Default UseTLAB on Zero

[Christian Thalinger]

On Feb 20, 2012, at 4:47 PM, Xerxes Rånby wrote:

> 2012-02-20 14:26, Andrew Haley skrev:
>> I noticed that, on Zero, UseTLAB defaults to false, because of this
>> code:
>> 
>> #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
>> define_pd_global(bool, BackgroundCompilation,        false);
>> define_pd_global(bool, UseTLAB,                      false);
>> ...
>> 
>> I don't understand why this is.  Surely it only pointlessly slows
>> down Zero.  Any ideas?
>> 
>> Thanks,
>> Andrew.
> 
> OK!
> 
> I checked the jdk6 hotspot log http://hg.openjdk.java.net/jdk6/jdk6/hotspot/annotate/20dbc199874e/src/share/vm/runtime/globals.hpp      it have been turned off since the initial  duke at 0   commit.
> 
> Shark have always used UseTLAB and ResizeTLAB true in its shark_globals_zero.hpp .
> 
> I think this part have simply been missed to be turned ON for Zero builds.

It's this push:

http://hg.openjdk.java.net/jdk6/jdk6/hotspot/rev/d2ede61b7a12

We should ask Gary why it's turned off.

-- Chris

> 
> Xerxes
> 
>