Review Request: UseNUMAInterleaving (original) (raw)

Igor Veresov igor.veresov at oracle.com
Tue May 17 09:58:05 PDT 2011

UseNUMA already has this mechanism. If you turn it on it will deactivate itself if the machine is not NUMA. The problem with turning it on by default is that it can be not necessarily beneficial for all applications (however for most of them it is).

igor

On 5/17/11 5:04 AM, Paul Hohensee wrote:

I believe you can get memory geometry info from Solaris on both sparc or intel. Don't know about Windows or Linux. Anyone??

Paul On 5/17/11 5:12 AM, Andrew Haley wrote: On 17/05/11 00:18, Paul Hohensee wrote:

I suggest you just use -XX:+UseNUMA rather than adding a new flag. UseNUMA seems generic enough to cover whatever implementation is best on a particular platform. Indeed. I am worried by the proliferation of command-line optimization flags that have obscure meanings that are difficult to understand by anyone unfamiliar with a particular computer architecture. This sort of tweakage might be mostly used by people doing benchmarking. When should this flag not be used? To make it more useful, is it possible to make any of this the default? Can a system where it is advantageous be autodetected? Andrew.

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