Test for compress/decompress performance

gziptest.php

<?php
ini_set('memory_limit', '8G');
$raw = file_get_contents('lib.tar');
$length = strlen($raw);
echo "Loaded file " . $length . " bytes\n";
$chunks = [];
for ($i = 0; $i < $length - 100*1024; $i += 100*1024) {
  $chunks[] = substr($raw, $i, 100*1024);
}
echo "Created " . count($chunks) . " 100KB chunks\n";
$compressed = [];
$before = microtime(true);
foreach ($chunks as $chunk) {
  //$compressed[] = gzencode($chunk);
  $compressed[] = zstd_compress($chunk);
}
$after = microtime(true);
$duration = $after - $before;
echo "Compressed " . round($duration, 3) . 's (per chunk ' . round(1000 * $duration / count($chunks), 1) . " ms)\n";
$back = [];
$before = microtime(true);
foreach ($compressed as $chunk) {
  //$back[] = gzencode($chunk);
  $back[] = zstd_uncompress($chunk);
}
$after = microtime(true);
$duration = $after - $before;
echo "Deompressed " . round($duration, 3) . 's (per chunk ' . round(1000 * $duration / count($chunks), 1) . " ms)\n";