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Obtain LRU clock in a resolution dependent way.

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For testing purposes it is handy to have a very high resolution of the
LRU clock, so that it is possible to experiment with scripts running in
just a few seconds how the eviction algorithms works.

This commit allows Redis to use the cached LRU clock, or a value
computed on demand, depending on the resolution. So normally we have the
good performance of a precomputed value, and a clock that wraps in many
days using the normal resolution, but if needed, changing a define will
switch behavior to an high resolution LRU clock.
This commit is contained in:
antirez
2014-03-20 11:47:12 +01:00
parent 561e793472
commit 205c2ccc0c
4 changed files with 25 additions and 19 deletions
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9
src/redis.h
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@ -394,6 +394,12 @@ typedef struct redisObject {
void *ptr;
} robj;
/* Macro used to obtain the current LRU clock.
* If the current resolution is lower than the frequency we refresh the
* LRU clock (as it should be in production servers) we return the
* precomputed value, otherwise we need to resort to a function call. */
#define LRU_CLOCK() ((1000/server.hz <= REDIS_LRU_CLOCK_RESOLUTION) ? server.lruclock : getLRUClock())
/* Macro used to initialize a Redis object allocated on the stack.
* Note that this macro is taken near the structure definition to make sure
* we'll update it when the structure is changed, to avoid bugs like
@ -1055,7 +1061,7 @@ char *strEncoding(int encoding);
int compareStringObjects(robj *a, robj *b);
int collateStringObjects(robj *a, robj *b);
int equalStringObjects(robj *a, robj *b);
unsigned long estimateObjectIdleTime(robj *o);
unsigned long long estimateObjectIdleTime(robj *o);
#define sdsEncodedObject(objptr) (objptr->encoding == REDIS_ENCODING_RAW || objptr->encoding == REDIS_ENCODING_EMBSTR)
/* Synchronous I/O with timeout */
@ -1156,6 +1162,7 @@ void adjustOpenFilesLimit(void);
void closeListeningSockets(int unlink_unix_socket);
void updateCachedTime(void);
void resetServerStats(void);
unsigned int getLRUClock(void);
/* Set data type */
robj *setTypeCreate(robj *value);