Clock gets stuck, sometimes

[hlolli]

Hi, thanks for this great library. I want to use the clock to reference schedules. I set Abletonlink.startUpdate to 10ms and on each function callback I send the timestamp from beat (of beat,phase and bpm that coma available as parameters). I printed to console an example of this (excuse the noise and ignore "offering:" part of the printout).

"offering: " 658.126638
"offering: " 658.147352
"offering: " 658.168396
"offering: " 658.189242
"offering: " 658.209964
"offering: " 658.230772
"offering: " 658.251438
"offering: " 658.272136
"offering: " 658.292854
"offering: " 658.313632
"offering: " 658.334332
"offering: " 658.355062
"offering: " 658.375954
"offering: " 658.396834
"offering: " 658.417746
"offering: " 658.440108
"offering: " 658.460968
"offering: " 658.48173
"offering: " 658.500564
"offering: " 658.521474
"offering: " 658.543846
"offering: " 658.562602
"offering: " 658.583232
"offering: " 658.604882
"offering: " 658.625718
"offering: " 658.648232
"offering: " 658.669106
"offering: " 658.689856
"offering: " 658.71058
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808
"offering: " 658.775808

this lasts for on avarage 30 secs, then it start counting normally again. I wonder if there's some concurrency issues with the clock and nodejs. Must add that I'm not doing anything special when this occours. No steps to reproduce but to just start console.logging the beat value from .startUpdate and wait until it clogs.

Im using
Node 7.0.0
abletonliink 0.0.3

[2bbb]

@hlolli
thanks for issue.

i tried to check on v6.9 with code:

const abletonlink = require('abletonlink');

const link = new abletonlink();

console.log("start\a");
let last = 0;
link.startUpdate(10, beat => {
    console.log(beat);
    if(last == beat) throw "WTF";
    last = beat;
});

but it doesn't happen.

now, i'm testing on v7.0. but maybe it will not happen...

do you use on Mac? or other? and OS version?
please tell me your env.

thanks.

[hlolli]

I got WTF with your code you provided, just from the node repl.

60.423198
60.44378
60.465106
60.485588
60.506462
60.52806
60.548614
60.569372
60.591674
60.61231
60.633042
60.654306
60.675272
60.697764
60.718366
60.73904
58.775808
58.775808
WTF
> 

I use Linux Fedora 25 (on rt-linux kernel).
Ususally Im making a clojurescript project as can be seen here https://github.com/hlolli/node-panaeolus/ seemingly that's not a factor here. I'd be curious to see what happens on node7.0 for you. Thanks for looking into this!

ADDED:
Found the value of the floats suspicius (ending with .775808), so I tried the third time.

118.290052
118.312706
118.337298
118.3628
118.38692
118.409454
118.432044
118.454704
118.477288
118.500564
118.5241
118.54678
118.569456
118.775808
118.775808
WTF

Added last time

358.488546
358.512354
358.536208
358.560244
358.584238
358.60827
358.775808
358.775808
WTF
> 

No doubt this number is up to no good :)

[2bbb]

mmm...
on v7.0.0, it didn't happen...

but i got good news.
it is this package is moving on Linux! 👍
(but behavior is doubtful...)

i will try to test on linux.
maybe there is ubuntu machine at my company...
and i will pay attention to .775808 😉

thanks.

[2bbb]

@hlolli

i tested on docker/Fedora25 and docker/Ubuntu16.04 with Node7.0.0 while 2 hours.
it didin't happen on Ubuntu16.04.

but, Fedora25 got same situation with

1379.540556
1379.561542
1379.582414
1379.603904
1379.62518
1379.64751
1379.669972
1379.693238
1379.714658
1379.735916
1378.775808
1378.775808

oh, yeah, .775808 is appear!!

but i don't know what i need to do to fix it...

i will test raw abletonlink (i.e. without Node.js, only c++) on Fedora25.
if it will happen, then maybe it is cause on abletonlink or Fedora25.

best regards.

[hlolli]

ok, thanks a lot @2bbb for going the distance and set up a fedora docker, that's real!

I have short performance later this month, so I see I have the option of changing to Ubuntu or find the cause of this strange bug. Look forward to see what results you get with pure c++.

best regards.

[2bbb]

@hlolli

so, on previous test, gcc version is not same.

• Ubuntu 16.04 with gcc 4.9.4
• Fedora 25 with gcc 6.2.1

and now, i tested on docker/Ubuntu with near version gcc 6.2.0 (there isn't 6.2.1 on apt...).
but it didn't happen.

maybe, using Ubuntu is safety.
but maybe switching to Ubuntu is hard work... 😭

i wanna support you! i will test pure c++ 😄

[hlolli]

I want to switch to NixOS in the long run (but that is very diffucult linux), but for one performance I can borrow my some computer.

If you find out that pure c++ fails, then we can open a ticket on AbletonLink and see if they can find out what's going on. I can't understand why Fedora is causing this, maybe some c/c++ library that AbletonLink uses, that is on default installed on fedora, is causing this, don't know....

I would support you back in german beers :D but not sure how well they taste after traveling to Japan

[2bbb]

maybe ableton link use only pure C++11.
and dependencie are only simple C++ library, asio standalone and Catch.
they have no dependencies to other library.
and all source is include to this package and build when npm install.

so, this is difficult situation...

i love german beers! only one time, i went karlsruhe and i drunk tasty beer on reception of z.k.m. it is great!! 💯

[2bbb]

now testing pure c++ on Fedora25...

i upload build script and cpp file.

https://gist.github.com/2bbb/38dcb04f99aef24a241276293f89924e/

download to directory includes node_modules/abletonlink and exec build.sh.
then we got link.o, and run ./link.o

[2bbb]

on Fedora, pure C++ program didn't get stack.
and i test on node.js with 20ms interval, then it didn't get stack.

maybe, it is causes on my source code or Node.js on Fedora...

mmm...

[hlolli]

I will have to try this when I get back home late tonigh, but at my work computer (also Fedora25) I tried the c++ code you wrote, it didn't fail, but there's some difference in how the floats are rounded. Also the nodejs hasn't failed to far (I have it running here). I keep updated.

[2bbb]

@hlolli

there's some difference in how the floats are rounded
exactly! but in my C++ code, every data keep with double, and maybe basically, node's Number is double. (sometime, it isn't double, like ByteArray and etc..,)

but, console.log(beat.toPrecision(21)); say similar result as C++.

[hlolli]

Hmm ok.., so it's not that. I'm tempted to close this as non-resolveable. I wasn't able to get WTF showing up at my work computer and its Fedora25. I try the C++ code at home and 20ms interval if that makes any change. Let you know tonight (guessing it will be nighttime in Japan).

[hlolli]

On the left side is the c++ code running forever and on the right nodejs having complications. This isn't anything new, maybe we can close this. For my part, I'm going to install new linux distro, Im also having other complications with Fedora, and I don't think its going to be too diffucult to change. Yet again, thanks for looking into this.

[2bbb]

@hlolli

thanks for testing on your env.

and i'm sorry for i was unable to be of any assistance.

i wanna resolve this problem in the future and i will keep to try.

thanks!