The 'age' is the oldest item. 'number' isn't automatically adjusted as
items are expired, they are adjusted as they are evicted.
I'd recommend upgrading to 1.2.5, where 'stats items' gives
per-slab-class eviction stats. You can monitor those numbers to see
which item size is causing the most evictions (if any), and pull some
estimates based on the rate of evictions.
It's hard / not currently possible to get the average/exact statistics
there. They're not really all too necessary; if you're causing evictions
either you're storing too many items with no expire time, or you're
prematurely expiring items and need more memory, or a restart of memcached.
-Dormando
Alexander Zaitsev wrote:
Hi all,
Could you advise how to read and understand 'stats items'? In
particular, I would like to know how long items live in cache (average)
before they are pushed out.
For example:
stats items
STAT items:4:number 72083
STAT items:4:age 58041
STAT items:5:number 89114
STAT items:5:age 52292
STAT items:6:number 16644
STAT items:6:age 52224
STAT items:7:number 89586
STAT items:7:age 55826
STAT items:8:number 5294
STAT items:8:age 49658
STAT items:9:number 16912
STAT items:9:age 53308
STAT items:10:number 8455
STAT items:10:age 52034
STAT items:11:number 9457
STAT items:11:age 52201
STAT items:12:number 9702
STAT items:12:age 52394
STAT items:13:number 11206
STAT items:13:age 50819
STAT items:14:number 6201
STAT items:14:age 41512
STAT items:15:number 3305
STAT items:15:age 43864
STAT items:16:number 1323
STAT items:16:age 43923
STAT items:17:number 704
STAT items:17:age 57077
STAT items:18:number 281
STAT items:18:age 51194
STAT items:19:number 223
STAT items:19:age 133899
STAT items:20:number 179
STAT items:20:age 360707
STAT items:21:number 64
STAT items:21:age 505915
STAT items:22:number 23
STAT items:22:age 519107
STAT items:23:number 2
STAT items:23:age 5426
STAT items:24:number 1
STAT items:24:age 283914
STAT items:25:number 1
STAT items:25:age 818
END
Thanks in advance!
