From bacf33450da954eaa690a1d0e0f379e96a781e44 Mon Sep 17 00:00:00 2001
From: Rodrigo Arias Mallo <rodrigo.arias@bsc.es>
Date: Fri, 7 Oct 2022 13:08:51 +0200
Subject: [PATCH] Add burst stats test

---
 test/emu/ovni/CMakeLists.txt |  1 +
 test/emu/ovni/burst-stats.c  | 49 ++++++++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+)
 create mode 100644 test/emu/ovni/burst-stats.c

diff --git a/test/emu/ovni/CMakeLists.txt b/test/emu/ovni/CMakeLists.txt
index 78b07eb..e0327d7 100644
--- a/test/emu/ovni/CMakeLists.txt
+++ b/test/emu/ovni/CMakeLists.txt
@@ -11,5 +11,6 @@ ovni_test(sort.c SORT)
 ovni_test(empty-sort.c SORT)
 ovni_test(sort-first-and-full-ring.c SORT
   SHOULD_FAIL REGEX "cannot find a event previous to clock")
+ovni_test(burst-stats.c REGEX "burst stats: median 33 ns, avg 33\.0 ns, max 33 ns")
 ovni_test(mp-simple.c MP)
 ovni_test(mp-rank.c MP)
diff --git a/test/emu/ovni/burst-stats.c b/test/emu/ovni/burst-stats.c
new file mode 100644
index 0000000..d4b505c
--- /dev/null
+++ b/test/emu/ovni/burst-stats.c
@@ -0,0 +1,49 @@
+/* Copyright (c) 2021-2022 Barcelona Supercomputing Center (BSC)
+ * SPDX-License-Identifier: GPL-3.0-or-later */
+
+#define _POSIX_C_SOURCE 200112L
+#define _GNU_SOURCE
+
+#include <limits.h>
+#include <linux/limits.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "compat.h"
+#include "ovni.h"
+#include "../instr.h"
+
+static void
+emit(char *mcv, uint64_t clock)
+{
+	struct ovni_ev ev = {0};
+	ovni_ev_set_mcv(&ev, mcv);
+	ovni_ev_set_clock(&ev, clock);
+	ovni_ev_emit(&ev);
+}
+
+int
+main(void)
+{
+	instr_start(0, 1);
+
+	uint64_t t = ovni_clock_now();
+
+	/* Emit bursts with controlled clocks */
+	for (int i = 0; i < 100; i++) {
+		emit("OB.", t);
+		t += 33;
+	}
+
+	/* Sleep a bit to prevent unsorted events */
+	while (ovni_clock_now() < t)
+		usleep(10);
+
+	instr_end();
+
+	return 0;
+}