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@yongboy
Created September 30, 2017 02:46
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使用方式: 1. 可以单独用作init_worker_by_lua_file指令配置 2. 或单独在对应需要初始化的代码所需要地方,导入即可:require "lua_malloc_trim"
-- 目的:启动一个单独定时器,每隔一段时间自动调用glibc库对应的libc.so.6文件的malloc_trim()接口,尝试清理掉被缓存已free掉的内存信息
-- 使用方式:
-- 1. 可以单独用作init_worker_by_lua_file指令配置
-- 2. 或单独在对应需要初始化的代码所需要地方,导入即可:require "lua_malloc_trim"
-- User: nieyong
-- Date: 2017/9/20
-- Time: 下午8:45
local ffi = require "ffi"
local glibc = ffi.load("c")
if ffi.os == "Windows" then
ngx.log(ngx.ALERT, "DOES NOT SUPPORT windows")
return
elseif ffi.os == "OSX" then
ngx.log(ngx.ALERT, "DOES NOT SUPPORT MAC OS X")
return
end
ffi.cdef[[
int malloc_trim(size_t pad);
]]
local delay = 15 * 60 -- in seconds
local new_timer = ngx.timer.at
local log = ngx.log
local ERR = ngx.ERR
local NOTICE = ngx.NOTICE
local check
check = function(premature)
if not premature then
local rnum = glibc.malloc_trim(1)
log(NOTICE, "got malloc_trim return ", rnum)
local ok, err = new_timer(delay, check)
if not ok then
log(ERR, "failed to create timer: ", err)
return
end
end
end
local ok, err = new_timer(delay, check)
if not ok then
log(ERR, "failed to create timer: ", err)
return
end
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