--- In Jason Stahls <> wrote:
>
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> On 12/02/10 09:15, Steve M wrote:
> > Thanks all for the input. As background, I have three processes running for
> > my application, two of which I ported from a Linux PC. There is a shell
> > script which wraps a gps client and filters the data I need. I have a C
> > program that does memory mapping and a Java program that does the primary
> > processing. The three process share data, though the shell script only
> > creates data needed by the other two. These processes are working as
> > desired. The only issue is the CPU spike.
> >
> > If time were not an issue, I could explore several of the options.
> > It's easy enough to set up a socket between the C and Java program. I've
> > also thought about calling the script from the Java program and getting
> > back the data I need.
> >
> > What I have not tried before is writing the files to RAM so I'm not sure
> > what is involved with that.
>
> How big are the files? If it's only a few KB then a RAM disk is
> probably the easiest to implement since it wouldn't require much for
> code changes (change the path your storing/reading the file from). I'm
> not sure tho if the default TS kernel images are compiled with RAM disk
> support tho.
>
Yes they are. it's very easy - add one line to /etc/fstab so it looks like
this:
$ cat /etc/fstab
proc /proc proc defaults 0 0
/dev/mtdblock/1 / jffs2 0 0
ramfs /tmp ramfs 0 0
Then /tmp is a ramdisk. Anything you write there will disappear after a reboot
but writing there is fast and doesn't wear out flash memory.
If you write too much stuff there you will start to run out of memory as show
by free.
Martin
> - --
> Jason Stahls
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