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", dirname, time(NULL));
100 dprintf("logilename: %s\n", filename);
102 if ((output = fopen(filename, "w+")) == NULL) {
104 fprintf(stderr, "error: unable to open logfile\n");
107 fprintf(stdout, "Logfile: %s\n", filename);
110 fprintf(output, "#round load sleep performance powersave percentage\n");
115 * returns the default config
117 * @retval default config on success
118 * @retval NULL when the output file can't be created
121 struct config *prepare_default_config()
123 struct config *config = malloc(sizeof(struct config));
125 dprintf("loading defaults\n");
127 config->sleep = 500000;
128 config->load = 500000;
129 config->sleep_step = 500000;
130 config->load_step = 500000;
134 config->prio = SCHED_HIGH;
136 strncpy(config->governor, "ondemand", 8);
138 config->output = stdout;
140 #ifdef DEFAULT_CONFIG_FILE
141 if (prepare_config(DEFAULT_CONFIG_FILE, config))
148 * parses config file and returns the config to the caller
150 * @param path config file name
153 * @retval 0 on success
156 int prepare_config(const char *path, struct config *config)
159 char *opt, *val, *line = NULL;
160 FILE *configfile = fopen(path, "r");
162 if (config == NULL) {
163 fprintf(stderr, "error: config is NULL\n");
167 if (configfile == NULL) {
169 fprintf(stderr, "error: unable to read configfile\n");
174 while (getline(&line, &len, configfile) != -1)
176 if (line[0] == '#' || line[0] == ' ')
179 sscanf(line, "%as = %as", &opt, &val);
181 dprintf("parsing: %s -> %s\n", opt, val);
183 if (strncmp("sleep", opt, strlen(opt)) == 0)
184 sscanf(val, "%li", &config->sleep);
186 else if (strncmp("load", opt, strlen(opt)) == 0)
187 sscanf(val, "%li", &config->load);
189 else if (strncmp("load_step", opt, strlen(opt)) == 0)
190 sscanf(val, "%li", &config->load_step);
192 else if (strncmp("sleep_step", opt, strlen(opt)) == 0)
193 sscanf(val, "%li", &config->sleep_step);
195 else if (strncmp("cycles", opt, strlen(opt)) == 0)
196 sscanf(val, "%u", &config->cycles);
198 else if (strncmp("rounds", opt, strlen(opt)) == 0)
199 sscanf(val, "%u", &config->rounds);
201 else if (strncmp("verbose", opt, strlen(opt)) == 0)
202 sscanf(val, "%u", &config->verbose);
204 else if (strncmp("output", opt, strlen(opt)) == 0)
205 config->output = prepare_output(val);
207 else if (strncmp("cpu", opt, strlen(opt)) == 0)
208 sscanf(val, "%u", &config->cpu);
210 else if (strncmp("governor", opt, 14) == 0)
211 strncpy(config->governor, val, 14);
213 else if (strncmp("priority", opt, strlen(opt)) == 0) {
214 if (string_to_prio(val) != SCHED_ERR)
215 config->prio = string_to_prio(val);