Add support for progress events in OpenMP

Two new events are added (Ppp and Pps) which define the Progressing and
Stalled states respectively. A new pseudo-state Idle is shown in the
view when no thread is running.

cfg/cpu/openmp/breakdown.cfg

@@ -0,0 +1,44 @@
+#ParaverCFG
+ConfigFile.Version: 3.4
+ConfigFile.NumWindows: 1
+
+
+################################################################################
+< NEW DISPLAYING WINDOW CPU: OpenMP Runtime/Label breakdown >
+################################################################################
+window_name CPU: OpenMP Runtime/Label breakdown
+window_type single
+window_id 1
+window_position_x 100
+window_position_y 100
+window_width 600
+window_height 150
+window_comm_lines_enabled false
+window_flags_enabled false
+window_noncolor_mode true
+window_custom_color_enabled true
+window_custom_color_palette {1.000000000000:0,70,0},{3.000000000000:99,131,0},{4.000000000000:53,121,221},{5.000000000000:223,108,0},{6.000000000000:75,127,82},{7.000000000000:242,110,162},{8.000000000000:255,190,0},{9.000000000000:153,114,0},{10.000000000000:156,12,231},{11.000000000000:177,25,229},{12.000000000000:255,72,50},{15.000000000000:0,171,255},{16.000000000000:124,213,228},{17.000000000000:242,239,141},{18.000000000000:80,80,80},{19.000000000000:94,0,0},{20.000000000000:128,165,214},{22.000000000000:222,101,128},{23.000000000000:110,148,255},{100.000000000000:0,100,0},{101.000000000000:100,100,177},{102.000000000000:150,150,0}
+window_logical_filtered true
+window_physical_filtered false
+window_comm_fromto true
+window_comm_tagsize true
+window_comm_typeval true
+window_units Microseconds
+window_maximum_y 1000.0
+window_minimum_y 1.0
+window_compute_y_max true
+window_level thread
+window_scale_relative 1.000000000000
+window_end_time_relative 1.000000000000
+window_object appl { 1, { All } }
+window_begin_time_relative 0.000000000000
+window_open true
+window_drawmode draw_randnotzero
+window_drawmode_rows draw_randnotzero
+window_pixel_size 1
+window_labels_to_draw 1
+window_selected_functions { 14, { {cpu, Active Thd}, {appl, Adding}, {task, Adding}, {thread, Last Evt Val}, {node, Adding}, {system, Adding}, {workload, Adding}, {from_obj, All}, {to_obj, All}, {tag_msg, All}, {size_msg, All}, {bw_msg, All}, {evt_type, =}, {evt_value, All} } }
+window_compose_functions { 9, { {compose_cpu, As Is}, {compose_appl, As Is}, {compose_task, As Is}, {compose_thread, As Is}, {compose_node, As Is}, {compose_system, As Is}, {compose_workload, As Is}, {topcompose1, As Is}, {topcompose2, As Is} } }
+window_filter_module evt_type 1 54
+window_filter_module evt_type_label 1 "CPU: OpenMP Runtime/Label breakdown"
+

doc/user/emulation/events.md

@@ -1,7 +1,7 @@
 # Emulator events
 
 This is a exhaustive list of the events recognized by the emulator.
-Built on Nov 13 2024.
+Built on Feb  5 2025.
 
 ## Model nanos6
 
@@ -437,7 +437,7 @@ List of events for the model *ovni* with identifier **`O`** at version `1.1.0`:
 
 ## Model openmp
 
-List of events for the model *openmp* with identifier **`P`** at version `1.2.0`:
+List of events for the model *openmp* with identifier **`P`** at version `1.3.0`:
 <dl>
 <dt><a id="PBb" href="#PBb"><pre>PBb</pre></a></dt>
 <dd>begins plain barrier</dd>
@@ -575,6 +575,10 @@ List of events for the model *openmp* with identifier **`P`** at version `1.2.0`
 <dd>begins worksharing with type %{typeid}</dd>
 <dt><a id="PQe" href="#PQe"><pre>PQe(u32 typeid)</pre></a></dt>
 <dd>ends worksharing with type %{typeid}</dd>
+<dt><a id="Ppp" href="#Ppp"><pre>Ppp</pre></a></dt>
+<dd>sets progress state to Progressing</dd>
+<dt><a id="Pps" href="#Pps"><pre>Pps</pre></a></dt>
+<dd>sets progress state to Stalled</dd>
 </dl>
 
 ## Model tampi

doc/user/emulation/openmp.md

@@ -177,6 +177,19 @@ currently running on each thread. The ID is a monotonically increasing
 identifier assigned on task creation. Lower IDs correspond to tasks
 created at an earlier point than higher IDs.
 
+## Idle view
+
+The idle view shows the progress state of the running threads:
+*Progressing* and *Stalled*. The *Progressing* state is shown when they
+are making useful progress and the *Stalled* state when they are waiting
+for work. When workers start running, by definition, they begin in the
+Progressing state and there are some situations that make them
+transition to Stalled...
+
+!!! Note
+
+    TODO: Complete description
+
 ## Limitations
 
 As the compiler generates the code that perform the calls to the libompv

src/emu/CMakeLists.txt

@@ -65,6 +65,7 @@ add_library(emu STATIC
   kernel/event.c
   openmp/setup.c
   openmp/event.c
+  openmp/breakdown.c
 )
 target_link_libraries(emu ovni-static)
 

src/emu/emu_prv.h

@@ -1,4 +1,4 @@
-/* Copyright (c) 2021-2024 Barcelona Supercomputing Center (BSC)
+/* Copyright (c) 2021-2025 Barcelona Supercomputing Center (BSC)
  * SPDX-License-Identifier: GPL-3.0-or-later */
 
 #ifndef EMU_PRV_H
@@ -35,6 +35,8 @@ enum emu_prv_types {
 	PRV_OPENMP_SUBSYSTEM = 50,
 	PRV_OPENMP_LABEL     = 51,
 	PRV_OPENMP_TASKID    = 52,
+	PRV_OPENMP_IDLE      = 53,
+	PRV_OPENMP_BREAKDOWN = 54,
 	PRV_OVNI_MARK        = 100,
 	/* User marks [100, 200) */
 	PRV_RESERVED         = 200,

src/emu/nanos6/setup.c

@@ -313,7 +313,7 @@ model_nanos6_create(struct emu *emu)
 	extend_set(&emu->ext, model_id, e);
 
 	if (model_nanos6_breakdown_create(emu) != 0) {
-		err("model_nanos6_breakdown_connect failed");
+		err("model_nanos6_breakdown_create failed");
 		return -1;
 	}
 

src/emu/nosv/breakdown.c

@@ -80,6 +80,20 @@ model_nosv_breakdown_create(struct emu *emu)
 	struct nosv_emu *memu = EXT(emu, 'V');
 	struct nosv_breakdown_emu *bemu = &memu->breakdown;
 
+	/* Ensure all threads have breakdown enabled */
+	bemu->enabled = 1;
+	for (struct thread *th = emu->system.threads; th; th = th->gnext) {
+		if (check_thread_metadata(th) != 0) {
+			err("bad nosv metadata in thread: %s", th->id);
+			bemu->enabled = 0;
+		}
+	}
+
+	if (!bemu->enabled) {
+		warn("cannot enable breakdown for nOS-V model");
+		return 0;
+	}
+
 	/* Count phy cpus */
 	struct system *sys = &emu->system;
 	int64_t nphycpus = (int64_t) (sys->ncpus - sys->nlooms);
@@ -111,13 +125,6 @@ model_nosv_breakdown_create(struct emu *emu)
 		}
 	}
 
-	for (struct thread *th = emu->system.threads; th; th = th->gnext) {
-		if (check_thread_metadata(th) != 0) {
-			err("bad nosv metadata in thread: %s", th->id);
-			return -1;
-		}
-	}
-
 	return 0;
 }
 
@@ -241,6 +248,10 @@ model_nosv_breakdown_connect(struct emu *emu)
 
 	struct nosv_emu *memu = EXT(emu, 'V');
 	struct nosv_breakdown_emu *bemu = &memu->breakdown;
+
+	if (!bemu->enabled)
+		return 0;
+
 	struct bay *bay = &emu->bay;
 	struct system *sys = &emu->system;
 
@@ -290,6 +301,10 @@ model_nosv_breakdown_finish(struct emu *emu,
 
 	struct nosv_emu *memu = EXT(emu, 'V');
 	struct nosv_breakdown_emu *bemu = &memu->breakdown;
+
+	if (!bemu->enabled)
+		return 0;
+
 	struct pcf *pcf = pvt_get_pcf(bemu->pvt);
 	long typeid = PRV_NOSV_BREAKDOWN;
 	char label[] = "CPU: nOS-V Runtime/Idle/Task breakdown";

src/emu/nosv/breakdown.h

@@ -51,6 +51,7 @@ struct nosv_breakdown_emu {
 	int64_t nphycpus;
 	struct sort sort;
 	struct pvt *pvt;
+	int enabled;
 };
 
 #endif /* BREAKDOWN_H */

src/emu/openmp/breakdown.c

@@ -0,0 +1,239 @@
+/* Copyright (c) 2024 Barcelona Supercomputing Center (BSC)
+ * SPDX-License-Identifier: GPL-3.0-or-later */
+
+#include "breakdown.h"
+#include <stdint.h>
+#include <stdio.h>
+#include "bay.h"
+#include "chan.h"
+#include "common.h"
+#include "cpu.h"
+#include "emu.h"
+#include "emu_args.h"
+#include "emu_prv.h"
+#include "extend.h"
+#include "model_cpu.h"
+#include "mux.h"
+#include "openmp_priv.h"
+#include "proc.h"
+#include "pv/pcf.h"
+#include "pv/prf.h"
+#include "pv/prv.h"
+#include "pv/pvt.h"
+#include "recorder.h"
+#include "sort.h"
+#include "system.h"
+#include "task.h"
+#include "track.h"
+#include "value.h"
+
+
+static int
+create_cpu(struct bay *bay, struct breakdown_cpu *bcpu, int64_t gindex)
+{
+	enum chan_type t = CHAN_SINGLE;
+	chan_init(&bcpu->tri, t, "openmp.cpu%"PRIi64".breakdown.tri", gindex);
+
+	if (bay_register(bay, &bcpu->tri) != 0) {
+		err("bay_register tri failed");
+		return -1;
+	}
+
+	return 0;
+}
+
+int
+model_openmp_breakdown_create(struct emu *emu)
+{
+	if (emu->args.breakdown == 0)
+		return 0;
+
+	struct openmp_emu *memu = EXT(emu, 'P');
+	struct breakdown_emu *bemu = &memu->breakdown;
+
+	/* Count phy cpus */
+	struct system *sys = &emu->system;
+	int64_t nphycpus = (int64_t) (sys->ncpus - sys->nlooms);
+	bemu->nphycpus = nphycpus;
+
+	/* Create a new Paraver trace */
+	struct recorder *rec = &emu->recorder;
+	bemu->pvt = recorder_add_pvt(rec, "openmp-breakdown", (long) nphycpus);
+	if (bemu->pvt == NULL) {
+		err("recorder_add_pvt failed");
+		return -1;
+	}
+
+	if (sort_init(&bemu->sort, &emu->bay, nphycpus, "openmp.breakdown.sort") != 0) {
+		err("sort_init failed");
+		return -1;
+	}
+
+	for (struct cpu *cpu = sys->cpus; cpu; cpu = cpu->next) {
+		if (cpu->is_virtual)
+			continue;
+
+		struct openmp_cpu *mcpu = EXT(cpu, 'P');
+		struct breakdown_cpu *bcpu = &mcpu->breakdown;
+
+		if (create_cpu(&emu->bay, bcpu, cpu->gindex) != 0) {
+			err("create_cpu failed");
+			return -1;
+		}
+	}
+
+	return 0;
+}
+
+static int
+select_label(struct mux *mux, struct value value, struct mux_input **input)
+{
+	dbg("selecting tri output for value %s", value_str(value));
+
+	if (value.type != VALUE_NULL) {
+		dbg("selecting input 0 (label)");
+		*input = mux_get_input(mux, 0);
+	} else {
+		dbg("selecting input 1 (subsystem)");
+		*input = mux_get_input(mux, 1);
+	}
+
+	return 0;
+}
+
+static int
+connect_cpu(struct bay *bay, struct openmp_cpu *mcpu)
+{
+	struct breakdown_cpu *bcpu = &mcpu->breakdown;
+
+	/* Channel aliases */
+	struct chan *subsystem = &mcpu->m.track[CH_SUBSYSTEM].ch;
+	struct chan *label = &mcpu->m.track[CH_LABEL].ch;
+	struct chan *tri = &bcpu->tri;
+
+	/* Connect mux using label as select */
+	if (mux_init(&bcpu->mux, bay, label, tri, select_label, 2) != 0) {
+		err("mux_init failed");
+		return -1;
+	}
+
+	if (mux_set_input(&bcpu->mux, 0, label) != 0) {
+		err("mux_set_input label failed");
+		return -1;
+	}
+
+	if (mux_set_input(&bcpu->mux, 1, subsystem) != 0) {
+		err("mux_set_input subsystem failed");
+		return -1;
+	}
+
+	/* Emit unknown subsystem on NULL */
+	//mux_set_default(&bcpu->mux, value_int64(ST_UNKNOWN_SS));
+
+	return 0;
+}
+
+int
+model_openmp_breakdown_connect(struct emu *emu)
+{
+	if (emu->args.breakdown == 0)
+		return 0;
+
+	struct openmp_emu *memu = EXT(emu, 'P');
+	struct breakdown_emu *bemu = &memu->breakdown;
+	struct bay *bay = &emu->bay;
+	struct system *sys = &emu->system;
+
+	int64_t i = 0;
+	for (struct cpu *cpu = sys->cpus; cpu; cpu = cpu->next) {
+		if (cpu->is_virtual)
+			continue;
+
+		struct openmp_cpu *mcpu = EXT(cpu, 'P');
+		struct breakdown_cpu *bcpu = &mcpu->breakdown;
+
+		/* Connect tri channels and muxes */
+		if (connect_cpu(bay, mcpu) != 0) {
+			err("connect_cpu failed");
+			return -1;
+		}
+
+		/* Connect tri to sort */
+		if (sort_set_input(&bemu->sort, i, &bcpu->tri) != 0) {
+			err("sort_set_input failed");
+			return -1;
+		}
+
+		/* Connect out to PRV */
+		struct prv *prv = pvt_get_prv(bemu->pvt);
+		long type = PRV_OPENMP_BREAKDOWN;
+		long flags = PRV_SKIPDUP;
+
+		/* We may emit zero at the start, when an input changes and all
+		 * the other sort output channels write a zero in the output,
+		 * before the last value is set in prv.c. */
+		flags |= PRV_ZERO;
+
+		struct chan *out = sort_get_output(&bemu->sort, i);
+		if (prv_register(prv, (long) i, type, bay, out, flags)) {
+			err("prv_register failed");
+			return -1;
+		}
+
+		i++;
+	}
+
+	return 0;
+}
+
+int
+model_openmp_breakdown_finish(struct emu *emu,
+		const struct pcf_value_label **labels)
+{
+	if (emu->args.breakdown == 0)
+		return 0;
+
+	struct openmp_emu *memu = EXT(emu, 'P');
+	struct breakdown_emu *bemu = &memu->breakdown;
+	struct pcf *pcf = pvt_get_pcf(bemu->pvt);
+	long typeid = PRV_OPENMP_BREAKDOWN;
+	char label[] = "CPU: OpenMP Runtime/Label breakdown";
+	struct pcf_type *pcftype = pcf_add_type(pcf, (int) typeid, label);
+	const struct pcf_value_label *v = NULL;
+
+	/* Emit subsystem values */
+	for (v = labels[CH_SUBSYSTEM]; v->label; v++) {
+		if (pcf_add_value(pcftype, v->value, v->label) == NULL) {
+			err("pcf_add_value ss failed");
+			return -1;
+		}
+	}
+
+	/* Emit label values */
+	struct system *sys = &emu->system;
+	for (struct proc *p = sys->procs; p; p = p->gnext) {
+		struct openmp_proc *proc = EXT(p, 'P');
+		struct task_info *info = &proc->task_info;
+		if (task_create_pcf_types(pcftype, info->types) != 0) {
+			err("task_create_pcf_types failed");
+			return -1;
+		}
+	}
+
+	/* Also populate the row labels */
+	struct prf *prf = pvt_get_prf(bemu->pvt);
+	for (int64_t row = 0; row < bemu->nphycpus; row++) {
+		char name[128];
+		if (snprintf(name, 128, "~CPU %4" PRIi64, bemu->nphycpus - row) >= 128) {
+			err("label too long");
+			return -1;
+		}
+
+		if (prf_add(prf, (long) row, name) != 0) {
+			err("prf_add failed for %s", name);
+			return -1;
+		}
+	}
+
+	return 0;
+}

src/emu/openmp/breakdown.h

@@ -0,0 +1,48 @@
+/* Copyright (c) 2024 Barcelona Supercomputing Center (BSC)
+ * SPDX-License-Identifier: GPL-3.0-or-later */
+
+#ifndef BREAKDOWN_H
+#define BREAKDOWN_H
+
+/* 
+ * The breakdown model is implemented on top of the CPU subsystem, task_type and
+ * idle channels. The first mux0 selects the task type when the subsystem
+ * matches "Task body" otherwise forwards the subsystem as-is to tr. The second
+ * mux1 selects tr only when the CPU is not Idle, otherwise sets the output tri
+ * as Idle.
+ *
+ *            +--------+
+ *            |        |
+ *            |        v
+ *            |     +------+
+ * label -----+-->--|      |
+ *                  | mux0 |
+ * subsystem ---->--|      |-->-- tri
+ *                  +------+
+ * Then the sort module takes the output tri of each CPU and sorts the values
+ * which are propagated to the PRV directly.
+ *
+ *                 +------+       +-----+
+ * cpu0.tri --->---|      |--->---|     |
+ * ...             | sort |  ...  | PRV |
+ * cpuN.tri --->---|      |--->---|     |
+ *                 +------+       +-----+
+ */
+
+#include <stdint.h>
+#include "chan.h"
+#include "mux.h"
+#include "sort.h"
+
+struct breakdown_cpu {
+	struct mux  mux;
+	struct chan tri;
+};
+
+struct breakdown_emu {
+	int64_t nphycpus;
+	struct sort sort;
+	struct pvt *pvt;
+};
+
+#endif /* BREAKDOWN_H */

src/emu/openmp/event.c

@@ -1,4 +1,4 @@
-/* Copyright (c) 2023-2024 Barcelona Supercomputing Center (BSC)
+/* Copyright (c) 2023-2025 Barcelona Supercomputing Center (BSC)
  * SPDX-License-Identifier: GPL-3.0-or-later */
 
 #include "openmp_priv.h"
@@ -14,7 +14,7 @@
 #include "thread.h"
 #include "value.h"
 
-enum { PUSH = 1, POP = 2, IGN = 3 };
+enum { PUSH = 1, POP, SET, IGN };
 
 static const int fn_table[256][256][3] = {
 	['B'] = {
@@ -95,6 +95,10 @@ static const int fn_table[256][256][3] = {
 		['f'] = { CH_SUBSYSTEM, PUSH, ST_RT_FORK_CALL },
 		['F'] = { CH_SUBSYSTEM, POP,  ST_RT_FORK_CALL },
 	},
+	['p'] = {
+		['p'] = { CH_IDLE, SET, ST_PROGRESSING },
+		['s'] = { CH_IDLE, SET, ST_STALLED },
+	},
 };
 
 static int
@@ -117,6 +121,8 @@ simple(struct emu *emu)
 		return chan_push(ch, value_int64(st));
 	} else if (action == POP) {
 		return chan_pop(ch, value_int64(st));
+	} else if (action == SET) {
+		return chan_set(ch, value_int64(st));
 	} else if (action == IGN) {
 		return 0; /* do nothing */
 	}
@@ -369,6 +375,7 @@ process_ev(struct emu *emu)
 		case 'M':
 		case 'H':
 		case 'C':
+		case 'p':
 			return simple(emu);
 		case 'P':
 			return pre_task(emu);

src/emu/openmp/openmp_priv.h

@@ -1,4 +1,4 @@
-/* Copyright (c) 2023-2024 Barcelona Supercomputing Center (BSC)
+/* Copyright (c) 2023-2025 Barcelona Supercomputing Center (BSC)
  * SPDX-License-Identifier: GPL-3.0-or-later */
 
 #ifndef OPENMP_PRIV_H
@@ -8,6 +8,7 @@
 #include "task.h"
 #include "model_cpu.h"
 #include "model_thread.h"
+#include "breakdown.h"
 
 /* Private enums */
 
@@ -15,6 +16,7 @@ enum openmp_chan {
 	CH_SUBSYSTEM = 0,
 	CH_LABEL,
 	CH_TASKID,
+	CH_IDLE,
 	CH_MAX,
 };
 
@@ -56,6 +58,14 @@ enum openmp_function_values {
 	ST_RT_WORKER_LOOP,
 };
 
+enum openmp_progress_values {
+	/* Can mix with subsystem values */
+	ST_PROGRESSING = 100,
+	ST_STALLED, /* Running thread doing nothing useful */
+	ST_IDLE,    /* No running threads */
+};
+
+
 struct openmp_thread {
 	struct model_thread m;
 	struct task_stack task_stack;
@@ -63,6 +73,7 @@ struct openmp_thread {
 
 struct openmp_cpu {
 	struct model_cpu m;
+	struct breakdown_cpu breakdown;
 };
 
 struct openmp_proc {
@@ -70,10 +81,19 @@ struct openmp_proc {
 	struct task_info task_info;
 };
 
+struct openmp_emu {
+	struct breakdown_emu breakdown;
+};
+
 int model_openmp_probe(struct emu *emu);
 int model_openmp_create(struct emu *emu);
 int model_openmp_connect(struct emu *emu);
 int model_openmp_event(struct emu *emu);
 int model_openmp_finish(struct emu *emu);
 
+int model_openmp_breakdown_create(struct emu *emu);
+int model_openmp_breakdown_connect(struct emu *emu);
+int model_openmp_breakdown_finish(struct emu *emu,
+		const struct pcf_value_label **labels);
+
 #endif /* OPENMP_PRIV_H */

src/emu/openmp/setup.c

@@ -1,10 +1,11 @@
-/* Copyright (c) 2023-2024 Barcelona Supercomputing Center (BSC)
+/* Copyright (c) 2023-2025 Barcelona Supercomputing Center (BSC)
  * SPDX-License-Identifier: GPL-3.0-or-later */
 
 #include "openmp_priv.h"
 #include <stddef.h>
 #include "chan.h"
 #include "common.h"
+#include "cpu.h"
 #include "emu.h"
 #include "emu_args.h"
 #include "emu_prv.h"
@@ -77,12 +78,15 @@ static struct ev_decl model_evlist[] = {
 	{ "PQx(u32 typeid)", "begins worksharing with type %{typeid}" },
 	{ "PQe(u32 typeid)", "ends worksharing with type %{typeid}" },
 
+	{ "Ppp", "sets progress state to Progressing" },
+	{ "Pps", "sets progress state to Stalled" },
+
 	{ NULL, NULL },
 };
 
 struct model_spec model_openmp = {
 	.name = model_name,
-	.version = "1.2.0",
+	.version = "1.3.0",
 	.evlist  = model_evlist,
 	.model = model_id,
 	.create  = model_openmp_create,
@@ -98,6 +102,7 @@ static const char *chan_name[CH_MAX] = {
 	[CH_SUBSYSTEM] = "subsystem",
 	[CH_LABEL]     = "label",
 	[CH_TASKID]    = "task ID",
+	[CH_IDLE]      = "idle",
 };
 
 static const int chan_stack[CH_MAX] = {
@@ -118,12 +123,14 @@ static const int pvt_type[CH_MAX] = {
 	[CH_SUBSYSTEM] = PRV_OPENMP_SUBSYSTEM,
 	[CH_LABEL]     = PRV_OPENMP_LABEL,
 	[CH_TASKID]    = PRV_OPENMP_TASKID,
+	[CH_IDLE]      = PRV_OPENMP_IDLE,
 };
 
 static const char *pcf_prefix[CH_MAX] = {
 	[CH_SUBSYSTEM] = "OpenMP subsystem",
 	[CH_LABEL]     = "OpenMP label",
 	[CH_TASKID]    = "OpenMP task ID",
+	[CH_IDLE]      = "OpenMP idle",
 };
 
 static const struct pcf_value_label openmp_subsystem_values[] = {
@@ -166,14 +173,23 @@ static const struct pcf_value_label openmp_subsystem_values[] = {
 	{ -1, NULL },
 };
 
+static const struct pcf_value_label openmp_progress_values[] = {
+	{ ST_PROGRESSING, "Progressing" },
+	{ ST_STALLED,     "Stalled" },
+	{ ST_IDLE,        "Idle" },
+	{ -1, NULL },
+};
+
 static const struct pcf_value_label *pcf_labels[CH_MAX] = {
 	[CH_SUBSYSTEM] = openmp_subsystem_values,
+	[CH_IDLE]      = openmp_progress_values,
 };
 
 static const long prv_flags[CH_MAX] = {
 	[CH_SUBSYSTEM] = PRV_SKIPDUPNULL,
 	[CH_LABEL]     = PRV_SKIPDUPNULL,
 	[CH_TASKID]    = PRV_SKIPDUPNULL,
+	[CH_IDLE]      = PRV_SKIPDUPNULL,
 };
 
 static const struct model_pvt_spec pvt_spec = {
@@ -189,12 +205,14 @@ static const int th_track[CH_MAX] = {
 	[CH_SUBSYSTEM] = TRACK_TH_ACT,
 	[CH_LABEL]     = TRACK_TH_ACT,
 	[CH_TASKID]    = TRACK_TH_ACT,
+	[CH_IDLE]      = TRACK_TH_ACT,
 };
 
 static const int cpu_track[CH_MAX] = {
 	[CH_SUBSYSTEM] = TRACK_TH_RUN,
 	[CH_LABEL]     = TRACK_TH_RUN,
 	[CH_TASKID]    = TRACK_TH_RUN,
+	[CH_IDLE]      = TRACK_TH_RUN,
 };
 
 /* ----------------- chan_spec ------------------ */
@@ -278,6 +296,19 @@ model_openmp_create(struct emu *emu)
 		}
 	}
 
+	struct openmp_emu *e = calloc(1, sizeof(struct openmp_emu));
+	if (e == NULL) {
+		err("calloc failed:");
+		return -1;
+	}
+
+	extend_set(&emu->ext, model_id, e);
+
+	if (model_openmp_breakdown_create(emu) != 0) {
+		err("model_openmp_breakdown_create failed");
+		return -1;
+	}
+
 	return 0;
 }
 
@@ -294,6 +325,28 @@ model_openmp_connect(struct emu *emu)
 		return -1;
 	}
 
+	if (model_openmp_breakdown_connect(emu) != 0) {
+		err("model_openmp_breakdown_connect failed");
+		return -1;
+	}
+
+	for (struct thread *th = emu->system.threads; th; th = th->gnext) {
+		struct openmp_thread *mth = EXT(th, model_id);
+		struct chan *idle = &mth->m.ch[CH_IDLE];
+		/* By default set all threads as Progressing */
+		if (chan_set(idle, value_int64(ST_PROGRESSING)) != 0) {
+			err("chan_push idle failed");
+			return -1;
+		}
+	}
+
+	for (struct cpu *cpu = emu->system.cpus; cpu; cpu = cpu->next) {
+		struct openmp_cpu *mcpu = EXT(cpu, model_id);
+		struct mux *mux = &mcpu->m.track[CH_IDLE].mux;
+		/* Emit Idle when a CPU has no running threads */
+		mux_set_default(mux, value_int64(ST_IDLE));
+	}
+
 	return 0;
 }
 
@@ -379,6 +432,11 @@ model_openmp_finish(struct emu *emu)
 		return -1;
 	}
 
+	if (model_openmp_breakdown_finish(emu, pcf_labels) != 0) {
+		err("model_openmp_breakdown_finish failed");
+		return -1;
+	}
+
 	/* When running in linter mode perform additional checks */
 	if (emu->args.linter_mode && end_lint(emu) != 0) {
 		err("end_lint failed");

test/emu/openmp/CMakeLists.txt

@@ -1,6 +1,7 @@
-# Copyright (c) 2024 Barcelona Supercomputing Center (BSC)
+# Copyright (c) 2024-2025 Barcelona Supercomputing Center (BSC)
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 test_emu(nested-ws.c)
 test_emu(nested-task.c)
 test_emu(mix-task-ws.c)
+test_emu(idle.c)

test/emu/openmp/idle.c

@@ -0,0 +1,34 @@
+/* Copyright (c) 2025 Barcelona Supercomputing Center (BSC)
+ * SPDX-License-Identifier: GPL-3.0-or-later */
+
+#include <stdlib.h>
+#include "compat.h"
+#include "instr.h"
+#include "instr_openmp.h"
+
+int
+main(void)
+{
+	instr_start(0, 1);
+	instr_openmp_init();
+
+	instr_openmp_type_create(1, "task");
+	instr_openmp_task_create(1, 1);
+
+	instr_openmp_stalled();
+	sleep_us(100);
+	instr_openmp_progressing();
+	sleep_us(100);
+	/* Pause the thread to create Idle state */
+	instr_thread_pause();
+	sleep_us(100);
+	instr_thread_resume();
+	sleep_us(100);
+	instr_openmp_task_execute(1);
+	sleep_us(100);
+	instr_openmp_task_end(1);
+
+	instr_end();
+
+	return 0;
+}

test/emu/openmp/instr_openmp.h

@@ -1,4 +1,4 @@
-/* Copyright (c) 2024 Barcelona Supercomputing Center (BSC)
+/* Copyright (c) 2024-2025 Barcelona Supercomputing Center (BSC)
  * SPDX-License-Identifier: GPL-3.0-or-later */
 
 #ifndef INSTR_OPENMP_H
@@ -44,4 +44,7 @@ INSTR_1ARG(instr_openmp_task_end,     "PPe", uint32_t, taskid)
 INSTR_1ARG(instr_openmp_ws_enter, "PQx", uint32_t, typeid)
 INSTR_1ARG(instr_openmp_ws_exit,  "PQe", uint32_t, typeid)
 
+INSTR_0ARG(instr_openmp_progressing, "Ppp")
+INSTR_0ARG(instr_openmp_stalled,     "Pps")
+
 #endif /* INSTR_OPENMP_H */

test/rt/openmp/CMakeLists.txt

@@ -26,7 +26,7 @@ if(NOT NOSV_FOUND)
 endif()
 
 function(openmp_rt_test)
-  ovni_test(${ARGN})
+  ovni_test(${ARGN} SORT)
   target_compile_options("${OVNI_TEST_NAME}" PUBLIC "-fopenmp=libompv"
 	  "-no-pedantic")
   target_link_options("${OVNI_TEST_NAME}" PUBLIC "-fopenmp=libompv")
@@ -34,7 +34,7 @@ function(openmp_rt_test)
   set_property(TEST "${OVNI_TEST_NAME}" APPEND PROPERTY
     ENVIRONMENT "OMP_OVNI=1")
   set_property(TEST "${OVNI_TEST_NAME}" APPEND PROPERTY
-    ENVIRONMENT "NOSV_CONFIG_OVERRIDE=instrumentation.version=ovni")
+    ENVIRONMENT "NOSV_CONFIG_OVERRIDE=instrumentation.version=ovni,ovni.level=3")
 endfunction()
 
 openmp_rt_test(barrier-explicit.c)
@@ -53,7 +53,7 @@ openmp_rt_test(taskloop.c)
 openmp_rt_test(taskwait.c)
 openmp_rt_test(team-distribute.c)
 openmp_rt_test(worksharing-and-tasks.c)
-openmp_rt_test(worksharing-mix.c)
+openmp_rt_test(worksharing-mix.c BREAKDOWN)
 openmp_rt_test(worksharing-task.c)
 openmp_rt_test(worksharing.c)
 openmp_rt_test(worksharing01.c)

test/rt/openmp/worksharing-mix.c

@@ -34,7 +34,7 @@ int main(void)
 		#pragma omp single
 		for (int i = 0; i < 100; i++)
 		{
-			#pragma omp task
+			#pragma omp task label("mini-task")
 			sleep_us(10);
 		}
 	}