1 /* cpufreq-bench CPUFreq microbenchmark
3 * Copyright (C) 2008 Christian Kornacker <ckornacker@suse.de>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 #include <sys/utsname.h>
28 #include <sys/types.h>
35 * converts priority string to priority
37 * @param str string that represents a scheduler priority
40 * @retval SCHED_ERR when the priority doesn't exit
43 enum sched_prio string_to_prio(const char *str)
45 if (strncasecmp("high", str, strlen(str)) == 0)
47 else if (strncasecmp("default", str, strlen(str)) == 0)
49 else if (strncasecmp("low", str, strlen(str)) == 0)
56 * create and open logfile
58 * @param dir directory in which the logfile should be created
60 * @retval logfile on success
61 * @retval NULL when the file can't be created
64 FILE *prepare_output(const char *dirname)
69 struct utsname sysdata;
72 dir = opendir(dirname);
74 if (mkdir(dirname, 0755)) {
76 fprintf(stderr, "error: Cannot create dir %s\n",
82 len = strlen(dirname) + 30;
83 filename = malloc(sizeof(char) * len);
85 if (uname(&sysdata) == 0) {
86 len += strlen(sysdata.nodename) + strlen(sysdata.release);
87 filename = realloc(filename, sizeof(char) * len);
89 if (filename == NULL) {
94 snprintf(filename, len - 1, "%s/benchmark_%s_%s_%li.log",
95 dirname, sysdata.nodename, sysdata.release, time(NULL));
97 snprintf(filename, len - 1, "%s/benchmark_%li.log",
101 dprintf("logilename: %s\n", filename);
103 output = fopen(filename, "w+");
104 if (output == NULL) {
106 fprintf(stderr, "error: unable to open logfile\n");
109 fprintf(stdout, "Logfile: %s\n", filename);
112 fprintf(output, "#round load sleep performance powersave percentage\n");
117 * returns the default config
119 * @retval default config on success
120 * @retval NULL when the output file can't be created
123 struct config *prepare_default_config()
125 struct config *config = malloc(sizeof(struct config));
127 dprintf("loading defaults\n");
129 config->sleep = 500000;
130 config->load = 500000;
131 config->sleep_step = 500000;
132 config->load_step = 500000;
136 config->prio = SCHED_HIGH;
138 strncpy(config->governor, "ondemand", 8);
140 config->output = stdout;
142 #ifdef DEFAULT_CONFIG_FILE
143 if (prepare_config(DEFAULT_CONFIG_FILE, config))
150 * parses config file and returns the config to the caller
152 * @param path config file name
155 * @retval 0 on success
158 int prepare_config(const char *path, struct config *config)
161 char *opt, *val, *line = NULL;
162 FILE *configfile = fopen(path, "r");
164 if (config == NULL) {
165 fprintf(stderr, "error: config is NULL\n");
169 if (configfile == NULL) {
171 fprintf(stderr, "error: unable to read configfile\n");
176 while (getline(&line, &len, configfile) != -1) {
177 if (line[0] == '#' || line[0] == ' ')
180 sscanf(line, "%as = %as", &opt, &val);
182 dprintf("parsing: %s -> %s\n", opt, val);
184 if (strncmp("sleep", opt, strlen(opt)) == 0)
185 sscanf(val, "%li", &config->sleep);
187 else if (strncmp("load", opt, strlen(opt)) == 0)
188 sscanf(val, "%li", &config->load);
190 else if (strncmp("load_step", opt, strlen(opt)) == 0)
191 sscanf(val, "%li", &config->load_step);
193 else if (strncmp("sleep_step", opt, strlen(opt)) == 0)
194 sscanf(val, "%li", &config->sleep_step);
196 else if (strncmp("cycles", opt, strlen(opt)) == 0)
197 sscanf(val, "%u", &config->cycles);
199 else if (strncmp("rounds", opt, strlen(opt)) == 0)
200 sscanf(val, "%u", &config->rounds);
202 else if (strncmp("verbose", opt, strlen(opt)) == 0)
203 sscanf(val, "%u", &config->verbose);
205 else if (strncmp("output", opt, strlen(opt)) == 0)
206 config->output = prepare_output(val);
208 else if (strncmp("cpu", opt, strlen(opt)) == 0)
209 sscanf(val, "%u", &config->cpu);
211 else if (strncmp("governor", opt, 14) == 0)
212 strncpy(config->governor, val, 14);
214 else if (strncmp("priority", opt, strlen(opt)) == 0) {
215 if (string_to_prio(val) != SCHED_ERR)
216 config->prio = string_to_prio(val);