TAU_REGISTER

TAU_REGISTER_CONTEXT

Section: TAU Instrumentation API (3) Updated: 08/31/2005 Local index Up

NAME

TAU_REGISTER_CONTEXT_EVENT - Registers a context event

SYNOPSIS

C/C++:

TAU_REGISTER_CONTEXT_EVENT(TauUserEvent variable, char *event_name);

Fortran:

TAU_REGISTER_CONTEXT_EVENT(int variable(2), character event_name(size));

DESCRIPTION

Creates a context event with name. A context event appends the names of routines executing on the callstack to the name specified by the user. Whenver a context event is triggered, the callstack is examined to determine the context of execution. Starting from the parent function where the event is triggered, TAU walks up the callstack to a depth specified by the user in the environment variable TAU_CALLPATH_DEPTH. If this environment variable is not specified, TAU uses 2 as the default depth. For e.g., if the user registers a context event with the name "memory used" and specifies 3 as the callpath depth, and if the event is triggered in two locations (in routine a, when it was called by b, when it was called by c, and in routine h, when it was called by g, when it was called by i), then, we'd see the user defined event information for "memory used: c() => b() => a()" and "memory used: i() => g() => h()".

EXAMPLE

C/C++ :

int f2(void)
{
  static int count = 0;
  count ++;
  TAU_PROFILE("f2()", "(sleeps 2 sec, calls f3)", TAU_USER);
  TAU_REGISTER_CONTEXT_EVENT(event, "Iteration count");
/*
  if (count == 2)
    TAU_DISABLE_CONTEXT_EVENT(event);
*/
  printf("Inside f2: sleeps 2 sec, calls f3\n");

  TAU_CONTEXT_EVENT(event, 232+count);
  sleep(2);
  f3();
  return 0;
}

Fortran :

subroutine foo(id)
  integer id
       
  integer profiler(2) / 0, 0 /
  integer maev(2) / 0, 0 /
  integer mdev(2) / 0, 0 /
  save profiler, maev, mdev

  integer :: ierr
  integer :: h, t, u
  INTEGER, ALLOCATABLE :: STORAGEARY(:)
  DOUBLEPRECISION   edata

  call TAU_PROFILE_TIMER(profiler, 'FOO')
  call TAU_PROFILE_START(profiler)
  call TAU_PROFILE_SET_NODE(0)

  call TAU_REGISTER_CONTEXT_EVENT(maev, "STORAGEARY Alloc [cubes.f:20]")
  call TAU_REGISTER_CONTEXT_EVENT(mdev, "STORAGEARY Dealloc [cubes.f:37]")

  allocate(STORAGEARY(1:999), STAT=IERR)
  edata = SIZE(STORAGEARY)*sizeof(INTEGER)
  call TAU_CONTEXT_EVENT(maev, edata)
  ...
  deallocate(STORAGEARY)
  edata = SIZE(STORAGEARY)*sizeof(INTEGER)
  call TAU_CONTEXT_EVENT(mdev, edata)
  call TAU_PROFILE_STOP(profiler)
  end subroutine foo