启动
以下为 memcached 的参数
root@h101 memcached-1.4.24# /usr/local/bin/memcached -h
memcached 1.4.24
-p <num> TCP port number to listen on (default: 11211)
-U <num> UDP port number to listen on (default: 11211, 0 is off)
-s <file> UNIX socket path to listen on (disables network support)
-A enable ascii "shutdown" command
-a <mask> access mask for UNIX socket, in octal (default: 0700)
-l <addr> interface to listen on (default: INADDR_ANY, all addresses)
代码语言：txt复制 <addr> may be specified as host:port. If you don't specify a port number, the value you specified with -p or -U is used. You may specify multiple addresses separated by comma or by using -l multiple times-d run as a daemon
-r maximize core file limit
-u <username> assume identity of <username> (only when run as root)
-m <num> max memory to use for items in megabytes (default: 64 MB)
-M return error on memory exhausted (rather than removing items)
-c <num> max simultaneous connections (default: 1024)
-k lock down all paged memory. Note that there is a
代码语言：txt复制 limit on how much memory you may lock. Trying to allocate more than that would fail, so be sure you set the limit correctly for the user you started the daemon with (not for -u <username> user; under sh this is done with 'ulimit -S -l NUM_KB').-v verbose (print errors/warnings while in event loop)
-vv very verbose (also print client commands/reponses)
-vvv extremely verbose (also print internal state transitions)
-h print this help and exit
-i print memcached and libevent license
-V print version and exit
-P <file> save PID in <file>, only used with -d option
-f <factor> chunk size growth factor (default: 1.25)
-n <bytes> minimum space allocated for key value flags (default: 48)
-L Try to use large memory pages (if available). Increasing
代码语言：txt复制 the memory page size could reduce the number of TLB misses and improve the performance. In order to get large pages from the OS, memcached will allocate the total item-cache in one large chunk.-D <char> Use <char> as the delimiter between key prefixes and IDs.
代码语言：txt复制 This is used for per-prefix stats reporting. The default is ":" (colon). If this option is specified, stats collection is turned on automatically; if not, then it may be turned on by sending the "stats detail on" command to the server.-t <num> number of threads to use (default: 4)
-R Maximum number of requests per event, limits the number of
代码语言：txt复制 requests process for a given connection to prevent starvation (default: 20)-C Disable use of CAS
-b Set the backlog queue limit (default: 1024)
-B Binding protocol - one of ascii, binary, or auto (default)
-I Override the size of each slab page. Adjusts max item size
代码语言：txt复制 (default: 1mb, min: 1k, max: 128m)-F Disable flush_all command
-o Comma separated list of extended or experimental options
代码语言：txt复制 - (EXPERIMENTAL) maxconns_fast: immediately close new
connections if over maxconns limit
- hashpower: An integer multiplier for how large the hash
table should be. Can be grown at runtime if not big enough.
Set this based on "STAT hash_power_level" before a
restart.
- tail_repair_time: Time in seconds that indicates how long to wait before
forcefully taking over the LRU tail item whose refcount has leaked.
Disabled by default; dangerous option.
- hash_algorithm: The hash table algorithm
default is jenkins hash. options: jenkins, murmur3
- lru_crawler: Enable LRU Crawler background thread
- lru_crawler_sleep: Microseconds to sleep between items
default is 100.
- lru_crawler_tocrawl: Max items to crawl per slab per run
default is 0 (unlimited)
- lru_maintainer: Enable new LRU system background thread
- hot_lru_pct: Pct of slab memory to reserve for hot lru.
(requires lru_maintainer)
- warm_lru_pct: Pct of slab memory to reserve for warm lru.
(requires lru_maintainer)
- expirezero_does_not_evict: Items set to not expire, will not evict.
(requires lru_maintainer)root@h101 memcached-1.4.24# 
