The memcached-tool, located within the
scripts
directory within the
memcached source directory. The tool provides
covenient access to some reports and statistics from any
memcached instance.
The basic format of the command is:
shell> ./memcached-tool hostname:port [command]
The default output produces a list of the slab allocations and usage. For example:
shell> memcached-tool localhost:11211 display # Item_Size Max_age Pages Count Full? Evicted Evict_Time OOM 1 80B 93s 1 20 no 0 0 0 2 104B 93s 1 16 no 0 0 0 3 136B 1335s 1 28 no 0 0 0 4 176B 1335s 1 24 no 0 0 0 5 224B 1335s 1 32 no 0 0 0 6 280B 1335s 1 34 no 0 0 0 7 352B 1335s 1 36 no 0 0 0 8 440B 1335s 1 46 no 0 0 0 9 552B 1335s 1 58 no 0 0 0 10 696B 1335s 1 66 no 0 0 0 11 872B 1335s 1 89 no 0 0 0 12 1.1K 1335s 1 112 no 0 0 0 13 1.3K 1335s 1 145 no 0 0 0 14 1.7K 1335s 1 123 no 0 0 0 15 2.1K 1335s 1 198 no 0 0 0 16 2.6K 1335s 1 199 no 0 0 0 17 3.3K 1335s 1 229 no 0 0 0 18 4.1K 1335s 1 248 yes 36 2 0 19 5.2K 1335s 2 328 no 0 0 0 20 6.4K 1335s 2 316 yes 387 1 0 21 8.1K 1335s 3 381 yes 492 1 0 22 10.1K 1335s 3 303 yes 598 2 0 23 12.6K 1335s 5 405 yes 605 1 0 24 15.8K 1335s 6 384 yes 766 2 0 25 19.7K 1335s 7 357 yes 908 170 0 26 24.6K 1336s 7 287 yes 1012 1 0 27 30.8K 1336s 7 231 yes 1193 169 0 28 38.5K 1336s 4 104 yes 1323 169 0 29 48.1K 1336s 1 21 yes 1287 1 0 30 60.2K 1336s 1 17 yes 1093 169 0 31 75.2K 1337s 1 13 yes 713 168 0 32 94.0K 1337s 1 10 yes 278 168 0 33 117.5K 1336s 1 3 no 0 0 0
This output is the same if you specify the
command
as display
:
shell> memcached-tool localhost:11211 display # Item_Size Max_age Pages Count Full? Evicted Evict_Time OOM 1 80B 93s 1 20 no 0 0 0 2 104B 93s 1 16 no 0 0 0 ...
The output shows a summarized version of the output from the
slabs
statistics. The columns provided in the
output are shown below:
#
— the slab number
Item_Size
— the size of the slab
Max_age
— the age of the oldest
item in the slab
Pages
— number of pages allocated
to the slab
Count
— number of items in this
slab
Full?
— whether the slab is fully
populated
Evicted
— number of objects evicted
from this slab
Evict_Time
— the time (in seconds)
since the last eviction
OOM
— number of items that have
triggered an out of memory error
You can also obtain a dump of the general statistics for the
server using the stats
command:
shell> memcached-tool localhost:11211 stats #localhost:11211 Field Value accepting_conns 1 bytes 162 bytes_read 485 bytes_written 6820 cas_badval 0 cas_hits 0 cas_misses 0 cmd_flush 0 cmd_get 4 cmd_set 2 conn_yields 0 connection_structures 11 curr_connections 10 curr_items 2 decr_hits 0 decr_misses 1 delete_hits 0 delete_misses 0 evictions 0 get_hits 4 get_misses 0 incr_hits 0 incr_misses 2 limit_maxbytes 67108864 listen_disabled_num 0 pid 12981 pointer_size 32 rusage_system 0.013911 rusage_user 0.011876 threads 4 time 1255518565 total_connections 20 total_items 2 uptime 880 version 1.4.2
The memcached-tool will also provide
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