Add perf test for spawn+wait4

src/libos/src/syscall/mod.rs

@@ -462,7 +462,9 @@ pub extern "C" fn occlum_exit(status: i32)
 #[no_mangle]
 pub extern "C" fn occlum_unknown(num: u32)
 {
-    println!("[WARNING] Unknown syscall (num = {})", num);
+    if cfg!(debug_assertions) {
+        //println!("[WARNING] Unknown syscall (num = {})", num);
+    }
 }
 
 #[no_mangle]

src/libos/src/vm/process_vm.rs

@@ -1,5 +1,7 @@
 use super::*;
 
+// TODO: examine the ProcessVM code for memory leakage
+
 lazy_static! {
     static ref DATA_SPACE: SgxMutex<VMSpace> = {
         let (addr, size) = {

src/libos/src/vm/vm_range.rs

@@ -372,9 +372,11 @@ impl PartialEq for VMRange {
 impl Drop for VMRange {
     fn drop(&mut self) {
         if !self.is_dealloced() {
+            println!("VMRange::drop::panic1");
             panic!("A range must be dealloc'ed before drop");
         }
         if self.has_subranges() {
+            println!("VMRange::drop::panic2");
             panic!("All sub-ranges must be removed explicitly before drop");
         }
     }

src/libos/src/vm/vm_space_prealloced.c

@@ -1,6 +1,6 @@
 #include <stddef.h>
 
-#define DATA_SPACE_SIZE (16*1024*1024)
+#define DATA_SPACE_SIZE (32*1024*1024)
 
 static char __prealloced_data_space[DATA_SPACE_SIZE]
     __attribute__ ((

test/Makefile

@@ -1,7 +1,14 @@
 CUR_DIR := $(shell dirname $(realpath $(lastword $(MAKEFILE_LIST))))
 PROJECT_DIR := $(realpath $(CUR_DIR)/../)
 
+# Whether test performance or not?
+PERF = yes
+
+ifeq ($(PERF),no)
 TEST_SUITES := empty argv hello_world malloc file getpid spawn pipe time
+else
+TEST_SUITES := empty perf_spawn_and_wait4
+endif
 BUILD_TEST_SUITES := $(TEST_SUITES:%=%)
 RUN_TEST_SUITES := $(TEST_SUITES:%=test-%)
 CLEAN_TEST_SUITES := $(TEST_SUITES:%=clean-%)

test/perf_spawn_and_wait4/Makefile

@@ -0,0 +1,5 @@
+include ../test_common.mk
+
+EXTRA_C_FLAGS :=
+EXTRA_LINK_FLAGS :=
+BIN_ARGS :=

test/perf_spawn_and_wait4/main.c

@@ -0,0 +1,36 @@
+#include <sys/syscall.h>
+#include <sys/wait.h>
+#include <sys/time.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <spawn.h>
+
+#define NREPEATS 5000
+
+int main(int argc, const char* argv[]) {
+    struct timeval tv_start, tv_end;
+
+    gettimeofday(&tv_start, NULL);
+    for (unsigned long i = 0; i < NREPEATS; i++) {
+        int child_pid, status;
+        if (posix_spawn(&child_pid, "empty/bin.encrypted", NULL, NULL, NULL, NULL) <0) {
+            printf("ERROR: failed to spawn (# of repeats = %lu)\n", i);
+            return -1;
+        }
+        if (wait4(-1, &status, 0, NULL) < 0) {
+            printf("ERROR: failed to wait4 (# of repeats = %lu)\n", i);
+            return -1;
+        }
+        if (status != 0) {
+            printf("ERROR: child process exits with error\n");
+            return -1;
+        }
+    }
+    gettimeofday(&tv_end, NULL);
+
+    suseconds_t total_us = (tv_end.tv_sec - tv_start.tv_sec) * 1000000UL +
+                         + (tv_end.tv_usec - tv_start.tv_usec);
+    suseconds_t latency = total_us / NREPEATS;
+    printf("Latency of spawn/exit = %lu us\n", latency);
+    return 0;
+}