352 lines
8.2 KiB
C
352 lines
8.2 KiB
C
char netcpu_perfstat_id[]="\
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@(#)netcpu_perfstat.c Version 2.4.0";
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdio.h>
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#if HAVE_INTTYPES_H
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# include <inttypes.h>
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#else
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# if HAVE_STDINT_H
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# include <stdint.h>
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# endif
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#endif
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#if TIME_WITH_SYS_TIME
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# include <sys/time.h>
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# include <time.h>
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#else
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# if HAVE_SYS_TIME_H
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# include <sys/time.h>
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# else
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# include <time.h>
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# endif
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#endif
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#if HAVE_LIMITS_H
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# include <limits.h>
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# ifndef LONG_LONG_MAX
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# define LONG_LONG_MAX LLONG_MAX
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# endif /* LONG_LONG_MAX */
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#endif
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#include <errno.h>
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#include "netsh.h"
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#include "netlib.h"
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/* the lib_start_count and lib_end_count arrays hold the starting
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and ending values of whatever is counting when the system is
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idle. The rate at which this increments during a test is compared
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with a previous calibration to arrive at a CPU utilization
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percentage. raj 2005-01-26 */
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static uint64_t lib_start_count[MAXCPUS];
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static uint64_t lib_end_count[MAXCPUS];
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void
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cpu_util_init(void)
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{
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return;
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}
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void
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cpu_util_terminate(void)
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{
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return;
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}
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int
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get_cpu_method(void)
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{
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return PERFSTAT;
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}
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void
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get_cpu_idle(uint64_t *res)
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{
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perfstat_cpu_t *perfstat_buffer;
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perfstat_cpu_t *per_cpu_pointer;
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perfstat_id_t name;
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int i,ret;
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/* a name of "" will cause us to start from the beginning */
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strcpy(name.name,"");
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perfstat_buffer = (perfstat_cpu_t *)malloc(lib_num_loc_cpus *
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sizeof(perfstat_cpu_t));
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if (perfstat_buffer == NULL) {
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fprintf(where,
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"cpu_start: malloc failed errno %d\n",
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errno);
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fflush(where);
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exit(-1);
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}
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/* happiness and joy, keep going */
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ret = perfstat_cpu(&name,
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perfstat_buffer,
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sizeof(perfstat_cpu_t),
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lib_num_loc_cpus);
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if ((ret == -1) ||
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(ret != lib_num_loc_cpus)) {
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fprintf(where,
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"cpu_start: perfstat_cpu failed/count off; errno %d cpus %d count %d\n",
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errno,
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lib_num_loc_cpus,
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ret);
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fflush(where);
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exit(-1);
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}
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per_cpu_pointer = perfstat_buffer;
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for (i = 0; i < lib_num_loc_cpus; i++){
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res[i] = per_cpu_pointer->idle;
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per_cpu_pointer++;
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}
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free(perfstat_buffer);
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return;
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}
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float
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calibrate_idle_rate(int iterations, int interval)
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{
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unsigned long long
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firstcnt[MAXCPUS],
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secondcnt[MAXCPUS];
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float
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elapsed,
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temp_rate,
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rate[MAXTIMES],
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local_maxrate;
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long
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sec,
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usec;
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int
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i,
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j;
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struct timeval time1, time2 ;
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struct timezone tz;
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perfstat_cpu_t *perfstat_buffer;
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perfstat_cpu_t *per_cpu_pointer;
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perfstat_id_t name;
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int ret;
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if (debug) {
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fprintf(where,"enter calibrate_perfstat\n");
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fflush(where);
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}
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if (iterations > MAXTIMES) {
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iterations = MAXTIMES;
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}
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local_maxrate = (float)-1.0;
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perfstat_buffer = (perfstat_cpu_t *)malloc(lib_num_loc_cpus *
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sizeof(perfstat_cpu_t));
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if (perfstat_buffer == NULL) {
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fprintf(where,
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"calibrate_perfstat: malloc failed errno %d\n",
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errno);
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fflush(where);
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exit(-1);
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}
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for(i = 0; i < iterations; i++) {
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rate[i] = (float)0.0;
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/* a name of "" will cause us to start from the beginning */
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strcpy(name.name,"");
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/* happiness and joy, keep going */
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ret = perfstat_cpu(&name,
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perfstat_buffer,
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sizeof(perfstat_cpu_t),
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lib_num_loc_cpus);
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if ((ret == -1) ||
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(ret != lib_num_loc_cpus)) {
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fprintf(where,
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"calibrate_perfstat: perfstat_cpu failed/count off; errno %d cpus %d count %d\n",
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errno,
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lib_num_loc_cpus,
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ret);
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fflush(where);
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exit(-1);
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}
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per_cpu_pointer = perfstat_buffer;
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for (j = 0; j < lib_num_loc_cpus; j++) {
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firstcnt[j] = per_cpu_pointer->idle;
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per_cpu_pointer++;
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}
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gettimeofday (&time1, &tz);
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sleep(interval);
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gettimeofday (&time2, &tz);
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if (time2.tv_usec < time1.tv_usec)
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{
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time2.tv_usec += 1000000;
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time2.tv_sec -=1;
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}
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sec = time2.tv_sec - time1.tv_sec;
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usec = time2.tv_usec - time1.tv_usec;
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elapsed = (float)sec + ((float)usec/(float)1000000.0);
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/* happiness and joy, keep going */
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ret = perfstat_cpu(&name,
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perfstat_buffer,
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sizeof(perfstat_cpu_t),
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lib_num_loc_cpus);
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if ((ret == -1) ||
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(ret != lib_num_loc_cpus)) {
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fprintf(where,
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"calibrate_perfstat: perfstat_cpu failed/count off; errno %d cpus %d count %d\n",
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errno,
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lib_num_loc_cpus,
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ret);
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fflush(where);
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exit(-1);
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}
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per_cpu_pointer = perfstat_buffer;
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if(debug) {
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fprintf(where, "Calibration for perfstat counter run: %d\n",i);
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fprintf(where,"\tsec = %ld usec = %ld\n",sec,usec);
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fprintf(where,"\telapsed time = %g\n",elapsed);
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}
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for (j = 0; j < lib_num_loc_cpus; j++) {
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secondcnt[j] = per_cpu_pointer->idle;
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per_cpu_pointer++;
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if(debug) {
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/* I know that there are situations where compilers know about */
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/* long long, but the library functions do not... raj 4/95 */
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fprintf(where,
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"\tfirstcnt[%d] = 0x%8.8lx%8.8lx secondcnt[%d] = 0x%8.8lx%8.8lx\n",
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j,
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firstcnt[j],
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firstcnt[j],
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j,
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secondcnt[j],
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secondcnt[j]);
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}
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/* we assume that it would wrap no more than once. we also */
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/* assume that the result of subtracting will "fit" raj 4/95 */
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temp_rate = (secondcnt[j] >= firstcnt[j]) ?
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(float)(secondcnt[j] - firstcnt[j])/elapsed :
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(float)(secondcnt[j]-firstcnt[j]+MAXLONG)/elapsed;
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if (temp_rate > rate[i]) rate[i] = temp_rate;
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if(debug) {
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fprintf(where,"\trate[%d] = %g\n",i,rate[i]);
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fflush(where);
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}
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if (local_maxrate < rate[i]) local_maxrate = rate[i];
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}
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}
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if(debug) {
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fprintf(where,"\tlocal maxrate = %g per sec. \n",local_maxrate);
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fflush(where);
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}
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free(perfstat_buffer);
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return local_maxrate;
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}
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float
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calc_cpu_util_internal(float elapsed_time)
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{
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int i;
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float actual_rate;
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float correction_factor;
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lib_local_cpu_util = (float)0.0;
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/* It is possible that the library measured a time other than */
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/* the one that the user want for the cpu utilization */
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/* calculations - for example, tests that were ended by */
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/* watchdog timers such as the udp stream test. We let these */
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/* tests tell up what the elapsed time should be. */
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if (elapsed_time != 0.0) {
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correction_factor = (float) 1.0 +
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((lib_elapsed - elapsed_time) / elapsed_time);
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}
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else {
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correction_factor = (float) 1.0;
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}
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/* this looks just like the looper case. at least I think it */
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/* should :) raj 4/95 */
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for (i = 0; i < lib_num_loc_cpus; i++) {
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/* we assume that the two are not more than a long apart. I */
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/* know that this is bad, but trying to go from long longs to */
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/* a float (perhaps a double) is boggling my mind right now. */
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/* raj 4/95 */
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long long
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diff;
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if (lib_end_count[i] >= lib_start_count[i]) {
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diff = lib_end_count[i] - lib_start_count[i];
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}
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else {
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diff = lib_end_count[i] - lib_start_count[i] + LONG_LONG_MAX;
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}
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actual_rate = (float) diff / lib_elapsed;
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lib_local_per_cpu_util[i] = (lib_local_maxrate - actual_rate) /
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lib_local_maxrate * 100;
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lib_local_cpu_util += lib_local_per_cpu_util[i];
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if (debug) {
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fprintf(where,
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"calc_cpu_util: actual_rate on cpu %d is %g max_rate %g cpu %6.2f\n",
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i,
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actual_rate,
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lib_local_maxrate,
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lib_local_per_cpu_util[i]);
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}
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}
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/* we want the average across all n processors */
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lib_local_cpu_util /= (float)lib_num_loc_cpus;
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if (debug) {
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fprintf(where,
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"calc_cpu_util: average across CPUs is %g\n",lib_local_cpu_util);
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}
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lib_local_cpu_util *= correction_factor;
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if (debug) {
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fprintf(where,
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"calc_cpu_util: returning %g\n",lib_local_cpu_util);
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}
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return lib_local_cpu_util;
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}
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void
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cpu_start_internal(void)
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{
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get_cpu_idle(lib_start_count);
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return;
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}
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void
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cpu_stop_internal(void)
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{
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get_cpu_idle(lib_end_count);
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}
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