mirror of
https://github.com/tobast/libunwind-eh_elf.git
synced 2024-12-25 04:23:42 +01:00
5e446b24d7
(maxlevel): New global variable. (measure_unwind): Return init/step times via arg pointers. (f1): Pass through init/step pointers. (doit): New function. (main): Use doit() instead of open code. (Logical change 1.130)
120 lines
2.4 KiB
C
120 lines
2.4 KiB
C
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
#include <sys/time.h>
|
|
|
|
#include <libunwind.h>
|
|
|
|
#define ITERATIONS 10000
|
|
|
|
#define panic(args...) \
|
|
do { fprintf (stderr, args); exit (-1); } while (0)
|
|
|
|
static int maxlevel = 100;
|
|
|
|
static inline double
|
|
gettime (void)
|
|
{
|
|
struct timeval tv;
|
|
|
|
gettimeofday(&tv, NULL);
|
|
return tv.tv_sec + 1e-6*tv.tv_usec;
|
|
}
|
|
|
|
static int
|
|
measure_unwind (int maxlevel, double *init, double *step)
|
|
{
|
|
double stop, mid, start;
|
|
unw_cursor_t cursor;
|
|
unw_context_t uc;
|
|
int ret, level = 0;
|
|
|
|
start = gettime ();
|
|
|
|
unw_getcontext (&uc);
|
|
if (unw_init_local (&cursor, &uc) < 0)
|
|
panic ("unw_init_local() failed\n");
|
|
|
|
mid = gettime ();
|
|
|
|
do
|
|
{
|
|
ret = unw_step (&cursor);
|
|
if (ret < 0)
|
|
panic ("unw_step() failed\n");
|
|
++level;
|
|
}
|
|
while (ret > 0);
|
|
|
|
stop = gettime ();
|
|
|
|
if (level <= maxlevel)
|
|
panic ("Unwound only %d levels, expected at least %d levels",
|
|
level, maxlevel);
|
|
|
|
*init = mid - start;
|
|
*step = (stop - mid) / (double) level;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
f1 (int level, int maxlevel, double *init, double *step)
|
|
{
|
|
if (level == maxlevel)
|
|
return measure_unwind (maxlevel, init, step);
|
|
else
|
|
/* defeat last-call/sibcall optimization */
|
|
return f1 (level + 1, maxlevel, init, step) + level;
|
|
}
|
|
|
|
static void
|
|
doit (const char *label)
|
|
{
|
|
double init, step, min_init, first_init, min_step, first_step, sum_init, sum_step;
|
|
int i;
|
|
|
|
sum_init = sum_step = first_init = first_step = 0.0;
|
|
min_init = min_step = 1e99;
|
|
for (i = 0; i < ITERATIONS; ++i)
|
|
{
|
|
f1 (0, maxlevel, &init, &step);
|
|
|
|
sum_init += init;
|
|
sum_step += step;
|
|
|
|
if (init < min_init)
|
|
min_init = init;
|
|
if (step < min_step)
|
|
min_step = step;
|
|
|
|
if (i == 0)
|
|
{
|
|
first_init = init;
|
|
first_step = step;
|
|
}
|
|
}
|
|
printf ("%s:\n"
|
|
" unw_{getcontext+init_local}: first=%9.3f min=%9.3f avg=%9.3f nsec\n"
|
|
" unw_step : first=%9.3f min=%9.3f avg=%9.3f nsec\n",
|
|
label,
|
|
1e9*first_init, 1e9*min_init, 1e9*sum_init/ITERATIONS,
|
|
1e9*first_step, 1e9*min_step, 1e9*sum_step/ITERATIONS);
|
|
}
|
|
|
|
int
|
|
main (int argc, char **argv)
|
|
{
|
|
if (argc > 1)
|
|
maxlevel = atol (argv[1]);
|
|
|
|
unw_set_caching_policy (unw_local_addr_space, UNW_CACHE_NONE);
|
|
doit ("Caching: none");
|
|
|
|
unw_set_caching_policy (unw_local_addr_space, UNW_CACHE_GLOBAL);
|
|
doit ("Caching: global");
|
|
|
|
unw_set_caching_policy (unw_local_addr_space, UNW_CACHE_PER_THREAD);
|
|
doit ("Caching: per-thread");
|
|
|
|
return 0;
|
|
}
|