was profiling broken in 110.63.1?

Dear SML/NJ gurus,

If I enter

  Backend.Profile.setProfMode true;
  let fun f 0 = () | f n = f (n - 1)
  in f 100;
     Backend.Profile.reportAll TextIO.stdOut
  end;

into SML/NJ 110.54, the profiling output I get looks like this:

 %time cumsec #call  name
          .00   101  it.f.f
          .00     0  Compilation
          .00     0  Major GC
          .00     0  Minor GC
          .00     0  Other
          .00     0  Run-time System

I have not turned on timing mode, so the times are all zero, but the
count of the number of calls to f is correct.

In contrast, if I enter the same code in to SML/NJ 110.70, the
profiling output I get looks like this:

 %time cumsec #call  name
          .00     0  Compilation
          .00     0  Major GC
          .00     0  Minor GC
          .00     0  Other
          .00     0  Run-time System

Notice that the profiler has not recorded any calls to the function f.

In fact, it seems that the table used by the profiler (as retrieved
using SMLofNJ.Internals.ProfControl.getTimeArray) does not change at
all when f is compiled in SML/NJ 110.70, whereas the table can be
observed to get bigger in 110.54.

My student Vincent Rahli has tried the profiler on many versions of
SML/NJ and he reports to me that the failures start in version
110.63.1 (which was released two and half years ago).

Has there been a change in how the profiler is supposed to be used?
Is there some additional switch that needs to be adjusted
post-110.63.1 to turn on the instrumentation of compiled code with
profiling calls?  Or is this just a bug?

It would be really, really, really helpful if we did not have to
switch back to using 110.63 in order to get profiling.

Any help with this issue would be much appreciated!

-- 
Thanks,

Joe


-- 
Heriot-Watt University is a Scottish charity
registered under charity number SC000278.


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