Re: [Wrapper-user] A Question About Wrapper Max Memory Settings

[Christian M. <chr...@ta...>]

Hello Geoff,

Happy New Year!

If both properties, i.e. *memory and *memory.percent, are specified, then
*memory takes precedence over the percentage.

The *.percent property specifies the percentage of the total physical
memory of the machine will be used.
So in this case available actually means the total amount of memory
available on the system, and not the available free amount of memory on the
system. I'm sorry if this was misleading, I will update the documentation,
to make it clearer.

Furthermore, will the Wrapper not consider the virtual memory (swap) for
the percentage. In fact I think if possible it should always be avoided
that a JVM will be swapped, since the performance drop is very significant.

On a 32-bit system, please also note that it is not possible for a process
to address more than 2GB memory. Therefore if the memory assignment for
init- and maxmemory would exceed 2GB, the Wrapper will automatically adjust
the value to 2GB.

Please let me know if you have any further question.

Thank you,

Christian Mueller
Tanuki Software, Ltd.


On Tue, Jan 8, 2013 at 6:42 PM, <geo...@rb...> wrote:

> **
> What happens when both the 'wrapper.java.maxmemory.percent' and the
> 'wrapper.java.maxmemory' settings are used?
>
> Which setting takes precedence or do they work together?
>
> Also the help files mention "memory thresholds relative to the amount of
> physical memory available on the system". Does available mean total
> installed memory or the amount of memory currently free? Does "physical
> memory" mean just the actual "physical" memory or does it include swap
> space?
>
> For example, on a 64 bit system we have 32GB of memory, 30Gb of that
> free.
>
> If wrapper.java.maxmemory is set to 4096M and the wrapper.java.maxmemory
> .percent is set to 90%; is the Java max memory set to 4GB or ~29GB (90%
> of 32GB) or ~27GB (90% of 30GB)?
>
> If we now add a further 32GB of swap, giving a virtual total of 64GB of
> memory how does that affect things?
>
> Thanks.
>
>
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