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mod_log_events_by_memory/README.markdown @ 5850:f76909ec1300
mod_http_admin_api: metrics: Filter out a value that is commonly nan at startup
The upload bytes count is typically nan at startup, which cannot legally be
encoded in JSON.
I haven't assessed whether any other metrics might emit nan under other
circumstances, but this fixes the most visible issue right now.
| author | Matthew Wild <mwild1@gmail.com> |
|---|---|
| date | Sat, 13 Jan 2024 12:03:15 +0000 |
| parent | 3618:f781a90018f4 |
| rev | line source |
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3615
5fe34e5f9829
mod_log_events_by_memory: Log events where Lua memory usage increased
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
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1 This module compares the memory usage reported by Lua before and after |
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mod_log_events_by_memory: Log events where Lua memory usage increased
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
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2 each event and reports it to the log if it exceeds the configuration |
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5fe34e5f9829
mod_log_events_by_memory: Log events where Lua memory usage increased
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
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3 setting `log_memory_threshold` (in bytes). |
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5fe34e5f9829
mod_log_events_by_memory: Log events where Lua memory usage increased
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
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4 |
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5fe34e5f9829
mod_log_events_by_memory: Log events where Lua memory usage increased
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
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5 ``` lua |
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mod_log_events_by_memory: Log events where Lua memory usage increased
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parents:
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6 log_memory_threshold = 20*1024 |
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mod_log_events_by_memory: Log events where Lua memory usage increased
Kim Alvefur <zash@zash.se>
parents:
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7 ``` |
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mod_log_events_by_memory: Log events where Lua memory usage increased
Kim Alvefur <zash@zash.se>
parents:
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8 |
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3618
f781a90018f4
mod_log_events_by_memory: Add link to post explaining different kinds of memory leaks
Kim Alvefur <zash@zash.se>
parents:
3617
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9 If you are looking to identify memory leaks, please first read [Three |
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f781a90018f4
mod_log_events_by_memory: Add link to post explaining different kinds of memory leaks
Kim Alvefur <zash@zash.se>
parents:
3617
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10 kinds of memory |
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f781a90018f4
mod_log_events_by_memory: Add link to post explaining different kinds of memory leaks
Kim Alvefur <zash@zash.se>
parents:
3617
diff
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11 leaks](https://blog.nelhage.com/post/three-kinds-of-leaks/). |
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f781a90018f4
mod_log_events_by_memory: Add link to post explaining different kinds of memory leaks
Kim Alvefur <zash@zash.se>
parents:
3617
diff
changeset
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12 |
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3617
61b9c89db212
mod_log_events_by_memory: Add a rant to README about uselessness of this module
Kim Alvefur <zash@zash.se>
parents:
3615
diff
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13 Prosody runs on Lua which uses automatic memory management with garbage |
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61b9c89db212
mod_log_events_by_memory: Add a rant to README about uselessness of this module
Kim Alvefur <zash@zash.se>
parents:
3615
diff
changeset
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14 collection, so the numbers reported by this module are very likely to be |
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61b9c89db212
mod_log_events_by_memory: Add a rant to README about uselessness of this module
Kim Alvefur <zash@zash.se>
parents:
3615
diff
changeset
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15 useless for the purpose of identifying memory leaks. Large, but |
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61b9c89db212
mod_log_events_by_memory: Add a rant to README about uselessness of this module
Kim Alvefur <zash@zash.se>
parents:
3615
diff
changeset
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16 temporary, increases in memory usage can however highlight other kinds |
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61b9c89db212
mod_log_events_by_memory: Add a rant to README about uselessness of this module
Kim Alvefur <zash@zash.se>
parents:
3615
diff
changeset
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17 of performance problems and sometimes even provide hits for where to |
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61b9c89db212
mod_log_events_by_memory: Add a rant to README about uselessness of this module
Kim Alvefur <zash@zash.se>
parents:
3615
diff
changeset
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18 look for memory leaks. |
