php - php进程LD_LIBRARY_PATH大cpu使用率

Question

我正在寻找 PHP 进程使用这么多 CPU 的原因，服务器是 Apache mpm worker + suphp 下面是“strace php”的一些输出，如您所见，该进程正在“不正确”路径中寻找 dso，这些是刚刚编译了 PHP 扩展，有没有办法将搜索路径指定为 '/lib64:/usr/lib64' ？因为我发现它在多次尝试负面路径后最终将 dso 加载到 lib64 或 /usr/lib64 中，这是系统 CPU 消耗，你知道，很多系统调用都是徒劳的。提前致谢。

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

我的意见正确吗？还是以下原因导致 CPU 使用率高？

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

您对此无能为力，尤其是因为所有这些软件包都已将自己安装在自己的小目录树中。虽然 /opt 是一个很好的概念，可以将整个包相互隔离，但这确实意味着任何为系统其余部分提供共享库的包都必须放入库搜索路径中，你最终会得到长时间无意义的打开/ stat 在搜索任何共享库时调用。您可以做的唯一优化可能是重新排列路径，以便不经常使用的库位于搜索路径的尾部，这样点击就会“更快”出现，并且不会浪费时间检查很少使用的区域。

你的 PHP 自动加载器也是如此。通向任何特定文件的长统计链也是必要的，因为系统会在每个阶段检查访问权限。

顺便说一句，这就是不鼓励使用 .htaccess 文件的确切原因。启用 .htaccess 后，Apache 必须检查通向请求文件的每个目录是否存在 .htaccess 文件。如果文件存在，则必须加载/解析/等...所有这些都会浪费大量的 CPU 周期和磁盘带宽。

.htaccess 在开发/测试时很好，但是一旦你有了一个可以工作的设置， .htaccess 指令应该被转移到主服务器的 .conf 文件中，所以它们只在服务器启动时加载/解析一次。

php - php进程LD_LIBRARY_PATH大cpu使用率

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