My thought processes are not always good enough. It would be "cool" is not
a reason to a mathematician. It is a good reason to a programmer. I am a
programmer.
So, I am sorry. I surrender. I really have homework I am not doing and I
should be. I have to stop this thread somehow. I have to get to work on
the midterm, which is take home and this emailing back and forth is taking
all my time. I have to work on the midterm problems. They have nothing to
do with matrices by the way, or parallel programs. So I will have to attend
to that now. Maybe after I am done I can come back to this. Not now.
Rich
-----Original Message-----
From: Richard Hennessy
Sent: Saturday, June 09, 2012 12:54 PM
To: Alexander Klimov ; Dmitry Shkirmanov
Cc: maxima at math.utexas.edu
Subject: Re: [Maxima] parallel cell executing and wxmaxima
The Maxima programming language should also be updated to give
users/programmers control over the creation of thread.
1. Should be able to halt a running process.
2. Should have the ability to turn off/turn on parallel code.
3. Should have enhanced programming language features.
a. Should have ability to specify that a resource is sequential access
or not.
b. Should have ability to launch parallel threads.
c. Should have ability to wait for a thread to complete.
d. Should have ability to halt a running child thread within code.
e. Should be able to communicate between threads (maybe).
f. Other stuff I have not "thought of" while writing this email.
Rich
-----Original Message-----
From: Richard Hennessy
Sent: Saturday, June 09, 2012 12:30 PM
To: Alexander Klimov ; Dmitry Shkirmanov
Cc: maxima at math.utexas.edu
Subject: Re: [Maxima] parallel cell executing and wxmaxima
I think this works out if the user is able to halt a running multi-threaded
process too. In case of deadlock or race conditions being caused by the
parallel code.
-----Original Message-----
From: Richard Hennessy
Sent: Saturday, June 09, 2012 12:27 PM
To: Alexander Klimov ; Dmitry Shkirmanov
Cc: maxima at math.utexas.edu
Subject: Re: [Maxima] parallel cell executing and wxmaxima
Hi:
Along a similar line of reasoning. Could we make matrix multiplication in
Maxima multi-threaded? This could produce a speed up of up to a factor of 8
on a i7 Intel processor. If the matrix is a matrix of functions then let the
user worry about side effects of individual threads in multi-treading. That
is not Maxima's problem, it is the users. I think as long as the user has
the ability to turn off or turn on parallelization of code then there is no
problem.
Rich
-----Original Message-----
From: Alexander Klimov
Sent: Saturday, June 09, 2012 9:51 AM
To: Dmitry Shkirmanov
Cc: maxima at math.utexas.edu
Subject: Re: [Maxima] parallel cell executing and wxmaxima
On Sat, 9 Jun 2012, Dmitry Shkirmanov wrote:
> But sometimes it is useful to run cells simultaneously ,for example in
> case of
> dual-core processor.
>
> So, is it possible to make wxmaxima to perform, for example, this:
> 1) Start the first cell calculation and the second cell calculation
> simultaneously.
> 2)After finishing the first cell calculation and the second cell
> calculation
> to execute the third cell?
The cell independence check is far from trivial: if one cell is
f(3), where f assigns 3 -> a, and the second cell is g(5), which is
supposed to return a+5, then it would be a mistake to calculate the
second cell not after the first one.
--
Regards,
ASK
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