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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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7 changed files with 18 additions and 11 deletions
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5
lib/multiif.h
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@ -42,8 +42,9 @@ bool Curl_is_in_callback(struct Curl_easy *easy);
CURLcode Curl_preconnect(struct Curl_easy *data);
/* Internal version of curl_multi_init() accepts size parameters for the
socket and connection hashes */
struct Curl_multi *Curl_multi_handle(int hashsize, int chashsize);
socket, connection and dns hashes */
struct Curl_multi *Curl_multi_handle(int hashsize, int chashsize,
int dnssize);
/* the write bits start at bit 16 for the *getsock() bitmap */
#define GETSOCK_WRITEBITSTART 16