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authorRusty Russell <rusty@rustcorp.com.au>2011-12-05 16:42:49 +1030
committerRusty Russell <rusty@rustcorp.com.au>2011-12-05 16:42:49 +1030
commit18cd3dd2add0420d57118ccf58b28a48d9d68018 (patch)
tree8c487c348f9e8a213a501a86809c03547f53debc
parent5917d979911b024714d2d3a7b64255bffa37ec60 (diff)
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lib/ccan/htable: benchmark against hsearch(3)
Since that has a fixed hash table size and doesn't support delete, we can't do a thorough comparison, but we can insert and search. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (Imported from CCAN commit 95757f0e9d979e7c653e9b53bb640deb4f0ea1f9)
-rw-r--r--lib/ccan/htable/tools/Makefile6
-rw-r--r--lib/ccan/htable/tools/hsearchspeed.c103
-rw-r--r--lib/ccan/htable/tools/stringspeed.c1
3 files changed, 108 insertions, 2 deletions
diff --git a/lib/ccan/htable/tools/Makefile b/lib/ccan/htable/tools/Makefile
index 289d92b335..a21c51cb55 100644
--- a/lib/ccan/htable/tools/Makefile
+++ b/lib/ccan/htable/tools/Makefile
@@ -1,7 +1,7 @@
CFLAGS=-Wall -Werror -O3 -I../../..
#CFLAGS=-Wall -Werror -g -I../../..
-all: speed stringspeed
+all: speed stringspeed hsearchspeed
speed: speed.o hash.o
@@ -14,5 +14,7 @@ stringspeed: stringspeed.o hash.o ../../talloc.o ../../str_talloc.o ../../grab_f
stringspeed.o: speed.c ../htable.h ../htable.c
+hsearchspeed: hsearchspeed.o ../../talloc.o ../../str_talloc.o ../../grab_file.o ../../str.o ../../time.o ../../noerr.o
+
clean:
- rm -f stringspeed speed
+ rm -f stringspeed speed hsearchspeed *.o
diff --git a/lib/ccan/htable/tools/hsearchspeed.c b/lib/ccan/htable/tools/hsearchspeed.c
new file mode 100644
index 0000000000..ea1a3f5c4e
--- /dev/null
+++ b/lib/ccan/htable/tools/hsearchspeed.c
@@ -0,0 +1,103 @@
+/* Simple speed tests for a hash of strings using hsearch */
+#include <ccan/htable/htable_type.h>
+#include <ccan/htable/htable.c>
+#include <ccan/str_talloc/str_talloc.h>
+#include <ccan/grab_file/grab_file.h>
+#include <ccan/talloc/talloc.h>
+#include <ccan/hash/hash.h>
+#include <ccan/time/time.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <search.h>
+
+/* Nanoseconds per operation */
+static size_t normalize(const struct timeval *start,
+ const struct timeval *stop,
+ unsigned int num)
+{
+ struct timeval diff;
+
+ timersub(stop, start, &diff);
+
+ /* Floating point is more accurate here. */
+ return (double)(diff.tv_sec * 1000000 + diff.tv_usec)
+ / num * 1000;
+}
+
+int main(int argc, char *argv[])
+{
+ size_t i, j, num;
+ struct timeval start, stop;
+ char **w;
+ ENTRY *words, *misswords;
+
+ w = strsplit(NULL, grab_file(NULL,
+ argv[1] ? argv[1] : "/usr/share/dict/words",
+ NULL), "\n");
+ num = talloc_array_length(w) - 1;
+ printf("%zu words\n", num);
+
+ hcreate(num+num/3);
+
+ words = talloc_array(w, ENTRY, num);
+ for (i = 0; i < num; i++) {
+ words[i].key = w[i];
+ words[i].data = words[i].key;
+ }
+
+ /* Append and prepend last char for miss testing. */
+ misswords = talloc_array(w, ENTRY, num);
+ for (i = 0; i < num; i++) {
+ char lastc;
+ if (strlen(w[i]))
+ lastc = w[i][strlen(w[i])-1];
+ else
+ lastc = 'z';
+ misswords[i].key = talloc_asprintf(misswords, "%c%s%c%c",
+ lastc, w[i],
+ lastc, lastc);
+ }
+
+ printf("#01: Initial insert: ");
+ fflush(stdout);
+ start = time_now();
+ for (i = 0; i < num; i++)
+ hsearch(words[i], ENTER);
+ stop = time_now();
+ printf(" %zu ns\n", normalize(&start, &stop, num));
+
+ printf("#02: Initial lookup (match): ");
+ fflush(stdout);
+ start = time_now();
+ for (i = 0; i < num; i++)
+ if (hsearch(words[i], FIND)->data != words[i].data)
+ abort();
+ stop = time_now();
+ printf(" %zu ns\n", normalize(&start, &stop, num));
+
+ printf("#03: Initial lookup (miss): ");
+ fflush(stdout);
+ start = time_now();
+ for (i = 0; i < num; i++) {
+ if (hsearch(misswords[i], FIND))
+ abort();
+ }
+ stop = time_now();
+ printf(" %zu ns\n", normalize(&start, &stop, num));
+
+ /* Lookups in order are very cache-friendly for judy; try random */
+ printf("#04: Initial lookup (random): ");
+ fflush(stdout);
+ start = time_now();
+ for (i = 0, j = 0; i < num; i++, j = (j + 10007) % num)
+ if (hsearch(words[i], FIND)->data != words[i].data)
+ abort();
+ stop = time_now();
+ printf(" %zu ns\n", normalize(&start, &stop, num));
+
+ return 0;
+}
diff --git a/lib/ccan/htable/tools/stringspeed.c b/lib/ccan/htable/tools/stringspeed.c
index 2bc1524ea0..53ac4da650 100644
--- a/lib/ccan/htable/tools/stringspeed.c
+++ b/lib/ccan/htable/tools/stringspeed.c
@@ -59,6 +59,7 @@ int main(int argc, char *argv[])
NULL), "\n");
htable_str_init(&ht);
num = talloc_array_length(words) - 1;
+ /* Note that on my system, num is just > 98304, where we double! */
printf("%zu words\n", num);
/* Append and prepend last char for miss testing. */