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Merge pull request #1578 from lonvia/docs-installation-support

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Update installation documentation wrt memory usage
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Sarah Hoffmann
2019-11-26 22:21:45 +01:00
committed by GitHub
parent d9fe25ac2e 0bd006eef8
commit c36896c524
5 changed files with 74 additions and 29 deletions
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docs/admin/Installation.md
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@@ -55,15 +55,15 @@ For running continuous updates:
### Hardware
A minimum of 2GB of RAM is required or installation will fail. For a full
planet import 32GB of RAM or more are strongly recommended.
planet import 64GB of RAM or more are strongly recommended. Do not report
out of memory problems if you have less than 64GB RAM.
For a full planet install you will need at least 700GB of hard disk space
For a full planet install you will need at least 800GB of hard disk space
(take into account that the OSM database is growing fast). SSD disks
will help considerably to speed up import and queries.
On a 6-core machine with 32GB RAM and SSDs the import of a full planet takes
a bit more than 2 days. Without SSDs 7-8 days are more realistic.
Even on a well configured machine the import of a full planet takes
at least 2 days. Without SSDs 7-8 days are more realistic.
## Setup of the server
@@ -73,17 +73,21 @@ You might want to tune your PostgreSQL installation so that the later steps
make best use of your hardware. You should tune the following parameters in
your `postgresql.conf` file.
shared_buffers (2GB)
maintenance_work_mem (10GB)
work_mem (50MB)
effective_cache_size (24GB)
shared_buffers = 2GB
maintenance_work_mem = (10GB)
autovacuum_work_mem = 2GB
work_mem = (50MB)
effective_cache_size = (24GB)
synchronous_commit = off
checkpoint_segments = 100 # only for postgresql <= 9.4
max_wal_size = 1GB # postgresql > 9.4
checkpoint_timeout = 10min
checkpoint_completion_target = 0.9
The numbers in brackets behind some parameters seem to work fine for
32GB RAM machine. Adjust to your setup.
64GB RAM machine. Adjust to your setup. A higher number for `max_wal_size`
means that PostgreSQL needs to run checkpoints less often but it does require
the additional space on your disk.
For the initial import, you should also set: