Re: Threading the compiler

[Marcin Dalecki <martin at dalecki dot de>]

On 2006-11-10, at 22:33, Sohail Somani wrote:

> On Fri, 2006-11-10 at 12:46 -0800, H. J. Lu wrote:
> > On Fri, Nov 10, 2006 at 12:38:07PM -0800, Mike Stump wrote:
> > > How many hunks do we need, well, today I want 8 for 4.2 and 16 for
> > > mainline, each release, just 2x more.  I'm assuming nice, equal  
> > > sized
> > > hunks.  For larger variations in hunk size, I'd need even more  
> > > hunks.
> > >
> > > Or, so that is just an off the cuff proposal to get the discussion
> > > started.
> > >
> > > Thoughts?
> >
> > Will use C++ help or hurt compiler parallelism? Does it really  
> > matter?
>
> My 2c.
>
> I don't think it can possibly hurt as long as people follow normal C++
> coding rules.

Contrary to C there is no single general coding style for C++. In  
fact for a project
of such a scale this may be indeed the most significant deployment  
problem for C++.

> Lots of threads communicating a lot would be bad.

This simply itsn't true. The compiler would be fine having many  
threads handling a
lot of data between them in a pipelined way. In fact it already does  
just that,
however without using the opportunity for paralell execution.

Marcin Dalecki