Can I disable the use of more than two cores temporarily?

[NoPartyHats]

So I just got a new PC with a nice quad-core in it. I go onto minecraft, and try to play. The problem is, every 5 seconds the game goes from 60 to 8 fps. I looked it up and I read that Minecraft doesn't play well with more than 2 cores. Now my question is, can I disable 2 so I can play my game, or am I fucked?

Or, do I have the wrong idea, and it's something different?

[ipha]

Minecraft works just fine on a quad-core. What you found may have been referring to how may cores it can actually use.

Anyway, what graphics card do you have and are your drivers up to date?

[NoPartyHats]

I use a ATI Radeon HD 5850.

I'll try to update my drivers off of Steam, and I'll get back to you.

[jordguitar]

[QUOTE=No Party Hats;30673833]So I just got a new PC with a nice quad-core in it. I go onto minecraft, and try to play. The problem is, every 5 seconds the game goes from 60 to 8 fps. I looked it up and I read that Minecraft doesn't play well with more than 2 cores. Now my question is, can I disable 2 so I can play my game, or am I fucked?

Or, do I have the wrong idea, and it's something different?[/QUOTE]
Yes you can set the affinity for the javaw.exe process.

Open task manager
Right click minecraft launcher or minecraft and click go to process
Right click the javaw.exe process and select set affinity
uncheck core 2 and 3 and click ok

[NoPartyHats]

Updated Drivers, tried the Affinity, didn't work. This is no good :frown:

[FlapadarV2]

Make a little java app that spams System.gc()

[editline]25th June 2011[/editline]

and run that when playing minecraft.

[NoPartyHats]

I don't know how to do that.

[editline]24th June 2011[/editline]

Brilliant, it looks like when minecraft hits 50 FPS these problems start. When I try to record it with Fraps, it lowers down to 30 (Which is perfectly fine) and this issue never happens. What do I do.

[Phrozen99]

Weird, I have a quad core and a 5850 with the latest drivers and minecraft works great.

[aVoN]

[QUOTE=FlapadarV2;30689292]Make a little java app that spams System.gc()

[editline]25th June 2011[/editline]

and run that when playing minecraft.[/QUOTE]

Isn't the garbage collector independent from each VM? So if app A runs it, it will only affect the VM of app A and not app B. I'm not that sure about it, but if so, that idea is useless :(

[editline]28th June 2011[/editline]

[QUOTE=No Party Hats;30689305]I don't know how to do that.

[editline]24th June 2011[/editline]

Brilliant, it looks like when minecraft hits 50 FPS these problems start. When I try to record it with Fraps, it lowers down to 30 (Which is perfectly fine) and this issue never happens. What do I do.[/QUOTE]

Here: [url]http://files.daggeringcats.com//FacePunch/java_gc.zip[/url]

Sourcecode: gc.java
Compiled Binary: gc.class

How to execute: Install Java and execute run.bat or run [i]java gc[/i] from within that folder.

Runs the gc every 5 seconds. No idea if it helps (read my concerns above)