directory lookup workload, with separate dirs for now

278654b6 · Nickolai Zeldovich · 50dfd90f · 278654b6 · 278654b6
--- a/Makefile
+++ b/Makefile
@@ -184,6 +184,7 @@ UPROGS=\
 	_forktree\
 	_forkexectree\
 	_mapbench\
+	_dirbench\
 fs.img: mkfs README $(UPROGS)
 	./mkfs fs.img README $(UPROGS)

--- a/dirbench.c
+++ b/dirbench.c
+#include "types.h"
+#include "stat.h"
+#include "user.h"
+#include "xv6-mtrace.h"
+#include "x86.h"
+#include "param.h"
+#include "fcntl.h"
+enum { nthread = 2 };
+enum { nfile = 10 };
+enum { nlookup = 1000 };
+char dirs[nthread][MAXNAME];
+void
+bench(uint tid)
+{
+  char pn[MAXNAME];
+  for (uint i = 0; i < nfile; i++) {
+    snprintf(pn, sizeof(pn), "%s/f:%d:%d", dirs[tid], tid, i);
+    int fd = open(pn, O_CREATE | O_RDWR);
+    if (fd < 0)
+      printf(1, "create failed");
+    close(fd);
+  }
+  for (uint i = 0; i < nlookup; i++) {
+    snprintf(pn, sizeof(pn), "%s/f:%d:%d", dirs[tid], tid, (i % nfile));
+    int fd = open(pn, O_RDWR);
+    if (fd < 0)
+      printf(1, "open failed");
+    close(fd);
+  }
+  exit();
+}
+int
+main(void)
+{
+  for (uint i = 0; i < nthread; i++) {
+    snprintf(dirs[i], sizeof(dirs[i]), "/db%d", i);
+    if (mkdir(dirs[i]) < 0)
+      printf(1, "mkdir failed");
+  }
+  mtrace_enable_set(1, "xv6-dirbench");
+  printf(1, "dirbench[%d]: start\n", getpid());
+  for(uint i = 0; i < nthread; i++) {
+    int pid = fork(0);
+    if (pid == 0)
+      bench(i);
+  }
+  for (uint i = 0; i < nthread; i++)
+    wait();
+  mtrace_enable_set(0, "xv6-dirbench");
+  printf(1, "dirbench[%d]: done\n", getpid());
+  halt();
+  exit();
+}