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authorBryan Newbold <bnewbold@robocracy.org>2018-06-29 11:19:56 -0700
committerBryan Newbold <bnewbold@robocracy.org>2018-06-29 11:19:56 -0700
commitcf198ed37b437b5e1c64a29c49810391f40f73d6 (patch)
tree83265b7040f2d7538687f8101e3349fbf051f33a /notes/postgres_performance.txt
parentd304edc994bd1c0620c500a1cda8b948051f84f1 (diff)
downloadfatcat-cf198ed37b437b5e1c64a29c49810391f40f73d6.tar.gz
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more postgres notes
Diffstat (limited to 'notes/postgres_performance.txt')
-rw-r--r--notes/postgres_performance.txt169
1 files changed, 117 insertions, 52 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