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Re: [Libguestfs] [PATCH for discussion only 0/3] Implement mutexes to limit number of concurrent instances of libguestfs.

On Mon, Feb 18, 2013 at 09:20:42PM +0000, Richard W.M. Jones wrote:
> These three patches (for discussion only, NOT to be applied) implement
> a mutex system that lets the user limit the number of libguestfs
> instances that can be launched per host.  There are two uses that I
> have identified for this: firstly so we can enable parallel-tests (the
> default in automake >= 1.13) without blowing up the host.  Secondly
> oVirt has raised concerns about how to limit the number of libguestfs
> appliances that can run to prevent this from interfering with their
> ordinary guests.

IMHO this whole feature is of dubious worth & overly simplistic. For
automake you can already control parallelization of tests just by
varying the '-jNNN' number.

If oVirt wants to limit the number of appliances it creates, it should
just do so itself. For appliances not directly invoked by ovirt, I don't
see that this is going to help, since you can't rely on the env vars
being set.

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