhere
> in the app.  Most of the large sites (which I can at least speak for
> Kernel.org) went and have built in full caching layers into gitweb
> itself to deal with the problem.  This means that we don't have to
> worry about nickle and dime performance improvements that are specific
> to one section, but can do a very broad sweep and get dramatically
> better performance across all of gitweb.  Those patches have all made
> it back out onto the mailing list, but for a number of different
> reasons none have been accepted into the mainline branch.

Additional issue is that when you add or delete repository (project),
you have to correct or regenerate projects_index file.  While it is I
think quite easy for git hosting sites such as repo.or.cz, it is
harder for sites which offer gitweb just like they ofer WWW homepages:
as a service, with repositories created (and descriptions updated)
outside of gitweb control.

-- 
Jakub Narebski
Poland
ShadeHawk on #git
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