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

[Igor Veresov]

Jesper,

What about Solaris?
Also it would be nice to know if the error messages from libnuma on Linux are successfully suppressed.

igor

On Jul 2, 2012, at 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:
> http://cr.openjdk.java.net/~jwilhelm/7179517/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.
>