Created
June 23, 2013 13:48
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Calling libunwind on Linux
This is modified from https://gist.github.com/blakejohnson/5831456
Only "make test3" was tested (the rest may require extra things to be installed)
You need an installation of Julia. The Makefile assumes this is in /home/yourusername/src/.
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all: test test2 test3 | |
JULIADIR = $(HOME)/src/julia | |
JULIALIB = $(JULIADIR)/usr/lib | |
OPENBLASDIR = $(JULIADIR)/deps/openblas-develop | |
UNWINDDIR = $(JULIADIR)/deps/libunwind-1.1 | |
# LDFLAGS = -Wl,-no_compact_unwind | |
LDFLAGS = | |
CC = gcc | |
test: unwind.c | |
$(CC) -g -DAPPLEBLAS -framework vecLib -lblas $(LDFLAGS) unwind.c -o test | |
LDFLAGS += -Wl,-rpath,$(JULIALIB) | |
test2: unwind.c | |
$(CC) -g -I$(OPENBLASDIR) -L$(JULIALIB) -lopenblas $(LDFLAGS) unwind.c -o test2 | |
test3: unwind.c | |
$(CC) -g -DFORTRANBLAS -I$(OPENBLASDIR) -I$(UNWINDDIR)/include -L$(JULIALIB) $(LDFLAGS) unwind.c -o test3 -lunwind -lopenblas |
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#include <stdlib.h> | |
#include <stdio.h> | |
#include <stddef.h> | |
#include <signal.h> | |
#include <sys/time.h> | |
#define UNW_LOCAL_ONLY | |
#include "libunwind.h" | |
typedef ptrdiff_t ptrint_t; | |
#ifdef APPLEBLAS | |
#include <Accelerate/Accelerate.h> | |
#else | |
#ifdef FORTRANBLAS | |
extern void daxpy_( | |
ptrdiff_t *n, | |
double *da, | |
double *dx, | |
ptrdiff_t *incx, | |
double *dy, | |
ptrdiff_t *incy | |
); | |
#else | |
#include "cblas.h" | |
#endif | |
#endif | |
struct itimerval timerprof; | |
static u_int64_t usecprof = 500; | |
int running; | |
int samples; | |
size_t rec_backtrace(size_t maxsize) | |
{ | |
unw_cursor_t cursor; unw_context_t uc; | |
unw_word_t ip, offset; | |
size_t n=0; | |
char fname[64]; | |
unw_getcontext(&uc); | |
unw_init_local(&cursor, &uc); | |
while (unw_step(&cursor) > 0 && n < maxsize) { | |
if (unw_get_reg(&cursor, UNW_REG_IP, &ip) < 0) { | |
break; | |
} | |
fname[0] = '\0'; | |
unw_get_proc_name(&cursor, fname, sizeof(fname), &offset); | |
printf("%p: (%s + 0x%x)\n", (void *)ip, fname, (unsigned int)offset); | |
} | |
printf("\n"); | |
return n; | |
} | |
static void sprofile_bt(int dummy) { | |
if (running) { | |
printf("Sample %d\n", samples); | |
rec_backtrace(10); | |
if (samples-- > 0) { | |
timerprof.it_value.tv_usec = usecprof; | |
setitimer(ITIMER_REAL, &timerprof, 0); | |
} | |
} | |
} | |
int start_timer(void) | |
{ | |
timerprof.it_interval.tv_sec = 0; | |
timerprof.it_interval.tv_usec = 0; | |
timerprof.it_value.tv_sec = 0; | |
timerprof.it_value.tv_usec = usecprof; | |
if (setitimer(ITIMER_REAL, &timerprof, 0) == -1) | |
return -3; | |
running = 1; | |
samples = 10; | |
signal(SIGALRM, sprofile_bt); | |
return 0; | |
} | |
void stop_timer(void) | |
{ | |
running = 0; | |
} | |
int blas_op(int a, double *x, double *y) { | |
#ifdef FORTRANBLAS | |
long n = 1000; | |
double da = (double)a; | |
long incx = 1, incy = 1; | |
daxpy_(&n, &da, x, &incx, y, &incy); | |
#else | |
cblas_daxpy(1000, (double)a, x, 1, y, 1); | |
#endif | |
return y[0]; | |
} | |
void fill_xy(double *x, double *y, int n) { | |
int ct; | |
for (ct=0; ct < n; ct++) { | |
x[ct] = (double)rand() / (double)RAND_MAX; | |
y[ct] = (double)rand() / (double)RAND_MAX; | |
} | |
} | |
int main(void) { | |
int a = 2; | |
int b; | |
double x[1000], y[1000]; | |
int ct; | |
fill_xy(x, y, 1000); | |
start_timer(); | |
for (ct = 0; ct < 10000; ct++) | |
b = blas_op(a, x, y); | |
stop_timer(); | |
return 0; | |
} |
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