diff options
Diffstat (limited to 'notes')
| -rw-r--r-- | notes/postgres_performance.txt | 169 | ||||
| -rw-r--r-- | notes/postgres_tuning.txt | 8 |
2 files changed, 117 insertions, 60 deletions
diff --git a/notes/postgres_performance.txt b/notes/postgres_performance.txt index 8f87d5c6..cd2a5162 100644 --- a/notes/postgres_performance.txt +++ b/notes/postgres_performance.txt @@ -1,5 +1,78 @@ -## 2018-06-27 Measurements +## Setup + +Add to postgres.conf: + + shared_preload_libraries = 'auto_explain,pg_stat_statements' + + # Increase the max size of the query strings Postgres records + track_activity_query_size = 2048 + + # Track statements generated by stored procedures as well + pg_stat_statements.track = all + +Also: + + track_counts (already default) + autovacuum (already default?) + log_min_error = warning + log_min_duration_statement = 5000 + +Then from shell: + + create extension pg_stat_statements; + +Regularly want to run: + + VACUUM ANALYZE + +## Tuning Values + +postgres config: + + max_connections = 100 (default) + shared_buffers = 128MB -> 10GB (while elastic on same machine; later 16 or more) + effective_cache_size = 4GB -> 24GB (while elastic on same machine) + work_mem = 4MB -> 128MB # relatively few connections/box + fsync = on + commit_delay = ??? (and siblings) + random_page_cost = 1 (for SSD) + default_statistics_target = 100 -> 200 + maintenance_work_mem = 64MB -> 8GB + synchronous_commit = off (during dev only! switch to on for production!) + wal_sync_method (keep default) + max_wal_size = 64 -> 128 (based on above HINT message) + # didn't mess with commit_delay/commit_siblings + +system: + + sysctl -w vm.overcommit_memory=2 + TODO: ulimit -n 65536 + TODO: ulimit -p 800 + LimitNOFILE + /lib/systemd/system/postgresql.service + +## Resources + +https://www.geekytidbits.com/performance-tuning-postgres/ + +Could try pgbadger to handle auto_explain type output. + +https://www.postgresql.org/docs/10/static/runtime-config-wal.html + +IA-specific resources: + https://git.archive.org/ia/mint/blob/master/postgres/postgres_9_2.yml + https://git.archive.org/ia/mint/blob/master/postgres/put_datadir_on_ssd.sh + https://git.archive.org/ia/mint/blob/master/postgres/templates/postgresql.conf.j2 + +For bulk inserts: +- make write-ahead-log larger (eg, 16MB. done.) +- transactions of ~1000+ inserts +- https://www.postgresql.org/docs/current/static/populate.html +- https://www.depesz.com/2007/07/05/how-to-insert-data-to-database-as-fast-as-possible/ +- https://stackoverflow.com/questions/12206600/how-to-speed-up-insertion-performance-in-postgresql + +## 2018-06-27 Measurements (pre-tuning) fatcat_prod=# select count(*) from release_ident; 20983019 fatcat_prod=# select count(*) from work_ident; 20988140 @@ -71,68 +144,60 @@ bnewbold@wbgrp-svc500$ uptime work_ident | -65008911 | OK | 1503313920 | 1239 | 65010150 release_rev | -185735794 | OK | 13649428480 | 128 | 185735922 -## Setup +## 2018-06-28 (after basic tuning + indexes) -Add to postgres.conf: +Early loading (manifest and 20x release): - shared_preload_libraries = 'auto_explain,pg_stat_statements' + PostgreSQL 10.4 - wbgrp-svc500.us.archive.org - postgres@localhost:5432/postgres - Ref.: 2s + Size: 4.57G - 6.45M/s | TPS: 18812 + Mem.: 59.70% - 23.62G/49.14G | IO Max: 3601/s + Swap: 1.30% - 675.05M/50.00G | Read : 0.00B/s - 0/s + Load: 12.98 10.58 5.25 | Write: 2.65M/s - 677/s - # Increase the max size of the query strings Postgres records - track_activity_query_size = 2048 - # Track statements generated by stored procedures as well - pg_stat_statements.track = all + PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND + 24045 webcrawl 20 0 908872 204948 11756 S 153.3 0.4 16:13.03 fatcatd + 24328 webcrawl 20 0 78148 45220 4324 R 87.1 0.1 8:44.16 perl + 24056 postgres 20 0 10.441g 3.906g 3.886g R 69.9 7.9 6:57.47 postgres + 24063 postgres 20 0 10.447g 3.899g 3.873g S 67.9 7.9 6:55.89 postgres + 24059 postgres 20 0 10.426g 3.888g 3.883g R 67.5 7.9 6:59.15 postgres + 24057 postgres 20 0 10.430g 3.883g 3.874g S 67.2 7.9 6:58.68 postgres + 24061 postgres 20 0 10.448g 3.909g 3.881g R 66.2 8.0 6:54.30 postgres + 24058 postgres 20 0 10.428g 3.883g 3.876g R 65.9 7.9 6:59.35 postgres + 24062 postgres 20 0 10.426g 5.516g 5.511g R 64.9 11.2 6:58.29 postgres + 24055 postgres 20 0 10.426g 3.878g 3.873g R 64.2 7.9 6:59.38 postgres + 24054 postgres 20 0 10.430g 5.499g 5.491g R 63.6 11.2 6:57.27 postgres + 24060 postgres 20 0 10.448g 3.900g 3.873g R 61.9 7.9 6:55.45 postgres + 21711 postgres 20 0 10.419g 5.762g 5.760g D 16.6 11.7 3:00.67 postgres + 21713 postgres 20 0 10.419g 21432 19512 S 11.3 0.0 3:25.11 postgres + 24392 webcrawl 20 0 5309636 400912 8696 S 7.9 0.8 0:53.18 python3 + 24383 webcrawl 20 0 5309436 400628 8648 S 7.6 0.8 0:52.29 python3 + 24387 webcrawl 20 0 5309776 402968 8620 S 7.3 0.8 0:52.81 python3 + 24394 webcrawl 20 0 5309624 400732 8644 S 7.3 0.8 0:53.30 python3 + 24384 webcrawl 20 0 5309916 400948 8600 S 7.0 0.8 0:53.18 python3 -Also: - - track_counts (already default) - autovacuum (already default?) - log_min_error = warning - log_min_duration_statement = 5000 +Still get a *lot* of: -Then from shell: + 2018-06-29 00:14:05.948 UTC [21711] LOG: checkpoints are occurring too frequently (1 second apart) + 2018-06-29 00:14:05.948 UTC [21711] HINT: Consider increasing the configuration parameter "max_wal_size". - create extension pg_stat_statements; +VACUUM is running basically continuously; should prevent that? 6 hours or +longer on release_rev and release_ref tables. An auto-approve batch method +would resovle this, I think (no update after insert). -Regularly want to run: +max_wal_size wasn't getting set correctly. - VACUUM ANALYZE +The statements taking the most time are the complex inserts (multi-table +inserts); they take a fraction of a second though (mean less than a +milisecond). -## Tuning Values +Manifest import runs really slow if release import is concurrent; much faster +to wait until release import is done first (like a factor of 10x or more). -postgres config: +With some 60 million releases: - max_connections = 100 (default) - shared_buffers = 128MB -> 10GB (while elastic on same machine; later 16 or more) - effective_cache_size = 4GB -> 24GB (while elastic on same machine) - work_mem = 4MB -> 128MB # relatively few connections/box - fsync = on - commit_delay = ??? (and siblings) - random_page_cost = 1 (for SSD) - default_statistics_target = 100 -> 200 - maintenance_work_mem = 64MB -> 8GB - synchronous_commit = off (during dev only! switch to on for production!) - wal_sync_method (keep default) - max_wal_size = 64 -> 128 (based on above HINT message) - # didn't mess with commit_delay/commit_siblings + bnewbold@wbgrp-svc500$ sudo du -sh /var/lib/postgresql/ + 184G /var/lib/postgresql/ -system: +TODO: slow query log doesn't seem to be working (let alone auto_explain) - sysctl -w vm.overcommit_memory=2 - TODO: ulimit -n 65536 - TODO: ulimit -p 800 - LimitNOFILE - /lib/systemd/system/postgresql.service - -## Resources - -https://www.geekytidbits.com/performance-tuning-postgres/ - -Could try pgbadger to handle auto_explain type output. - -https://www.postgresql.org/docs/10/static/runtime-config-wal.html - -IA-specific resources: - https://git.archive.org/ia/mint/blob/master/postgres/postgres_9_2.yml - https://git.archive.org/ia/mint/blob/master/postgres/put_datadir_on_ssd.sh - https://git.archive.org/ia/mint/blob/master/postgres/templates/postgresql.conf.j2 diff --git a/notes/postgres_tuning.txt b/notes/postgres_tuning.txt deleted file mode 100644 index d1e353da..00000000 --- a/notes/postgres_tuning.txt +++ /dev/null @@ -1,8 +0,0 @@ - -For bulk inserts: - -- make write-ahead-log larger (eg, 16MB) -- transactions of ~1000+ inserts -- https://www.postgresql.org/docs/current/static/populate.html -- https://www.depesz.com/2007/07/05/how-to-insert-data-to-database-as-fast-as-possible/ -- https://stackoverflow.com/questions/12206600/how-to-speed-up-insertion-performance-in-postgresql |