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https://github.com/fluencelabs/redis
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Implemented a much better lazy expiring algorithm for EXPIRE
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parent
060f6be6bf
commit
f232429386
16
redis.c
16
redis.c
@ -940,14 +940,21 @@ static int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientD
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}
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}
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/* Try to expire a few timed out keys */
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/* Try to expire a few timed out keys. The algorithm used is adaptive and
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* will use few CPU cycles if there are few expiring keys, otherwise
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* it will get more aggressive to avoid that too much memory is used by
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* keys that can be removed from the keyspace. */
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for (j = 0; j < server.dbnum; j++) {
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int expired;
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redisDb *db = server.db+j;
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int num = dictSize(db->expires);
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if (num) {
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/* Continue to expire if at the end of the cycle more than 25%
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* of the keys were expired. */
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do {
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int num = dictSize(db->expires);
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time_t now = time(NULL);
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expired = 0;
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if (num > REDIS_EXPIRELOOKUPS_PER_CRON)
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num = REDIS_EXPIRELOOKUPS_PER_CRON;
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while (num--) {
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@ -958,9 +965,10 @@ static int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientD
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t = (time_t) dictGetEntryVal(de);
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if (now > t) {
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deleteKey(db,dictGetEntryKey(de));
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expired++;
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}
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}
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}
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} while (expired > REDIS_EXPIRELOOKUPS_PER_CRON/4);
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}
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/* Check if we should connect to a MASTER */
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