[Engine-devel] Fixed -Xmx could kill your JVM

[Shireesh Anjal]

On Wednesday 12 September 2012 06:36 PM, Alon Bar-Lev wrote:
>
> ----- Original Message -----
>> From: "Juan Hernandez" <jhernand at redhat.com>
>> To: "Laszlo Hornyak" <lhornyak at redhat.com>
>> Cc: engine-devel at 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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