Re: [gomp4.1] fix more scheduling inconsistencies and add verification routines

[Jakub Jelinek <jakub@redhat.com>]

On Fri, Oct 09, 2015 at 09:38:40AM -0700, Aldy Hernandez wrote:
> As per our IRC discussion.
> 
> I am conditionally compiling the verification code because you mentioned
> that the GPGPUs may not having a working printf.

Both that and code size being important there.

> Also, I removed the code caching the workgroup since it may contain the
> incorrect workgroup as I had suggested.  Now instead we look in
> child_task->taskgroup which will have the correct workgroup always.
> 
> Tested on x86-64 Linux with make check-target-libgomp for a variety of
> different OMP_NUM_THREADS and with _ENABLE_LIBGOMP_CHECKING_ set to 1.
> 
> OK for branch?

Yes, with a small change (just compile test with
-D_ENABLE_LIBGOMP_CHECKING_=1, no need to retest otherwise):

> p.s. As a thought, maybe we can set _ENABLE_LIBGOMP_CHECKING_ to 1 until
> release?

I'd prefer not to, it will affect the timing and slow down already slow
testing of libgomp for everybody.

> --- a/libgomp/task.c
> +++ b/libgomp/task.c
> @@ -27,6 +27,7 @@
>     creation and termination.  */
>  
>  #include "libgomp.h"
> +#include <stdio.h>

Please nuke the above.

> +  if (task->parent != parent)
> +    {
> +      fprintf (stderr, "verify_children_queue: incompatible parents\n");
> +      abort ();
> +    }

and just use
  if (task->parent != parent)
    gomp_fatal ("verify_children_queue: incompatible parents");
instead.  Note no \n at the end.
Ditto for all other fprintf + abort pairs.
gomp_fatal accepts printf style formatting string, so you can even
handle it in:

> +      fprintf (stderr, "verify_taskgroup_queue: incompatible taskgroups\n");
> +      fprintf (stderr, "%p %p\n", task->taskgroup, taskgroup);
> +      abort ();

this case, just use a single fmt string, and just use space instead of \n in
the middle.

	Jakub