annotate mod_log_events_by_memory/README.markdown @ 3656:3e0f4d727825

mod_vcard_muc: Add an alternative method of signaling avatar change When the avatar has been changed, a signal is sent that the room configuration has changed. Clients then do a disco#info query to find the SHA-1 of the new avatar. They can then fetch it as before, or not if they have it cached already. This is meant to be less disruptive than signaling via presence, which caused problems for some clients. If clients transition to the new method, the old one can eventually be removed. The namespace is made up while waiting for standardization. Otherwise it is very close to what's described in https://xmpp.org/extensions/inbox/muc-avatars.html
author Kim Alvefur <zash@zash.se>
date Sun, 25 Aug 2019 20:46:43 +0200
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1 This module compares the memory usage reported by Lua before and after
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2 each event and reports it to the log if it exceeds the configuration
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3 setting `log_memory_threshold` (in bytes).
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4
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5 ``` lua
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6 log_memory_threshold = 20*1024
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7 ```
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8
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9 If you are looking to identify memory leaks, please first read [Three
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10 kinds of memory
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11 leaks](https://blog.nelhage.com/post/three-kinds-of-leaks/).
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12
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13 Prosody runs on Lua which uses automatic memory management with garbage
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14 collection, so the numbers reported by this module are very likely to be
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15 useless for the purpose of identifying memory leaks. Large, but
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16 temporary, increases in memory usage can however highlight other kinds
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17 of performance problems and sometimes even provide hits for where to
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18 look for memory leaks.