frozen editor while panning or zooming of the map

[Stephan Knauss]

Hello,

On 11.09.2018 23:06, Stephan Knauss wrote:
> http://downloads.osm-tools.org/josm-custom-2018-09-11(7).zip

Another question regarding the blocked painting.
If I get the stack right, we are inside the painting loop in
org.openstreetmap.josm.gui.layer.AbstractTileSourceLayer.drawInViewArea(Graphics2D, 
MapView, ProjectionBounds) AbstractTileSourceLayer.java:1514

What is the reason that here tiles are loaded and not simply painted? If 
tiles are available, they can be painted. If tiles are due to be loaded 
this is something to expected to take longer, so why not offloading this 
to a later point in time?

Or maybe it was intended to do so? The (before mentioned) 
JCSCachedTileLoaderJob.submit() might do this. But according to the 
profiler this method then takes away 71% of the time in the painting 
loop. In my case multiple seconds.

Later on a lot of time is spent here:
HostLimitQueue.java:143 <...> 
java.util.concurrent.ThreadPoolExecutor.setCorePoolSize(int)

which seems to be part of a "trick" to exploit a side effect of the 
method. Looks like this was implemented by wiktorn.

Shall I create a ticket with the details up to now to better track it?

The following snippet os a call stack of what I believe a single call.

"Name","Level"
"AWT-EventQueue-0  Runnable CPU usage on sample: 234ms","1"
"java.util.concurrent.ThreadPoolExecutor.setCorePoolSize(int)","2"
"org.openstreetmap.josm.data.cache.HostLimitQueue.offer(Runnable) 
HostLimitQueue.java:143","2"
"org.openstreetmap.josm.data.cache.HostLimitQueue.offer(Object) 
HostLimitQueue.java:30","2"
"java.util.concurrent.ThreadPoolExecutor.execute(Runnable)","2"
"org.openstreetmap.josm.data.cache.JCSCachedTileLoaderJob.submit(ICachedLoaderListener, 
boolean) JCSCachedTileLoaderJob.java:168","2"
"org.openstreetmap.josm.data.imagery.TMSCachedTileLoaderJob.submit(boolean) 
TMSCachedTileLoaderJob.java:150","2"
"org.openstreetmap.josm.gui.layer.AbstractTileSourceLayer.loadTile(Tile, 
boolean) AbstractTileSourceLayer.java:891","2"
"org.openstreetmap.josm.gui.layer.AbstractTileSourceLayer.access$100(AbstractTileSourceLayer, 
Tile, boolean) AbstractTileSourceLayer.java:141","2"
"org.openstreetmap.josm.gui.layer.AbstractTileSourceLayer$TileSet.loadAllTiles(boolean) 
AbstractTileSourceLayer.java:1272","2"
"org.openstreetmap.josm.gui.layer.AbstractTileSourceLayer$TileSet.access$1000(AbstractTileSourceLayer$TileSet, 
boolean) AbstractTileSourceLayer.java:1183","2"
"org.openstreetmap.josm.gui.layer.AbstractTileSourceLayer.drawInViewArea(Graphics2D, 
MapView, ProjectionBounds) AbstractTileSourceLayer.java:1514","2"
"org.openstreetmap.josm.gui.layer.AbstractTileSourceLayer.access$2700(AbstractTileSourceLayer, 
Graphics2D, MapView, ProjectionBounds) AbstractTileSourceLayer.java:141","2"
"org.openstreetmap.josm.gui.layer.AbstractTileSourceLayer$TileSourcePainter.doPaint(MapViewGraphics) 
AbstractTileSourceLayer.java:1892","2"
"org.openstreetmap.josm.gui.layer.AbstractTileSourceLayer$TileSourcePainter.paint(MapViewGraphics) 
AbstractTileSourceLayer.java:1886","2"
"org.openstreetmap.josm.gui.MapView.paintLayer(Layer, Graphics2D) 
MapView.java:468","2"
"org.openstreetmap.josm.gui.MapView.drawMapContent(Graphics2D) 
MapView.java:583","2"
"org.openstreetmap.josm.gui.MapView.paint(Graphics) MapView.java:490","2"
"java.awt.EventDispatchThread.run()","2"