ACF10 32 -> 64 bit

[hofar...@houseoffusion.com]

Hi. So we're moving from ACF10 32 bit to ACF10 64 bit. On ACF10 32 bit, we
settled on:

Minimum JVM Heap Size (in MB) 1369
Maximum JVM Heap Size (in MB) 1369

On the ACF10 64 bit box, we have 32 GB of RAM to play with. Given that this
box is just:

ACF10
The OS (Windows Server 2012)
FusionReactor

...what's the best recommendation(s) for min/max heap to guarantee ACF10
always has as much RAM as it could possible want/need?

--
John Bliss - http://www.linkedin.com/in/jbliss


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[hofar...@houseoffusion.com]

> Hi. So we're moving from ACF10 32 bit to ACF10 64 bit. On ACF10 32 bit, we
> settled on:
>
> Minimum JVM Heap Size (in MB) 1369
> Maximum JVM Heap Size (in MB) 1369
>
> On the ACF10 64 bit box, we have 32 GB of RAM to play with. Given that this
> box is just:
>
> ACF10
> The OS (Windows Server 2012)
> FusionReactor
>
> ...what's the best recommendation(s) for min/max heap to guarantee ACF10
> always has as much RAM as it could possible want/need?

This question requires more information. How much memory did your
application use in the 32-bit environment? Were you having
out-of-memory issues in the old enviroment?

Just because you have loads of memory doesn't mean you want CF to have
to manage it all, unless it's going to use it.

Dave Watts, CTO, Fig Leaf Software
1-202-527-9569
http://www.figleaf.com/
http://training.figleaf.com/

Fig Leaf Software is a Service-Disabled Veteran-Owned Small Business
(SDVOSB) on GSA Schedule, and provides the highest caliber vendor-
authorized instruction at our training centers, online, or onsite.

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[hofar...@houseoffusion.com]

In the last week, we maxed out at 960 MB.

Archive: http://www.houseoffusion.com/groups/cf-talk/message.cfm/messageid:360213

[hofar...@houseoffusion.com]

> > > Hi. So we're moving from ACF10 32 bit to ACF10 64 bit. On ACF10 32 bit,
> > > we settled on:
> > >
> > > Minimum JVM Heap Size (in MB) 1369
> > > Maximum JVM Heap Size (in MB) 1369
> > >
> > > On the ACF10 64 bit box, we have 32 GB of RAM to play with. Given that
> > > this box is just:
> > >
> > > ACF10
> > > The OS (Windows Server 2012)
> > > FusionReactor
> > >
> > > ...what's the best recommendation(s) for min/max heap to guarantee ACF10
> > > always has as much RAM as it could possible want/need?
> >
> > This question requires more information. How much memory did your
> > application use in the 32-bit environment? Were you having
> > out-of-memory issues in the old enviroment?
> >
> > Just because you have loads of memory doesn't mean you want CF to have
> > to manage it all, unless it's going to use it.
>

> In the last week, we maxed out at 960 MB.

OK, so maybe you'd leave the minimum heap size right around where it
is now, and increase the maximum by 1.5 or 2 times the current value -
these are just guesses, of course. See how that works, then change
accordingly.

If you're using Java 8 (which you can with the latest CF patches), you
might want to look at your PermGen settings, as Java 8 doesn't really
have a permanent generation any more.

Dave Watts, CTO, Fig Leaf Software
1-202-527-9569
http://www.figleaf.com/
http://training.figleaf.com/

Fig Leaf Software is a Service-Disabled Veteran-Owned Small Business
(SDVOSB) on GSA Schedule, and provides the highest caliber vendor-
authorized instruction at our training centers, online, or onsite.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|
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Archive: http://www.houseoffusion.com/groups/cf-talk/message.cfm/messageid:360214

[hofar...@houseoffusion.com]

In the "old days," the wisdom was to make min and max match so that CF
wasn't spending "horsepower" constantly re-sizing the heap. Is that no
longer true?

Archive: http://www.houseoffusion.com/groups/cf-talk/message.cfm/messageid:360215

[hofar...@houseoffusion.com]

> In the "old days," the wisdom was to make min and max match so that CF
> wasn't spending "horsepower" constantly re-sizing the heap. Is that no
> longer true?

It's never been true, in an unqualified sense. That's why they give
you two fields. Any place there's a choice in the CF Administrator,
it's there for a reason.

There is a cost to constantly increasing the heap size over time.
There is also a cost to starting with a large heap when you're not
currently using that much.

What's the right value for you? Only load testing can tell you for
sure. Anyone who tells you that they can give you the correct value
for a configuration field in all situations is wrong.

Dave Watts, CTO, Fig Leaf Software
1-202-527-9569
http://www.figleaf.com/
http://training.figleaf.com/

Fig Leaf Software is a Service-Disabled Veteran-Owned Small Business
(SDVOSB) on GSA Schedule, and provides the highest caliber vendor-
authorized instruction at our training centers, online, or onsite.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|
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Archive: http://www.houseoffusion.com/groups/cf-talk/message.cfm/messageid:360216