-#if defined(HAVE_CLOCK_GETTIME) && defined(CLOCK_THREAD_CPUTIME_ID)
- // clock_gettime() gives us per-thread CPU time. It isn't
- // reliable on Linux, but it's the best we have.
- struct timespec ts;
- clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts);
- return (ts.tv_sec * TICKS_PER_SECOND +
- ((Ticks)ts.tv_nsec * TICKS_PER_SECOND) / 1000000000);
-#else
- return getProcessCPUTime();
+#if USE_PAPI
+ long long usec;
+ if ((usec = PAPI_get_virt_usec()) < 0) {
+ barf("PAPI_get_virt_usec: %lld", usec);
+ }
+ return ((usec * TICKS_PER_SECOND) / 1000000);
+
+#elif defined(HAVE_CLOCK_GETTIME) && defined (_POSIX_THREAD_CPUTIME) && defined(CLOCK_THREAD_CPUTIME_ID) && defined(HAVE_SYSCONF)
+ if (sysconf(_POSIX_THREAD_CPUTIME) != -1) {
+ // clock_gettime() gives us per-thread CPU time. It isn't
+ // reliable on Linux, but it's the best we have.
+ struct timespec ts;
+ int res;
+ res = clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts);
+ if (res == 0) {
+ return ((Ticks)ts.tv_sec * TICKS_PER_SECOND +
+ ((Ticks)ts.tv_nsec * TICKS_PER_SECOND) / 1000000000);
+ }
+ }