On Thu, Mar 13, 2014 at 11:24 AM, Timothy Baldridge <tbaldri...@gmail.com>wrote:

> I talked to Martin after a CodeMesh, and had a wonderful discussion with
> him about performance from his side of the issue. From "his side" I mean
> super high performance.
>
[...]

Hi Tim,

Thanks for explaining  the context of Martin's work - I did not know that
it was so advanced. I did some research back in good times on
http://en.wikipedia.org/wiki/Connection_Machine (via telnet 56kb/s telnet
connection from east Europe to US - that was super cool back then) and can
only atest to what he says in the presentation. You can achieve amazing
levels of performance provided that patterns of data flow and control in
software match exactly parallel nature of given architecture.

However his point is somewhat more serious. He directly "attacks" a premise
that using immutable data is inherently mutli-core friendly which comes
from the deduction that writing reactive software reduces the use locks and
guards hence enables more flow and less waiting. Now his point is that GC
acts a super GIL which effectively kills all the hard work done on the
language and application design level.

Now, I wish Marin eats his own dog food and as pointed out numerous times
in the presentations, he backs up his points with a real experiments and
data. At least it was not apparent wether his conclusions were purely
theoretical or grounded in some experience.

I am in the process of transitioning from Scala to Clojure ecosystem (just
finished SICP videos and have some hard 4clojure problems behind me, but a
lot of to learn) so not yet fluent in all aspects of the language but I
think at some point I will try to write some simulations of STM performace
following some of Martin's intuitions. I think that it will be very cool.

Best,
Andy

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