* Copyright 2008-2009, Ingo Weinhold, ingo_weinhold@gmx.de.
* Distributed under the terms of the MIT License.
*/
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include <OS.h>
#include "time_stats.h"
#define SCHEDULING_ANALYSIS_BUFFER_SIZE 10 * 1024 * 1024
extern const char* __progname;
static const char* kUsage =
"Usage: %s [ <options> ] <command line>\n"
"Executes the given command line <command line> and print an analysis of\n"
"the user and kernel times of all threads that ran during that time.\n"
"\n"
"Options:\n"
" -b <size> - When doing scheduling analysis: the size of the buffer\n"
" used (in MB)\n"
" -h, --help - Print this usage info.\n"
" -o <output> - Print the results to file <output>.\n"
" -s - Also perform a scheduling analysis over the time the\n"
" child process ran. This requires that scheduler kernel\n"
" tracing had been enabled at compile time.\n"
;
static void
print_usage_and_exit(bool error)
{
fprintf(error ? stderr : stdout, kUsage, __progname);
exit(error ? 1 : 0);
}
int
main(int argc, const char* const* argv)
{
const char* outputFile = NULL;
bool schedulingAnalysis = false;
size_t bufferSize = SCHEDULING_ANALYSIS_BUFFER_SIZE;
while (true) {
static struct option sLongOptions[] = {
{ "help", no_argument, 0, 'h' },
{ "output", required_argument, 0, 'o' },
{ 0, 0, 0, 0 }
};
opterr = 0;
int c = getopt_long(argc, (char**)argv, "+b:ho:s", sLongOptions, NULL);
if (c == -1)
break;
switch (c) {
case 'b':
bufferSize = atol(optarg);
if (bufferSize < 1 || bufferSize > 1024) {
fprintf(stderr, "Error: Invalid buffer size. Should be "
"between 1 and 1024 MB\n");
exit(1);
}
bufferSize *= 1024 * 1024;
break;
case 'h':
print_usage_and_exit(false);
break;
case 'o':
outputFile = optarg;
break;
case 's':
schedulingAnalysis = true;
break;
default:
print_usage_and_exit(true);
break;
}
}
if (optind >= argc)
print_usage_and_exit(true);
int outFD = -1;
if (outputFile != NULL) {
outFD = open(outputFile, O_WRONLY | O_CREAT | O_TRUNC,
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP| S_IROTH | S_IWOTH);
if (outFD < 0) {
fprintf(stderr, "Error: Failed to open \"%s\": %s\n", outputFile,
strerror(errno));
exit(1);
}
}
do_timing_analysis(argc - optind, argv + optind, schedulingAnalysis, outFD,
bufferSize);
return 0;
}
