Commits on Jan 22, 2018

1. async_hooks: use typed array stack as fast path …

   - Communicate the current async stack length through a
     typed array field rather than a native binding method
   - Add a new fixed-size `async_ids_fast_stack` typed array
     that contains the async ID stack up to a fixed limit.
     This increases performance noticeably, since most of the time
     the async ID stack will not be more than a handful of
     levels deep.
   - Make the JS `pushAsyncIds()` and `popAsyncIds()` functions
     do the same thing as the native ones if the fast path
     is applicable.
   
   Benchmarks:
   
       $ ./node benchmark/compare.js --new ./node --old ./node-master --runs 10 --filter next-tick process | Rscript benchmark/compare.R
       [00:03:25|% 100| 6/6 files | 20/20 runs | 1/1 configs]: Done
                                                      improvement confidence      p.value
        process/next-tick-breadth-args.js millions=4     19.72 %        *** 3.013913e-06
        process/next-tick-breadth.js millions=4          27.33 %        *** 5.847983e-11
        process/next-tick-depth-args.js millions=12      40.08 %        *** 1.237127e-13
        process/next-tick-depth.js millions=12           77.27 %        *** 1.413290e-11
        process/next-tick-exec-args.js millions=5        13.58 %        *** 1.245180e-07
        process/next-tick-exec.js millions=5             16.80 %        *** 2.961386e-07
   
   PR-URL: nodejs#17780
   Reviewed-By: James M Snell <jasnell@gmail.com>

   

   addaleax committed Jan 22, 2018
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