Changeset 9e83b15 for protocols/nogaim.c

Timestamp:

2018-07-03T05:58:47Z (6 years ago)

Author:

dequis <dx@…>

Branches:

master

Children:

c17d0af

Parents:

49ab3cb

git-author:

dequis <dx@…> (03-07-18 05:27:59)

git-committer:

dequis <dx@…> (03-07-18 05:58:47)

Message:

Add a hash table to speed up bee_user_by_handle()

This maintains a hash table next to the linked list, which results in
negligible additional memory usage (~300kb for 10k users) but allows
instant lookups.

This was a big problem with discord, which has huge user lists and joins
everyone to every channel. In my test, the GUILD_SYNC event for 10k-50k
user lists is now approximately 5 times faster.

This hash table based code is only used if handle_cmp is either
exact or case-insensitive string comparison (g_ascii_strcasecmp or
strcmp/g_strcmp0).

The old function that goes through the bee->users linked list is now
called bee_user_by_handle_slow() and used for protocols with unusual
handle_cmp functions - skimming through the code, just oscar.
May revisit this if it happens to more meaningful protocols.

The case-insensitive hashtable functions are copied from irssi, which is
also GPLv2. I renamed them from g_ to b_ (g_istr_equal to b_istr_equal)

File:

• protocols/nogaim.c (modified) (3 diffs)

protocols/nogaim.c

@@ -298 +298 @@
 {
         struct im_connection *ic;
+        GHashFunc fn_hash = NULL;
+        GEqualFunc fn_equal = NULL;
 
         ic = g_new0(struct im_connection, 1);
@@ -304 +306 @@
         ic->acc = acc;
         acc->ic = ic;
+
+        /* figure out if we have hashing functions compatible with handle_cmp */
+        if (acc->prpl->handle_cmp == g_ascii_strcasecmp) {
+                fn_hash = b_istr_hash;
+                fn_equal = b_istr_equal;
+        } else if (acc->prpl->handle_cmp == g_strcmp0 || acc->prpl->handle_cmp == strcmp) {
+                fn_hash = g_str_hash;
+                fn_equal = g_str_equal;
+        }
+
+        /* only create the hash table if we found them */
+        if (fn_hash && fn_equal) {
+                ic->bee_users = g_hash_table_new_full(fn_hash, fn_equal, NULL, NULL);
+        }
 
         connections = g_slist_append(connections, ic);
@@ -320 +336 @@
                         break;
                 }
+        }
+
+        if (ic->bee_users) {
+                g_hash_table_destroy(ic->bee_users);
         }