Nearly every PDA with that much RAM doesn't actually have that much
RAM... the problem is, WinCE itself uses up a lot of it. For instance,
I sit here with my Dell Axim x51v with 64Mb, yet I have 29Mb available,
and I have nothing installed at the moment, just had to do a hard
restart last night. That's why most of the JREs out there are trimmed
down. There may be some exception to that, but I am not aware of it.
Your right, there are some with 128Mb these days, and it's possible to
hardware-hack them up to 256Mb I believe, but you can't count on having
all of it available. A big chunk of it is going to be taken up.
Also note that at least with the Windows Mobile 5 devices, there is a
difference between RAM and Flash ROM. PPC's used to have one big chunk
of memory that would be dynamically allocated between "program memory"
(RAM for all practical purposes) and "storage memory". Now though,
there really is two physically different things. For instance, My Axim
has 256Mb Flash ROM, probably about 210Mb or so of it starts out free.
You can think of this as a hard drive for the most part, it's yours to
store stuff in (and the OS to a limited degree I believe). There tends
to be enough storage space on modern PPCs to do Java and Tomcat and your
app, its the RAM where I think you'll run into a problem with.
I don't know off hand how much memory Tomcat itself needs, but I'd be
willing to bet 29Mb would be kind of tight, and that's not counting the
JRE or your app.
I definitely think you may want to consider not doing a webapp here,
unless the PDAs will always have net connectivity, then you could just
write a true webapp tailored somewhat to a PDA.
The good news is that PPC programming these days isn't too big a deal...
C# is enough like Java that you can probably get by with it. If you do
.Net, it won't be too much different than programming for Java.
That of course means your app won't be cross-platform, no Zaurus for
example. Dunno if you can get away with that or not.
Frank
Tom Miller wrote:
I don't know what's your use case,
I need a servlet engine.
Well, what do you intend to do with it ? Keep in mind it's
going to
use most of the device memory, and will be relatively slow.
I plan to write a small app to process a delivery process.
The app will process the delivery logic, capture digital
signature..etc.
The reason I want the servlet engine due to the fact that
I have been using a combination of tomcat, apache, mysql, jsp
and java on X86 flatform. Perhaps, there is a better way of
doing it I just don't know any better.
You have experience on this. What is your recommendation?
Some of later PDA have 128MRAM, will it be big enough to run
java?
Costin
but keep in mind tomcat ( and java
in general ) has a large memory footprint. If all you need
is an HTTP
server - it is better to use only the coyote connector (
with some
custom code ). Or even write your own tiny-http - you
really
don't
need support for large concurrency or all the fancy
features.
You may get better performances with CVM, which has much
smaller
footprint - but it may not work well with current tomcat.
Java on PDA is very tricky, make sure you have plenty of
memory (
i.e. 64M :-).
Costin
On 4/13/06, Tom Miller <[EMAIL PROTECTED]> wrote:
Costin,
Do you have a built version of tomcat and other
necessary
requirements information to run on a PDA? What PDA was
it?
Please share the information.
Thanks inadvance,
Tom
I tested it with jamvm+classpath on NSLU2, should run
fine
on zaurus as well.
Startup time is a bit slow, and memory use is a bit
high -
but it
works reasonably
well.
I would suggest the sandbox version for this :-).
The main problem on PDAs is the flash access speed,
which
is
much
smaller than HDD,
so size of the jar and number of classes loaded
matters a
lot.
Costin
On 4/13/06, Tom Miller <[EMAIL PROTECTED]> wrote:
Greetings,
Do we have a binary version of Tomcat build for PDA
(ipaq
or
sharp zaurus) arm processor? If not can some one
help?
Does anyone know where I can get a JDK for PDA?
Thanks,
Tom
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