Memcache telnet 接口有命令称为STATS，它显示了很多数字，我在哪里可以看到它的含义？如何分析它们？多少缓存使用是有效的等等......
更新的文档位于https://github.com/memcached/memcached/blob/master/doc/protocol.txt https://github.com/memcached/memcached/blob/master/doc/protocol.txt.
|-----------------------+---------+-------------------------------------------|
| Name | Type | Meaning |
|-----------------------+---------+-------------------------------------------|
| pid | 32u | Process id of this server process |
| uptime | 32u | Number of secs since the server started |
| time | 32u | current UNIX time according to the server |
| version | string | Version string of this server |
| pointer_size | 32 | Default size of pointers on the host OS |
| | | (generally 32 or 64) |
| rusage_user | 32u.32u | Accumulated user time for this process |
| | | (seconds:microseconds) |
| rusage_system | 32u.32u | Accumulated system time for this process |
| | | (seconds:microseconds) |
| curr_items | 64u | Current number of items stored |
| total_items | 64u | Total number of items stored since |
| | | the server started |
| bytes | 64u | Current number of bytes used |
| | | to store items |
| max_connections | 32u | Max number of simultaneous connections |
| curr_connections | 32u | Number of open connections |
| total_connections | 32u | Total number of connections opened since |
| | | the server started running |
| rejected_connections | 64u | Conns rejected in maxconns_fast mode |
| connection_structures | 32u | Number of connection structures allocated |
| | | by the server |
| reserved_fds | 32u | Number of misc fds used internally |
| cmd_get | 64u | Cumulative number of retrieval reqs |
| cmd_set | 64u | Cumulative number of storage reqs |
| cmd_flush | 64u | Cumulative number of flush reqs |
| cmd_touch | 64u | Cumulative number of touch reqs |
| get_hits | 64u | Number of keys that have been requested |
| | | and found present |
| get_misses | 64u | Number of items that have been requested |
| | | and not found |
| get_expired | 64u | Number of items that have been requested |
| | | but had already expired. |
| get_flushed | 64u | Number of items that have been requested |
| | | but have been flushed via flush_all |
| delete_misses | 64u | Number of deletions reqs for missing keys |
| delete_hits | 64u | Number of deletion reqs resulting in |
| | | an item being removed. |
| incr_misses | 64u | Number of incr reqs against missing keys. |
| incr_hits | 64u | Number of successful incr reqs. |
| decr_misses | 64u | Number of decr reqs against missing keys. |
| decr_hits | 64u | Number of successful decr reqs. |
| cas_misses | 64u | Number of CAS reqs against missing keys. |
| cas_hits | 64u | Number of successful CAS reqs. |
| cas_badval | 64u | Number of CAS reqs for which a key was |
| | | found, but the CAS value did not match. |
| touch_hits | 64u | Number of keys that have been touched |
| | | with a new expiration time |
| touch_misses | 64u | Number of items that have been touched |
| | | and not found |
| auth_cmds | 64u | Number of authentication commands |
| | | handled, success or failure. |
| auth_errors | 64u | Number of failed authentications. |
| idle_kicks | 64u | Number of connections closed due to |
| | | reaching their idle timeout. |
| evictions | 64u | Number of valid items removed from cache |
| | | to free memory for new items |
| reclaimed | 64u | Number of times an entry was stored using |
| | | memory from an expired entry |
| bytes_read | 64u | Total number of bytes read by this server |
| | | from network |
| bytes_written | 64u | Total number of bytes sent by this server |
| | | to network |
| limit_maxbytes | size_t | Number of bytes this server is allowed to |
| | | use for storage. |
| accepting_conns | bool | Whether or not server is accepting conns |
| listen_disabled_num | 64u | Number of times server has stopped |
| | | accepting new connections (maxconns). |
| time_in_listen_disabled_us |
| | 64u | Number of microseconds in maxconns. |
| threads | 32u | Number of worker threads requested. |
| | | (see doc/threads.txt) |
| conn_yields | 64u | Number of times any connection yielded to |
| | | another due to hitting the -R limit. |
| hash_power_level | 32u | Current size multiplier for hash table |
| hash_bytes | 64u | Bytes currently used by hash tables |
| hash_is_expanding | bool | Indicates if the hash table is being |
| | | grown to a new size |
| expired_unfetched | 64u | Items pulled from LRU that were never |
| | | touched by get/incr/append/etc before |
| | | expiring |
| evicted_unfetched | 64u | Items evicted from LRU that were never |
| | | touched by get/incr/append/etc. |
| evicted_active | 64u | Items evicted from LRU that had been hit |
| | | recently but did not jump to top of LRU |
| slab_reassign_running | bool | If a slab page is being moved |
| slabs_moved | 64u | Total slab pages moved |
| crawler_reclaimed | 64u | Total items freed by LRU Crawler |
| crawler_items_checked | 64u | Total items examined by LRU Crawler |
| lrutail_reflocked | 64u | Times LRU tail was found with active ref. |
| | | Items can be evicted to avoid OOM errors. |
| moves_to_cold | 64u | Items moved from HOT/WARM to COLD LRU's |
| moves_to_warm | 64u | Items moved from COLD to WARM LRU |
| moves_within_lru | 64u | Items reshuffled within HOT or WARM LRU's |
| direct_reclaims | 64u | Times worker threads had to directly |
| | | reclaim or evict items. |
| lru_crawler_starts | 64u | Times an LRU crawler was started |
| lru_maintainer_juggles |
| | 64u | Number of times the LRU bg thread woke up |
| slab_global_page_pool | 32u | Slab pages returned to global pool for |
| | | reassignment to other slab classes. |
| slab_reassign_rescues | 64u | Items rescued from eviction in page move |
| slab_reassign_evictions_nomem |
| | 64u | Valid items evicted during a page move |
| | | (due to no free memory in slab) |
| slab_reassign_chunk_rescues |
| | 64u | Individual sections of an item rescued |
| | | during a page move. |
| slab_reassign_inline_reclaim |
| | 64u | Internal stat counter for when the page |
| | | mover clears memory from the chunk |
| | | freelist when it wasn't expecting to. |
| slab_reassign_busy_items |
| | 64u | Items busy during page move, requiring a |
| | | retry before page can be moved. |
| slab_reassign_busy_deletes |
| | 64u | Items busy during page move, requiring |
| | | deletion before page can be moved. |
| log_worker_dropped | 64u | Logs a worker never wrote due to full buf |
| log_worker_written | 64u | Logs written by a worker, to be picked up |
| log_watcher_skipped | 64u | Logs not sent to slow watchers. |
| log_watcher_sent | 64u | Logs written to watchers. |
|-----------------------+---------+-------------------------------------------|
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