Fixed the subject to be more accurate.
On 10/07/2018 11:31 AM, Eirik Bakke wrote:
TL;DR: I would increase Xmx to 50% of system memory by default.
Right now NetBeans calculates it's default heap size on 20% of the system
memory, but cap it on 1Gb.
It's worse than that--this is the _maximum_ heap size, not the default (at
least on MacOS on Linux).
I ran on the default for years, but eventually started setting a much higher
limit in netbeans.conf. This improved NetBeans performance greatly, and got rid
of some very annoying errors where some NetBeans-invoked maven process would
run out of memory.
I'd say put the maximum at 50% of system memory. The JVM won't actually use
that much unless it needs it. And even if it uses it all, it can still be
swapped out by the OS if other processes needs it. Swapping is probably better
than constantly running the garbage collector to reclaim space (though Java
performance tuning experts might chime in on this latter theory).
Photoshop, for comparison, uses up to 70% of system memory by default (a setting in
Preferences->Performance->Memory Usage). I frequently run both Photoshop and
NetBeans concurrently and have no issues, even though both are configured to use up
to 70% and 50% of system memory, respectively. (This was the case both on my old
MacBook Air with 8GB RAM and on my newer Lenovo Windows 10 machine with 16GB RAM.)
-- Eirik
-----Original Message-----
From: Laszlo Kishalmi <[email protected]>
Sent: Saturday, October 6, 2018 6:51 PM
To: [email protected]
Subject: NetBeand Default HeapSize
Hi there,
Right now NetBeans calculates it's default heap size on 20% of the system
memory, but cap it on 1Gb.
Is it usually enough? Most of my machines have 16Gb ram and one of the first
things I do is to set the heap limit to 2Gb or more. I thing the
20 % is good, but we might move the cap to 2,3 or 4 Gb, so we do not need to
meddle with netbeans.conf.
What's your Opinion?
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