[m-dev.] Proposing a new grade component.

[Paul Bone]

On Thu, Nov 10, 2011 at 12:41:25PM +1100, Paul Bone wrote:
> On Tue, Nov 08, 2011 at 02:16:59PM +1100, Julien Fischer wrote:
> > 
> > Given that it may have changed then I suggest you measure it again.
> >
> 
> EXTRA_MCFLAGS = 
> GRADE = asm_fast.gc
> mercury_compile.01 average of 5 with ignore=1     14.10
> 
> EXTRA_MCFLAGS = 
> GRADE = asm_fast.gc.profdeep
> mercury_compile.03 average of 5 with ignore=1     75.55
> 
> EXTRA_MCFLAGS = --coverage-profiling
> GRADE = asm_fast.gc.profdeep
> mercury_compile.05 average of 5 with ignore=1     82.69
> 
> Note that none of these tests use --profile-optimized.
> 
> Test            | Time sec  | Slowdown      | Slowdown compared to dp
> ----------------+-----------=---------------+-------------------------
> asm_fast.gc     |  14.10    | 1.00          | 5.36
> dp              |  75.55    | 0.19          | 1.00
> dp + coverage   |  82.69    | 0.17          | 0.91
> 
> Coverage profiling is about 9% slower than normal deep profiling.
> Deep profiling is about 81% slower than normal execution,
> and coverage profiling is about 83% slower than normal execution.
> 
> I'm going to do another test, I want to see what it's like when I compile the
> library with profile optimized and compile the application (in this case mmc)
> without profile optimized.
> 

With profile-optimized:

dp:            50.7s
dp + coverage: 53.05s

These are both much faster than before, and the gap between them has also
narrowed.

The net result of the proposed changes will actually be a faster deep profiling
grade.  To re-iterate, we propose to enable coverage profiling by default, and
to enable --profile-optimized for the standard library.


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