[erlang-questions] node.js vs erlang

[Darach Ennis]

Hi all,

For this to be comparable both Erlang and Node.js need to be running
similarly. I don't see how a concurrent Erlang runtime with multiple
schedulers
can be compared with a single-threaded Node.js implementation objectively or
fairly...

Using node cluster with the same number of cluster instances as erlang
schedulers might be a fairer environment for comparison. However, as
numeric computations are fairly efficient in Node.js and inefficient in
Erlang
relative to Java or C it may take a few iterations to get a fair comparison
in place. Node cluster is a standard part of node.js:

http://nodejs.org/api/cluster.html

There are various attempts at implementing fibers and lightweight threads
in Node.js (eg: https://github.com/laverdet/node-fibers/) but there is
nothing
common here. This would approximate an erlang runtime more closely at
the cost of deviating a little from a commonly found node runtime... Ho hum.

As javascript runtimes start to adopt vectorized instructions and other
optimisations their speed relative to a C baseline has and will continue to
steadily improve and has been for a number of years, especially with V8.

Good luck with the benchmarking!

Cheers,

Darach.


On Tue, Jun 17, 2014 at 12:48 PM, Joe Armstrong <erlang@REDACTED> wrote:

>
>
>
> On Tue, Jun 17, 2014 at 1:00 PM, Greg Young <gregoryyoung1@REDACTED>
> wrote:
>
>> Are you testing against single threaded node or one of the clustered
>> versions or multiple processes or?
>>
>>
>>
> Single threaded
>
> /Joe
>
>
>> On Tue, Jun 17, 2014 at 1:19 PM, Joe Armstrong <erlang@REDACTED> wrote:
>>
>>>
>>>
>>> On Tue, Jun 17, 2014 at 12:10 PM, Greg Young <gregoryyoung1@REDACTED>
>>> wrote:
>>>
>>>> Can you really compare the two? :)
>>>>
>>>
>>> Yes - there are many things we can measure. Performance, Latency, memory
>>> usage and so on.
>>>
>>> Right now I'm measuring latency -
>>>
>>> I set up a few thousand parallel processes which request fib(N) and
>>> measure the latency of the responses.
>>>
>>> the results will be published when I understand them :-)
>>>
>>> /Joe
>>>
>>>
>>>
>>>
>>>
>>>
>>>>
>>>>
>>>> On Mon, Jun 16, 2014 at 5:55 PM, Juan Facorro <juan.facorro@REDACTED>
>>>> wrote:
>>>>
>>>>> Hi Joe,
>>>>>
>>>>> There's a semicolon missing after the declaration of fib(), which for
>>>>> some reason, causes the stack overflow. After adding it the error went away.
>>>>>
>>>>> HTH,
>>>>>
>>>>> J
>>>>>
>>>>> On Monday, June 16, 2014 11:22:23 AM UTC-3, Joe Armstrong wrote:
>>>>>>
>>>>>> I'm trying to compare node.js with erlang. I'm a total node.js novice
>>>>>> BTW - but I've written some JS.
>>>>>>
>>>>>> Program 1 is just fibonacci - I want a web server to compute fib(N)
>>>>>>
>>>>>> So requesting http://127.0.0.1:8124/fib?n=2 should compute and
>>>>>> return fib(2)
>>>>>>
>>>>>> My node.js attempt crashes
>>>>>> Here's the code in fib.js
>>>>>>
>>>>>> --- fib.js
>>>>>>
>>>>>> var http = require('http');
>>>>>> var url  = require('url');
>>>>>>
>>>>>> function fib(n) {
>>>>>>   if (n < 2) {
>>>>>>     return 1;
>>>>>>   } else {
>>>>>>     return fib(n - 2) + fib(n - 1);
>>>>>>   }
>>>>>> }
>>>>>>
>>>>>> http.createServer(function (req, res) {
>>>>>>     var q = url.parse(req.url, true).query;
>>>>>>     var n = q.n;
>>>>>>     var result = fib(n);
>>>>>>     console.log('fib('+ n + ')= '+result);
>>>>>>     res.writeHead(200, {'Content-Type': 'text/plain'});
>>>>>>     res.end(result.toString());
>>>>>> }).listen(8124, "127.0.0.1");
>>>>>>
>>>>>> console.log('Server running at http://127.0.0.1:8124/');
>>>>>>
>>>>>> -- end
>>>>>>
>>>>>> -- now we run it
>>>>>>
>>>>>> $ node fib.js
>>>>>> Server running at http://127.0.0.1:8124/
>>>>>> fib(2)= 2
>>>>>>
>>>>>> /home/ejoearm/Dropbox/experiments/hello_world/fib.js:5
>>>>>> function fib(n) {
>>>>>>             ^
>>>>>> RangeError: Maximum call stack size exceeded
>>>>>>
>>>>>> fib(2) has run out of stack space????
>>>>>>
>>>>>> $ node --version
>>>>>> v0.8.21
>>>>>>
>>>>>> Any ideas what I'm doing wrong
>>>>>>
>>>>>> Cheers
>>>>>>
>>>>>> /Joe
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>  --
>>>>> Remember to send a copy to erlang (dot) questions (at) erlang (dot)
>>>>> org when posting.
>>>>> ---
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>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Studying for the Turing test
>>>>
>>>
>>>
>>
>>
>> --
>> Studying for the Turing test
>>
>
>
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