[mkgmap-dev] tile takes very long time to generate

Mon Mar 8 05:53:05 GMT 2021

Hi.

I observe a situation that one of the very first tiles (often the first or the 
third) that mkgmap generates takes 20 - 30 minutes to generate, wheres the 
others take about 30 seconds each.

The map data produced by splitter is a total of around 700 files with splitter 
option --max-nodes=1275000.

sea and bouds are used for mkgmap.

At first i thought i am running low on memory but changing to max-jobs=1 
(instead of the possible max of 2) did not make any change.

Is mkgmap doing something specific in the beginning that can explain this long 
time generating one of the very first tiles?

I can provide more details, let me know how i can best collect those details 
in case i need to set some parameters to have mkgmap to say more about what it 
is doing.

Regards
Karl