Disable Java JIT for a specific method/class?

Question

I'm having an issue in my Java application where the JIT breaks the code. If I disable the JIT, everything works fine, but runs 10-20x slower.

Is there any way to disable the JIT for a specific method or class?

Edit: I'm using Ubuntu 10.10, getting the same results both with:

OpenJDK Runtime Environment (IcedTea6 1.9) (6b20-1.9-0ubuntu1)
OpenJDK 64-Bit Server VM (build 17.0-b16, mixed mode)

and:

Java(TM) SE Runtime Environment (build 1.6.0_16-b01)
Java HotSpot(TM) 64-Bit Server VM (build 14.2-b01, mixed mode)

Did you file a bug already? Or did you find an existing bug, which describes your problem? — soc
– soc, Commented Oct 23, 2010 at 14:20
Sounds very unlikely that it's due to the JIT, no? Couldn't it be due to a race-condition (since the timing changes when you disable jit)... — aioobe
– aioobe, Commented Oct 23, 2010 at 14:34
I'm only using a single thread. I'm busy looking into the bug, but don't really have the time right now. The bug occurs consistently after a specific method has been compiled by the JIT. For now I'm just setting the -XX:CompileThreshold option high enough. — Ralf
– Ralf, Commented Oct 23, 2010 at 14:53
Blaming the JVM should usually be pretty far down the list :) — bwawok
– bwawok, Commented Oct 23, 2010 at 17:00

Ralf · Accepted Answer · 2010-10-23 15:15:03Z

10

The following option works on my JVMs, to exclude a specific method:

-X:CompileCommand=exclude,the/package/and/Class,methodName

answered Oct 23, 2010 at 15:15

Ralf

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3 Comments

Alexey Ivanov Over a year ago

Sun/Oracle Java 6 and above use -XX:CompileCommand option. See java options for more information, specifically for v8.

nanofarad Over a year ago

Sorry to dig up such an old post; if I were to use this with a named inner class would I delimit it as com/domain/package/Outer/Inner or com/domain/package/Outer$Inner?

TsReaper Over a year ago

I encountered the same problem today. After some experimenting, it seems that we should use com/domain/package/Outer$Inner.

soc · Accepted Answer · 2010-10-23 14:05:47Z

6

Yes, there is one. You can supply the affected classes you want to exclude JIT compilation at start-up:

-Xjit:exclude={package/class.method|package/class.method}

answered Oct 23, 2010 at 14:05

soc

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2 Comments

Ralf Over a year ago

I get "Unrecognized option: -Xjit:exclude={...} Could not create the Java virtual machine."

robert_x44 Over a year ago

-X options are nonstandard. They may change between versions, and are dependent on your JVM

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