[erlang-questions] About Erlang system performance

[Max Lapshin]

What exactly gives performance problems, when calling from HiPE to beam and
back?
Marshalling arguments?

But NIF doesn't require marshalling data. Maybe it is possible to achieve
something like in LLVM, when function is transparently compiled from
bytecode to some native.

Maybe there were some discussions on this mailing list about it?


On Fri, Nov 9, 2012 at 11:06 PM, Fred Hebert <mononcqc@REDACTED> wrote:

>  We've used HiPE in parts of our system that required tight fast loops.
> Whenever we need something to go fast due to some algorithmic complexity,
> *and* that we can manage to isolate it as a single unit that doesn't need
> to call to non-HiPE code, we will try to convert it.
>
> Basically, I've been told that HiPE and Beam have some overhead when it
> comes to switching from one to the other. When we have a bit of code that
> is a hotspot, I'll try to inline whatever calls are made to other modules
> (mostly lists), compile only that module with HiPE, and let it do its
> thing. Sometimes benchmarks go in HiPE's favour, sometimes not.
>
> In a particular instance of our stack, it gave us nearly 2x speedup on
> loop & search operations that frequently happen more than 50,000 times per
> second. Definitely worth it, and it's been running in production for
> months, just for that single module.
>
>
> On 12-11-09 8:45 AM, Valentin Micic wrote:
>
> Interestingly enough, this was a kind of conclusion we've arrived at as
> well -- the good performance of Beam, combined with "perceived
> instability", acted as a serious deterrent for me.
> But Max, wouldn't you like to know if there are any brave souls out there
> that were prepared to go beyond perceptions and successfully tried it in
> "real-life" situation?
>
>  V/
>
>
>  On 09 Nov 2012, at 3:34 PM, Max Bourinov wrote:
>
> Unrelated, but: we were considering to give a try to HiPE but so far there
> is no need to do it for us because Beam outperforms everything else in our
> problem domain.
>
>
> Best regards,
> Max
>
>
>
>
> On Fri, Nov 9, 2012 at 5:16 PM, Valentin Micic <valentin@REDACTED>wrote:
>
>> Unrelated, but would be interesting to find out -- are there any
>> commercial-grade (let alone carrier-grade) systems that take advantage of
>> HiPE?
>>
>>
>> V/
>>
>> On 09 Nov 2012, at 2:11 PM, Schneider wrote:
>>
>> > you're right. HIPE generates compiled code.
>> > my mistake.
>> > take a look here for more info's about HIPE:
>> > http://user.it.uu.se/~kostis/Papers/erlang03.pdf
>> >
>> > greatz Johannes
>> >
>> >
>> > On Fr 09 Nov 2012 13:07:49 CET, Matti Oinas wrote:
>> >> Correct me if I'm wrong but doesn't HIPE compile to native code?
>> >>
>> >> --
>> >> Matti
>> >>
>> >> On Fri, Nov 9, 2012 at 1:57 PM, Schneider <js@REDACTED> wrote:
>> >>> Erlang is a language, which produced byte-code which get' interpreted
>> by the
>> >>> Erlang engine. C++ instead generates mashing-code which has on the
>> one hand
>> >>> a much better performance, on the other hand,
>> >>> some disadvantages like incompatibility between different OSs.
>> >>>
>> >>> greatz Johannes
>> >>>
>> >>>
>> >>> On Fr 09 Nov 2012 09:42:21 CET, hume npx wrote:
>> >>>>
>> >>>> Hi, all:
>> >>>>   I'am new to erlang, after investigate some benchmark such as at
>> >>>>
>> http://shootout.alioth.debian.org/u64q/which-programs-are-fastest.php,
>> >>>> I found that erlang compiler is not so good at speed? the benchmark
>> >>>> shows that erlang Hipe is 13x slowdown compared to C++, as compared
>> to
>> >>>> Haskell GHC (3.3x slowdown), go 2.98x slowdown or even javascript v8
>> >>>> is about 1x faster than erlang, I investigated the erLLVM project
>> >>>> which reported similar results to Hipe, you know performance is so
>> >>>> important nowadays, what caused the hard to improve performace of
>> >>>> erlang or just there are not people working on it? Erlang is
>> >>>> attractive to me after several days studying, but with great
>> >>>> performance will be more attractive and competitive to some languages
>> >>>> such as go etc.
>> >>>>
>> >>>>
>> >>>> _______________________________________________
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>> >>>
>> >>>
>> >>>
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