php - PHP プロセス LD_LIBRARY_PATH 大きな CPU 使用率

Question

PHP プロセスが CPU を大量に使用している原因を突き止めています。サーバーは Apache mpm ワーカーです。下の suphp は「strace php」の出力の一部です。ご覧のとおり、プロセスは「正しくない」パスで dso を探しています。 PHP拡張機能をコンパイルしたばかりですが、検索パスを '/lib64:/usr/lib64' に指定する方法はありますか? なぜなら、多くのネガティブパスの試行の後、最終的に lib64 または /usr/lib64 のいずれかに dso がロードされていることがわかりました。これは、システム CPU を消費します。前もって感謝します。

open("/opt/xslt/lib/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/tidy/lib/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/mhash/lib/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/libmcrypt/lib/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/pcre/lib/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/curlssl/lib/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib64/mysql/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/xml2/lib/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/pcre/lib64/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/curlssl//lib64/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/php_with_imap_client//lib64/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/libmcrypt//lib64/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/mhash//lib64/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/tidy//lib64/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/xslt//lib64/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib64/tls/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib64/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/lib64/libselinux.so.1", O_RDONLY) = 3

open("/opt/xslt/lib/libsepol.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/tidy/lib/libsepol.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/mhash/lib/libsepol.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/libmcrypt/lib/libsepol.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/pcre/lib/libsepol.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/curlssl/lib/libsepol.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib64/mysql/libsepol.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/xml2/lib/libsepol.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/pcre/lib64/libsepol.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/curlssl//lib64/libsepol.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/php_with_imap_client//lib64/libsepol.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/libmcrypt//lib64/libsepol.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/mhash//lib64/libsepol.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/tidy//lib64/libsepol.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/xslt//lib64/libsepol.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib64/tls/libsepol.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib64/libsepol.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/lib64/libsepol.so.1", O_RDONLY)  = 3
open("/opt/xslt/lib/libnss_files.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/tidy/lib/libnss_files.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/mhash/lib/libnss_files.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/libmcrypt/lib/libnss_files.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/pcre/lib/libnss_files.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/curlssl/lib/libnss_files.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib64/mysql/libnss_files.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/xml2/lib/libnss_files.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/pcre/lib64/libnss_files.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/curlssl//lib64/libnss_files.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/php_with_imap_client//lib64/libnss_files.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/libmcrypt//lib64/libnss_files.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/mhash//lib64/libnss_files.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/tidy//lib64/libnss_files.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/xslt//lib64/libnss_files.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib64/tls/libnss_files.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib64/libnss_files.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/lib64/libnss_files.so.2", O_RDONLY) = 3

私の意見は正しいですか？または、以下が大きな CPU 使用率を引き起こしていますか?

lstat("/home", {st_mode=S_IFDIR|0711, st_size=4096, ...}) = 0
lstat("/home/socialth", {st_mode=S_IFDIR|0711, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components/com_content", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components/com_content/router.php", {st_mode=S_IFREG|0644, st_size=8157, ...}) = 0
stat("/home/socialth/public_html/components/com_content/router.php", {st_mode=S_IFREG|0644, st_size=8157, ...}) = 0
stat("/home/socialth/public_html/index.php", {st_mode=S_IFREG|0644, st_size=1971, ...}) = 0
access("/home/socialth/public_html/components/com_content/router.php", F_OK) = 0
lstat("/home", {st_mode=S_IFDIR|0711, st_size=4096, ...}) = 0
lstat("/home/socialth", {st_mode=S_IFDIR|0711, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components/com_content", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components/com_content/router.php", {st_mode=S_IFREG|0644, st_size=8157, ...}) = 0
lstat("/home", {st_mode=S_IFDIR|0711, st_size=4096, ...}) = 0
lstat("/home/socialth", {st_mode=S_IFDIR|0711, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components/com_content", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components/com_content/router.php", {st_mode=S_IFREG|0644, st_size=8157, ...}) = 0
stat("/home/socialth/public_html/components/com_content/router.php", {st_mode=S_IFREG|0644, st_size=8157, ...}) = 0
stat("/home/socialth/public_html/index.php", {st_mode=S_IFREG|0644, st_size=1971, ...}) = 0
access("/home/socialth/public_html/components/com_content/router.php", F_OK) = 0
lstat("/home", {st_mode=S_IFDIR|0711, st_size=4096, ...}) = 0
lstat("/home/socialth", {st_mode=S_IFDIR|0711, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components/com_content", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components/com_content/router.php", {st_mode=S_IFREG|0644, st_size=8157, ...}) = 0
lstat("/home", {st_mode=S_IFDIR|0711, st_size=4096, ...}) = 0
lstat("/home/socialth", {st_mode=S_IFDIR|0711, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components/com_content", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components/com_content/router.php", {st_mode=S_IFREG|0644, st_size=8157, ...}) = 0
stat("/home/socialth/public_html/components/com_content/router.php", {st_mode=S_IFREG|0644, st_size=8157, ...}) = 0
stat("/home/socialth/public_html/index.php", {st_mode=S_IFREG|0644, st_size=1971, ...}) = 0
access("/home/socialth/public_html/components/com_content/router.php", F_OK) = 0
lstat("/home", {st_mode=S_IFDIR|0711, st_size=4096, ...}) = 0
lstat("/home/socialth", {st_mode=S_IFDIR|0711, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components/com_content", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components/com_content/router.php", {st_mode=S_IFREG|0644, st_size=8157, ...}) = 0
lstat("/home", {st_mode=S_IFDIR|0711, st_size=4096, ...}) = 0
lstat("/home/socialth", {st_mode=S_IFDIR|0711, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components/com_content", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components/com_content/router.php", {st_mode=S_IFREG|0644, st_size=8157, ...}) = 0
stat("/home/socialth/public_html/components/com_content/router.php", {st_mode=S_IFREG|0644, st_size=8157, ...}) = 0
stat("/home/socialth/public_html/index.php", {st_mode=S_IFREG|0644, st_size=1971, ...}) = 0
access("/home/socialth/public_html/components/com_content/router.php", F_OK) = 0
lstat("/home", {st_mode=S_IFDIR|0711, st_size=4096, ...}) = 0
lstat("/home/socialth", {st_mode=S_IFDIR|0711, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components/com_content", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components/com_content/router.php", {st_mode=S_IFREG|0644, st_size=8157, ...}) = 0
lstat("/home", {st_mode=S_IFDIR|0711, st_size=4096, ...}) = 0
lstat("/home/socialth", {st_mode=S_IFDIR|0711, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components/com_content", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components/com_content/router.php", {st_mode=S_IFREG|0644, st_size=8157, ...}) = 0
stat("/home/socialth/public_html/components/com_content/router.php", {st_mode=S_IFREG|0644, st_size=8157, ...}) = 0    
stat("/home/socialth/public_html/index.php", {st_mode=S_IFREG|0644, st_size=1971, ...}) = 0
access("/home/socialth/public_html/components/com_content/router.php", F_OK) = 0
lstat("/home", {st_mode=S_IFDIR|0711, st_size=4096, ...}) = 0
lstat("/home/socialth", {st_mode=S_IFDIR|0711, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components/com_content", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components/com_content/router.php", {st_mode=S_IFREG|0644, st_size=8157, ...}) = 0
lstat("/home", {st_mode=S_IFDIR|0711, st_size=4096, ...}) = 0
lstat("/home/socialth", {st_mode=S_IFDIR|0711, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components/com_content", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components/com_content/router.php", {st_mode=S_IFREG|0644, st_size=8157, ...}) = 0
stat("/home/socialth/public_html/components/com_content/router.php", {st_mode=S_IFREG|0644, st_size=8157, ...}) = 0
stat("/home/socialth/public_html/index.php", {st_mode=S_IFREG|0644, st_size=1971, ...}) = 0
access("/home/socialth/public_html/components/com_content/router.php", F_OK) = 0
lstat("/home", {st_mode=S_IFDIR|0711, st_size=4096, ...}) = 0
lstat("/home/socialth", {st_mode=S_IFDIR|0711, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components/com_content", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/socialth/public_html/components/com_content/router.php", {st_mode=S_IFREG|0644, st_size=8157, ...}) = 0

score 0 · Accepted Answer

特に、これらのパッケージはすべて、独自の小さなディレクトリツリーにインストールされているため、これについてできることはあまりありません。/ optはパッケージ全体を相互に分離するための優れた概念ですが、システムの残りの部分に共有ライブラリを提供するそのようなパッケージは、ライブラリ検索パスに配置する必要があり、長い無意味なopen/になってしまうことを意味します。共有ライブラリが検索されると、statが呼び出されます。実行できる唯一の最適化は、パスを再配置して、使用頻度の低いライブラリが検索パスの最後に来るようにすることです。これにより、ヒットが「早く」発生し、ほとんど使用されない領域をチェックする時間を無駄にしません。

PHPオートローダーについても同様です。システムが各段階でアクセス権をチェックするため、特定のファイルに至るまでの長い統計チェーンも必要です。

ちなみに、これが.htaccessファイルの使用が推奨されない正確な理由です。.htaccessが有効になるとすぐに、Apacheは、要求されたファイルに至るまでのすべての単一ディレクトリをチェックして、.htaccessファイルが存在するかどうかを確認する必要があります。ファイルが存在する場合は、ロード/解析などする必要があります...これはすべて、ばかげた量のCPUサイクルとディスク帯域幅を浪費します。

.htaccessは開発/テスト中は問題ありませんが、機能するセットアップができたら、.htaccessディレクティブをメインサーバーの.confファイルに転送する必要があるため、サーバーの起動時に1回だけロード/解析されます。

php - PHP プロセス LD_LIBRARY_PATH 大きな CPU 使用率

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