add memtrash, a background workload task

This is the old background workload task used for the synthetic experiments.

2 files changed, 30 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index eb09b1b..8a491d2 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,7 @@ vpath %.c bin/
 # ##############################################################################
 # Targets
 
-all = cache_cost
+all = cache_cost memthrash
 
 .PHONY: all clean
 all: ${all}
@@ -25,5 +25,8 @@ clean:
 obj-cache_cost = cache_cost.o
 cache_cost: ${obj-cache_cost}
 
+obj-memthrash  = memthrash.o
+memthrash: ${obj-memthrash}
+
 # dependency discovery
 include ${LIBLITMUS}/inc/depend.makefile
diff --git a/bin/memthrash.c b/bin/memthrash.c
new file mode 100644
index 0000000..9b2275b
--- /dev/null
+++ b/bin/memthrash.c
@@ -0,0 +1,26 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <time.h>
+
+#define NUM_VARS 5000000
+
+long data[NUM_VARS];
+
+int main(int argc, char** argv)
+{
+        int i;
+        long sum;
+        srand(time(NULL));
+        while (1) {
+                for (i = 0; i < NUM_VARS; i++)
+                        data[i] = rand();
+                sum = 0;
+                for (i = 0; i < NUM_VARS; i++)
+                        sum += (i % 2 ? 1 : -1) * data[i];
+                for (i = NUM_VARS - 1; i >= 0; i--)
+                        sum += (i % 2 ? -1 : 1) /  data[i];
+                if (argc > 1)
+                        printf("sum: %ld\n", sum);
+        }
+}