Spec-Zone .ru
спецификации, руководства, описания, API
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Spec-Zone .ru
спецификации, руководства, описания, API
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To get the items statistics, use the stats items
command, or the API equivalent.
The items statistics give information about the individual items allocated within a
given slab class.
STAT items:2:number 1STAT items:2:age 452STAT items:2:evicted 0STAT items:2:evicted_nonzero 0STAT items:2:evicted_time 2STAT items:2:outofmemory 0STAT items:2:tailrepairs 0...STAT items:27:number 1STAT items:27:age 452STAT items:27:evicted 0STAT items:27:evicted_nonzero 0STAT items:27:evicted_time 2STAT items:27:outofmemory 0STAT items:27:tailrepairs 0
The prefix number against each statistics relates to the corresponding chunk size, as returned by the stats slabs statistics. The result is a display of the number of items stored within
each chunk within each slab size, and specific statistics about their age, eviction counts, and out of memory
counts. A summary of the statistics is given in the following table.
| Statistic | Description | |
|---|---|---|
number |
The number of items currently stored in this slab class. | |
age |
The age of the oldest item within the slab class, in seconds. | |
evicted |
The number of items evicted to make way for new entries. | |
evicted_time |
The time of the last evicted entry | |
evicted_nonzero |
The time of the last evicted non-zero entry | 1.4.0 |
outofmemory |
The number of items for this slab class that have triggered an out of memory error (only value when
the -Mcommand line option is in effect).
|
|
tailrepairs |
Number of times the entries for a particular ID need repairing |
Item level statistics can be used to determine how many items are stored within a given slab and their freshness and recycle rate. You can use this to help identify whether there are certain slab classes that are triggering a much larger number of evictions that others.