Date: Wed, 22 Aug 2001 18:41:42 +0300
Ok, to summarize. I have in my IPaq total of 48 MB memory. (16 MB ROM + 32
MB RAM)
16 MB ROM (FLASH)
- mounted as "/"
contains
- kernel
- XWindows
- other applications
32 MB RAM
- Divided to two parts
PART 1 (16 MB)
- Main runtime memory for applications
PART 2 (about 16 MB)
- Mointer as "/mnt/ramfs"
- Secondary runtime memory for applications
- Secondary storage for applications (Files in here will be lost
in hard reset)
Is it now possible to change the size how PART1 and PART2 are divided? (If
I forexample would like to set Main runtime memory to 24 MB)
Mika
ps. I make small picture which represent the system.
(See attached file: Memory.png)
Michael Scott
Shappe To: Mika.Laitio_at_sysline.com
<mikey_at_hundred-acre cc: familiar_at_handhelds.org
-wood.com> Subject: Re: [Familiar] Memory usage and partitions?
22.08.2001 17:46
Please respond to
mikey
Mika,
> /dev/mtdblock/3 15360 13736 1624 90% /
> ramfs 15464 260 15204 2% /mnt/ramfs
>
> In addition, the "System Resource Tool" informes that the current
> memory usage is about 20 %.
>
> If I understand correctly, this mean that I have
>
> - 1.6 MB of memory for storage purposes
> - 15.2 MB of memory free for running applications
Not quite.
/dev/mtdblock/3 represents your Flash 'root'. As you surmise, you have
1.6MB
left, there. Assuming you're running Familiar 0.4, and using JFFS2, this is
still a bit misleading, since JFFS2 compresses. You might be able to fit
somewhat more than 1.6MB of uncompressed information into that space.
ramfs is not your application-running memory, but a RAM-disk that claims up
to half your available RAM. I believe that this is self-adjusting -- if you
haven't filled the space and your applications need more memory, the
RAM-disk will shrink. This RAM-disk is just as volatile, however, as the
rest of RAM -- if you actually reboot, or if your battery drains, this
'disk' is lost.
The memory usage being reported by the System Resource Tool the actual
application RAM, so on a 32MB iPAQ, if 20% is in use, you should have about
13MB of RAM free for applications.
> If I upgrade the memory from my IPaq to 64 MB, will I get more memory
for
> running my applications, or will I only get more storage space for them?
When people speak of upgrading memory, they usually mean RAM. An upgrade to
64MB will result in a ramfs that will take up to 32MB of RAM, and 32MB of
RAM actually available for your applications.
If you want more non-volatile storage, you will need to either obtain
either
a CompactFlash sleeve or a PCMCIA Card sleeve, and one of the many Compact
Flash or microdrive storage solutions. I believe there is a company that
will actually upgrade the in-built Flash, as well, but I think this voids
the warrantee.
Mikey
