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/*
* profile.c
*
* Simple profiling according to wall clock time
*
* Copyright © 2016-2022 Deutsches Elektronen-Synchrotron DESY,
* a research centre of the Helmholtz Association.
*
* Authors:
* 2016-2022 Thomas White <taw@physics.org>
*
* This file is part of CrystFEL.
*
* CrystFEL is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* CrystFEL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with CrystFEL. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <libcrystfel-config.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <assert.h>
#include <unistd.h>
#include "profile.h"
#ifndef CLOCK_MONOTONIC_RAW
#define CLOCK_MONOTONIC_RAW (CLOCK_MONOTONIC)
#endif
#define MAX_PROFILE_CHILDREN 256
struct _profile_block
{
char *name;
time_t start_sec;
long start_nsec;
double total_time;
struct _profile_block *parent;
struct _profile_block *children[MAX_PROFILE_CHILDREN];
int n_children;
};
struct _profiledata
{
struct _profile_block *root;
struct _profile_block *current;
};
struct _profiledata *pd = NULL;
static struct _profile_block *start_profile_block(const char *name)
{
struct _profile_block *b;
b = malloc(sizeof(struct _profile_block));
if ( b == NULL ) return NULL;
b->name = strdup(name);
if ( b->name == NULL ) {
free(b);
return NULL;
}
b->n_children = 0;
#ifdef HAVE_CLOCK_GETTIME
struct timespec tp;
clock_gettime(CLOCK_MONOTONIC_RAW, &tp);
b->start_sec = tp.tv_sec;
b->start_nsec = tp.tv_nsec;
#endif
return b;
}
static void stop_profile_block(struct _profile_block *b)
{
#ifdef HAVE_CLOCK_GETTIME
struct timespec tp;
clock_gettime(CLOCK_MONOTONIC_RAW, &tp);
time_t sec = tp.tv_sec - b->start_sec;
long nsec = tp.tv_nsec - b->start_nsec;
b->total_time = sec + nsec*1e-9;
#else
b->total_time = 0.0;
#endif
}
void profile_init()
{
if ( pd != NULL ) {
fprintf(stderr, "Attempted to initialise profiling twice!\n");
fflush(stderr);
abort();
}
if ( pd == NULL ) {
pd = malloc(sizeof(struct _profiledata));
if ( pd == NULL ) return;
}
pd->root = start_profile_block("root");
pd->current = pd->root;
pd->root->parent = NULL;
#ifndef HAVE_CLOCK_GETTIME
printf("Profiling disabled because clock_gettime is not available\n");
#endif
}
static char *format_profile_block(struct _profile_block *b)
{
int i;
size_t total_len = 0;
char *subbufs[MAX_PROFILE_CHILDREN];
char *full_buf;
total_len = 32 + strlen(b->name);
for ( i=0; i<b->n_children; i++ ) {
subbufs[i] = format_profile_block(b->children[i]);
total_len += 1 + strlen(subbufs[i]);
}
full_buf = malloc(total_len);
snprintf(full_buf, 32, "(%s %.3f", b->name, b->total_time);
for ( i=0; i<b->n_children; i++ ) {
strcat(full_buf, " ");
strcat(full_buf, subbufs[i]);
free(subbufs[i]);
}
strcat(full_buf, ")");
return full_buf;
}
static void free_profile_block(struct _profile_block *b)
{
int i;
for ( i=0; i<b->n_children; i++ ) {
free_profile_block(b->children[i]);
}
free(b->name);
free(b);
}
void profile_print_and_reset()
{
char *buf;
char *buf2;
if ( pd == NULL ) {
fprintf(stderr, "Profiling not initialised yet!\n");
fflush(stderr);
abort();
}
if ( pd->current != pd->root ) {
fprintf(stderr, "Attempted to finalise profiling while not "
"on root block (%s)\n", pd->current->name);
fflush(stderr);
abort();
}
stop_profile_block(pd->root);
buf = format_profile_block(pd->root);
buf2 = malloc(2+strlen(buf));
strcpy(buf2, buf);
strcat(buf2, "\n");
write(STDOUT_FILENO, buf2, strlen(buf2));
free_profile_block(pd->root);
pd->root = start_profile_block("root");
pd->current = pd->root;
pd->root->parent = NULL;
}
void profile_start(const char *name)
{
struct _profile_block *b;
if ( pd == NULL ) return;
if ( pd->current->n_children >= MAX_PROFILE_CHILDREN ) {
fprintf(stderr, "Too many profile children "
"(opening %s inside %s).\n",
pd->current->name, name);
fflush(stderr);
abort();
}
b = start_profile_block(name);
b->parent = pd->current;
pd->current->children[pd->current->n_children++] = b;
pd->current = b;
}
void profile_end(const char *name)
{
if ( pd == NULL ) return;
if ( pd->current == NULL ) {
fprintf(stderr, "No current profile block!\n");
fflush(stderr);
abort();
}
if ( strcmp(name, pd->current->name) != 0 ) {
fprintf(stderr, "Attempt to close wrong profile block (%s) "
"current block is %s\n", name, pd->current->name);
fflush(stderr);
abort();
}
stop_profile_block(pd->current);
pd->current = pd->current->parent;
}
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