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Add performance statistics to path finder

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New function path_find_print_stats() prints a few numbers of interest
when compiled with PATH_FIND_STATS defined.
This commit is contained in:
Markus Armbruster 2011-02-21 22:30:41 +01:00
parent d7dccef3b1
commit 18dd516076
3 changed files with 46 additions and 1 deletions
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41
src/lib/common/pathfind.c
View file

@ -52,6 +52,8 @@ static char *bufrotate(char *buf, size_t bufsz, size_t i);
/*
* Dijkstra's algorithm. Refer to your graph algorithm textbook for
* how it works. Implementation is specialized to hex maps.
*
* Define PATH_FIND_STATS for performance statistics on stdout.
*/
/*
@ -112,6 +114,22 @@ static int pf_suid;
static natid pf_actor;
static double (*pf_sct_cost)(natid, int);
/*
* Performance statistics
*/
#ifdef PATH_FIND_STATS
static unsigned pf_nsearch, pf_nsource, pf_nopen, pf_nclose;
static unsigned pf_nheap_max, pf_noway;
static double pf_sumcost;
#define STAT_INC(v) ((void)((v)++))
#define STAT_INCBY(v, i) ((void)((v) += i))
#define STAT_HIMARK(v, h) ((void)((v) < (h) ? (v) = (h) : (h)))
#else /* !PATH_FIND_STATS */
#define STAT_INC(v) ((void)0)
#define STAT_INCBY(v, i) ((void)0)
#define STAT_HIMARK(v, h) ((void)0)
#endif /* !PATH_FIND_STATS */
#ifndef NDEBUG /* silence "not used" warning */
/* Is sector with uid UID open? */
static int
@ -224,7 +242,9 @@ pf_open(int uid, coord x, coord y, int dir, double cost)
{
int i;
STAT_INC(pf_nopen);
i = pf_nheap++;
STAT_HIMARK(pf_nheap_max, (unsigned)pf_nheap);
DPRINTF("pf: open %d,%d %g %c %d\n", x, y, cost, dirch[dir], i);
assert(pf_is_unvisited(uid));
pf_map[uid].visit = pf_visit;
@ -248,6 +268,7 @@ pf_close(void)
{
int uid = pf_heap[0].uid;
STAT_INC(pf_nclose);
DPRINTF("pf: close %d,%d %d\n", pf_heap[0].x, pf_heap[0].y, pf_nheap);
assert(pf_is_open(uid));
if (--pf_nheap) {
@ -305,6 +326,7 @@ rev_dir(int dir)
static void
pf_set_source(coord sx, coord sy, natid actor, double (*cost)(natid, int))
{
STAT_INC(pf_nsource);
DPRINTF("pf: source %d,%d\n", sx, sy);
pf_sx = sx;
pf_sy = sy;
@ -339,10 +361,12 @@ path_find_to(coord dx, coord dy)
double cost, c1;
coord x, y, nx, ny;
STAT_INC(pf_nsearch);
DPRINTF("pf: dest %d,%d\n", dx, dy);
duid = XYOFFSET(dx, dy);
if (pf_is_closed(duid)) {
DPRINTF("pf: done old %g\n", pf_map[duid].cost);
STAT_INCBY(pf_sumcost, pf_map[duid].cost);
return pf_map[duid].cost;
}
@ -373,8 +397,11 @@ path_find_to(coord dx, coord dy)
}
DPRINTF("pf: done new %g\n", !pf_nheap ? -1.0 : pf_map[duid].cost);
if (!pf_nheap)
if (!pf_nheap) {
STAT_INC(pf_noway);
return -1.0;
}
STAT_INCBY(pf_sumcost, pf_map[duid].cost);
return pf_map[duid].cost;
}
@ -449,6 +476,18 @@ bufrotate(char *buf, size_t bufsz, size_t i)
return buf;
}
#ifdef PATH_FIND_STATS
void
path_find_print_stats(void)
{
printf("pathfind %u searches, %u sources, %u opened, %u closed,"
" %u heap max, %zu bytes, %u noway, %g avg cost\n",
pf_nsearch, pf_nsource, pf_nopen, pf_nclose,
pf_nheap_max,
(WORLD_SZ() * (sizeof(*pf_map) + sizeof(*pf_heap))),
pf_noway, pf_nsearch ? pf_sumcost / pf_nsearch : 0.0);
}
#endif
/*
* Empire interface glue