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multi: use larger dns hash table for multi interface

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Have curl_multi_init() use a much larger DNS hash table than used for
the easy interface to scale and perform better when used with _many_
host names.

curl_share_init() sets an in-between size.

Inspired-by: Ivan Tsybulin
See #9340
Closes #9376
This commit is contained in:
Daniel Stenberg 2022-08-27 14:48:13 +02:00
parent c5c6e86783
commit 7632c0d25a
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GPG key ID: 5CC908FDB71E12C2
7 changed files with 18 additions and 11 deletions
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12
lib/multi.c
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@ -84,6 +84,10 @@
#define CURL_CONNECTION_HASH_SIZE 97
#endif
#ifndef CURL_DNS_HASH_SIZE
#define CURL_DNS_HASH_SIZE 71
#endif
#define CURL_MULTI_HANDLE 0x000bab1e
#define GOOD_MULTI_HANDLE(x) \
@ -388,7 +392,8 @@ static CURLMcode multi_addmsg(struct Curl_multi *multi,
}
struct Curl_multi *Curl_multi_handle(int hashsize, /* socket hash */
int chashsize) /* connection hash */
int chashsize, /* connection hash */
int dnssize) /* dns hash */
{
struct Curl_multi *multi = calloc(1, sizeof(struct Curl_multi));
@ -397,7 +402,7 @@ struct Curl_multi *Curl_multi_handle(int hashsize, /* socket hash */
multi->magic = CURL_MULTI_HANDLE;
Curl_init_dnscache(&multi->hostcache);
Curl_init_dnscache(&multi->hostcache, dnssize);
sh_init(&multi->sockhash, hashsize);
@ -451,7 +456,8 @@ struct Curl_multi *Curl_multi_handle(int hashsize, /* socket hash */
struct Curl_multi *curl_multi_init(void)
{
return Curl_multi_handle(CURL_SOCKET_HASH_TABLE_SIZE,
CURL_CONNECTION_HASH_SIZE);
CURL_CONNECTION_HASH_SIZE,
CURL_DNS_HASH_SIZE);
}
CURLMcode curl_multi_add_handle(struct Curl_multi *multi,