Re: Patch speed problems

Michael Blunck wrote:
  > With regard to the DB Set, I doubt that. In v0.82 there´s no basic
> difference between freight waggons. OTOH, the 194 is implemented as an
> articulated locomotive using a callback, so it would be of interest if
> this phenomenon would be restricted to those types of engines (all steam
> engines w. tenders, 194, 195).

Ok, I did more testing. I started a new random game, cheated into 1955 
and bought a BR 85 (engine doesn't matter anyway as I found out) + 17 
refrigerator wagons, which is my usual train length. As soon as the 
train starts moving, CPU usage hits 100%, as long as the train window is 
open. Stopping the train or closing the window reduces the CPU load.

Disabling all grf except DBSetXL solved the problem, so I started 
testing all other grf for dependencies. The problematic grf seems to be 
newcargow.grf, all other grfs of my conficuration did not have any 
effect on performance. It also happens if all grf except for DBSetXL and 
NewCargos are disabled.

Next observation: Impact depends on train length. A BR85 and trains of 
varying length were used, all with refrigerator wagons. The longer the 
train, the heavier the impact on performance, with each wagon adding 
about 5-10% CPU usage.

Last test: all freight wagons and their impact on performance. Again, 
random new game, NewCargos enabled, and cheated into 2000. Each train 17 
wagons, pulled by BR232.

without train windows open: 5-10% CPU usage
short open wagon, short closed wagon: 30% CPU usage
low open wagon, gondola wagon:        40%
stake wagon, tanker:                  80%
refrigerator:                        100%
all others: no visible effects on CPU usage

That's what I found out, hope it gives any clues about the causes.

Greets,
Uwe

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