memcache1.5.8——stats settings 解释

Myth丶恋晨 2022-05-21 09:45 160阅读 0赞

本文主要参考：

[https://github.com/memcached/memcached/blob/master/doc/protocol.txt][https_github.com_memcached_memcached_blob_master_doc_protocol.txt]

stats settings 命令解释

The "stats" command with the argument of "settings" returns details of

the settings of the running memcached. This is primarily made up of

the results of processing commandline options.

Note that these are not guaranteed to return in any specific order and

this list may not be exhaustive. Otherwise, this returns like any

other stats command.

|-------------------+----------+----------------------------------------------|

| Name | Type | Meaning |

|-------------------+----------+----------------------------------------------|

| maxbytes | size\_t | Maximum number of bytes allowed in the cache |

| maxconns | 32 | Maximum number of clients allowed. |

| tcpport | 32 | TCP listen port. |

| udpport | 32 | UDP listen port. |

| inter | string | Listen interface. |

| verbosity | 32 | 0 = none, 1 = some, 2 = lots |

| oldest | 32u | Age of the oldest honored object. |

| evictions | on/off | When off, LRU evictions are disabled. |

| domain\_socket | string | Path to the domain socket (if any). |

| umask | 32 (oct) | umask for the creation of the domain socket. |

| growth\_factor | float | Chunk size growth factor. |

| chunk\_size | 32 | Minimum space allocated for key+value+flags. |

| num\_threads | 32 | Number of threads (including dispatch). |

| stat\_key\_prefix | char | Stats prefix separator character. |

| detail\_enabled | bool | If yes, stats detail is enabled. |

| reqs\_per\_event | 32 | Max num IO ops processed within an event. |

| cas\_enabled | bool | When no, CAS is not enabled for this server. |

| tcp\_backlog | 32 | TCP listen backlog. |

| auth\_enabled\_sasl | yes/no | SASL auth requested and enabled. |

| item\_size\_max | size\_t | maximum item size |

| maxconns\_fast | bool | If fast disconnects are enabled |

| hashpower\_init | 32 | Starting size multiplier for hash table |

| slab\_reassign | bool | Whether slab page reassignment is allowed |

| slab\_automove | bool | Whether slab page automover is enabled |

| slab\_automove\_ratio |

| | float | Ratio limit between young/old slab classes |

| slab\_automove\_window |

| | 32u | Internal algo tunable for automove |

| slab\_chunk\_max | 32 | Max slab class size (avoid unless necessary) |

| hash\_algorithm | char | Hash table algorithm in use |

| lru\_crawler | bool | Whether the LRU crawler is enabled |

| lru\_crawler\_sleep | 32 | Microseconds to sleep between LRU crawls |

| lru\_crawler\_tocrawl |

| | 32u | Max items to crawl per slab per run |

| lru\_maintainer\_thread |

| | bool | Split LRU mode and background threads |

| hot\_lru\_pct | 32 | Pct of slab memory reserved for HOT LRU |

| warm\_lru\_pct | 32 | Pct of slab memory reserved for WARM LRU |

| hot\_max\_factor | float | Set idle age of HOT LRU to COLD age \* this |

| warm\_max\_factor | float | Set idle age of WARM LRU to COLD age \* this |

| temp\_lru | bool | If yes, items < temporary\_ttl use TEMP\_LRU |

| temporary\_ttl | 32u | Items with TTL < this are marked temporary |

| idle\_time | 0 | Drop connections that are idle this many |

| | | seconds (0 disables) |

| watcher\_logbuf\_size |

| | 32u | Size of internal (not socket) write buffer |

| | | per active watcher connected. |

| worker\_logbuf\_size| 32u | Size of internal per-worker-thread buffer |

| | | which the background thread reads from. |

| track\_sizes | bool | If yes, a "stats sizes" histogram is being |

| | | dynamically tracked. |

| inline\_ascii\_response |

| | bool | If yes, stores numbers from VALUE response |

| | | inside an item, using up to 24 bytes. |

| | | Small slowdown for ASCII get, faster sets. |

|-------------------+----------+----------------------------------------------|

具体的执行情况例如：

stats settings
    STAT maxbytes 9437184
    STAT maxconns 1024
    STAT tcpport 11211
    STAT udpport 0
    STAT inter NULL
    STAT verbosity 0
    STAT oldest 0
    STAT evictions on
    STAT domain_socket NULL
    STAT umask 700
    STAT growth_factor 1.25
    STAT chunk_size 48
    STAT num_threads 4
    STAT num_threads_per_udp 4
    STAT stat_key_prefix :
    STAT detail_enabled no
    STAT reqs_per_event 20
    STAT cas_enabled yes
    STAT tcp_backlog 1024
    STAT binding_protocol auto-negotiate
    STAT auth_enabled_sasl no
    STAT item_size_max 1048576
    STAT maxconns_fast yes
    STAT hashpower_init 0
    STAT slab_reassign yes
    STAT slab_automove 1
    STAT slab_automove_ratio 0.80
    STAT slab_automove_window 30
    STAT slab_chunk_max 524288
    STAT lru_crawler yes
    STAT lru_crawler_sleep 100
    STAT lru_crawler_tocrawl 0
    STAT tail_repair_time 0
    STAT flush_enabled yes
    STAT dump_enabled yes
    STAT hash_algorithm murmur3
    STAT lru_maintainer_thread yes
    STAT lru_segmented yes
    STAT hot_lru_pct 20
    STAT warm_lru_pct 40
    STAT hot_max_factor 0.20
    STAT warm_max_factor 2.00
    STAT temp_lru no
    STAT temporary_ttl 61
    STAT idle_timeout 0
    STAT watcher_logbuf_size 262144
    STAT worker_logbuf_size 65536
    STAT track_sizes no
    STAT inline_ascii_response no
    END

[https_github.com_memcached_memcached_blob_master_doc_protocol.txt]: https://github.com/memcached/memcached/blob/master/doc/protocol.txt