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

Vladimir Kozlov vladimir.kozlov at
Mon Jul 2 16:07:20 UTC 2012

Why there is no changes for Solaris?


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.

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