[nodejs]will kilos setTimeout spend too much resourece?

[jason.桂林]

I need to write a service use something like in memory cache, and I want to do `expire` things in setTimeout, will it very slow, If I expire too much things, about kilos to millions.

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Best regards,

Jason Green
桂林

[Joran Greef]

If you pass a function reference to an existing function to setTimeout, and then call this function repeatedly, rather than creating a closure each setTimeout call, that will lower your memory and cpu overhead substantially.

[jason.桂林]

Oh cool! and I found

setTimeout(console.log, 1000, 'hello world')

is much better than

setTimeout(function(){

   console.log('hello world');

}, 1000)

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[alFReD NSH]

I think for something like that you should decide how accurate you want to be and use a function on an interval to remove all expired things. Like run the function on every minute or every second, depending on your need. A  A lot of timers are not a good, and not that much accurate.

[jason.桂林]

Reasonable !

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