Added test program "time_stats" which is a "time" on steroids. It prints

not only the times for the child process, but also for all other
threads. Gives some more insight into what was going on in the system.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27249 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/tests/system/kernel/Jamfile

@@ -45,6 +45,8 @@ SetSupportedPlatformsForTarget syscall_time
 	: $(HAIKU_BEOS_COMPATIBLE_PLATFORMS) ;
 SimpleTest syscall_time : syscall_time.cpp ;
 
+SimpleTest time_stats : time_stats.cpp ;
+
 SimpleTest transfer_area_test : transfer_area_test.cpp ;
 
 SimpleTest wait_test_1 : wait_test_1.c ;

src/tests/system/kernel/time_stats.cpp

@@ -0,0 +1,190 @@
+/*
+ * Copyright 2008, Ingo Weinhold, [email protected].
+ * Distributed under the terms of the MIT License.
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include <algorithm>
+
+#include <OS.h>
+
+
+#define MAX_THREADS	4096
+
+
+struct UsageInfoThreadComparator {
+	inline bool operator()(const thread_info& a, const thread_info& b)
+	{
+		return a.thread < b.thread;
+	}
+};
+
+
+struct UsageInfoTimeComparator {
+	inline bool operator()(const thread_info& a, const thread_info& b)
+	{
+		return a.user_time + a.kernel_time > b.user_time + b.kernel_time;
+	}
+};
+
+
+static int32
+get_usage_infos(thread_info* infos)
+{
+	int32 count = 0;
+
+	int32 teamCookie = 0;
+	team_info teamInfo;
+	while (get_next_team_info(&teamCookie, &teamInfo) == B_OK) {
+		int32 threadCookie = 0;
+		while (get_next_thread_info(teamInfo.team, &threadCookie, &infos[count])
+				== B_OK) {
+			count++;
+		}
+	}
+
+	return count;
+}
+
+
+int
+main(int argc, const char* const* argv)
+{
+	if (argc < 2) {
+		fprintf(stderr, "Usage:...\n");
+		exit(1);
+	}
+
+	// gather initial usage info
+	thread_info initialUsage[MAX_THREADS];
+	int32 initialUsageCount = get_usage_infos(initialUsage);
+
+	// fork
+	bigtime_t startTime = system_time();
+	pid_t child = fork();
+	if (child < 0) {
+		fprintf(stderr, "fork() failed: %s\n", strerror(errno));
+		exit(1);
+	}
+
+	// exec child process
+	if (child == 0) {
+		execvp(argv[1], (char**)(argv + 1));
+		exit(1);
+	}
+
+	// wait for child
+	int childStatus;
+	while (wait(&childStatus) < 0);
+
+	// get child usage info
+	bigtime_t runTime = system_time() - startTime;
+	team_usage_info childUsage;
+	get_team_usage_info(B_CURRENT_TEAM, B_TEAM_USAGE_CHILDREN, &childUsage);
+
+	// gather final usage info
+	thread_info finalUsage[MAX_THREADS];
+	int32 finalUsageCount = get_usage_infos(finalUsage);
+
+	// sort the infos, so we can compare them better
+	std::sort(initialUsage, initialUsage + initialUsageCount,
+		UsageInfoThreadComparator());
+	std::sort(finalUsage, finalUsage + finalUsageCount,
+		UsageInfoThreadComparator());
+
+	// compute results
+
+	thread_info sortedThreads[MAX_THREADS];
+	int32 sortedThreadCount = 0;
+	thread_info goneThreads[MAX_THREADS];
+	int32 goneThreadCount = 0;
+
+	// child
+	sortedThreads[0].thread = child;
+	sortedThreads[0].user_time = childUsage.user_time;
+	sortedThreads[0].kernel_time = childUsage.kernel_time;
+	strlcpy(sortedThreads[0].name, "<child>", sizeof(sortedThreads[0].name));
+	sortedThreadCount++;
+
+	// other threads
+	int32 initialI = 0;
+	int32 finalI = 0;
+	while (initialI < initialUsageCount || finalI < finalUsageCount) {
+		if (initialI >= initialUsageCount
+			|| finalI < finalUsageCount
+				&& initialUsage[initialI].thread > finalUsage[finalI].thread) {
+			// new thread
+			memcpy(&sortedThreads[sortedThreadCount], &finalUsage[finalI],
+				sizeof(thread_info));
+			sortedThreadCount++;
+			finalI++;
+			continue;
+		}
+
+		if (finalI >= finalUsageCount
+			|| initialI < initialUsageCount
+				&& initialUsage[initialI].thread < finalUsage[finalI].thread) {
+			// gone thread
+			memcpy(&goneThreads[goneThreadCount], &initialUsage[initialI],
+				sizeof(thread_info));
+			goneThreadCount++;
+			initialI++;
+			continue;
+		}
+
+		// thread is still there
+		memcpy(&sortedThreads[sortedThreadCount], &finalUsage[finalI],
+			sizeof(thread_info));
+		sortedThreads[sortedThreadCount].user_time
+			-= initialUsage[initialI].user_time;
+		sortedThreads[sortedThreadCount].kernel_time
+			-= initialUsage[initialI].kernel_time;
+		sortedThreadCount++;
+		initialI++;
+		finalI++;
+	}
+
+	// sort results
+	std::sort(sortedThreads, sortedThreads + sortedThreadCount,
+		UsageInfoTimeComparator());
+
+	// print results
+	printf("\nTotal run time: %lld us\n", runTime);
+	printf("Thread time statistics in us:\n\n");
+	printf(" thread  name                                  kernel        user  "
+		"     total    in %\n");
+	printf("-------------------------------------------------------------------"
+		"------------------\n");
+
+	for (int32 i = 0; i < sortedThreadCount; i++) {
+		const thread_info& info = sortedThreads[i];
+		if (info.user_time + info.kernel_time == 0)
+			break;
+
+		bool highlight = info.thread == child && isatty(STDOUT_FILENO);
+
+		if (highlight)
+			printf("\033[1m");
+
+		bigtime_t total = info.user_time + info.kernel_time;
+		printf("%7ld  %-32s  %10lld  %10lld  %10lld  %6.2f\n", info.thread,
+			info.name, info.user_time, info.kernel_time, total,
+			(double)total / runTime * 100);
+
+		if (highlight)
+			printf("\033[m");
+	}
+
+	for (int32 i = 0; i < goneThreadCount; i++) {
+		const thread_info& info = goneThreads[i];
+		printf("%7ld  %-32s  <gone>\n", info.thread, info.name);
+	}
+
+	return 0;
+}