Review request (S): 7179517 Enable NUMA by default on NUMA hardware

Eric Caspole eric.caspole at
Mon Jul 2 17:24:27 UTC 2012

I am hoping one of you guys can do it - I have never used Solaris and  
I don't know if there is any special thing to take into account there.

On Jul 2, 2012, at 12:07 PM, Vladimir Kozlov wrote:

> Why there is no changes for Solaris?
> Vladimir
> On 7/2/12 3:57 AM, Jesper Wilhelmsson wrote:
>> Hi,
>> This change is to turn on UseNUMA per default on NUMA hardware. It  
>> has been contributed by Eric Caspole. I'm fine with
>> the change but we need at least one official reviewer.
>> Webrev:
>> Testing:
>> I ran it through JPRT and did some local sanity testing.
>> Eric has tested this on SPECjbb2005 and SPECjvm2008 with a variety  
>> of heap sizes and it is never worse than the current
>> default. In some cases, especially with Windows, running a test  
>> with the current default and getting bad NUMA placement
>> will be about 3x slower than the +UseNUMA score.
>> The performance team are involved to perform some larger scale  
>> testing.

More information about the hotspot-gc-dev mailing list