Re: debugging parallel make

[Dan McMahill]

Dan McMahill wrote:
> Paul Smith wrote:
> > On Sun, 2008-01-06 at 02:05 -0500, Dan McMahill wrote:
> > > I'm looking for something along the lines of
> > >
> > > [slot1] cc -c file1.c
> > > [slot2] cc -c file2.c
> > > [slot2] cc -c file3.c
> > > [slot1] cc -c file4.c
> > >
> > > where the [slot1] and [slot2] indicate which job slot is being fed a 
> > > command.
> >
> > You can't, because make doesn't keep a list of slots like this.  You can
> > read more details about how the jobserver works on my website below, but
> > in short make reads a single character token from a pipe and when it
> > gets one, that allows make to run a job.  All the tokens look exactly
> > the same so there's no way for make to know which slot is being used.
>
> so is there any other way to figure out what commands are being run at 
> the same time vs. sequentially?

i suppose if I could somehow get out a dependency graph I may be able to 
visually pick out where my bug is.

Part of the problem I'm faced with is I have some of my own rules but 
also a whole bunch of automake rules and I can't claim I fully 
understand all of the implied dependencies.

Thanks
-Dan