prosody-modules
adc6241e5d16
mod_statistics_mem/mod_statistics_mem.lua

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mod_statistics_mem/mod_statistics_mem.lua @ 4877:adc6241e5d16

mod_measure_process: Report the enforced limit The soft limit is what the kernel actually enforces, while the hard limit is is how far you can change the soft limit without privileges. Unless the process dynamically adjusts the soft limit, knowing the hard limit is not as useful as knowing the soft limit. Reporting the soft limit and the number of in-use FDs allows placing alerts on expressions like 'process_open_fds / process_max_fds >= 0.95'
author Kim Alvefur <zash@zash.se>
date Tue, 18 Jan 2022 18:55:20 +0100
parent 1379:403d5cd924eb
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403d5cd924eb mod_statistics_mem: Module that collects memory usage stats from /proc
Kim Alvefur <zash@zash.se>
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1 -- Probably Linux-specific memory statistics
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2
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3 module:set_global();
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4
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5 local human;
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6 do
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7 local tostring = tostring;
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8 local s_format = string.format;
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9 local m_floor = math.floor;
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10 local m_max = math.max;
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11 local prefixes = "kMGTPEZY";
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12 local multiplier = 1024;
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13
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14 function human(num)
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15 num = tonumber(num) or 0;
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16 local m = 0;
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17 while num >= multiplier and m < #prefixes do
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18 num = num / multiplier;
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19 m = m + 1;
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20 end
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21
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22 return s_format("%0."..m_max(0,3-#tostring(m_floor(num))).."f%sB",
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23 num, m > 0 and (prefixes:sub(m,m) .. "i") or "");
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24 end
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25 end
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27
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28 local pagesize = 4096; -- according to getpagesize()
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29 module:provides("statistics", {
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30 statistics = {
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31 memory_total = { -- virtual memory
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32 get = function ()
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33 local statm, err = io.open"/proc/self/statm";
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34 if statm then
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35 local total = statm:read"*n";
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36 statm:close();
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37 return total * pagesize;
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38 else
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39 module:log("debug", err);
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40 end
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41 end;
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42 tostring = human;
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43 };
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44 memory_rss = { -- actual in-memory data size
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45 get = function ()
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46 local statm, err = io.open"/proc/self/statm";
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47 if statm then
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48 statm:read"*n"; -- Total size, ignore
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49 local rss = statm:read"*n";
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50 statm:close();
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51 return rss * pagesize;
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52 else
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53 module:log("debug", err);
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54 end
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55 end;
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56 tostring = human;
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57 };
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58 }
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59 });