On Mar 28, 2008, at 1:11 PM, Ryan Stern wrote:
"On OS X, the client only has 128MB allocated to it."
Seriously?
Forgive me if this comes across as incredibly naïve, but didn't we
get away from fixed memory partitions when we moved from Mac OS 9 to
Mac OS X? Is "dynamic memory allocation" on a feature list
somewhere for a future version of Intermapper?
Ryan.
Java needs a contiguous heap due to the implementation of garbage
collection. We can control the maximum size of this heap when the
program is launched - this setting is used to reserve the memory. The
heap may grow and shrink and vary in size greatly over the life of the
application. The number that Janice quoted above is the default
maximum heap size that we set. Since we support Mac OS X 10.3.9, and
10.3.9 requires only 128MB of RAM, the Mac OS X application has a
maximum heap size of 128 MB. Setting this to a number larger than the
amount of physical RAM in the Mac will crash the VM. (This may have
been fixed by a later JVM in a later OS from Apple, I forget.) We
only have a single Mac OS X application for all versions of Mac OS X
(10.3.9-10.5.2), so this value has to be set to the lowest common
denominator - 128MB. 128MB is more than enough for most users.
If you want more technical information about how the Java heap work,
how it is allocated, and how that setting is used, ask me (or Google).
-Tex Clayton
Dartware, LLC
http://www.dartware.com
____________________________________________________________________
List archives:
http://www.mail-archive.com/intermapper-talk%40list.dartware.com/
To unsubscribe: send email to: [EMAIL PROTECTED]
