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update README

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Oliver Tonnhofer 2017-11-15 14:22:14 +01:00
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@ -68,19 +68,10 @@ Imposm 3 is much faster than Imposm 2 and osm2pgsql:
* Efficient intermediate cache for reduced IO load during ways and relations building
Some import times from a Hetzner EX 4S server (Intel i7-2600 CPU @ 3.40GHz, 32GB RAM and 2TB software RAID1 (2x2TB 7200rpm SATA disks)) for imports of a 20.5GB planet PBF (2013-06-14) with generalized tables:
* 6:30h in normal-mode
* 13h in diff-mode
osm2pgsql required between 2-8 days in a [similar benchmark (slide 7)](http://www.geofabrik.de/media/2012-09-08-osm2pgsql-performance.pdf) with a smaller planet PBF file (~15GB).
Benchmarks with SSD are TBD.
Import of Europe 11GB PBF with generalized tables:
* 2:20h in normal-mode
An import in diff-mode on a Hetzner PX121-SSD server (Intel Xeon E5-1650 v3 Hexa-Core, 256GB RAM and SSD RAID 1) of a 36GB planet PBF (2017-08-10) with generalized tables and spatial indices, etc. takes around 6:30h. This is for an import that is ready for minutely updates. The non-diff mode is even faster.
It's recommended that the memory size of the server is roughly twice the size of the PBF extract you are importing. For example: You should have 64GB RAM or more for a current (2017) 36GB planet file, 8GB for a 4GB regional extract, etc.
Imports without SSDs will take longer.
Current status
--------------
@ -111,7 +102,7 @@ There are some dependencies:
#### Compiler
You need [Go >=1.5](http://golang.org).
You need [Go >=1.6](http://golang.org).
#### C/C++ libraries
@ -126,17 +117,6 @@ For best performance use [HyperLevelDB][libhyperleveldb] as an in-place replacem
[libgeos]: http://trac.osgeo.org/geos/
[protobuf]: https://code.google.com/p/protobuf/
#### Go libraries
Imposm3 uses the following Go libraries.
- <https://github.com/jmhodges/levigo>
- <https://github.com/golang/protobuf/proto>
- <https://github.com/lib/pq>
- <https://gopkg.in/yaml.v2>
These libraries are already vendorized (i.e. the source code is included in the Imposm repository) and there is no need to install them separately.
#### Compile
Create a [Go workspace](http://golang.org/doc/code.html) by creating the `GOPATH` directory for all your Go code, if you don't have one already:
@ -145,10 +125,6 @@ Create a [Go workspace](http://golang.org/doc/code.html) by creating the `GOPATH
cd go
export GOPATH=`pwd`
Then you need to enable GO15VENDOREXPERIMENT, if you are using Go 1.5. You can skip this if you are using 1.6 or higher:
export GO15VENDOREXPERIMENT=1
Get the code and install Imposm 3:
go get github.com/omniscale/imposm3