On Wednesday 12 September 2012 06:36 PM, Alon Bar-Lev wrote:
----- Original Message -----
From: "Juan Hernandez" <jhernand@redhat.com> To: "Laszlo Hornyak" <lhornyak@redhat.com> Cc: engine-devel@ovirt.org Sent: Wednesday, September 12, 2012 3:57:33 PM Subject: Re: [Engine-devel] Fixed -Xmx could kill your JVM <snip>
Worst case we can change the defaults for ENGINE_HEAP_MIN and ENGINE_HEAP_MAX to get that behavior, for example:
ENGINE_HEAP_MIN=128m ENGINE_HEAP_MAX=1g
I am open to do that change, specially if you show me hard data proving that it is better for performance ;-) .
We are talking about virtual memory, allocation of the heap is done as reserved, so there is no real impact on the system if memory is unused. When a reserved page is actually used it is committed.
Unless there is a system with small page file, there is no real reason to use lower values in HEAP_MIN.
Alon.
I've seen that Java experts from Sun (now Oracle) recommend to identify a good (high enough) value for the heap size and set the same value for both min and max, during the sessions on Java performance in the Java One conference.
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