MC-63896High CPU load on superflat
Running a single player flat world, I noticed a constant high CPU load (around 140% of core cycles) from minecraft and, indeed, it couldn't keep up 20 TPS. Using the speed of items through a hopper, I measured it to be running at about 7 TPS. Upon pausing the game, the CPU load drops substantially. I used all minimal video settings including 2-chunk render distance. If I bring up the debug profiler pie chart, it changes very little when pausing the game which leads me to believe it's a server-side issue. FPS remains as good as it has always been.
If it helps, I tested the snapshots dichotomically and found that the issue appears in 14w25b.
Also tried with Java 7 and 8 for same results.
Environment
2.54 GHz Intel Core 2 Duo
NVIDIA GeForce 9400M 256 MB
Mac OS X (x86_64) version 10.9.4
Java Version: 1.6.0_65, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Linked Issues
Created Issue:
High CPU Load
Running a single player flat world, I noticed a constant high CPU load (around 140% of core cycles) from minecraft and, indeed, it couldn't keep up 20 TPS. Using the speed of items through a hopper, I measured it to be running at about 7 TPS. Upon pausing the game, the CPU load drops substantially. I used all minimal video setting including 2-chunk render distance. If I bring up the debug profiler pie chart, it changes very little when pausing the game which leads me to believe it's a server-side issue.
If it helps, I tested the snapshots dichotomically and found that the issue appears in 14w25b.
Also tried with Java 7 and 8 for same results.
Environment
2.54 GHz Intel Core 2 Duo
NVIDIA GeForce 9400M 256 MB
Mac OS X (x86_64) version 10.9.4
Java Version: 1.6.0_65, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Attachments1
Running a single player flat world, I noticed a constant high CPU load (around 140% of core cycles) from minecraft and, indeed, it couldn't keep up 20 TPS. Using the speed of items through a hopper, I measured it to be running at about 7 TPS. Upon pausing the game, the CPU load drops substantially. I used all minimal video setting including 2-chunk render distance. If I bring up the debug profiler pie chart, it changes very little when pausing the game which leads me to believe it's a server-side issue. FPS remains as good as it has always been.
If it helps, I tested the snapshots dichotomically and found that the issue appears in 14w25b.
Also tried with Java 7 and 8 for same results.
Running a single player flat world, I noticed a constant high CPU load (around 140% of core cycles) from minecraft and, indeed, it couldn't keep up 20 TPS. Using the speed of items through a hopper, I measured it to be running at about 7 TPS. Upon pausing the game, the CPU load drops substantially. I used all minimal video settings including 2-chunk render distance. If I bring up the debug profiler pie chart, it changes very little when pausing the game which leads me to believe it's a server-side issue. FPS remains as good as it has always been.
If it helps, I tested the snapshots dichotomically and found that the issue appears in 14w25b.
Also tried with Java 7 and 8 for same results.
![[Mod] CubeTheThird](../../../data/assets/gravatar/cubethethird.jpeg){kind=small}
Please include a crash report from 14w30c or most recent snapshot.
Added 14w30c forced crash report
I noticed this is only an issue on superflat worlds of the Classic Flat and Bottomless Pit presets. I guess it has something to do with having a lot of open area near the bottom of the world.
Improved performance in 14w32a, but still an issue. It runs at 13-16 ticks per second now on certain superflats.
Also happens to me. I uploaded an image of this problem on snapshot 14w34c with task manager.
Related to - if not duplicate - of
MC-58120Affects also 14w34c.
Not happening anymore on Pre-release, fixed. (But still 5%/10% higher than normal/1.7.X)
Most probably caused by
MC-58120Somehow returned to me and this time keeps causing lagspikes. http://i.imgur.com/6qM8Nuo.png