From: Heng Li <lh3@me.com>
Date: Thu, 2 May 2013 19:51:14 +0000 (-0400)
Subject: test performance given packed struct
X-Git-Tag: spawn-final~28
X-Git-Url: http://www.kaiwu.me/postgresql/commit/?a=commitdiff_plain;h=7452f78d6ae657553e9667aaf885f211481fecc1;p=klib.git

test performance given packed struct
---

diff --git a/test/khash_test.c b/test/khash_test.c
index 8e54163..3a41670 100644
--- a/test/khash_test.c
+++ b/test/khash_test.c
@@ -8,6 +8,22 @@
 KHASH_SET_INIT_STR(str)
 KHASH_SET_INIT_INT(int)
 
+typedef struct {
+	unsigned key;
+	unsigned char val;
+} int_unpack_t;
+
+typedef struct {
+	unsigned key;
+	unsigned char val;
+} __attribute__ ((__packed__)) int_packed_t;
+
+#define hash_eq(a, b) ((a).key == (b).key)
+#define hash_func(a) ((a).key)
+
+KHASH_INIT(iun, int_unpack_t, char, 0, hash_func, hash_eq)
+KHASH_INIT(ipk, int_packed_t, char, 0, hash_func, hash_eq)
+
 static int data_size = 5000000;
 static unsigned *int_data;
 static char **str_data;
@@ -28,12 +44,14 @@ void ht_init_data()
 	}
 	printf("done!\n");
 }
+
 void ht_destroy_data()
 {
 	int i;
 	for (i = 0; i < data_size; ++i) free(str_data[i]);
 	free(str_data); free(int_data);
 }
+
 void ht_khash_int()
 {
 	int i, ret;
@@ -49,6 +67,7 @@ void ht_khash_int()
 	printf("[ht_khash_int] size: %u\n", kh_size(h));
 	kh_destroy(int, h);
 }
+
 void ht_khash_str()
 {
 	int i, ret;
@@ -64,18 +83,58 @@ void ht_khash_str()
 	printf("[ht_khash_int] size: %u\n", kh_size(h));
 	kh_destroy(str, h);
 }
+
+void ht_khash_unpack()
+{
+	int i, ret;
+	unsigned *data = int_data;
+	khash_t(iun) *h;
+	unsigned k;
+
+	h = kh_init(iun);
+	for (i = 0; i < data_size; ++i) {
+		int_unpack_t x;
+		x.key = data[i]; x.val = i&0xff;
+		k = kh_put(iun, h, x, &ret);
+		if (!ret) kh_del(iun, h, k);
+	}
+	printf("[ht_khash_unpack] size: %u (sizeof=%ld)\n", kh_size(h), sizeof(int_unpack_t));
+	kh_destroy(iun, h);
+}
+
+void ht_khash_packed()
+{
+	int i, ret;
+	unsigned *data = int_data;
+	khash_t(ipk) *h;
+	unsigned k;
+
+	h = kh_init(ipk);
+	for (i = 0; i < data_size; ++i) {
+		int_packed_t x;
+		x.key = data[i]; x.val = i&0xff;
+		k = kh_put(ipk, h, x, &ret);
+		if (!ret) kh_del(ipk, h, k);
+	}
+	printf("[ht_khash_packed] size: %u (sizeof=%ld)\n", kh_size(h), sizeof(int_packed_t));
+	kh_destroy(ipk, h);
+}
+
 void ht_timing(void (*f)(void))
 {
 	clock_t t = clock();
 	(*f)();
 	printf("[ht_timing] %.3lf sec\n", (double)(clock() - t) / CLOCKS_PER_SEC);
 }
+
 int main(int argc, char *argv[])
 {
 	if (argc > 1) data_size = atoi(argv[1]);
 	ht_init_data();
 	ht_timing(ht_khash_int);
 	ht_timing(ht_khash_str);
+	ht_timing(ht_khash_unpack);
+	ht_timing(ht_khash_packed);
 	ht_destroy_data();
 	return 0;
 }