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annotate mod_measure_memory/mod_measure_memory.lua @ 1918:c6db9d3dcff7

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mod_candy/README: Compact links
author Kim Alvefur <zash@zash.se>
date Thu, 22 Oct 2015 15:54:13 +0200
parents 4d38b8c03dfe
children a01a3fb96302
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2c39af0fb93b mod_measure_memory: Module for polling memory useage from Lua, meminfo() and /proc depending on availability
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1 module:set_global();
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2
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3 local measure = require"core.statsmanager".measure;
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4 local have_pposix, pposix = pcall(require, "util.pposix");
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5
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6 local measures = {};
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7 setmetatable(measures, {
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8 __index = function (t, k)
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9 local m = measure("sizes", "memory."..k); t[k] = m; return m;
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10 end
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11 });
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12
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13 module:hook("stats-update", function ()
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14 measures.lua(collectgarbage("count")*1024);
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15 end);
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16
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17 if have_pposix and pposix.meminfo then
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18 module:hook_global("stats-update", function ()
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19 local m = measures;
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20 for k, v in pairs(pposix.meminfo()) do
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21 m[k](v);
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22 end
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23 end);
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24 end
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25
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26 if require"lfs".attributes("/proc/self/statm", "mode") == "file" then
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27 local pagesize = module:get_option_number("memory_pagesize", 4096); -- getconf PAGESIZE
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28
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29 module:hook("stats-update", function ()
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30 local statm, err = io.open("/proc/self/statm");
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31 if not statm then
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32 module:log("error", tostring(err));
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33 return;
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34 end
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35 -- virtual memory (caches, opened librarys, everything)
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36 measures.total(statm:read("*n") * pagesize);
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37 -- resident set size (actually used memory)
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38 measures.rss(statm:read("*n") * pagesize);
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39 statm:close();
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40 end);
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41 end