On Sun, Nov 12, 2017 at 2:14 AM, T.J. Crowder < [email protected]> wrote:
> On Sun, Nov 12, 2017 at 9:56 AM, J Decker <[email protected]> wrote: > > Arrow functions passed as callback to Node.js addons execute 20% > > slower than regular 'function()' functions. > > **Wow**. Is that written up somewhere one could read more? > > When you say "Node.js addon," are you excluding built-in Node APIs? > Basically it was an empty function I was calling with some simple parameters It was only something I found through experimentation. It really has nothing to do with NodeJS other than it was an addon, it was just interacting with the V8 engine. Writing file... Wrote in 199 .. reading... ()=>{} Read in ... 300000 3394 function(){} Read in ... 300000 2690 https://github.com/d3x0r/sack.vfs/blob/master/tests/largeStreamtest.js#L15 and line 18 is the other one. In the function I just increment a counter.... 126% or 79.25% ...but then there is quite a bit of overhead in my library to parse the JSON. that's quite a nested object `{\"a${i}\":{\"b${i}\":{\"c${i}\":{\"d${i}\":123}}}}` -------------- Hmm... changed the file that was being generated to just a simple string, and the timings were closer (but was less than 1 second run) so I added some generation counts and ran the tests in various orders... and I guess maybe it was because of other factors that coincidentally showed as ()=>{} being slower than function(){} function(){} Read in ... 100000 958 ()=>{} Read in ... 100000 906 ()=>{} Read in ... 100000 784 function(){} Read in ... 100000 783 ()=>{} Read in ... 100000 924 function(){} Read in ... 100000 779 function(){} Read in ... 100000 881 ()=>{} Read in ... 100000 805 then just reversed the two tests in the original script and the timing stayed the same in-order... but then would show function() as being the slower one. My Bad; thanx for asking about that though I would have been stuck with that misconception for a long time. > -- T.J. Crowder >
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