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Itamar Levy-Or
2021-08-30 13:37:37 -04:00
parent 0af673491a
commit 12d75943a4
2 changed files with 157 additions and 68 deletions
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crt/aws-crt-ffi
+1 -1
Submodule crt/aws-crt-ffi updated: 94e82ef7b4...927850d2e7
tests/CrcTest.php
+151 -62
View File
@@ -9,82 +9,171 @@ require_once('common.inc');
final class CrcTest extends CrtTestCase {
public function testCrc32ZeroesOneShot() {
$input = implode(array_map("chr", array_fill(0, 32, 0)));
$output = CRT::crc32($input);
$expected = 0x190A55AD;
$this->assertEquals($output, $expected);
// public function testCrc32ZeroesOneShot() {
// $input = implode(array_map("chr", array_fill(0, 32, 0)));
// $output = CRT::crc32($input);
// $expected = 0x190A55AD;
// $this->assertEquals($output, $expected);
// }
// public function testCrc32ZeroesIterated() {
// $output = 0;
// for ($i = 0; $i < 32; $i++) {
// $output = CRT::crc32("\x00", $output);
// }
// $expected = 0x190A55AD;
// $this->assertEquals($output, $expected);
// }
// public function testCrc32ValuesOneShot() {
// $input = implode(array_map("chr", range(0, 31)));
// $output = CRT::crc32($input);
// $expected = 0x91267E8A;
// $this->assertEquals($output, $expected);
// }
// public function testCrc32ValuesIterated() {
// $output = 0;
// foreach (range(0, 31) as $n) {
// $output = CRT::crc32(chr($n), $output);
// }
// $expected = 0x91267E8A;
// $this->assertEquals($output, $expected);
// }
// public function testCrc32LargeBuffer() {
// $input = implode(array_map("chr", array_fill(0, 1 << 20, 0)));
// $output = CRT::crc32($input);
// $expected = 0xA738EA1C;
// $this->assertEquals($output, $expected);
// }
// public function testCrc32cZeroesOneShot() {
// $input = implode(array_map("chr", array_fill(0, 32, 0)));
// $output = CRT::crc32c($input);
// $expected = 0x8A9136AA;
// $this->assertEquals($output, $expected);
// }
// public function testCrc32cZeroesIterated() {
// $output = 0;
// for ($i = 0; $i < 32; $i++) {
// $output = CRT::crc32c("\x00", $output);
// }
// $expected = 0x8A9136AA;
// $this->assertEquals($output, $expected);
// }
// public function testCrc32cValuesOneShot() {
// $input = implode(array_map("chr", range(0, 31)));
// $output = CRT::crc32c($input);
// $expected = 0x46DD794E;
// $this->assertEquals($output, $expected);
// }
// public function testCrc32cValuesIterated() {
// $output = 0;
// foreach (range(0, 31) as $n) {
// $output = CRT::crc32c(chr($n), $output);
// }
// $expected = 0x46DD794E;
// $this->assertEquals($output, $expected);
// }
// public function testCrc32cLargeBuffer() {
// $input = implode(array_map("chr", array_fill(0, 1 << 20, 0)));
// $output = CRT::crc32c($input);
// $expected = 0x14298C12;
// $this->assertEquals($output, $expected);
// }
private function update_summary($count, &$mean, &$M2, &$my_min, &$my_max, $new_value) {
$delta = $new_value - $mean;
$mean += $delta / $count;
$delta2 = $new_value - $mean;
$M2 += $delta * $delta2;
$my_min = min($my_min, $new_value);
$my_max = max($my_max, $new_value);
}
public function testCrc32ZeroesIterated() {
$output = 0;
for ($i = 0; $i < 32; $i++) {
$output = CRT::crc32("\x00", $output);
}
$expected = 0x190A55AD;
$this->assertEquals($output, $expected);
private function finalize_summary($count, $M2) {
return $M2 / $count;
}
public function testCrc32ValuesOneShot() {
$input = implode(array_map("chr", range(0, 31)));
$output = CRT::crc32($input);
$expected = 0x91267E8A;
$this->assertEquals($output, $expected);
private function print_stats($means, $variances, $mins, $maxs, $chunk_sizes){
$len = count($means);
for ($i = 0; $i < count($means); $i++){
echo("chunk size: {$chunk_sizes[$i]}, min: {$mins[$i]}, max: {$maxs[$i]}, mean: {$means[$i]}, variance: {$variances[$i]}\n");
}
}
public function testCrc32ValuesIterated() {
$output = 0;
foreach (range(0, 31) as $n) {
$output = CRT::crc32(chr($n), $output);
private function profile_sequence_chunks($to_hash, $chunk_size, $iterations, $checksum_fn){
$mean = 0;
$M2 = 0;
$min = INF;
$max = 0;
for ($x = 0; $x < $iterations; $x++){
$i = 0;
$prev = 0;
$start = microtime(true);
while($i + $chunk_size < strlen($to_hash)){
$prev = $checksum_fn(substr($to_hash, $i, $chunk_size), $prev);
$i = $i + $chunk_size;
}
$expected = 0x91267E8A;
$this->assertEquals($output, $expected);
$prev = $checksum_fn(substr($to_hash, $i), $prev);
$end = microtime(true);
$this->update_summary($x + 1, $mean, $M2, $min, $max, ($end - $start) * 1000000000);
}
return $mean;
}
public function testCrc32LargeBuffer() {
$input = implode(array_map("chr", array_fill(0, 1 << 20, 0)));
$output = CRT::crc32($input);
$expected = 0xA738EA1C;
$this->assertEquals($output, $expected);
private function profile_sequence($to_hash, $chunk_sizes, $iterations_per_sequence, $checksum_fn) {
$times = [];
for($i = 0; $i < count($chunk_sizes); $i++) {
$this->profile_sequence_chunks($to_hash, $chunk_sizes[$i], $iterations_per_sequence, $checksum_fn);
array_push($times, $this->profile_sequence_chunks($to_hash, $chunk_sizes[$i], $iterations_per_sequence, $checksum_fn));
}
return $times;
}
public function testCrc32cZeroesOneShot() {
$input = implode(array_map("chr", array_fill(0, 32, 0)));
$output = CRT::crc32c($input);
$expected = 0x8A9136AA;
$this->assertEquals($output, $expected);
private function profile($size, $chunk_sizes, $num_sequences, $iterations_per_sequence, $checksum_fn){
$means = array_fill(0, count($chunk_sizes), 0);
$variances = array_fill(0, count($chunk_sizes), 0);
$mins = array_fill(0, count($chunk_sizes), INF);
$maxs = array_fill(0, count($chunk_sizes), 0);
for($x = 0; $x < $num_sequences; $x++){
$buffer = random_bytes($size);
$times = $this->profile_sequence($buffer, $chunk_sizes, $iterations_per_sequence, $checksum_fn);
for($i = 0; $i < count($chunk_sizes); $i++) {
$stats = $this->update_summary($x + 1, $means[$i], $variances[$i], $mins[$i], $maxs[$i], $times[$i]);
}
}
for ($i = 0; $i < count($variances); $i++){
$variances[$i] = $this->finalize_summary($num_sequences, $variances[$i]);
}
$this->print_stats($means, $variances, $mins, $maxs, $chunk_sizes);
}
public function testCrc32cZeroesIterated() {
$output = 0;
for ($i = 0; $i < 32; $i++) {
$output = CRT::crc32c("\x00", $output);
}
$expected = 0x8A9136AA;
$this->assertEquals($output, $expected);
}
public function testCrcBenchmark() {
// $input = implode(array_map("chr", array_fill(0, 1 << 20, 0)));
// $output = CRT::crc32c($input);
// $expected = 0x14298C12;
// $this->assertEquals($output, $expected);
public function testCrc32cValuesOneShot() {
$input = implode(array_map("chr", range(0, 31)));
$output = CRT::crc32c($input);
$expected = 0x46DD794E;
$this->assertEquals($output, $expected);
// echo("\ncrc32\n");
$chunk_sizes = [1 << 22, 1 << 20, 1 << 10, 1 << 9, 1 << 8, 1 << 7];
// profile(1 << 22, chunk_sizes, 1000, 1, CRT::crc32);
echo("\ncrc32c\n");
$this->profile(
1 << 22,
$chunk_sizes,
10,
1,
function($in, $prev) {
CRT::crc32c($in, $prev);
}
public function testCrc32cValuesIterated() {
$output = 0;
foreach (range(0, 31) as $n) {
$output = CRT::crc32c(chr($n), $output);
);
$this->assertEquals(1, 1);
}
$expected = 0x46DD794E;
$this->assertEquals($output, $expected);
}
public function testCrc32cLargeBuffer() {
$input = implode(array_map("chr", array_fill(0, 1 << 20, 0)));
$output = CRT::crc32c($input);
$expected = 0x14298C12;
$this->assertEquals($output, $expected);
}
}