apcu_rw_test.php by @aaron
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Authored by Krinkle on May 20 2025, 8:31 PM.

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	F60322286: apcu_rw_test.php by @aaron
	May 20 2025, 8:31 PM

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	<?php
	# Author: Aaron Schulz
	# Archived from
	# https://gist.github.com/AaronSchulz/28a2cc7701a33adca1479b5ff6530b2c
	# https://phabricator.wikimedia.org/T293630#7879457

	testAPCUMixedReadsAndWrites();

	function testAPCUMixedReadsAndWrites() {
	$xhprof_shutdown_fn = null;
	if ( ( $_GET['profile'] ?? null ) === '1' ) {
	if ( function_exists( 'tideways_xhprof_enable' ) ) {
	tideways_xhprof_enable( TIDEWAYS_XHPROF_FLAGS_CPU );
	$xhprof_shutdown_fn = 'tideways_xhprof_disable';
	} elseif ( function_exists( 'tideways_enable' ) ) {
	tideways_enable( TIDEWAYS_XHPROF_FLAGS_CPU );
	$xhprof_shutdown_fn = 'tideways_disable';
	} elseif ( function_exists( 'xhprof_enable' ) ) {
	xhprof_enable( XHPROF_FLAGS_CPU );
	$xhprof_shutdown_fn = 'xhprof_disable';
	}
	}

	$overwrite = !empty( $_GET['overwrite'] );
	$minBytes = intval( $_GET['minSize'] ?? 128 );
	$maxBytes = intval( $_GET['maxSize'] ?? 1024 * 1024 );
	$keysCount = intval( $_GET['keysCount'] ?? 1000 );
	$keysPerRequest = intval( $_GET['keysPerRequest'] ?? $keysCount );
	$iterations = intval( $_GET['iterations'] ?? 1 );
	$ttl = intval( $_GET['ttl'] ?? 3600 );

	$referenceValue = null;
	$storeOK = 0;
	$storeFail = 0;
	foreach ( (array)array_rand( range( 1, $keysCount ), $keysPerRequest ) as $keyIndex ) {
	for ( $i = 0; $i < $iterations; ++$i ) {
	$copyKey = "global:testblobs:$keyIndex:$minBytes:$maxBytes";
	$copyValue = apcu_fetch( $copyKey );
	if ( $copyValue === false \|\| $overwrite ) {
	$referenceValue = $referenceValue
	?? str_repeat( hash('sha256', microtime() ), (int)ceil( $maxBytes / 64 ) );
	$copyValue = substr( $referenceValue, 0, mt_rand( $minBytes, $maxBytes ) );
	$ok = apcu_store( $copyKey, $copyValue, $ttl );
	if ( $ok ) {
	++$storeOK;
	} else {
	++$storeFail;
	}
	}
	}
	}

	header( 'Content-Type: text/javascript' );

	$data = [ 'store_ok' => $storeOK, 'store_fail' => $storeFail ];
	if ( $xhprof_shutdown_fn !== null ) {
	$profile = $xhprof_shutdown_fn();
	uasort(
	$profile,
	function ( $a, $b ) {
	return $b['wt'] <=> $a['wt'];
	}
	);
	$data += [ 'profile' => $profile ];
	}

	echo json_encode( $data, JSON_PRETTY_PRINT );
	}

Event Timeline

Krinkle created this paste.May 20 2025, 8:31 PM

Krinkle mentioned this in T293630: Investigate performance degradation at high concurrencies in php-fpm .

apcu_rw_test.php by @aaronActivePublicActions

Event Timeline

apcu_rw_test.php by @aaron
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