Hi,,
Thanks for a simpler explanation of VM running out. If you give
me permission, I'll post your explanation on the PBWORKS page
(good thing that I put a VM article as a place holder). Again,
thanks for your efforts (I'll regard you as one of the
experts...).
Cheers,
Joseph
----- Original Message -----
From: stephen <[email protected]
To: peter greco <[email protected]>,
[email protected],[email protected],
[email protected]
Date sent: Thu, 24 Sep 2009 12:49:30 +0100
Subject: Re: [Braillenote] virtual memory?
Hi,
Almost all computing systems use virtual memory: note takers,
palmtops, netbooks, notebooks, laptops, pcs, ...
There are at least four things that tend towards running out of
virtual memory, there may be more.
When a system has run out of vm, the only way out really is to
reset/reboot.
Those four things:-
1. If the system has little vm to start with then it will always
struggle, particularly when trying a number of opperations
concurrently or when one application has a lot to do, (see 4
below).
This I'm sure would need at least a change from CE 4.2 to help
the BN.
2. If the underlying vm management system, (for the BN that's CE
4.2 and perhaps a bit of KeySoft), then vm can be used up quicker
than it should be.
This vm management has to: satisfy requests for memory from
applications; keep track of who has what memory and where;
efficiently recycle memory handed back by applications.
If this management is not done well then parts of the vm that
should be available are not.
If for example an application gives back memory but the
management does not reclaim it properly, it might not be
available for another program when it should be.
This management is not at all a simple task.
3. If applications do not handle memory well.
Example, if they hang on to memory that they should not then the
vm management hasn't got a chance.
This also is not entirely straightforward because if you don't
know how much memory you will need, do you ask for it in little
chunks as you need it or ask for loads assuming you might require
so much.
4. When applications are asked to perform a task which is beyond
them or the system on which they run.
An example of this might be KeyWeb trying to process a vast web
page.
No matter how well KeyWeb is written, an enormous or very complex
page will always require a large amount of memory.
I have known some cases on other computing systems where an
application was so low on remaining vm that it could not even get
enough to give the message, "out of vm".
If this were to happen on the BN, because of the way that KeySoft
is written, I think it brings the whole system down.
Regards,
Steve.
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"He that believeth on him is not condemned: but he that believeth
not is condemned already, because he hath not believed in the
name of the only begotten Son of God.
And this is the condemnation, that light is come into the world,
and men loved darkness rather than light, because their deeds
were evil."
(John 3:18-19 AV)
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----- Original Message -----
From: peter greco <[email protected]
To: "Alex Hall" <[email protected]>,
[email protected],[email protected],
[email protected]
Date sent: Sat, 19 Sep 2009 10:02:27 +0930
Subject: Re: [Braillenote] virtual memory?
Hi Alex.
Thanks for this!
So, with other "products", they never run out of virtual memory?
Or do they?
Also, at the risk of sounding mystical, where does the virtual
memory go? Does it mount up say on other note takers or
conventional computers to a stage where they too need to be
reset?
Would a concerted campaign by BN users to get the c e upgrade
have any effect on HW??
Best!
Peter.
----- Original Message -----
From: "Alex Hall" <[email protected]
To: "peter greco" <[email protected]>,"Jahmal Lovato"
<[email protected]>,<[email protected]
Date sent: Fri, 18 Sep 2009 07:29:14 -0400
Subject: Re: [Braillenote] virtual memory?
Windows CE 4.2 is the cause of the bad memory usage on the bn,
plus there is
little memory to begin with, especially when you are talking web
browsing.
If a site has a lot of images and fancy links it will probably
take up more
space, but there is really no way to tell. This is why
skweezer.com is so
nice.
Have a great day,
Alex
New email address: [email protected]
----- Original Message -----
From: "peter greco" <[email protected]
To: "Jahmal Lovato" <[email protected]>;
<[email protected]
Sent: Friday, September 18, 2009 6:22 AM
Subject: [Braillenote] virtual memory?
Why do some other note takers and conventional computers not run
out of
virtual memory?
Why do some sites use up so much more virtual memory than
others?
Is there a way of knowing which sites use alot, apart from
trying them and
having your BN tell you the message?
Peter.
----- Original Message -----
From: Jahmal Lovato <[email protected]
To: [email protected]
Date sent: Fri, 18 Sep 2009 16:38:01 +1200
Subject: [Braillenote] Ethernet port?
Hi all, especially HW,
Is there a way, if you ever do a hard ware update to add an
ethernet port?
Jahmal
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