<p dir="ltr">Yes, indeed; considering that the goal is reduction of memory use, however, what we want is to avoid intermediate representations which explode in size on binaries. I don't know anything about the from_core parser, but the string-as-list representation of a binary literal is in itself a factor 32/64 blowup. :-/<br>
(Btw: I was wrong about introductions to Core Erlang; threre is one. Writing on the phone has its fact-checking disadvantages...)</p>
<div class="gmail_quote">Den 29/09/2013 23.01 skrev "Tom Murphy" <<a href="mailto:amindfv@gmail.com">amindfv@gmail.com</a>>:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr"><div><div>There's also just:<br><br></div>erlc +to_core foo.erl<br></div>erlc +from_core foo.core<br><br>Tom Murphy<br></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Sun, Sep 29, 2013 at 11:59 AM, Loïc Hoguin <span dir="ltr"><<a href="mailto:essen@ninenines.eu" target="_blank">essen@ninenines.eu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>On 09/29/2013 08:24 PM, Ivan uemlianin wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
That's what I've just done :D Core Erlang looks very verbose but quite<br>
regular & probably not difficult to generate.<br>
<br>
My questions now are:<br>
- are there any libraries "out there" for generating Core Erlang, or do<br>
we all roll our own?<br>
</blockquote>
<br></div>
Look at the cerl module. It's just a matter of generating the proper structure using those functions.<div><br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
- how would one use compile:file or compile:forms with core erlang? I<br>
haven't been able to find any documentation (haven't read Richard<br>
Carlsson's Introduction paper yet).<br>
</blockquote>
<br></div>
Do read it. But to answer that question, compile:forms with from_core option.<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>
Many thanks<br>
<br>
Ivan<br>
<br>
--<br>
festina lente<br>
<br>
<br>
On 29 Sep 2013, at 18:36, Erik Søe Sørensen <<a href="mailto:eriksoe@gmail.com" target="_blank">eriksoe@gmail.com</a><br></div>
<mailto:<a href="mailto:eriksoe@gmail.com" target="_blank">eriksoe@gmail.com</a>>> wrote:<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>
Core Erlang is an intermediate representation in the Erlang compiler<br>
- but also (afaik) a fairly well-defined/public one and one that is<br>
stable.<br>
I don't think you'll find much in the vein of tutorials. Try getting<br>
erlc to output the intermediate format, though, for a small program<br>
similar to what you'll be using it for.<br>
<br>
Den 29/09/2013 19.20 skrev "Ivan uemlianin" <<a href="mailto:ivan@llaisdy.com" target="_blank">ivan@llaisdy.com</a><br></div>
<mailto:<a href="mailto:ivan@llaisdy.com" target="_blank">ivan@llaisdy.com</a>>>:<div><br>
<br>
Thanks! I think I'll try and head in that direction. I've had a<br>
few goes at other methods (db lookup etc) and they're much slower<br>
than this "dynamic hardcoding"). I'll sniff around for Core Erlang<br>
tutorials.<br>
<br>
Best wishes<br>
<br>
Ivan<br>
<br>
<br>
--<br>
festina lente<br>
<br>
<br>
On 29 Sep 2013, at 17:48, Erik Søe Sørensen <<a href="mailto:eriksoe@gmail.com" target="_blank">eriksoe@gmail.com</a><br></div>
<mailto:<a href="mailto:eriksoe@gmail.com" target="_blank">eriksoe@gmail.com</a>>> wrote:<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>
A thing which I discovered recently (in connection with<br>
mochiglobal) is that compiling code containing large binaries, or<br>
large amounts of binaries, is quite memory-intensive. As I<br>
recall it, the numbers were ~64 bytes of RAM per byte in a binary<br>
metal; twice as much if on a 64 bit emulator.<br>
Which means that if you want to compile modules containing (in<br>
sum) multimegabyte binaries, doing so from Erlang source or from<br>
full Erlang AST is a no-go. Iirc, it is feasible if starting<br>
from Core Erlang.<br>
/Erik<br>
<br>
Den 29/09/2013 12.50 skrev "Ivan Uemlianin" <<a href="mailto:ivan@llaisdy.com" target="_blank">ivan@llaisdy.com</a><br></div>
<mailto:<a href="mailto:ivan@llaisdy.com" target="_blank">ivan@llaisdy.com</a>>>:<div><div><br>
<br>
Dear Anthony<br>
<br>
Thanks for your comment.<br>
<br>
Yes, that's exactly what the generated module is doing. The<br>
generated module has a single function with many clauses like<br>
this:<br>
<br>
f(<<"trigger", Rest/binary) -> ...<br>
<br>
This is why (as far as I can work out) the generated code has<br>
to be so big.<br>
<br>
I prefer the idea of generating and loading code to, say,<br>
updating a database table, because it seems faster and less<br>
likely to lead to bottlenecks.<br>
<br>
Best wishes<br>
<br>
Ivan<br>
<br>
<br>
On 29/09/2013 11:38, Anthony Ramine wrote:<br>
<br>
Hello Ivan,<br>
<br>
Out of curiosity, what does it look like?<br>
<br>
Pattern matching on literal values in Erlang is done with<br>
a binary search over the sorted list of patterns, I am<br>
not sure this would play well with your use case even if<br>
the compilation didn't bring the VM down.<br>
<br>
Regards,<br>
<br>
Le 29 sept. 2013 à 11:29, Ivan Uemlianin a écrit :<br>
<br>
All goes well on small test files, but the files I<br>
want to use IRL are relatively large --- around<br>
120,000 lines.<br>
<br>
<br>
<br>
--<br></div></div>
==============================<u></u>__============================<u></u>==<div><br>
Ivan A. Uemlianin PhD<br>
Llaisdy<br>
Speech Technology Research and Development<br>
<br></div>
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