mirror of
https://github.com/matrix-construct/construct
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98 lines
6.6 KiB
Markdown
98 lines
6.6 KiB
Markdown
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## TUNING
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This guide is intended for system administrators to optimize Construct and
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maximize its performance for their environment. This does not cover [BUILD](BUILD.md)
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tuning, and it is expected that Construct is already installed and the [SETUP](SETUP.md)
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has been completed.
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- Some instructions may reference Construct's configuration system. This is
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accessed via the administrator's console which can be reached by striking
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`ctrl-c (SIGINT)` and then using the `conf` command (see: `help conf`). The
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console can also be reached interactively through your preferred client in
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the `!control` room. Alternatively, configuration state can be manipulated
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directly through the `!conf` room. Configuration changes take effect as a
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result of state events sent to the `!conf` room, thus all aforementioned
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methods to change configuration are the same.
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- CHANGES TO CONFIGURATION ARE EFFECTIVE IMMEDIATELY. ERRONEOUS VALUES MAY
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CAUSE UNEXPECTED BEHAVIOR AND RESULT IN PROGRAM TERMINATION. CONFIGURATION
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ERRORS MAY ALSO PREVENT STARTUP. Please see the
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[TROUBLESHOOTING](TROUBLESHOOTING.md#recovering-from-broken-configurations)
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guide for how to recover from configuration errors.
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### Event Cache Tuning
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Most of Construct's runtime footprint in RAM consists of a cache of Matrix
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events read from the database. The data in many of these events may be
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directly accessed for fundamental server operations; for example, a client's
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access-token and user information is stored with events in special server
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rooms. The event cache is a set of LRU (Least Recently Used) caches. The size
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of these caches should be tuned to at least the "working-set size" expected
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by the server. If these caches are too small, load will be placed
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on the next storage tier. For storage devices with poor random access
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characteristics it is important these caches cover the server's working-set
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size.
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To list the event cache information, try the following commands (example output
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shown):
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```
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> db cache events *
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COLUMN PCT HITS MISSES INSERT CACHED CAPACITY INSERT TOTAL LOCKED
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* 61.94% 18742243 3818637 3814446 1.41 GiB (1517280856) 2.28 GiB (2449473536) 4.46 GiB (4787594200) 4.41 MiB (4628512)
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```
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```
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> db cache events **
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COLUMN PCT HITS MISSES INSERT CACHED CAPACITY INSERT TOTAL LOCKED
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content 17.85% 2113271 85256 83255 22.85 MiB (23962992) 128.00 MiB (134217728) 569.37 MiB (597026848) 0.00 B (0)
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depth 90.71% 11292 96431 96431 58.06 MiB (60876968) 64.00 MiB (67108864) 59.68 MiB (62575248) 0.00 B (0)
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event_id 9.24% 191518 153523 153523 5.92 MiB (6202768) 64.00 MiB (67108864) 865.07 MiB (907093240) 0.00 B (0)
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origin_server_ts 99.99% 9852 566483 566258 64.00 MiB (67103832) 64.00 MiB (67108864) 353.29 MiB (370455584) 0.00 B (0)
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room_id 99.99% 1015939 216695 216694 63.99 MiB (67102496) 64.00 MiB (67108864) 132.05 MiB (138467768) 1.93 MiB (2019088)
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sender 39.18% 56357 80879 80879 50.16 MiB (52592768) 128.00 MiB (134217728) 50.36 MiB (52809616) 0.00 B (0)
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state_key 40.49% 7336 89035 87181 25.91 MiB (27171856) 64.00 MiB (67108864) 383.42 MiB (402049648) 0.00 B (0)
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type 99.92% 1716885 66485 66485 31.97 MiB (33527264) 32.00 MiB (33554432) 40.69 MiB (42667312) 0.00 B (0)
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_event_idx 99.99% 652575 505956 505955 255.98 MiB (268418416) 256.00 MiB (268435456) 635.40 MiB (666268064) 23.45 KiB (24016)
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_room_events 62.14% 308312 13144 13144 79.54 MiB (83405864) 128.00 MiB (134217728) 79.73 MiB (83608112) 284.73 KiB (291560)
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_room_joined 52.73% 2087968 6789 6789 4.22 MiB (4422936) 8.00 MiB (8388608) 4.23 MiB (4431280) 0.00 B (0)
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_room_state 25.40% 2038549 21590 21590 16.25 MiB (17044504) 64.00 MiB (67108864) 52.26 MiB (54793600) 0.00 B (0)
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_room_head 26.41% 7986 9435 9435 2.11 MiB (2215192) 8.00 MiB (8388608) 37.56 MiB (39389688) 0.00 B (0)
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_event_json 62.79% 82254 1166164 1166153 642.96 MiB (674189112) 1024.00 MiB (1073741824) 736.76 MiB (772552224) 3.52 MiB (3690824)
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_event_refs 79.17% 54501 112508 112505 50.67 MiB (53127080) 64.00 MiB (67108864) 68.76 MiB (72098088) 0.00 B (0)
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_event_type 99.77% 22 8215 8215 15.96 MiB (16738848) 16.00 MiB (16777216) 17.27 MiB (18109240) 73.93 KiB (75704)
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_event_sender 0.00% 0 23453 23453 0.00 B (0) 16.00 MiB (16777216) 15.01 MiB (15739768) 0.00 B (0)
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_event_horizon 99.96% 15722 18296 18296 15.99 MiB (16769768) 16.00 MiB (16777216) 18.91 MiB (19833200) 0.00 B (0)
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_room_state_space 67.24% 3997 24712 24712 86.06 MiB (90241400) 128.00 MiB (134217728) 92.28 MiB (96762256) 0.00 B (0)
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```
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To view the configuration item for the size of a cache, which should match your
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output from the above command, use the following command where `<COLUMN>` is
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replaced by one of the names under `COLUMN` in the above output:
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```
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conf ircd.m.dbs.events.<COLUMN>.cache.size
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```
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To alter a cache size, set the configuration item with a byte value. In the
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example below we will set the `_event_json` cache size to 256 MiB. This change
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will take effect immediately and the cache will grow or shrink to that size.
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```
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conf set ircd.m.dbs.events._event_json.cache.size 268435456
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```
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> Tip: The best metric to figure out which caches are inadequate is not
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necessarily the utilization percentage. Caches that are too small generally
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exhibit high values under `INSERT TOTAL` as well as full utilization. If this
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value is several times higher than the cache size and growing, consider
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increasing that cache's size.
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### Client Pool Tuning
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(TODO)
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