131 строка
3.5 KiB
C
131 строка
3.5 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University.
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* All rights reserved.
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* Copyright (c) 2004-2005 The Trustees of the University of Tennessee.
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* All rights reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#include "ompi_config.h"
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#include "opal/mca/timer/timer.h"
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#include "opal/mca/timer/linux/timer_linux.h"
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#include "opal/include/constants.h"
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opal_timer_t opal_timer_linux_freq;
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static int opal_timer_linux_open(void);
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const opal_timer_base_component_1_0_0_t mca_timer_linux_component = {
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/* First, the mca_component_t struct containing meta information
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about the component itself */
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{
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/* Indicate that we are a timer v1.0.0 component (which also
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implies a specific MCA version) */
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OPAL_TIMER_BASE_VERSION_1_0_0,
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/* Component name and version */
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"linux",
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OPAL_MAJOR_VERSION,
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OPAL_MINOR_VERSION,
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OPAL_RELEASE_VERSION,
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/* Component open and close functions */
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opal_timer_linux_open,
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NULL
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},
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/* Next the MCA v1.0.0 component meta data */
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{
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/* Whether the component is checkpointable or not */
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true
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},
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};
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static char *
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find_info(FILE* fp, char *str, char *buf, size_t buflen)
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{
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char *tmp;
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rewind(fp);
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while (NULL != fgets(buf, 1024, fp)) {
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if (strncmp(buf, str, strlen(str)) == 0) {
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/* we found the line. Now eat everything up to,
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including, and one past the : */
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for (tmp = buf ; (*tmp != '\0') && (*tmp != ':') ; ++tmp) ;
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for ( ++tmp ; *tmp == ' ' ; ++tmp);
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if (NULL != tmp && '\0' != *tmp) {
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return tmp;
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}
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}
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}
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return NULL;
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}
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int
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opal_timer_linux_open(void)
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{
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FILE *fp;
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char *loc;
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float cpu_f;
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int ret;
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char buf[1024];
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fp = fopen("/proc/cpuinfo", "r");
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if (NULL == fp) {
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return OPAL_ERR_IN_ERRNO;
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}
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opal_timer_linux_freq = 0;
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if (0 == opal_timer_linux_freq) {
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/* first, look for a timebase field. probably only on PPC,
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but one never knows */
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loc = find_info(fp, "timebase", buf, 1024);
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if (NULL != loc) {
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int freq;
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ret = sscanf(loc, "%d", &freq);
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if (1 == ret) {
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opal_timer_linux_freq = freq;
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}
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}
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}
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if (0 == opal_timer_linux_freq) {
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/* find the CPU speed - most timers are 1:1 with CPU speed */
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loc = find_info(fp, "cpu MHz", buf, 1024);
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if (NULL != loc) {
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ret = sscanf(loc, "%f", &cpu_f);
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if (1 == ret) {
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/* numer is in MHz - convert to Hz and make an integer */
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opal_timer_linux_freq = (opal_timer_t) cpu_f * 1000000;
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}
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}
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}
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if (0 == opal_timer_linux_freq) {
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/* look for the sparc way of getting cpu frequency */
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loc = find_info(fp, "Cpu0ClkTck", buf, 1024);
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if (NULL != loc) {
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unsigned int freq;
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ret = sscanf(loc, "%x", &freq);
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if (1 == ret) {
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opal_timer_linux_freq = freq;
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}
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}
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}
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fclose(fp);
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return OPAL_SUCCESS;
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}
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