add tool for measuring cycles/sec

2 files changed, 29 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index ace3c0c..f558b9c 100644
--- a/Makefile
+++ b/Makefile
@@ -19,7 +19,7 @@ LIBS= ./liblitmus.a
 LIB_OBJ=  litmus.o syscalls.o sched_trace.o task.o kernel_iface.o
 
 TARGETS = run rt_launch liblitmus.a \
-          wait_test np_test stdump mode_test base_task base_mt_task release_ts
+          wait_test np_test stdump mode_test base_task base_mt_task release_ts cycles
 
 vpath %.h include/
 vpath %.c src/ bin/
@@ -55,6 +55,9 @@ release_ts: liblitmus.a litmus.h release_ts.o
 stdump: liblitmus.a litmus.h sched_trace.h stdump.o
         ${CC} ${CFLAGS} -o stdump  stdump.o ${LIBS}
 
+cycles: cycles.o
+        ${CC} ${CFLAGS} -o cycles cycles.o
+
 liblitmus.a:  ${LIB_OBJ} litmus.h
         ${AR} rcs liblitmus.a ${LIB_OBJ}
 
diff --git a/bin/cycles.c b/bin/cycles.c
new file mode 100644
index 0000000..4e5a078
--- /dev/null
+++ b/bin/cycles.c
@@ -0,0 +1,25 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "cycles.h"
+
+int main(int argc, char** argv)
+{
+        cycles_t t1, t2;
+        int secs = 1;
+        
+        if (argc > 1) {
+                secs = atoi(argv[1]);
+                if (secs <= 0)
+                        secs = 1;
+        }
+        while (1) {
+                t1 = get_cycles();
+                sleep(secs);
+                t2 = get_cycles();
+                t2 -= t1;
+                printf("%.2f/sec\n", t2 / (double) secs);
+        }
+        return 0;
+}