Start of another microbenchmark

e1944711 · Silas Boyd-Wickizer · 2c057f08 · e1944711 · e1944711 · e1944711
--- a/bin/Makefrag
+++ b/bin/Makefrag
@@ -38,7 +38,8 @@ UPROGS= \
 	wqtest \
 	rm \
 	avar \
-	schedbench
+	schedbench \
+        filebench
 ifeq ($(HAVE_LWIP),y)
 UPROGS += \

--- a/bin/filebench.cc
+++ b/bin/filebench.cc
+#if defined(LINUX)
+#include "user/util.h"
+#include <fcntl.h>
+#include <unistd.h>
+#include <assert.h>
+#define O_CREATE O_CREAT
+#define xfork() fork()
+#define xexit() exit(EXIT_SUCCESS)
+#else
+#include "types.h"
+#include "user.h"
+#include "fcntl.h"
+#define xfork() fork(0)
+#define xexit() exit()
+#endif
+#define CHUNKSZ 512
+#define FILESZ  (NCPU*CHUNKSZ)
+static const bool pinit = true;
+static char chunkbuf[CHUNKSZ];
+static void
+bench(int tid, int nloop)
+{
+  if (pinit)
+    setaffinity(tid);
+  int fd = open("filebenchx", O_RDONLY);
+  if (fd < 0)
+    die("open");
+  for (int i = 0; i < nloop; i++) {
+    ssize_t r;
+    r = pread(fd, chunkbuf, CHUNKSZ, CHUNKSZ*tid);
+    if (r != CHUNKSZ)
+      die("pread");
+  }
+  close(fd);
+  xexit();
+}
+int
+main(int ac, char **av)
+{
+  int nthread;
+  int nloop;
+#ifdef HW_qemu
+  nloop = 50;
+#else
+  nloop = 1000;
+#endif
+  if (ac < 2)
+    die("usage: %s nthreads [nloop]", av[0]);
+  nthread = atoi(av[1]);
+  if (ac > 2)
+    nloop = atoi(av[2]);
+  // Setup shared file
+  int fd = open("filebenchx", O_CREATE|O_WRONLY);
+  if (fd < 0)
+    die("open O_CREAT failed");
+  for (int i = 0; i < FILESZ; i += CHUNKSZ) {
+    int r = write(fd, chunkbuf, CHUNKSZ); 
+    if (r < CHUNKSZ)
+      die("write");
+  }
+  close(fd);
+  for (int i = 0; i < nthread; i++) {
+    int pid = xfork();
+    if (pid == 0)
+      bench(i, nloop);
+    else if (pid < 0)
+      die("fork");
+  }
+  return 0;
+}
--- a/user/Makefrag.bench
+++ b/user/Makefrag.bench
+NCXXFLAGS = -static -g -MD -m64 -O3 -Wall -Werror -DHW_$(HW) \
+	    -fno-builtin -fno-strict-aliasing -fno-omit-frame-pointer \
+	    -fms-extensions -mcx16 -mno-red-zone -std=c++0x \
+	    -Wno-sign-compare -fno-exceptions -fno-rtti -fcheck-new \
+	    -iquote . -iquote include \
+	    -include param.h -include include/compiler.h
+$(O)/user/%.o: user/%.cc
+	@echo "  CXX    $@"
+	$(Q)mkdir -p $(@D)
+	$(Q)$(CXX) -DLINUX $(NCXXFLAGS) -c -o $@ $<
+$(O)/user/%.o: bin/%.cc
+	@echo "  CXX    $@"
+	$(Q)mkdir -p $(@D)
+	$(Q)$(CXX) -DLINUX $(NCXXFLAGS) -c -o $@ $<
+$(O)/%: $(O)/user/%.o
+	@echo "  LD     $@"
+	$(Q)mkdir -p $(@D)
+	$(Q)$(CXX) -o $@ $^ -lpthread
+.PRECIOUS: $(O)/user/%.o
+-include $(O)/user/*.d
+ALL := $(O)/filebench
--- a/user/util.h
+++ b/user/util.h
 #include <stdio.h>
 #include <stdarg.h>
+#include <stdlib.h>
+#include <stdint.h>
 #include <errno.h>
 #include <string.h>
 #include <sched.h>