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doc: clarify the influence of autovacuum on memory

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Sarah Hoffmann
2020-01-22 12:02:38 +01:00
parent 69e31baf68
commit 2edc15dfb8
1 changed files with 12 additions and 3 deletions
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docs/admin/Installation.md
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@@ -26,7 +26,7 @@ For compiling:
* [cmake](https://cmake.org/) * [cmake](https://cmake.org/)
* [libxml2](http://xmlsoft.org/) * [libxml2](http://xmlsoft.org/)
* a recent C++ compiler * a recent C++ compiler (gcc 5+ or Clang 3.8+)
Nominatim comes with its own version of osm2pgsql. See the Nominatim comes with its own version of osm2pgsql. See the
[osm2pgsql README](https://github.com/openstreetmap/osm2pgsql/blob/master/README.md#building) [osm2pgsql README](https://github.com/openstreetmap/osm2pgsql/blob/master/README.md#building)
@@ -89,14 +89,23 @@ The numbers in brackets behind some parameters seem to work fine for
means that PostgreSQL needs to run checkpoints less often but it does require means that PostgreSQL needs to run checkpoints less often but it does require
the additional space on your disk. the additional space on your disk.
Autovacuum must not be switched off because it ensures that the
tables are frequently analysed. If your machine has very little memory,
you might consider setting:
autovacuum_max_workers = 1
and even reduce `autovacuum_work_mem` further. This will reduce the amount
of memory that autovacuum takes away from the import process.
For the initial import, you should also set: For the initial import, you should also set:
fsync = off fsync = off
full_page_writes = off full_page_writes = off
Don't forget to reenable them after the initial import or you risk database Don't forget to reenable them after the initial import or you risk database
corruption. Autovacuum must not be switched off because it ensures that the corruption.
tables are frequently analysed.
### Webserver setup ### Webserver setup