Re: JFW 9 Beta Memory Issues
- From: "Rick Harmon" <rharmon@xxxxxxxxxxxxxxxxxxx>
- To: <jfw@xxxxxxxxxxxxx>
- Date: Sun, 7 Oct 2007 17:27:24 -0400
Hi I have seen fluctuations on JFW memory useage here as well. I've seen JFW
using anywhere from 25 megs to 45 megs of memory and the size does tend to
increase as the application is running in memory but version 9 seems to be much
less of a memory leaker than previous versions. Running Jaws 9 here on both XP
and Vista.
Rick
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----- Original Message -----
From: Brian Hansen
To: jfw@xxxxxxxxxxxxx
Sent: Sunday, October 07, 2007 12:04 AM
Subject: Re: JFW 9 Beta Memory Issues
HMMM! Now that's really strange. Maybe it's time to start listing out our
hardware, and what flavor of XP we're using.
Win XP Home SP2
2GB of memory my system is setup to not have a swap file on the primary HD.
Pentium 3.4GHz. Dual Core processor
Asus motherboard with the Intel 975X chipset
NVidia GForce 6600GT video card with 128MB of memory
2 SATA HD's
Maybe this can start shedding some light on things.
Blessings,
Brian
----- Original Message -----
From: Agent86b
To: jfw@xxxxxxxxxxxxx
Sent: Saturday, October 06, 2007 6:53 PM
Subject: Re: JFW 9 Beta Memory Issues
Brian,
I am using Win XP and do not see this problem either. However I will keep
checking from time to time.
Max.
on 09:47 7/10/2007, Brian Hansen said:
Not too techie at all. I wonder if since you're using Vista at this
point, if it isn't a XP issue since you're not seeing the growth changing.
Blessings,
Brian
----- Original Message ----- From: "Joseph Lee"
<joseph.lee22590@xxxxxxxxx>
To: <jfw@xxxxxxxxxxxxx>
Sent: Friday, October 05, 2007 11:05 PM
Subject: re: JFW 9 Beta Memory Issues
Hi Brian,
This kind of thing is called memory leak--a condition where the
application executable fails to release memory that it no longer needs. From my
testing, it seems that it does not occur to me. The process of obtaining and
releasing memory is normal behavior for applications. This is because of the
following two reasons:
a. If an application is composed of threads--a small application
code--of execution (known simply as thread), then it is natural for the process
to use more memory than expected. More threads within the executable
translates to more memory usage. Contrary to people's belief, JAWS is composed
not only of just one thread, but multiple threads as well. The jfw executable
consists of JAWS tracking engine which gathers information on the screen,
synthesizer controller that relays information gathered from tracking engine
and sends it to speech synthesizer such as Eloquence, and braille display unit
which relays information on the screen and translates to braille characters
(this works properly when a braille display such as PAC Mate Portable is
attached). JAWS also includes Virtual Buffer which is activated when
applications that require virtual cursor is running, such as Internet Explorer
and Anobe Reader. The application you run, the more tracking routine is
needed, consequently leading to more memory usage. And once the thread is no
longer needed, jfw releases memory associated with the thread.
b. If an application needs to access cevices and software modules such
as USB devices and drivers, it needs more memory to load device drivers and/or
software modules. In order for JAWS to run properly, it requires Mirror
Display Driver. The initial memory usage of jfw, coupled with device driver
for Mirror driver results in more memory usage than expected.
Hope it was not that "too techie" for you. If you want simpler
explanations, let me know.
Cheers,
Joseph P.S.Tested using Windows Vista and JAWS 9.0.353.
----- Original Message -----
From: "Brian Hansen" <bc.hansen23@xxxxxxxxx
To: <jfw@xxxxxxxxxxxxx
Date sent: Sat, 6 Oct 2007 16:20:06 -0500
Subject: JFW 9 Beta Memory Issues
Please forgive me if this has been recently
discussed, but I just now got back on the list.
Have any of you noticed that even when the
screen isn't changing, JFW 9 Beta is continuing to grow in memory? If
you go into the "Task Manager" using CTRL-ALT-DEL, and go to the "Services"
tab, hit the letter "j" until you get to JFW, you'll get the amount of memory
JFW is currently using. Now if you hit F5 to refresh your screen you'll find
that the amount of memory is continuing to grow. The amount that it increases
seems to be relevant to the amount of time you let pass before hitting the
Refresh command. If nothing but the memory usage is changing on the screen,
why is it growing in such chunks, and why is the amount of time one waits
effecting the size of the memory growth?
Blessings,
Brian
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