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How NodeJs resolve continuous operations?

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There are Event Loop that accepts callbacks and executes them, when need. And If I understand this is one thread event loop, so there is one callback that it executes at a time. I write test

setInterval(() => console.log('INTERVAL'), 801);
setInterval(() => while(true) , 800);

There is the first setinterval() that arrives at event loop firstly. Second setinterval() (with infinite cycle) arrives secondly. So one thread executes while(true), and it cannot execute console.log('INTERVAL').

Is it means, if I F.E. will write server on NodeJs, that on one endpoint execute continuous calculations, and if one client sends the request, other clients should wait, until the server has served these long calculations and then will serve other clients?

P.S. in c# TPL, we use Tasks, and CLR thread pull creates two threads, and both of Console.WriteLine("Interval") and 'while true' executes parallel.

javascript node.js

share|improve this question

edited Mar 29 at 8:59

Muath

2,7341010 gold badges3232 silver badges5959 bronze badges

asked Mar 28 at 21:09

AndriyAndriy

1333 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  each 801 milliseconds the console will display 'INTERVAL' example jsfiddle.net/t016czrL
  
  – Muath
  Mar 28 at 21:19
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Muath but if setInterval with the infinite loop will be first in the event loop, so that alert will never display: jsfiddle.net/4vmcwrqg
  
  – Andriy
  Mar 28 at 21:44
  

  
  
  
  

add a comment
 | 

0

There are Event Loop that accepts callbacks and executes them, when need. And If I understand this is one thread event loop, so there is one callback that it executes at a time. I write test

setInterval(() => console.log('INTERVAL'), 801);
setInterval(() => while(true) , 800);

There is the first setinterval() that arrives at event loop firstly. Second setinterval() (with infinite cycle) arrives secondly. So one thread executes while(true), and it cannot execute console.log('INTERVAL').

Is it means, if I F.E. will write server on NodeJs, that on one endpoint execute continuous calculations, and if one client sends the request, other clients should wait, until the server has served these long calculations and then will serve other clients?

P.S. in c# TPL, we use Tasks, and CLR thread pull creates two threads, and both of Console.WriteLine("Interval") and 'while true' executes parallel.

javascript node.js

share|improve this question

edited Mar 29 at 8:59

Muath

2,7341010 gold badges3232 silver badges5959 bronze badges

asked Mar 28 at 21:09

AndriyAndriy

1333 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  each 801 milliseconds the console will display 'INTERVAL' example jsfiddle.net/t016czrL
  
  – Muath
  Mar 28 at 21:19
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Muath but if setInterval with the infinite loop will be first in the event loop, so that alert will never display: jsfiddle.net/4vmcwrqg
  
  – Andriy
  Mar 28 at 21:44
  

  
  
  
  

add a comment
 | 

There are Event Loop that accepts callbacks and executes them, when need. And If I understand this is one thread event loop, so there is one callback that it executes at a time. I write test

setInterval(() => console.log('INTERVAL'), 801);
setInterval(() => while(true) , 800);

There is the first setinterval() that arrives at event loop firstly. Second setinterval() (with infinite cycle) arrives secondly. So one thread executes while(true), and it cannot execute console.log('INTERVAL').

Is it means, if I F.E. will write server on NodeJs, that on one endpoint execute continuous calculations, and if one client sends the request, other clients should wait, until the server has served these long calculations and then will serve other clients?

P.S. in c# TPL, we use Tasks, and CLR thread pull creates two threads, and both of Console.WriteLine("Interval") and 'while true' executes parallel.

javascript node.js

share|improve this question

edited Mar 29 at 8:59

Muath

2,7341010 gold badges3232 silver badges5959 bronze badges

asked Mar 28 at 21:09

AndriyAndriy

1333 bronze badges

setInterval(() => console.log('INTERVAL'), 801);
setInterval(() => while(true) , 800);

share|improve this question

edited Mar 29 at 8:59

Muath

2,7341010 gold badges3232 silver badges5959 bronze badges

asked Mar 28 at 21:09

AndriyAndriy

1333 bronze badges

share|improve this question

edited Mar 29 at 8:59

Muath

2,7341010 gold badges3232 silver badges5959 bronze badges

asked Mar 28 at 21:09

AndriyAndriy

1333 bronze badges

edited Mar 29 at 8:59

Muath

2,7341010 gold badges3232 silver badges5959 bronze badges

edited Mar 29 at 8:59

Muath

2,7341010 gold badges3232 silver badges5959 bronze badges

asked Mar 28 at 21:09

AndriyAndriy

1333 bronze badges

asked Mar 28 at 21:09

AndriyAndriy

1333 bronze badges

2 Answers
2

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0

yes, server hangs if one endpoint is performing complex computations and if other endpoint requests, it must wait. Node has only one event loop and limited number of worker threads

You should not block the event loop. you should not perform the complex computations in node js synchronously or asynchronously.

Please refer this for more information:
https://nodejs.org/en/docs/guides/dont-block-the-event-loop/

share|improve this answer

answered Mar 29 at 7:50

Shekar ManiaShekar Mania

7933 bronze badges

add a comment
 | 

0

Don't use while(true)

Use this instead:

setInterval(() => console.log('INTERVAL1'), 801);
// change 1000ms with time you need
setInterval(() => setInterval(() => console.log('INTERVAL2'), 1000) , 800);

share|improve this answer

answered Mar 28 at 22:15

MuathMuath

2,7341010 gold badges3232 silver badges5959 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It's not a question about what to use, it is a question about what occurs if one client on my Node Js server sends the request that will be processed too long. Will other clients wait until the server serve the first client? And why, then, node js called a super backend language?
  
  – Andriy
  Mar 29 at 6:58
  

  
  
  
  

add a comment
 | 

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0

yes, server hangs if one endpoint is performing complex computations and if other endpoint requests, it must wait. Node has only one event loop and limited number of worker threads

You should not block the event loop. you should not perform the complex computations in node js synchronously or asynchronously.

Please refer this for more information:
https://nodejs.org/en/docs/guides/dont-block-the-event-loop/

share|improve this answer

answered Mar 29 at 7:50

Shekar ManiaShekar Mania

7933 bronze badges

add a comment
 | 

0

yes, server hangs if one endpoint is performing complex computations and if other endpoint requests, it must wait. Node has only one event loop and limited number of worker threads

You should not block the event loop. you should not perform the complex computations in node js synchronously or asynchronously.

Please refer this for more information:
https://nodejs.org/en/docs/guides/dont-block-the-event-loop/

share|improve this answer

answered Mar 29 at 7:50

Shekar ManiaShekar Mania

7933 bronze badges

add a comment
 | 

yes, server hangs if one endpoint is performing complex computations and if other endpoint requests, it must wait. Node has only one event loop and limited number of worker threads

You should not block the event loop. you should not perform the complex computations in node js synchronously or asynchronously.

Please refer this for more information:
https://nodejs.org/en/docs/guides/dont-block-the-event-loop/

share|improve this answer

answered Mar 29 at 7:50

Shekar ManiaShekar Mania

7933 bronze badges

share|improve this answer

answered Mar 29 at 7:50

Shekar ManiaShekar Mania

7933 bronze badges

answered Mar 29 at 7:50

Shekar ManiaShekar Mania

7933 bronze badges

answered Mar 29 at 7:50

Shekar ManiaShekar Mania

7933 bronze badges

0

Don't use while(true)

Use this instead:

setInterval(() => console.log('INTERVAL1'), 801);
// change 1000ms with time you need
setInterval(() => setInterval(() => console.log('INTERVAL2'), 1000) , 800);

share|improve this answer

answered Mar 28 at 22:15

MuathMuath

2,7341010 gold badges3232 silver badges5959 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It's not a question about what to use, it is a question about what occurs if one client on my Node Js server sends the request that will be processed too long. Will other clients wait until the server serve the first client? And why, then, node js called a super backend language?
  
  – Andriy
  Mar 29 at 6:58
  

  
  
  
  

add a comment
 | 

0

Don't use while(true)

Use this instead:

setInterval(() => console.log('INTERVAL1'), 801);
// change 1000ms with time you need
setInterval(() => setInterval(() => console.log('INTERVAL2'), 1000) , 800);

share|improve this answer

answered Mar 28 at 22:15

MuathMuath

2,7341010 gold badges3232 silver badges5959 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It's not a question about what to use, it is a question about what occurs if one client on my Node Js server sends the request that will be processed too long. Will other clients wait until the server serve the first client? And why, then, node js called a super backend language?
  
  – Andriy
  Mar 29 at 6:58
  

  
  
  
  

add a comment
 | 

Don't use while(true)

Use this instead:

setInterval(() => console.log('INTERVAL1'), 801);
// change 1000ms with time you need
setInterval(() => setInterval(() => console.log('INTERVAL2'), 1000) , 800);

share|improve this answer

answered Mar 28 at 22:15

MuathMuath

2,7341010 gold badges3232 silver badges5959 bronze badges

setInterval(() => console.log('INTERVAL1'), 801);
// change 1000ms with time you need
setInterval(() => setInterval(() => console.log('INTERVAL2'), 1000) , 800);

share|improve this answer

answered Mar 28 at 22:15

MuathMuath

2,7341010 gold badges3232 silver badges5959 bronze badges

answered Mar 28 at 22:15

MuathMuath

2,7341010 gold badges3232 silver badges5959 bronze badges

answered Mar 28 at 22:15

MuathMuath

2,7341010 gold badges3232 silver badges5959 bronze badges