Re: Multiple cvs/git mirror tasks?

[Jason Merrill <jason@redhat.com>]

On 07/20/2012 12:19 PM, Jim Meyering wrote:
> At first glance, you may think there are three invocations of the script,
> but as recently discussed here, that's merely due to a subshelled
> pipeline in the script: each element of the pipeline ends up looking
> (in ps output) like another invocation of the parent script.  It really
> was invoked only once.

Right, but in the ps output I sent before, there were two gdb runs (each 
with 3 processes) running at the same time.

> I'm leery about adding naive cross-project locks, because that could
> let a busy project starve one that needs only a tiny update.
>
> Using lockfile(1) and a timeout might help.
>
> I could add a per-project locking mechanism to prevent e.g., two gdb
> syncs from running in parallel when the first one takes more than the
> 30m between cron invocations.  That could save some system resources,
> but would not improve correctness or integrity.

That makes sense to me.  The times when it would run long are likely to 
correspond with times when system resources are tightest, as with the 
time I noticed.

Jason