At 10:21 PM 3/7/00 -0500, "Todd L. Miller" <[EMAIL PROTECTED]> wrote:
>> No, no.... I've tried to boot JOS on 8MB RAM machine. It does not work!!!
What about 16MB?
If we had a virtual memory manager and swap file/partition, wouldn't JOS
require less real RAM? We need to get that virtual memory manager working.
> If someone felt like cutting down Sun's library, it might. The
>major barrier to an 8 MB machine is that Sun's class library alone weighs
>in at about 7.6 MB, IIRC. The rest of JJOS should fit in that 8 MB w/o
>too much difficulty (e.g. turn off debug info) but that doesn't leave any
>room for a heap or a stack :)
This is one of the very good reasons for pursuing (1) Kore and (2) package
files.
We could use Kore on a machine that has only 8MB. Kore fits in a "tiny" zip
file. While it only implements the Java 0 Platform from JDK 1.02, it has
all of the Java essentials. In fact, I'm using Kore without the AWT. Why
should I carry the AWT along on an embedded machine that doesn't have a
monitor? That is a waste of RAM on a machine that has little RAM to spare.
We could use package files on a machine that has only 8MB. Package files
are a very good replacement for rt.jar or classes.zip. Each java.* package
has its own package file. Package files are implemented in different ways.
They can be implemented as .zip files, too. If put only one package in a
zip file and call it by the name of the package, you have a package file.
Here is my most recent design for bootstrapping JOS without a large
monolythic classes.zip archive:
core.zip:
java.io
java.lang
java.net
java.util
java.applet.zip:
java.applet
java.awt.zip:
java.awt
java.awt.image.zip:
java.awt.image
java.awt.peer.zip:
java.awt.peer
java.sql.zip:
java.sql
javax.servlet.zip:
javax.servlet
javax.servlet.http.zip:
javax.servlet.http
javax.comm.zip:
javax.comm
javax.swing.zip:
javax.swing
Because java.io is inside core.zip, extra packages can be loaded as needed
from the I/O subsystem. Because java.net is inside core.zip, extra packages
can be downloaded from across the network from a HTTP service.
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