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[mkgmap-dev] [PATCH V3]mkgmap performance

From Steve Ratcliffe steve at parabola.me.uk on Fri Dec 30 23:36:29 GMT 2011


>  > No its not expected. In fact it appears to happen even for max-jobs=1
>  > when you compile the same file twice on the same run. I will try to
>  > track that down too.
> okay, thanks. Is this related to IdentityHashMaps ?

Well I've found it. Don't know why it took so long as it was exactly
what I thought it might be in the first place!

It is FakeIdGenerator - there is only one that is shared across all 
maps, rather than a separate one being used for each map.

Because of the way that it is used, this is difficult to fix.

If you modify it to always return the same id then the differences go 
away on my test map. However the map is smaller than the one made 
without the mod, so it looks like it is absolutely essential that the 
ids are different and this is no solution, maybe not even for testing of 
performance changes.


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