just concurrent map/unmap

2b3ba5b1 · Frans Kaashoek · 589f4656 · 2b3ba5b1
--- a/mapbench.c
+++ b/mapbench.c
@@ -8,6 +8,7 @@
 static struct uspinlock l;
 static volatile uint tcount;
 enum { nthread = 4 };
+enum { readaccess = 0 };
 void
 thr(uint tid)
@@ -19,8 +20,10 @@ thr(uint tid)
      exit();
    }
-    for (uint j = 0; j < 8 * 4096; j++)
+    if (readaccess) {
-      p[j] = '\0';
+      for (uint j = 0; j < 8 * 4096; j++)
+	p[j] = '\0';
+    }
    if (unmap((void *) p, 8 * 4096) < 0) {
      printf(1, "%d: unmap failed\n", tid);