Re: [RFC/PATCH v2 00/10] Add initial experimental external ODB support

On Wed, Jun 29, 2016 at 10:01 PM, Eric Wong [off-list ref] wrote:

Christian Couder [off-list ref] wrote:

quoted

Design discussion about performance
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Yeah, it is not efficient to fork/exec a command to just read or write
one object to or from the external ODB. Batch calls and/or using a
daemon and/or RPC should be used instead to be able to store regular
objects in an external ODB. But for now the external ODB would be all
about really big files, where the cost of a fork+exec should not
matter much. If we later want to extend usage of external ODBs, yeah
we will probably need to design other mechanisms.

I would also investigate switching run_command to use vfork+exec
or posix_spawn for performance (keeping in mind vfork
caveats documented at https://ewontfix.com/7/ )

Thanks Eric for this idea and the test!