Changeset: a0578eb370a4 for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=a0578eb370a4
Modified Files:
gdk/gdk_hash.c
Branch: partioned-hash
Log Message:
Print hash statistics when ALGODEBUG is in effect.
diffs (53 lines):
diff --git a/gdk/gdk_hash.c b/gdk/gdk_hash.c
--- a/gdk/gdk_hash.c
+++ b/gdk/gdk_hash.c
@@ -410,6 +410,37 @@ BAThashsync(void *arg)
}
#endif
+static void
+HASHcollisions(BAT *b, Hash *h)
+{
+ BUN entries = 0;
+ BUN max = 0;
+ BUN cnt;
+ BUN total = 0;
+ BUN nil = h->nil;
+ int pcs;
+ BUN i;
+ BUN p;
+
+ for (pcs = 0; pcs < h->pieces; pcs++) {
+ for (i = 0; i <= h->mask; i++) {
+ if ((p = HASHget(h, pcs, i)) != nil) {
+ entries++;
+ for (cnt = 0; p != nil; p = HASHgetlink(h, p))
+ cnt++;
+ if (cnt > max)
+ max = cnt;
+ total += cnt;
+ }
+ }
+ }
+ fprintf(stderr, "#HASH stats %s#" BUNFMT ", pieces: %d, "
+ "chunksize: " BUNFMT ", mask: " BUNFMT ", entries: " BUNFMT ", "
+ "max chain: " BUNFMT ", average chain: %2.6f\n",
+ BATgetId(b), BATcount(b), h->pieces, h->chunk, h->mask,
+ entries, max, entries == 0 ? 0.0 : (double) total / entries);
+}
+
gdk_return
BAThash(BAT *b)
{
@@ -453,7 +484,10 @@ BAThash(BAT *b)
t0 = GDKusec();
for (i = 0; i < pieces; i++)
BATparthash(b, h, i);
- ALGODEBUG fprintf(stderr, "#BAThash: hash construction " LLFMT
" usec\n", GDKusec() - t0);
+ ALGODEBUG {
+ fprintf(stderr, "#BAThash(%s#" BUNFMT "[%s]): hash
construction " LLFMT " usec\n", BATgetId(b), BATcount(b), ATOMname(b->ttype),
GDKusec() - t0);
+ HASHcollisions(b, h);
+ }
#if 0
/* check that the hash table is correct */
{
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