straceMalloc

commit debdd416af148e4fec8bc4f8aa37fe936917cd93
parent 77cb3738174ea8789494ccf65250db994e50be8c
Author: Remy Noulin <loader2x@gmail.com>
Date:   Tue, 30 Jan 2018 14:30:29 +0100

add accesses to malloc'd buffers

malloc.c | 37 ++++++++++++++++++++++++++++++-------
1 file changed, 30 insertions(+), 7 deletions(-)

Diffstat:
M
malloc.c
 | 
37
++++++++++++++++++++++++++++++-------

1 file changed, 30 insertions(+), 7 deletions(-)
diff --git a/malloc.c b/malloc.c
@@ -4,28 +4,51 @@
 
 int argc; char **argv;
 
+#define COUNT 16
+char *pointers[COUNT];
+
 int main(int ARGC, char** ARGV) {
 
   argc = ARGC; argv = ARGV;
 
-  puts("alloc");
+  puts("malloc");
   char *s;
   u64 start, end;
-  range(i, 16) {
+  range(i, COUNT) {
     start = getMonotonicTime();
     s = malloc((1<<i)*1024);
+    pointers[i] = s;
     end   = getMonotonicTime();
-    printf("%d %p size: %ldKB, time: %ldns\n", (int)i ,s, 1<<i, end-start);
+    printf("%d %p size: %dKB, time: %ldns\n", (int)i ,s, 1<<i, end-start);
   }
 
-  s[0] = 's';
-  s[1] = 0;
-  puts(s);
+  put
 
+  puts("alloca");
   range(i, 12) {
     start = getMonotonicTime();
     s = alloca((1<<i)*1024);
     end   = getMonotonicTime();
-    printf("alloca %d %p size: %ldKB, time: %ldns\n", (int)i ,s, 1<<i, end-start);
+    printf("alloca %d %p size: %dKB, time: %ldns\n", (int)i ,s, 1<<i, end-start);
+  }
+
+  put
+  puts("accesses in malloc");
+  start = getMonotonicTime();
+  range(i, COUNT) {
+    rangeStep(ix, (1<<i)*1024, 4096) {
+        pointers[i][ix] = '1';
+    }
+  }
+  end   = getMonotonicTime();
+  printf("1 - access malloc'd buffers - time: %ldms\n", (end-start)/1000000);
+
+  start = getMonotonicTime();
+  range(i, COUNT) {
+    rangeStep(ix, (1<<i)*1024, 4096) {
+        pointers[i][ix] = '1';
+    }
   }
+  end   = getMonotonicTime();
+  printf("2 - access malloc'd buffers - time: %ldms\n", (end-start)/1000000);
 }