Julia broadcasting demo

broadcasting.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "alone-valve",
   "metadata": {},
   "outputs": [],
   "source": [
    "using BenchmarkTools"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "dedicated-vegetable",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "1000"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "N = 1000"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "usual-delivery",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "BenchmarkTools.Trial: \n",
       "  memory estimate:  23.81 KiB\n",
       "  allocs estimate:  3\n",
       "  --------------\n",
       "  minimum time:     1.842 μs (0.00% GC)\n",
       "  median time:      2.640 μs (0.00% GC)\n",
       "  mean time:        3.430 μs (16.80% GC)\n",
       "  maximum time:     161.696 μs (96.76% GC)\n",
       "  --------------\n",
       "  samples:          10000\n",
       "  evals/sample:     9"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "function test1(a,b)\n",
    "    a[:] += 2 * b\n",
    "end\n",
    "\n",
    "a = zeros((N,))\n",
    "b = ones((N,))\n",
    "@benchmark test1(a, b)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "close-deficit",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "BenchmarkTools.Trial: \n",
       "  memory estimate:  0 bytes\n",
       "  allocs estimate:  0\n",
       "  --------------\n",
       "  minimum time:     129.597 ns (0.00% GC)\n",
       "  median time:      131.392 ns (0.00% GC)\n",
       "  mean time:        131.440 ns (0.00% GC)\n",
       "  maximum time:     187.410 ns (0.00% GC)\n",
       "  --------------\n",
       "  samples:          10000\n",
       "  evals/sample:     886"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "function test2(a,b)\n",
    "    a .+= 2 .* b\n",
    "end\n",
    "\n",
    "a = zeros((N,))\n",
    "b = ones((N,))\n",
    "@benchmark test2(a, b)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "id": "congressional-indie",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "BenchmarkTools.Trial: \n",
       "  memory estimate:  0 bytes\n",
       "  allocs estimate:  0\n",
       "  --------------\n",
       "  minimum time:     128.999 ns (0.00% GC)\n",
       "  median time:      130.196 ns (0.00% GC)\n",
       "  mean time:        130.254 ns (0.00% GC)\n",
       "  maximum time:     157.804 ns (0.00% GC)\n",
       "  --------------\n",
       "  samples:          10000\n",
       "  evals/sample:     886"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "function test3(a,b)\n",
    "    @. a += 2 * b\n",
    "end\n",
    "\n",
    "a = zeros((N,))\n",
    "b = ones((N,))\n",
    "@benchmark test3(a, b)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "viral-polish",
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
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  "kernelspec": {
   "display_name": "Julia 1.6.0",
   "language": "julia",
   "name": "julia-1.6"
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   "file_extension": ".jl",
   "mimetype": "application/julia",
   "name": "julia",
   "version": "1.6.0"
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