[m-rev.] diff: .NET back-end fixes

[Peter Ross]

On Tue, Feb 18, 2003 at 11:04:05AM +1100, Fergus Henderson wrote:
> On 17-Feb-2003, Peter Ross <pro at missioncriticalit.com> wrote:
> > On Sun, Feb 16, 2003 at 10:36:46AM +1100, Fergus Henderson wrote:
> > > Estimated hours taken: 3
> > > Branches: main
> > > 
> > > Various fixes for the .NET back-end.
> > > 
> > > compiler/Mmakefile:
> > > 	For IL grades, use editbin to set the stack size to 100M,
> > > 	since the default (1M) is too small.
> > 
> > A possible problem with this is that you can exhaust VM because each
> > instance of the compiler will reserve 100M in the VM system on windows
> > systems.
> 
> Are you sure this is system-wide rather than per-process?
> 
> There's settings for both "reserve" and "commit".  I've only set the
> "reserve" value, not the "commit" value, so this should only reserve
> address space.  Unless Windows is a much crappier OS than I thought, there
> should be 4G address space *per process*.  A big chunk of this will be
> reserved for the operating system, but there should still be at very
> least 1G left for the user process, and I think more likely 3G.
> Allocating 100M of the address space for the stack still leaves at least
> 900M for code, static data, and heap space, which should be plenty.
> 
> If I had set the commit size, then yes, that might be a problem,
> since then the OS would need to reserve 100M of swap space for
> each invocation of mercury_compile.exe.  But I didn't set the
> commit size, so AFAIK it shouldn't be a problem -- right?
> 
Hmmm, I shouldn't have answered this email from memory.  You are
correct.

The problem that confused myself with can occur when you have such
a large stack size and are writing a threaded program.  You can quite
quickly exhaust the VM then.

Pete
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