dormando

-- local zone could/should be fetched from environment or local file.
-- doing so allows all configuration files to be identical, simplifying consistency checks.
local my_zone = 'z1'

function mcp_config_selectors(oldss)

    -- alias mcp.server for convenience.
    -- important to alias global variables in routes where speed is concerned.
    local srv = mcp.server
    -- local zones = { 'z1', 'z2', 'z3' }

dormando

$ perldoc
Usage: perldoc [-hVriDtumUFXlT] [-n nroffer_program]
    [-d output_filename] [-o output_format] [-M FormatterModule]
    [-w formatter_option:option_value] [-L translation_code]
    PageName|ModuleName|ProgramName

Examples:

    perldoc -f PerlFunc
    perldoc -q FAQKeywords

dormando

gcc  -g -O2 -pthread -pthread -Wall -Werror -pedantic -Wmissing-prototypes -Wmissing-declarations -Wredundant-decls  -lseccomp -o memcached memcached-memcached.o memcached-hash.o memcached-jenkins_hash.o memcached-murmur3_hash.o memcached-slabs.o memcached-items.o memcached-assoc.o memcached-thread.o memcached-daemon.o memcached-stats.o memcached-util.o memcached-bipbuffer.o memcached-logger.o memcached-crawler.o memcached-itoa_ljust.o memcached-cache.o  memcached-linux_priv.o   -levent 
memcached-linux_priv.o: In function `drop_privileges':
/git/memcached/linux_priv.c:12: undefined reference to `seccomp_init'
/git/memcached/linux_priv.c:18: undefined reference to `seccomp_rule_add'
/git/memcached/linux_priv.c:19: undefined reference to `seccomp_rule_add'
/git/memcached/linux_priv.c:20: undefined reference to `seccomp_rule_add'
/git/memcached/linux_priv.c:21: undefined reference to `seccomp_rule_add'
/git/memcached/linux_priv.c:22: undefined reference to `seccomp_rule_add'
memcached-linux_priv.o:/git/memcache

dormando

./memcached -t 32 -m 2000 -o hash_algorithm=murmur3

2 byte value sizes (10-20 bytes per key in response)

cmd_get   avg/s ( 4/s sample): 20877372.2484227
cmd_set   avg/s ( 4/s sample): 0
get_hits  avg/s ( 4/s sample): 20877372.2484227
cmd_get   avg/s ( 4/s sample): 20164041.5051711
cmd_set   avg/s ( 4/s sample): 0
get_hits  avg/s ( 4/s sample): 20164041.5051711

dormando

./memcached -t 16 -m 2000 -o hash_algorithm=murmur3

single keys per request. small size.
cmd_get   avg/s ( 4/s sample): 1839021.74880433
cmd_set   avg/s ( 4/s sample): 0
get_hits  avg/s ( 4/s sample): 1839021.74880433
cmd_get   avg/s ( 4/s sample): 1779819.53294892
cmd_set   avg/s ( 4/s sample): 0
get_hits  avg/s ( 4/s sample): 1779819.53294892
cmd_get   avg/s ( 4/s sample): 1768751.01097961

dormando

./memcached -t 16 -m 2000 -o hash_algorithm=murmur3
200,000 items loaded.

mget=50 test. ascii protocol.
cmd_get   avg/s ( 4/s sample): 14471090.2723673
cmd_set   avg/s ( 4/s sample): 0
get_hits  avg/s ( 4/s sample): 14471090.2723673
cmd_get   avg/s ( 4/s sample): 14842022.182218
cmd_set   avg/s ( 4/s sample): 0
get_hits  avg/s ( 4/s sample): 14842022.182218

dormando

Pseudo-random eviction

https://github.com/dormando/memcached/tree/slab_boost (the branch is here since it's not been merged into mainline yet)

I've made some small modifications to the slab rebalancing system to make it more aggressive. You can now reassign memory between classes all you want, compared to having to wait for a class to use up all the new items you just moved to it. The rebalancer and automover are now actually separate threads, instead of separate processes in the same thread. The rebalancer waits for a kickoff from a "slabs_reassign" command and immediately chews through memory. This command may be kicked off manually, via the slow automover (now known as automove=1), and via a new pants-on-fire "move slab page on first eviction" mode (automove=2).

memcached v1.4.13-slab_boost with slab_reassign,slab_automove=2

+---------------------------------------------------------+

dormando

mc-crusher. cache daemons both running with -t 4 (default, four threads each)

conf/asciiconf (N conns, single key fetch per command)

twemcache: 430k/s peak
1.4.13: 478k/s peak

conf/mget_test (N conns, 50 keys fetched per command)

twemcache: 1.36m/s peak

dormando

set foo -> hi
 -> (stored)

get foo
 -> hi

delete foo 10
 -> (deleted)

get foo

dormando

                    Memcached 1.4.1-rc1 Release Notes
                    =============================

Date: 2009-08-26 Wed


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