[Openmp-commits] [openmp] r336085 - [OMPT] Provide the right thread_num for ancestor levels
Joachim Protze via Openmp-commits
openmp-commits at lists.llvm.org
Mon Jul 2 02:13:24 PDT 2018
Author: jprotze
Date: Mon Jul 2 02:13:24 2018
New Revision: 336085
URL: http://llvm.org/viewvc/llvm-project?rev=336085&view=rev
Log:
[OMPT] Provide the right thread_num for ancestor levels
The current implementation always provides the thread-num for the current
parallel region. This patch fixes the behavior for ancestor levels >0.
Differential Revision: https://reviews.llvm.org/D46533
Added:
openmp/trunk/runtime/test/ompt/parallel/nested_thread_num.c
Modified:
openmp/trunk/runtime/src/ompt-specific.cpp
Modified: openmp/trunk/runtime/src/ompt-specific.cpp
URL: http://llvm.org/viewvc/llvm-project/openmp/trunk/runtime/src/ompt-specific.cpp?rev=336085&r1=336084&r2=336085&view=diff
==============================================================================
--- openmp/trunk/runtime/src/ompt-specific.cpp (original)
+++ openmp/trunk/runtime/src/ompt-specific.cpp Mon Jul 2 02:13:24 2018
@@ -341,18 +341,23 @@ int __ompt_get_task_info_internal(int an
ompt_task_info_t *info = NULL;
ompt_team_info_t *team_info = NULL;
kmp_info_t *thr = ompt_get_thread();
+ int level = ancestor_level;
if (thr) {
kmp_taskdata_t *taskdata = thr->th.th_current_task;
if (taskdata == NULL)
return 0;
- kmp_team *team = thr->th.th_team;
+ kmp_team *team = thr->th.th_team, *prev_team = NULL;
if (team == NULL)
return 0;
ompt_lw_taskteam_t *lwt = NULL,
- *next_lwt = LWT_FROM_TEAM(taskdata->td_team);
+ *next_lwt = LWT_FROM_TEAM(taskdata->td_team),
+ *prev_lwt = NULL;
while (ancestor_level > 0) {
+ // needed for thread_num
+ prev_team = team;
+ prev_lwt = lwt;
// next lightweight team (if any)
if (lwt)
lwt = lwt->parent;
@@ -410,7 +415,13 @@ int __ompt_get_task_info_internal(int an
*parallel_data = team_info ? &(team_info->parallel_data) : NULL;
}
if (thread_num) {
- *thread_num = __kmp_get_gtid();
+ if (level == 0)
+ *thread_num = __kmp_get_tid();
+ else if (prev_lwt)
+ *thread_num = 0;
+ else
+ *thread_num = prev_team->t.t_master_tid;
+ // *thread_num = team->t.t_master_tid;
}
return info ? 2 : 0;
}
Added: openmp/trunk/runtime/test/ompt/parallel/nested_thread_num.c
URL: http://llvm.org/viewvc/llvm-project/openmp/trunk/runtime/test/ompt/parallel/nested_thread_num.c?rev=336085&view=auto
==============================================================================
--- openmp/trunk/runtime/test/ompt/parallel/nested_thread_num.c (added)
+++ openmp/trunk/runtime/test/ompt/parallel/nested_thread_num.c Mon Jul 2 02:13:24 2018
@@ -0,0 +1,357 @@
+// RUN: %libomp-compile-and-run | FileCheck %s
+// RUN: %libomp-compile-and-run | %sort-threads | FileCheck --check-prefix=THREADS %s
+// REQUIRES: ompt
+// UNSUPPORTE: gcc-4, gcc-5, gcc-6, gcc-7
+#define TEST_NEED_PRINT_FRAME_FROM_OUTLINED_FN
+#include "callback.h"
+#include <omp.h>
+#include <unistd.h>
+
+int main() {
+ int condition = 0;
+ omp_set_nested(1);
+ print_frame(0);
+
+#pragma omp parallel num_threads(2)
+ {
+ print_frame_from_outlined_fn(1);
+ print_ids(0);
+ print_ids(1);
+ print_frame(0);
+
+// get all implicit task events before starting nested:
+#pragma omp barrier
+
+#pragma omp parallel num_threads(2)
+ {
+ print_frame_from_outlined_fn(1);
+ print_ids(0);
+ print_ids(1);
+ print_ids(2);
+ print_frame(0);
+ OMPT_SIGNAL(condition);
+ OMPT_WAIT(condition, 4);
+#pragma omp barrier
+ print_fuzzy_address(1);
+ print_ids(0);
+ }
+ print_fuzzy_address(2);
+ print_ids(0);
+ }
+ print_fuzzy_address(3);
+
+ return 0;
+}
+// Check if libomp supports the callbacks for this test.
+// CHECK-NOT: {{^}}0: Could not register callback
+
+// CHECK: 0: NULL_POINTER=[[NULL:.*$]]
+
+// make sure initial data pointers are null
+// CHECK-NOT: 0: parallel_data initially not null
+// CHECK-NOT: 0: task_data initially not null
+// CHECK-NOT: 0: thread_data initially not null
+
+// CHECK: {{^}}[[MASTER_ID:[0-9]+]]: ompt_event_parallel_begin:
+// CHECK-SAME: parent_task_id=[[PARENT_TASK_ID:[0-9]+]],
+// CHECK-SAME: parent_task_frame.exit=[[NULL]],
+// CHECK-SAME: parent_task_frame.reenter={{0x[0-f]+}},
+// CHECK-SAME: parallel_id=[[PARALLEL_ID:[0-9]+]],
+// CHECK-SAME: requested_team_size=2,
+// CHECK-SAME: codeptr_ra=[[RETURN_ADDRESS:0x[0-f]+]]{{[0-f][0-f]}},
+// CHECK-SAME: invoker=[[PARALLEL_INVOKER:[0-9]+]]
+
+// CHECK-DAG: {{^}}[[MASTER_ID]]: ompt_event_implicit_task_begin:
+// CHECK-DAG: {{^}}[[MASTER_ID]]: ompt_event_implicit_task_end:
+
+// Note that we cannot ensure that the worker threads have already called
+// barrier_end and implicit_task_end before parallel_end!
+
+// CHECK-DAG: {{^}}[[THREAD_ID:[0-9]+]]: ompt_event_implicit_task_begin:
+// CHECK-DAG: {{^}}[[THREAD_ID]]: ompt_event_barrier_begin:
+
+
+// CHECK: ompt_event_parallel_end: parallel_id=[[PARALLEL_ID]],
+// CHECK-SAME: task_id=[[PARENT_TASK_ID]], invoker=[[PARALLEL_INVOKER]]
+// CHECK: {{^}}[[MASTER_ID]]: fuzzy_address={{.*}}[[RETURN_ADDRESS]]
+
+// THREADS: {{^}}0: NULL_POINTER=[[NULL:.*$]]
+// THREADS: __builtin_frame_address(0)=[[MAIN_REENTER:0x[0-f]+]]
+// THREADS: {{^}}[[MASTER_ID:[0-9]+]]: ompt_event_parallel_begin:
+// THREADS-SAME: parent_task_id=[[PARENT_TASK_ID:[0-9]+]],
+// THREADS-SAME: parent_task_frame.exit=[[NULL]],
+// THREADS-SAME: parent_task_frame.reenter=[[MAIN_REENTER]],
+// THREADS-SAME: parallel_id=[[PARALLEL_ID:[0-9]+]], requested_team_size=2,
+// THREADS-SAME: codeptr_ra=[[RETURN_ADDRESS:0x[0-f]+]]{{[0-f][0-f]}},
+// THREADS-SAME: invoker=[[PARALLEL_INVOKER:[0-9]+]]
+
+// nested parallel masters
+// THREADS: {{^}}[[MASTER_ID]]: ompt_event_implicit_task_begin:
+// THREADS-SAME: parallel_id=[[PARALLEL_ID]],
+// THREADS-SAME: task_id=[[IMPLICIT_TASK_ID:[0-9]+]],
+// THREADS-SAME: team_size=2, thread_num=0
+
+// THREADS: __builtin_frame_address({{.}})=[[EXIT:0x[0-f]+]]
+
+// THREADS: {{^}}[[MASTER_ID]]: task level 0: parallel_id=[[PARALLEL_ID]],
+// THREADS-SAME: task_id=[[IMPLICIT_TASK_ID]], exit_frame=[[EXIT]],
+// THREADS-SAME: reenter_frame=[[NULL]],
+// THREADS-SAME: thread_num=0
+
+// THREADS: {{^}}[[MASTER_ID]]: task level 1:
+// THREADS-SAME: parallel_id=[[IMPLICIT_PARALLEL_ID:[0-9]+]],
+// THREADS-SAME: task_id=[[PARENT_TASK_ID]], exit_frame=[[NULL]],
+// THREADS-SAME: reenter_frame=[[MAIN_REENTER]]
+
+// THREADS: __builtin_frame_address(0)=[[REENTER:0x[0-f]+]]
+
+// THREADS: {{^}}[[MASTER_ID]]: ompt_event_parallel_begin:
+// THREADS-SAME: parent_task_id=[[IMPLICIT_TASK_ID]],
+// THREADS-SAME: parent_task_frame.exit=[[EXIT]],
+// THREADS-SAME: parent_task_frame.reenter=[[REENTER]],
+// THREADS-SAME: parallel_id=[[NESTED_PARALLEL_ID:[0-9]+]],
+// THREADS-SAME: requested_team_size=2,
+// THREADS-SAME: codeptr_ra=[[NESTED_RETURN_ADDRESS:0x[0-f]+]]{{[0-f][0-f]}},
+// THREADS-SAME: invoker=[[PARALLEL_INVOKER]]
+
+// THREADS: {{^}}[[MASTER_ID]]: ompt_event_implicit_task_begin:
+// THREADS-SAME: parallel_id=[[NESTED_PARALLEL_ID]],
+// THREADS-SAME: task_id=[[NESTED_IMPLICIT_TASK_ID:[0-9]+]], team_size=2,
+// THREADS-SAME: thread_num=0
+
+// THREADS: __builtin_frame_address({{.}})=[[NESTED_EXIT:0x[0-f]+]]
+
+// THREADS: {{^}}[[MASTER_ID]]: task level 0:
+// THREADS-SAME: parallel_id=[[NESTED_PARALLEL_ID]],
+// THREADS-SAME: task_id=[[NESTED_IMPLICIT_TASK_ID]],
+// THREADS-SAME: exit_frame=[[NESTED_EXIT]], reenter_frame=[[NULL]],
+// THREADS-SAME: thread_num=0
+
+// THREADS: {{^}}[[MASTER_ID]]: task level 1: parallel_id=[[PARALLEL_ID]],
+// THREADS-SAME: task_id=[[IMPLICIT_TASK_ID]], exit_frame=[[EXIT]],
+// THREADS-SAME: reenter_frame=[[REENTER]]
+
+// THREADS: {{^}}[[MASTER_ID]]: task level 2:
+// THREADS-SAME: parallel_id=[[IMPLICIT_PARALLEL_ID]],
+// THREADS-SAME: task_id=[[PARENT_TASK_ID]], exit_frame=[[NULL]],
+// THREADS-SAME: reenter_frame=[[MAIN_REENTER]]
+
+// THREADS: __builtin_frame_address(0)=[[NESTED_REENTER:0x[0-f]+]]
+
+// THREADS-NOT: {{^}}[[MASTER_ID]]: ompt_event_implicit_task_end
+// explicit barrier
+
+// THREADS: {{^}}[[MASTER_ID]]: ompt_event_barrier_begin:
+// THREADS-SAME: parallel_id=[[NESTED_PARALLEL_ID]],
+// THREADS-SAME: task_id=[[NESTED_IMPLICIT_TASK_ID]],
+// THREADS-SAME: codeptr_ra=[[BARRIER_RETURN_ADDRESS:0x[0-f]+]]{{[0-f][0-f]}}
+
+// THREADS: {{^}}[[MASTER_ID]]: task level 0:
+// THREADS-SAME: parallel_id=[[NESTED_PARALLEL_ID]],
+// THREADS-SAME: task_id=[[NESTED_IMPLICIT_TASK_ID]],
+// THREADS-SAME: exit_frame=[[NESTED_EXIT]], reenter_frame=[[NESTED_REENTER]]
+
+// THREADS: {{^}}[[MASTER_ID]]: ompt_event_barrier_end:
+// THREADS-SAME: parallel_id=[[NESTED_PARALLEL_ID]],
+// THREADS-SAME: task_id=[[NESTED_IMPLICIT_TASK_ID]]
+
+// THREADS: {{^}}[[MASTER_ID]]: fuzzy_address={{.*}}[[BARRIER_RETURN_ADDRESS]]
+
+// THREADS: {{^}}[[MASTER_ID]]: task level 0:
+// THREADS-SAME: parallel_id=[[NESTED_PARALLEL_ID]],
+// THREADS-SAME: task_id=[[NESTED_IMPLICIT_TASK_ID]],
+// THREADS-SAME: exit_frame=[[NESTED_EXIT]], reenter_frame=[[NULL]]
+
+// implicit barrier
+// THREADS: {{^}}[[MASTER_ID]]: ompt_event_barrier_begin:
+// THREADS-SAME: parallel_id=[[NESTED_PARALLEL_ID]],
+// THREADS-SAME: task_id=[[NESTED_IMPLICIT_TASK_ID]],
+// THREADS-SAME: codeptr_ra=[[NESTED_RETURN_ADDRESS]]{{[0-f][0-f]}}
+
+// THREADS: {{^}}[[MASTER_ID]]: task level 0:
+// THREADS-SAME: parallel_id=[[NESTED_PARALLEL_ID]],
+// THREADS-SAME: task_id=[[NESTED_IMPLICIT_TASK_ID]],
+// THREADS-SAME: exit_frame=[[NULL]], reenter_frame=[[NULL]]
+
+// THREADS: {{^}}[[MASTER_ID]]: ompt_event_barrier_end:
+// THREADS-SAME: parallel_id={{[0-9]+}}, task_id=[[NESTED_IMPLICIT_TASK_ID]],
+// THREADS-SAME: codeptr_ra=[[NESTED_RETURN_ADDRESS]]{{[0-f][0-f]}}
+
+// THREADS: {{^}}[[MASTER_ID]]: ompt_event_implicit_task_end:
+// THREADS-SAME: parallel_id={{[0-9]+}}, task_id=[[NESTED_IMPLICIT_TASK_ID]]
+
+// THREADS: {{^}}[[MASTER_ID]]: ompt_event_parallel_end:
+// THREADS-SAME: parallel_id=[[NESTED_PARALLEL_ID]],
+// THREADS-SAME: task_id=[[IMPLICIT_TASK_ID]],
+// THREADS-SAME: invoker=[[PARALLEL_INVOKER]],
+// THREADS-SAME: codeptr_ra=[[NESTED_RETURN_ADDRESS]]{{[0-f][0-f]}}
+
+// THREADS: {{^}}[[MASTER_ID]]: fuzzy_address={{.*}}[[NESTED_RETURN_ADDRESS]]
+
+// THREADS-NOT: {{^}}[[MASTER_ID]]: ompt_event_implicit_task_end
+
+// THREADS: {{^}}[[MASTER_ID]]: task level 0: parallel_id=[[PARALLEL_ID]],
+// THREADS-SAME: task_id=[[IMPLICIT_TASK_ID]], exit_frame=[[EXIT]],
+// THREADS-SAME: reenter_frame=[[NULL]]
+
+// implicit barrier
+// THREADS: {{^}}[[MASTER_ID]]: ompt_event_barrier_begin:
+// THREADS-SAME: parallel_id=[[PARALLEL_ID]], task_id=[[IMPLICIT_TASK_ID]],
+// THREADS-SAME: codeptr_ra=[[RETURN_ADDRESS]]{{[0-f][0-f]}}
+
+// THREADS: {{^}}[[MASTER_ID]]: task level 0: parallel_id=[[PARALLEL_ID]],
+// THREADS-SAME: task_id=[[IMPLICIT_TASK_ID]], exit_frame=[[NULL]],
+// THREADS-SAME: reenter_frame=[[NULL]]
+
+// THREADS: {{^}}[[MASTER_ID]]: ompt_event_barrier_end:
+// THREADS-SAME: parallel_id={{[0-9]+}}, task_id=[[IMPLICIT_TASK_ID]],
+// THREADS-SAME: codeptr_ra=[[RETURN_ADDRESS]]{{[0-f][0-f]}}
+
+// THREADS: {{^}}[[MASTER_ID]]: ompt_event_implicit_task_end:
+// THREADS-SAME: parallel_id={{[0-9]+}}, task_id=[[IMPLICIT_TASK_ID]]
+
+// THREADS: {{^}}[[MASTER_ID]]: ompt_event_parallel_end:
+// THREADS-SAME: parallel_id=[[PARALLEL_ID]], task_id=[[PARENT_TASK_ID]],
+// THREADS-SAME: invoker=[[PARALLEL_INVOKER]],
+// THREADS-SAME: codeptr_ra=[[RETURN_ADDRESS]]{{[0-f][0-f]}}
+
+// THREADS: {{^}}[[MASTER_ID]]: fuzzy_address={{.*}}[[RETURN_ADDRESS]]
+
+// Worker of first nesting level
+
+// THREADS: {{^}}[[THREAD_ID:[0-9]+]]: ompt_event_implicit_task_begin:
+// THREADS-SAME: parallel_id=[[PARALLEL_ID]],
+// THREADS-SAME: task_id=[[IMPLICIT_TASK_ID:[0-9]+]], team_size=2,
+// THREADS-SAME: thread_num=[[OUTER_THREADNUM:[0-9]+]]
+
+// THREADS: {{^}}[[THREAD_ID]]: task level 0: parallel_id=[[PARALLEL_ID]],
+// THREADS-SAME: task_id=[[IMPLICIT_TASK_ID]],
+// THREADS-SAME: thread_num=[[OUTER_THREADNUM]]
+
+// THREADS: {{^}}[[THREAD_ID]]: task level 1:
+// THREADS-SAME: parallel_id=[[IMPLICIT_PARALLEL_ID]],
+// THREADS-SAME: task_id=[[PARENT_TASK_ID]]
+
+// THREADS: {{^}}[[THREAD_ID]]: ompt_event_parallel_begin:
+// THREADS-SAME: parent_task_id=[[IMPLICIT_TASK_ID]],
+// THREADS-SAME: parent_task_frame.exit={{0x[0-f]+}},
+// THREADS-SAME: parent_task_frame.reenter={{0x[0-f]+}},
+// THREADS-SAME: parallel_id=[[NESTED_PARALLEL_ID:[0-9]+]], requested_team_size=2,
+// THREADS-SAME: codeptr_ra=[[NESTED_RETURN_ADDRESS]]{{[0-f][0-f]}},
+// THREADS-SAME: invoker=[[PARALLEL_INVOKER]]
+
+// THREADS: {{^}}[[THREAD_ID]]: ompt_event_implicit_task_begin:
+// THREADS-SAME: parallel_id=[[NESTED_PARALLEL_ID]],
+// THREADS-SAME: task_id=[[NESTED_IMPLICIT_TASK_ID:[0-9]+]], team_size=2,
+// THREADS-SAME: thread_num=[[INNER_THREADNUM:[0-9]+]]
+
+// THREADS: {{^}}[[THREAD_ID]]: task level 0:
+// THREADS-SAME: parallel_id=[[NESTED_PARALLEL_ID]],
+// THREADS-SAME: task_id=[[NESTED_IMPLICIT_TASK_ID]],
+// THREADS-SAME: thread_num=[[INNER_THREADNUM]]
+
+// THREADS: {{^}}[[THREAD_ID]]: task level 1: parallel_id=[[PARALLEL_ID]],
+// THREADS-SAME: task_id=[[IMPLICIT_TASK_ID]],
+// THREADS-SAME: thread_num=[[OUTER_THREADNUM]]
+
+// THREADS: {{^}}[[THREAD_ID]]: task level 2:
+// THREADS-SAME: parallel_id=[[IMPLICIT_PARALLEL_ID]],
+// THREADS-SAME: task_id=[[PARENT_TASK_ID]]
+
+// THREADS-NOT: {{^}}[[THREAD_ID]]: ompt_event_implicit_task_end
+
+// THREADS: {{^}}[[THREAD_ID]]: ompt_event_barrier_begin:
+// THREADS-SAME: parallel_id=[[NESTED_PARALLEL_ID]],
+// THREADS-SAME: task_id=[[NESTED_IMPLICIT_TASK_ID]]
+
+// THREADS: {{^}}[[THREAD_ID]]: ompt_event_barrier_end:
+// THREADS-SAME: parallel_id={{[0-9]+}}, task_id=[[NESTED_IMPLICIT_TASK_ID]]
+
+// THREADS: {{^}}[[THREAD_ID]]: ompt_event_implicit_task_end:
+// THREADS-SAME: parallel_id={{[0-9]+}}, task_id=[[NESTED_IMPLICIT_TASK_ID]]
+
+// THREADS: {{^}}[[THREAD_ID]]: ompt_event_parallel_end:
+// THREADS-SAME: parallel_id=[[NESTED_PARALLEL_ID]],
+// THREADS-SAME: task_id=[[IMPLICIT_TASK_ID]], invoker=[[PARALLEL_INVOKER]]
+
+// THREADS-NOT: {{^}}[[THREAD_ID]]: ompt_event_implicit_task_end
+
+// THREADS: {{^}}[[THREAD_ID]]: ompt_event_barrier_begin:
+// THREADS-SAME: parallel_id=[[PARALLEL_ID]], task_id=[[IMPLICIT_TASK_ID]]
+
+// THREADS: {{^}}[[THREAD_ID]]: ompt_event_barrier_end:
+// THREADS-SAME: parallel_id={{[0-9]+}}, task_id=[[IMPLICIT_TASK_ID]]
+
+// THREADS: {{^}}[[THREAD_ID]]: ompt_event_implicit_task_end:
+// THREADS-SAME: parallel_id={{[0-9]+}}, task_id=[[IMPLICIT_TASK_ID]]
+
+// nested parallel worker threads
+
+// THREADS: {{^}}[[THREAD_ID:[0-9]+]]: ompt_event_implicit_task_begin:
+// THREADS-SAME: parallel_id=[[NESTED_PARALLEL_ID:[0-9]+]],
+// THREADS-SAME: task_id=[[IMPLICIT_TASK_ID:[0-9]+]]
+// THREADS-SAME: thread_num=[[THREADNUM:[0-9]+]]
+
+// THREADS: {{^}}[[THREAD_ID]]: task level 0:
+// THREADS-SAME: parallel_id=[[NESTED_PARALLEL_ID]],
+// THREADS-SAME: task_id=[[IMPLICIT_TASK_ID]]
+// THREADS-SAME: thread_num=[[THREADNUM]]
+
+// can't reliably tell which parallel region is the parent...
+
+// THREADS: {{^}}[[THREAD_ID]]: task level 1: parallel_id={{[0-9]+}},
+// THREADS-SAME: task_id={{[0-9]+}}
+// THREADS-SAME: thread_num={{[01]}}
+
+// THREADS: {{^}}[[THREAD_ID]]: task level 2:
+// THREADS-SAME: parallel_id=[[IMPLICIT_PARALLEL_ID]],
+// THREADS-SAME: task_id=[[PARENT_TASK_ID]]
+// THREADS-SAME: thread_num=0
+
+// THREADS-NOT: {{^}}[[THREAD_ID]]: ompt_event_implicit_task_end
+
+// THREADS: {{^}}[[THREAD_ID]]: ompt_event_barrier_begin:
+// THREADS-SAME: parallel_id=[[NESTED_PARALLEL_ID]],
+// THREADS-SAME: task_id=[[IMPLICIT_TASK_ID]]
+
+// THREADS: {{^}}[[THREAD_ID]]: ompt_event_barrier_end:
+// THREADS-SAME: parallel_id={{[0-9]+}}, task_id=[[IMPLICIT_TASK_ID]]
+
+// THREADS: {{^}}[[THREAD_ID]]: ompt_event_implicit_task_end:
+// THREADS-SAME: parallel_id={{[0-9]+}}, task_id=[[IMPLICIT_TASK_ID]]
+
+// other nested parallel worker threads
+
+// THREADS: {{^}}[[THREAD_ID:[0-9]+]]: ompt_event_implicit_task_begin:
+// THREADS-SAME: parallel_id=[[NESTED_PARALLEL_ID:[0-9]+]],
+// THREADS-SAME: task_id=[[IMPLICIT_TASK_ID:[0-9]+]]
+// THREADS-SAME: thread_num=[[THREADNUM:[0-9]+]]
+
+// THREADS: {{^}}[[THREAD_ID]]: task level 0:
+// THREADS-SAME: parallel_id=[[NESTED_PARALLEL_ID]],
+// THREADS-SAME: task_id=[[IMPLICIT_TASK_ID]]
+// THREADS-SAME: thread_num=[[THREADNUM]]
+
+// can't reliably tell which parallel region is the parent...
+
+// THREADS: {{^}}[[THREAD_ID]]: task level 1: parallel_id={{[0-9]+}},
+// THREADS-SAME: task_id={{[0-9]+}}
+// THREADS-SAME: thread_num={{[01]}}
+
+// THREADS: {{^}}[[THREAD_ID]]: task level 2:
+// THREADS-SAME: parallel_id=[[IMPLICIT_PARALLEL_ID]],
+// THREADS-SAME: task_id=[[PARENT_TASK_ID]]
+// THREADS-SAME: thread_num=0
+
+// THREADS-NOT: {{^}}[[THREAD_ID]]: ompt_event_implicit_task_end
+
+// THREADS: {{^}}[[THREAD_ID]]: ompt_event_barrier_begin:
+// THREADS-SAME: parallel_id=[[NESTED_PARALLEL_ID]],
+// THREADS-SAME: task_id=[[IMPLICIT_TASK_ID]]
+
+// THREADS: {{^}}[[THREAD_ID]]: ompt_event_barrier_end:
+// THREADS-SAME: parallel_id={{[0-9]+}}, task_id=[[IMPLICIT_TASK_ID]]
+
+// THREADS: {{^}}[[THREAD_ID]]: ompt_event_implicit_task_end:
+// THREADS-SAME: parallel_id={{[0-9]+}}, task_id=[[IMPLICIT_TASK_ID]]
+
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