From e6af533d5eb211b3b01834621a1c022e07b124de Mon Sep 17 00:00:00 2001
From: Douglas Santos <douglas.santos@polymtl.ca>
Date: Thu, 18 Mar 2010 17:45:50 -0400
Subject: [PATCH] benchmark tool

---
 tests/benchmark/Makefile | 14 +++++++
 tests/benchmark/README   |  9 +++++
 tests/benchmark/bench.c  | 87 ++++++++++++++++++++++++++++++++++++++++
 tests/benchmark/install  | 15 +++++++
 tests/benchmark/run      | 37 +++++++++++++++++
 5 files changed, 162 insertions(+)
 create mode 100644 tests/benchmark/Makefile
 create mode 100644 tests/benchmark/README
 create mode 100644 tests/benchmark/bench.c
 create mode 100755 tests/benchmark/install
 create mode 100755 tests/benchmark/run

diff --git a/tests/benchmark/Makefile b/tests/benchmark/Makefile
new file mode 100644
index 0000000..b2922ce
--- /dev/null
+++ b/tests/benchmark/Makefile
@@ -0,0 +1,14 @@
+CC=gcc
+CFLAGS=-O3 -Wall
+LFLAGS=-lpthread -lust
+
+all: bench1 bench2
+
+bench1:
+	$(CC) $(CFLAGS) $(LFLAGS) -o bench1 bench.c
+bench2:
+	$(CC) $(CFLAGS) $(LFLAGS) -DMARKER -o bench2 bench.c
+
+
+clean:
+	rm -f *.o bench1 bench2
diff --git a/tests/benchmark/README b/tests/benchmark/README
new file mode 100644
index 0000000..8a9321d
--- /dev/null
+++ b/tests/benchmark/README
@@ -0,0 +1,9 @@
+UST Benchmark
+
+INSTALLATION INSTRUCTIONS:
+
+  - run ./install  to install and compile UST/benchmark
+  - run ./run  to perform the benchmark
+
+
+The trace files will be automatically saved at $HOME/.usttraces
diff --git a/tests/benchmark/bench.c b/tests/benchmark/bench.c
new file mode 100644
index 0000000..ec08130
--- /dev/null
+++ b/tests/benchmark/bench.c
@@ -0,0 +1,87 @@
+/*
+ * bench.c
+ *
+ * LTTng Userspace Tracer (UST) - benchmark tool
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <pthread.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sched.h>
+#include <ust/marker.h>
+
+static int nr_cpus;
+static unsigned long nr_events;
+pthread_mutex_t	mutex = PTHREAD_MUTEX_INITIALIZER;
+
+void do_stuff(void)
+{
+	int v;
+	FILE *file;
+	int lock;
+
+	v = 1;
+
+	lock = pthread_mutex_lock(&mutex);
+	file = fopen("/tmp/bench.txt", "a");
+	fprintf(file, "%d", v);
+	fclose(file);
+	lock = pthread_mutex_unlock(&mutex);
+
+#ifdef MARKER
+	trace_mark(ust, event, "event %d", v);
+#endif
+
+}
+
+
+void *function(void *arg)
+{
+	unsigned long i;
+
+	for(i = 0; i < nr_events; i++) {
+		do_stuff();
+	}
+	return NULL;
+}
+
+
+void usage(char **argv) {
+	printf("Usage: %s nr_cpus nr_events\n", argv[0]);
+}
+
+
+int main(int argc, char **argv)
+{
+	void *retval;
+	int i;
+
+	if (argc < 3) {
+		usage(argv);
+		exit(1);
+	}
+
+	nr_cpus = atoi(argv[1]);
+	printf("using %d processor(s)\n", nr_cpus);
+
+	nr_events = atol(argv[2]);
+	printf("using %ld events per cpu\n", nr_events);
+
+	pthread_t thread[nr_cpus];
+	for (i = 0; i < nr_cpus; i++) {
+		if (pthread_create(&thread[i], NULL, function, NULL)) {
+			fprintf(stderr, "thread create %d failed\n", i);
+			exit(1);
+		}
+	}
+
+	for (i = 0; i < nr_cpus; i++) {
+		if (pthread_join(thread[i], &retval)) {
+			fprintf(stderr, "thread join %d failed\n", i);
+			exit(1);
+		}
+	}
+	return 0;
+}
diff --git a/tests/benchmark/install b/tests/benchmark/install
new file mode 100755
index 0000000..a66405d
--- /dev/null
+++ b/tests/benchmark/install
@@ -0,0 +1,15 @@
+#!/bin/bash
+#
+# install ust
+
+# compile and install UST
+cd ../../
+make clean
+CFLAGS=-O3 ./configure
+make
+sudo make install
+sudo ldconfig
+
+# compile benchmark
+cd tests/benchmark
+make clean && make
diff --git a/tests/benchmark/run b/tests/benchmark/run
new file mode 100755
index 0000000..dfc1125
--- /dev/null
+++ b/tests/benchmark/run
@@ -0,0 +1,37 @@
+#!/bin/bash
+#
+# run ust benchmark
+#
+
+echo "ust benchmark"
+
+NR_EVENTS=2000000
+NR_CPUS=2
+echo "using $NR_CPUS processor(s)"
+echo "using $NR_EVENTS events per cpu"
+
+
+rm -f /tmp/bench.txt
+# without markers
+echo ">running without markers"
+t1=$(/usr/bin/time -f%e usttrace ./bench1 $NR_CPUS $NR_EVENTS 2>&1 1> /dev/null)
+echo " time=$t1 sec"
+
+
+rm -f /tmp/bench.txt
+# with markers
+echo ">running with markers activated"
+t2=$(/usr/bin/time -f%e usttrace ./bench2 $NR_CPUS $NR_EVENTS 2>&1 1> /dev/null)
+echo " time=$t2 sec"
+
+
+#penalty = t2 - t1
+echo
+penalty=$(echo "$t2 - $t1;" | bc)
+echo "time penalty=$penalty sec"
+
+#event = penalty / (nr_events * nr_cpus)
+event=$(echo "scale=8; ($penalty / ($NR_EVENTS * $NR_CPUS));" | bc)
+echo "time penalty per event=$event sec"
+
+rm -f /tmp/bench.txt
-- 
2.34.1