Updates on PHP performance increase

While waiting for PHP 7.4 production release and its strong type new feature, I was wondering how the performance increased. A while ago I wrote a small stress test which is not the most reliable in all cases, it just points out some major changes that started occurring in PHP 7.

Since that test, PHP 7.3 was released and now there is a release candidate for 7.4. While the memory usage is the same for my test case since 7.0, the execution time looks better with every new version.

#!/usr/bin/env bash

test=$(cat << 'eot'
$time = microtime(true);

$array = [];
for ($i = 0; $i < 10000; $i++) {
    if (!array_key_exists($i, $array)) {
        $array[$i] = [];
    }

    for ($j = 0; $j < 1000; $j++) {
        if (!array_key_exists($j, $array[$i])) {
            $array[$i][$j] = true;
        }
    }
}

echo sprintf(
    "Execution time: %f seconds\nMemory usage: %f MB\n\n",
    microtime(true) - $time,
    memory_get_usage(true) / 1042 / 1042
);
eot
)

versions=( 5.6 7.0 7.1 7.2 7.3 7.4-rc )

for v in "${versions[@]}"
do
    cmd="docker run --rm -ti php:${v}-cli-alpine php -d memory_limit=2048M -r '$test'"
    sh -c "echo ${v} && ${cmd}"
done

Results (ignore the absolute values, just watch the differences):

5.6
Execution time: 4.573347 seconds
Memory usage: 1332.009947 MB

7.0
Execution time: 1.464059 seconds
Memory usage: 347.669807 MB

7.1
Execution time: 1.315205 seconds
Memory usage: 347.669807 MB

7.2
Execution time: 0.653521 seconds
Memory usage: 347.669807 MB

7.3
Execution time: 0.614016 seconds
Memory usage: 347.669807 MB

7.4-rc
Execution time: 0.528052 seconds
Memory usage: 347.669807 MB

Match sorted and unsorted integers

I was wondering if there’s a performance difference between matching the integers from two slices, once if the numbers are sorted and once if they’re not. I didn’t stress the hell out of the situation, I went up to 10k numbers.

For small sets, of course, the difference is not worth mentioning. For large slices, if you really, really focus on performance, you could be better with sorted values, if the values are already sorted; if you sort them each time, the loss will be there.

var a = []int{ ... }
var b = []int{ ... }

func IterateNotSorted() int {
   count := 0
   for _, i := range a {
      for _, j := range b {
         if i == j {
            count++
            break
         }
      }
   }

   return count
}

var c = []int{ ... }
var d = []int{ ... }

func IterateSorted() int {
   count := 0
   for _, i := range c {
      for _, j := range d {
         if i == j {
            count++
            break
         }
      }
   }

   return count
}

Fill in the slices with some numbers and test it yourself.

func BenchmarkIterateNotSorted(b *testing.B) {
   for n := 0; n < b.N; n++ {
      IterateNotSorted()
   }
}

func BenchmarkIterateSorted(b *testing.B) {
   for n := 0; n < b.N; n++ {
      IterateSorted()
   }
}

 

PHP performance increase from 5.6 to 7.2

I remember when PHP 7 was released. The first thing I did was a simple performance test. I don’t remember the script exactly, but it was similar to this:

<?php

$time = microtime(true);

$array = [];
for ($i = 0; $i < 10000; $i++) {
    if (!array_key_exists($i, $array)) {
        $array[$i] = [];
    }
    
    for ($j = 0; $j < 1000; $j++) {
        if (!array_key_exists($j, $array[$i])) {
            $array[$i][$j] = true;
        }
    }
}

echo sprintf(
    "Execution time: %f seconds\nMemory usage: %f MB\n\n",
    microtime(true) - $time,
    memory_get_usage(true) / 1042 / 1042
);

The results made me really happy. Continue reading PHP performance increase from 5.6 to 7.2