docs: update Windows installation documentation for Windows 7/Server 2008 R2 and newer Update to the Windows installation documentation following my setup experience on our production server. Changes : * Use of Microsoft Visual C++ Compiler for Python 2.7 which simplifies matter versus installing Visual Studio 2008 Express, because it removes the need to use the Visual Studio 2008 command prompt. It is also a lot smaller to download and install. Unfortunately, this means the instruction will only work on the same platforms as those which are supported by the compiler. * For that reason, I split the documentation into newer and older Windows. * Added more explanations where I feel it was necessary based on my experience * Added explanation on Git (Warning : I did not try this part) * Instructions assumes x64 instead of Win32. * Clarified titles * Grammar Potential issues: * I have the user install pip system wide so that virtualenv installation is easier (especially if using Python 2.7.9 which already includes pip). One may prefer to install virtualenv and the pip in the virtual environment (I know of no good reason, but it could happen). * Removed some line feeds that I found useless. I do not know the .rst format, they might be needed. It makes no difference when the documentation is generated using make.bat, so I am not sure Potential improvements: * Instructions on using srvany.exe to install as a Windows service * Instructions to make a reverse proxy using Apache * Instructions to make a reverse proxy using IIS

.. _statistics:

==========
Statistics
==========

The Kallithea statistics system makes heavy demands of the server resources, so
in order to keep a balance between usability and performance, the statistics are
cached inside db and are gathered incrementally, this is how Kallithea does
this:

With Celery disabled
--------------------

- On each first visit to the summary page a set of 250 commits are parsed and
  updates statistics cache.
- This happens on each single visit to the statistics page until all commits are
  fetched. Statistics are kept cached until additional commits are added to the
  repository. In such a case Kallithea will only fetch the new commits when
  updating it's cache.


With Celery enabled
-------------------

- On the first visit to the summary page Kallithea will create tasks that will
  execute on celery workers. This task will gather all of the stats until all
  commits are parsed, each task will parse 250 commits, and run the next task to
  parse next 250 commits, until all of the commits are parsed.

.. note::
   At any time you can disable statistics on each repository via the repository
   edit form in the admin panel. To do this just uncheck the statistics checkbox.