1 files changed, 52 insertions, 0 deletions
diff --git a/core/test_mmap.cpp b/core/test_mmap.cpp
new file mode 100644
index 0000000..9166521
--- /dev/null
+++ b/core/test_mmap.cpp
@@ -0,0 +1,52 @@
+#include <malloc.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+// how many mmap areas to create
+#define mapMax 100
+// how large should they be
+#define mapSize ((size_t)1024 * 1024 * 1024 * 100)
+
+int fd[mapMax];
+char name[mapMax][100];
+
+void quit(int ret) {
+  for (int i=0; i<mapMax; i++) {
+    //    close(fd[i]);
+    unlink(name[i]);
+  }
+  exit(ret);
+}
+
+int main() {
+  memset(name[0], 0, sizeof(name));
+
+  fprintf(stderr, "Allocating\t%f GB\t=\t%d\tx\t%f GB\n", ((double) mapMax * mapSize) / 1024.0 / 1024 / 1024, mapMax, (double) mapSize / 1024.0 / 1024 / 1024 );
+ 
+  // create tmp files
+  for (int i=0; i<mapMax; i++) {
+    tmpnam(name[i]);
+    fd[i] = open( name[i], O_CREAT | O_EXCL | O_RDWR, S_IRWXU );
+    if (fd[i] == -1) {
+      fprintf(stderr, "opening tmp file #%d failed\n", i);
+      quit(-1);
+    }
+  }
+
+  // mmap them
+  for (int i=0; i<mapMax; i++) {
+    if (MAP_FAILED == mmap((void*) NULL, mapSize, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_NONBLOCK, fd[i], 0)) {
+      fprintf(stderr, "mmap #%d failed (errno: %d, errstr: %s)\n", i, errno, strerror(errno));
+      quit(-1);
+    }
+  }
+
+  quit(0);
+}