Opened 13 years ago
Last modified 13 years ago
#7914 closed enhancement
[PATCH] Concurrent fetching of primitives — at Initial Version
| Reported by: | Don-vip | Owned by: | team |
|---|---|---|---|
| Priority: | major | Milestone: | |
| Component: | Core | Version: | |
| Keywords: | performance, multithread, multicore | Cc: |
Description
The OSM API usage policy allows us to use 2 download threads:
http://wiki.openstreetmap.org/wiki/API_usage_policy#Technical_Usage_Requirements
There is a place in JOSM where I have achieved to improve dramatically the performances in fetching a large number of primitives (I used as example the multipolygon 1155338 which contains more than 12k nodes). With this patch, download time fell from 3min50s to 1min42s on my machine !
However, I'd like to have some code review and some testing before committing.
I am particularly afraid of the handling of ProgressMonitor. I was expecting to get some ConcurrentModificationExceptions. I did not get any problem, but I don't know if I was lucky or if the code is OK :)
