Florian
- csdt
- csdt
- Europe/Stockholm
- Yes
- No
MC-128905
Normal
The water updates seem to be roughly 10x slower than on 1.12 on server side.
A quick test to exhibit this behavior:
- create a flat world
- /fill ~-100 ~ ~ ~100 ~ ~ water
- wait for the water to flow completely
- /fill ~-100 ~ ~ ~100 ~ ~ air
When the water is removed I recorded a peak at 81 mspt on 1.13 and a peak at (roughly) 8 mspt on 1.12.2.
This makes flushing mob farms unusable: on my survival world, I get peaks > 150 mspt.
The mspt measurment on 1.12 is a bit tricky as there is no way to measure it properly:
I used /forge tps from Forge mod loader to measure it.
The bug
Server-side water updates seem to be roughly 10x slower than in 1.12.
The comparison between 1.12 and 1.13 can be seen in this video by gnembon.Test to exhibit this behavior:
- Create a flat world.
- Execute /fill ~-100 ~ ~ ~100 ~ ~ water
- Wait for the water to flow completely.
- Execute /fill ~-100 ~ ~ ~100 ~ ~ air
When the water is removed I recorded a peak at 81 mspt on 1.13 and a peak at (roughly) 8 mspt on 1.12.2.
This makes flushing mob farms unusable: on my survival world, I get peaks > 150 mspt.
The mspt measurment on 1.12 is a bit tricky as there is no way to measure it properly:
I used /forge tps from Forge mod loader to measure it.Slow down summary
1.12 1.13 18w33a 1.13.1-pre2 create water 4 34 20 14 remove water 8 81 24 18
The bug
Server-side water updates seem to be roughly 10x slower than in 1.12.
The comparison between 1.12 and 1.13 can be seen in this video by gnembon.Test to exhibit this behavior:
- Create a flat world.
- Execute /fill ~-100 ~ ~ ~100 ~ ~ water
- Wait for the water to flow completely.
- Execute /fill ~-100 ~ ~ ~100 ~ ~ air
When the water is removed I recorded a peak at 81 mspt on 1.13 and a peak at (roughly) 8 mspt on 1.12.2.
This makes flushing mob farms unusable: on my survival world, I get peaks > 150 mspt.
The mspt measurment on 1.12 is a bit tricky as there is no way to measure it properly:
I used /forge tps from Forge mod loader to measure it.Slow down summary
1.12 1.13 18w33a 1.13.1-pre2 1.15.1 create water 434201419remove water881241831The bug
Server-side water updates seem to be roughly 10x slower than in 1.12.
The comparison between 1.12 and 1.13 can be seen in this video by gnembon.Test to exhibit this behavior:
- Create a flat world.
- Execute /fill ~-100 ~ ~ ~100 ~ ~ water
- Wait for the water to flow completely.
- Execute /fill ~-100 ~ ~ ~100 ~ ~ air
When the water is removed I recorded a peak at 81 mspt on 1.13 and a peak at (roughly) 8 mspt on 1.12.2.
This makes flushing mob farms unusable: on my survival world, I get peaks > 150 mspt.
The mspt measurment on 1.12 is a bit tricky as there is no way to measure it properly:
I used /forge tps from Forge mod loader to measure it.Slow down summary
1.12 1.13 18w33a 1.13.1-pre2 1.15.1 20w27a create water 4 34 20 14 19 10 remove water 8 81 24 18 31 16
I fail to see the how it relates to MC-123263.
MC-123263 is about client performance (Frames Per Second) while this bug is about server performance (Ticks Per Second).
It is much better in 18w33a, but it is still much slower than in 1.12: I recorded a tick time of 24 mspt, which is 3 times slower than 1.12.
As a side note, the performance hit now looks symetric (same slow down when putting water than when removing water).
That was not the case in 1.12, so it might be good to sum up the results in a table:
So the water in 18w33a is still x3-x5 slower than in 1.12.
As far as I can understand: yes.
MC-136107was not out when I started to write this bug report though.It is still in 1.13.1-pre2, but the performance keeps increasing. I just put the new times in the description.
Good job in tracking down the issue bit by bit: keep going
@violine1101 I just redid the test on my machine (the one used in the original post), and my timings are comparable to yours.
One thing to notice though, now that we have mspt chart, we can see that the maximum mspt is much higher than what we saw (more than 100 mspt), and the ~20mspt is an average over a handful of ticks.
On 20w27a, I got ~10 mspt on water creation and ~16 mspt on water removal.
I attached a screenshot where we can see the mspt graph.
The average mspt for a complete cycle is 11 mspt with a peak at 124 mspt.
I also attached a world save for 20w27a with a clock to facilitate testing.
Yes, I used chunkbase. But it is not really relevant because I checked in-game. I have also just attached a new in-game screenshot with a map.
@tryashtar This is a newly generated world. This happens in all worlds, just not necessarily as visible as here.