Re: debugging parallel make

[David Fang]

> > 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.

Hi Dan,
	Sorry if this comes late, but I haven't been checking this list 
very often.  I often use 'pstree' to see what is running concurrently, 
say, after "make -j".

I recommend the version at http://www.thp.uni-duisburg.de/ftpdoc.html 
(pstree link) over the default linux pstree, which is (IMHO) ugly and 
uninformative.

Unfortunately, this only gives a single snapshot of the process subtree at 
the time of invocation, but it's better than nothing, and sufficient to 
catch long-running tasks.

HTH

Fang

David Fang
Computer Systems Laboratory
Electrical & Computer Engineering
Cornell University
http://www.csl.cornell.edu/~fang/
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