I was thinking of bumping to 1GB.
A 32-bit JVM can't go higher than a 4GB process space, and typically
you don't go above 2GB heap there in case there's a lot of native
memory that might push it close to the 32-bit process limit. So I
think we'd be safest halving that and doing 1GB, which would be enough
for the vast majority of uses, but not so large it would commonly
exceed available memory on a typical desktop or server.
FWIW, my reason for increasing it may be invalid now...I didn't like
that installing the TorqueBox 2.0 gems required bumping up -Xmx, but
it turns out there's an ugly workaround in RubyGems to blame. A tiny
patch by nahi and torquebox-server installs fine without the memory
bump. So I'm back on the fence about increasing it, but I think
perhaps it's not unreasonable.
For a historical perspective...we bumped it to 500MB in May of 2008
(5b0dec8) and at the time it seemed like a lot. These days, everyone
has several GB on their desktops and double-digit GB on their servers,
so perhaps it's a reasonable time to bump it up.
commit 5b0dec89fd1c3abb9d6a0d9e57f5060703f05d73
Author: Charles Oliver Nutter <head...@headius.com>
Date: Sat May 24 09:14:03 2008 +0000
Fix for JRUBY-1582, allow setting JAVA_MEM and JAVA_STACK as env
vars. Also bumped max mem up to 500MB since some 64-bit systems are
showing higher memory use for big gem installs.
Incidentally...we might have been able to avoid this bump even then,
since as noted in the commit it was *also* intended to work around
RubyGems bloat.
- Charlie
On Mon, Dec 19, 2011 at 10:03 PM, Rob Heittman
<rob.heitt...@solertium.com> wrote:
> I love the idea of an increase. What did you have in mind for a new value?
> I've rewritten this email a dozen times now trying to suggest a good default
> and can't convince myself of any ideal value. All my actual JRuby apps use
> many-many GB of heap, which is why they're JRuby apps ... and I don't feel
> too bad about having to set those limits myself in accordance with the
> capacity of the system ... so I have no sound proposal.
>
> On Mon, Dec 19, 2011 at 10:34 PM, anildigi...@gmail.com
> <anildigi...@gmail.com> wrote:
>>
>> Yeah,
>>
>> I think bumping up default -Xmx would be good. Almost every Rails app I
>> have worked needed to bump up the default -Xmx manually. Please make it
>> happen :D
>>
>> --
>> Best,
>> Anil
>>
>>
>> On Tue, Dec 20, 2011 at 5:16 AM, Charles Oliver Nutter
>> <head...@headius.com> wrote:
>>>
>>> I have been wondering if we shouldn't just bump up the default -Xmx
>>> max heap size we allow in the JRuby executable. I know the JVM has a
>>> tendency to want to grow the heap, but few things are as frustrating
>>> as having some long-running process hit the heap max and die.
>>>
>>> Thoughts? Concerns?
>>>
>>> - Charlie
>>>
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>>
>>
>>
>>
>
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