[erlang-questions] node.js vs erlang

Tue Jun 17 14:40:22 CEST 2014

That's a good point Darach. Just to add to to that, it would be even nice
if the bench marking is performed for 2 cases: CPU intensive & IO intensive
code.
Would love to see Joe's comparison!

Cheers!

On Tue, Jun 17, 2014 at 5:35 PM, Darach Ennis <darach@REDACTED> wrote:

> 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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