Otimizando o Apache

Question

Eu tenho lido vários guias de otimização para o apache e encontrei muitos dados (embora eu não tenha ideia de qual é a experiência dos autores).

Eu tenho um servidor de produção com o apache 2.2.3, o MySQL 5.1.36, o Centos 5.3, o nginx para atuar como um servidor proxy reverso (e manipular os arquivos estáticos).

Meu principal problema é que eu tenho cerca de 10 processos de httpd cada um ocupando até 56-60MB de RAM, e a cada 15 minutos atiro 10 processos php por meio de um crond (cada um ocupando 30MB também).

Basicamente eu estou operando com o httpd.conf padrão (sim, eu sei, isso é ruim), acabei de ajustar os clientes MPM max e outras propriedades controlando quantos clientes devem ser bifurcados, e instalado o nginx para reduzir a carga no apache .

Eu ficaria feliz com o tipo de otimização que eu poderia fazer para o meu httpd (eu sei que deveria estar descarregando muitos módulos, mas estou com medo de remover algo que poderia quebrar meu aplicativo).

21969 root      16   0  145m  30m 6872 S  1.3  0.9   0:00.75 php                                                                                                                 
 6031 apache    16   0  289m  59m  35m S  1.0  1.3   0:05.01 httpd           

Outra saída para um dos processos que estou executando:

[root@www /]# pmap -d 6031
6031:   /usr/sbin/httpd
Address           Kbytes Mode  Offset           Device    Mapping
00002b8b622e4000     308 r-x-- 0000000000000000 008:00003 httpd
00002b8b62331000     100 rw-s- 0000000000000000 000:00023   [ anon ]
00002b8b6234a000      32 rw-s- 0000000000000000 000:00023   [ anon ]
00002b8b62531000      16 rw--- 000000000004d000 008:00003 httpd
00002b8b62535000      12 rw--- 00002b8b62535000 000:00000   [ anon ]
00002b8b62538000     112 r-x-- 0000000000000000 008:00003 ld-2.5.so
00002b8b62554000       4 rw--- 00002b8b62554000 000:00000   [ anon ]
00002b8b6255a000       4 rw--- 00002b8b6255a000 000:00000   [ anon ]
00002b8b62753000       4 r---- 000000000001b000 008:00003 ld-2.5.so
00002b8b62754000       4 rw--- 000000000001c000 008:00003 ld-2.5.so
00002b8b62755000     520 r-x-- 0000000000000000 008:00003 libm-2.5.so
00002b8b627d7000    2044 ----- 0000000000082000 008:00003 libm-2.5.so
00002b8b629d6000       4 r---- 0000000000081000 008:00003 libm-2.5.so
00002b8b629d7000       4 rw--- 0000000000082000 008:00003 libm-2.5.so
00002b8b629d8000     108 r-x-- 0000000000000000 008:00003 libpcre.so.0.0.1
00002b8b629f3000    2048 ----- 000000000001b000 008:00003 libpcre.so.0.0.1
00002b8b62bf3000       4 rw--- 000000000001b000 008:00003 libpcre.so.0.0.1
00002b8b62bf4000      84 r-x-- 0000000000000000 008:00003 libselinux.so.1
00002b8b62c09000    2048 ----- 0000000000015000 008:00003 libselinux.so.1
00002b8b62e09000       8 rw--- 0000000000015000 008:00003 libselinux.so.1
00002b8b62e0b000       8 rw--- 00002b8b62e0b000 000:00000   [ anon ]
00002b8b62e0d000     112 r-x-- 0000000000000000 008:00003 libaprutil-1.so.0.2.7
00002b8b62e29000    2044 ----- 000000000001c000 008:00003 libaprutil-1.so.0.2.7
00002b8b63028000       8 rw--- 000000000001b000 008:00003 libaprutil-1.so.0.2.7
00002b8b6302a000      36 r-x-- 0000000000000000 008:00003 libcrypt-2.5.so
00002b8b63033000    2044 ----- 0000000000009000 008:00003 libcrypt-2.5.so
00002b8b63232000       4 r---- 0000000000008000 008:00003 libcrypt-2.5.so
00002b8b63233000       4 rw--- 0000000000009000 008:00003 libcrypt-2.5.so
00002b8b63234000     184 rw--- 00002b8b63234000 000:00000   [ anon ]
00002b8b63262000     224 r-x-- 0000000000000000 008:00003 libldap-2.3.so.0.2.31
00002b8b6329a000    2048 ----- 0000000000038000 008:00003 libldap-2.3.so.0.2.31
00002b8b6349a000       8 rw--- 0000000000038000 008:00003 libldap-2.3.so.0.2.31
00002b8b6349c000       4 rw--- 00002b8b6349c000 000:00000   [ anon ]
00002b8b6349d000      52 r-x-- 0000000000000000 008:00003 liblber-2.3.so.0.2.31
00002b8b634aa000    2048 ----- 000000000000d000 008:00003 liblber-2.3.so.0.2.31
00002b8b636aa000       4 rw--- 000000000000d000 008:00003 liblber-2.3.so.0.2.31
00002b8b636ab000     964 r-x-- 0000000000000000 008:00003 libdb-4.3.so
00002b8b6379c000    2044 ----- 00000000000f1000 008:00003 libdb-4.3.so
00002b8b6399b000      20 rw--- 00000000000f0000 008:00003 libdb-4.3.so
00002b8b639a0000     128 r-x-- 0000000000000000 008:00003 libexpat.so.0.5.0
00002b8b639c0000    2044 ----- 0000000000020000 008:00003 libexpat.so.0.5.0
00002b8b63bbf000      12 rw--- 000000000001f000 008:00003 libexpat.so.0.5.0
00002b8b63bc2000       4 rw--- 00002b8b63bc2000 000:00000   [ anon ]
00002b8b63bc3000     152 r-x-- 0000000000000000 008:00003 libapr-1.so.0.2.7
00002b8b63be9000    2048 ----- 0000000000026000 008:00003 libapr-1.so.0.2.7
00002b8b63de9000       4 rw--- 0000000000026000 008:00003 libapr-1.so.0.2.7
00002b8b63dea000      88 r-x-- 0000000000000000 008:00003 libpthread-2.5.so
00002b8b63e00000    2044 ----- 0000000000016000 008:00003 libpthread-2.5.so
00002b8b63fff000       4 r---- 0000000000015000 008:00003 libpthread-2.5.so
00002b8b64000000       4 rw--- 0000000000016000 008:00003 libpthread-2.5.so
00002b8b64001000      16 rw--- 00002b8b64001000 000:00000   [ anon ]
00002b8b64005000       8 r-x-- 0000000000000000 008:00003 libdl-2.5.so
00002b8b64007000    2048 ----- 0000000000002000 008:00003 libdl-2.5.so
00002b8b64207000       4 r---- 0000000000002000 008:00003 libdl-2.5.so
00002b8b64208000       4 rw--- 0000000000003000 008:00003 libdl-2.5.so
00002b8b64209000       4 rw--- 00002b8b64209000 000:00000   [ anon ]
00002b8b6420a000    1328 r-x-- 0000000000000000 008:00003 libc-2.5.so
00002b8b64356000    2048 ----- 000000000014c000 008:00003 libc-2.5.so
00002b8b64556000      16 r---- 000000000014c000 008:00003 libc-2.5.so
00002b8b6455a000       4 rw--- 0000000000150000 008:00003 libc-2.5.so
00002b8b6455b000      20 rw--- 00002b8b6455b000 000:00000   [ anon ]
00002b8b64560000     236 r-x-- 0000000000000000 008:00003 libsepol.so.1
00002b8b6459b000    2048 ----- 000000000003b000 008:00003 libsepol.so.1
00002b8b6479b000       4 rw--- 000000000003b000 008:00003 libsepol.so.1
00002b8b6479c000      40 rw--- 00002b8b6479c000 000:00000   [ anon ]
00002b8b647a6000      12 r-x-- 0000000000000000 008:00003 libuuid.so.1.2
00002b8b647a9000    2048 ----- 0000000000003000 008:00003 libuuid.so.1.2
00002b8b649a9000       4 rw--- 0000000000003000 008:00003 libuuid.so.1.2
00002b8b649aa000       4 rw--- 00002b8b649aa000 000:00000   [ anon ]
00002b8b649ab000     128 r-x-- 0000000000000000 008:00003 libpq.so.4.1
00002b8b649cb000    2048 ----- 0000000000020000 008:00003 libpq.so.4.1
00002b8b64bcb000       8 rw--- 0000000000020000 008:00003 libpq.so.4.1
00002b8b64bcd000     352 r-x-- 0000000000000000 008:00003 libsqlite3.so.0.8.6
00002b8b64c25000    2048 ----- 0000000000058000 008:00003 libsqlite3.so.0.8.6
00002b8b64e25000       8 rw--- 0000000000058000 008:00003 libsqlite3.so.0.8.6
00002b8b64e27000      68 r-x-- 0000000000000000 008:00003 libresolv-2.5.so
00002b8b64e38000    2048 ----- 0000000000011000 008:00003 libresolv-2.5.so
00002b8b65038000       4 r---- 0000000000011000 008:00003 libresolv-2.5.so
00002b8b65039000       4 rw--- 0000000000012000 008:00003 libresolv-2.5.so
00002b8b6503a000      12 rw--- 00002b8b6503a000 000:00000   [ anon ]
00002b8b6503d000      96 r-x-- 0000000000000000 008:00003 libsasl2.so.2.0.22
00002b8b65055000    2048 ----- 0000000000018000 008:00003 libsasl2.so.2.0.22
00002b8b65255000       4 rw--- 0000000000018000 008:00003 libsasl2.so.2.0.22
00002b8b65256000     272 r-x-- 0000000000000000 008:00003 libssl.so.0.9.8e
00002b8b6529a000    2048 ----- 0000000000044000 008:00003 libssl.so.0.9.8e
00002b8b6549a000      24 rw--- 0000000000044000 008:00003 libssl.so.0.9.8e
00002b8b654a0000    1204 r-x-- 0000000000000000 008:00003 libcrypto.so.0.9.8e
00002b8b655cd000    2044 ----- 000000000012d000 008:00003 libcrypto.so.0.9.8e
00002b8b657cc000     132 rw--- 000000000012c000 008:00003 libcrypto.so.0.9.8e
00002b8b657ed000      20 rw--- 00002b8b657ed000 000:00000   [ anon ]
00002b8b657f2000     580 r-x-- 0000000000000000 008:00003 libkrb5.so.3.3
00002b8b65883000    2048 ----- 0000000000091000 008:00003 libkrb5.so.3.3
00002b8b65a83000      16 rw--- 0000000000091000 008:00003 libkrb5.so.3.3
00002b8b65a87000      84 r-x-- 0000000000000000 008:00003 libnsl-2.5.so
00002b8b65a9c000    2044 ----- 0000000000015000 008:00003 libnsl-2.5.so
00002b8b65c9b000       4 r---- 0000000000014000 008:00003 libnsl-2.5.so
00002b8b65c9c000       4 rw--- 0000000000015000 008:00003 libnsl-2.5.so
00002b8b65c9d000      12 rw--- 00002b8b65c9d000 000:00000   [ anon ]
00002b8b65ca0000     176 r-x-- 0000000000000000 008:00003 libgssapi_krb5.so.2.2
00002b8b65ccc000    2048 ----- 000000000002c000 008:00003 libgssapi_krb5.so.2.2
00002b8b65ecc000       8 rw--- 000000000002c000 008:00003 libgssapi_krb5.so.2.2
00002b8b65ece000       8 r-x-- 0000000000000000 008:00003 libcom_err.so.2.1
00002b8b65ed0000    2044 ----- 0000000000002000 008:00003 libcom_err.so.2.1
00002b8b660cf000       4 rw--- 0000000000001000 008:00003 libcom_err.so.2.1
00002b8b660d0000     144 r-x-- 0000000000000000 008:00003 libk5crypto.so.3.1
00002b8b660f4000    2044 ----- 0000000000024000 008:00003 libk5crypto.so.3.1
00002b8b662f3000       8 rw--- 0000000000023000 008:00003 libk5crypto.so.3.1
00002b8b662f5000       4 rw--- 00002b8b662f5000 000:00000   [ anon ]
00002b8b662f6000      80 r-x-- 0000000000000000 008:00003 libz.so.1.2.3
00002b8b6630a000    2044 ----- 0000000000014000 008:00003 libz.so.1.2.3
00002b8b66509000       4 rw--- 0000000000013000 008:00003 libz.so.1.2.3
00002b8b6650a000      32 r-x-- 0000000000000000 008:00003 libkrb5support.so.0.1
00002b8b66512000    2044 ----- 0000000000008000 008:00003 libkrb5support.so.0.1
00002b8b66711000       4 rw--- 0000000000007000 008:00003 libkrb5support.so.0.1
00002b8b66712000       8 r-x-- 0000000000000000 008:00003 libkeyutils-1.2.so
00002b8b66714000    2044 ----- 0000000000002000 008:00003 libkeyutils-1.2.so
00002b8b66913000       4 rw--- 0000000000001000 008:00003 libkeyutils-1.2.so
00002b8b66914000      12 rw--- 00002b8b66914000 000:00000   [ anon ]
00002b8b66917000       8 r-x-- 0000000000000000 008:00003 mod_auth_basic.so
00002b8b66919000    2044 ----- 0000000000002000 008:00003 mod_auth_basic.so
00002b8b66b18000       8 rw--- 0000000000001000 008:00003 mod_auth_basic.so
00002b8b66b1a000      24 r-x-- 0000000000000000 008:00003 mod_auth_digest.so
00002b8b66b20000    2044 ----- 0000000000006000 008:00003 mod_auth_digest.so
00002b8b66d1f000       8 rw--- 0000000000005000 008:00003 mod_auth_digest.so
00002b8b66d21000       8 r-x-- 0000000000000000 008:00003 mod_authn_file.so
00002b8b66d23000    2044 ----- 0000000000002000 008:00003 mod_authn_file.so
00002b8b66f22000       8 rw--- 0000000000001000 008:00003 mod_authn_file.so
00002b8b66f24000       8 r-x-- 0000000000000000 008:00003 mod_authn_alias.so
00002b8b66f26000    2044 ----- 0000000000002000 008:00003 mod_authn_alias.so
00002b8b67125000       8 rw--- 0000000000001000 008:00003 mod_authn_alias.so
00002b8b67127000       4 r-x-- 0000000000000000 008:00003 mod_authn_anon.so
00002b8b67128000    2048 ----- 0000000000001000 008:00003 mod_authn_anon.so
00002b8b67328000       8 rw--- 0000000000001000 008:00003 mod_authn_anon.so
00002b8b6732a000       4 r-x-- 0000000000000000 008:00003 mod_authn_dbm.so
00002b8b6732b000    2048 ----- 0000000000001000 008:00003 mod_authn_dbm.so
00002b8b6752b000       8 rw--- 0000000000001000 008:00003 mod_authn_dbm.so
00002b8b6752d000       4 r-x-- 0000000000000000 008:00003 mod_authn_default.so
00002b8b6752e000    2044 ----- 0000000000001000 008:00003 mod_authn_default.so
00002b8b6772d000       8 rw--- 0000000000000000 008:00003 mod_authn_default.so
00002b8b6772f000       8 r-x-- 0000000000000000 008:00003 mod_authz_host.so
00002b8b67731000    2044 ----- 0000000000002000 008:00003 mod_authz_host.so
00002b8b67930000       8 rw--- 0000000000001000 008:00003 mod_authz_host.so
00002b8b67932000       4 r-x-- 0000000000000000 008:00003 mod_authz_user.so
00002b8b67933000    2044 ----- 0000000000001000 008:00003 mod_authz_user.so
00002b8b67b32000       8 rw--- 0000000000000000 008:00003 mod_authz_user.so
00002b8b67b34000       8 r-x-- 0000000000000000 008:00003 mod_authz_owner.so
00002b8b67b36000    2044 ----- 0000000000002000 008:00003 mod_authz_owner.so
00002b8b67d35000       8 rw--- 0000000000001000 008:00003 mod_authz_owner.so
00002b8b67d37000       8 r-x-- 0000000000000000 008:00003 mod_authz_groupfile.so
00002b8b67d39000    2044 ----- 0000000000002000 008:00003 mod_authz_groupfile.so
00002b8b67f38000       8 rw--- 0000000000001000 008:00003 mod_authz_groupfile.so
00002b8b67f3a000       8 r-x-- 0000000000000000 008:00003 mod_authz_dbm.so
00002b8b67f3c000    2044 ----- 0000000000002000 008:00003 mod_authz_dbm.so
00002b8b6813b000       8 rw--- 0000000000001000 008:00003 mod_authz_dbm.so
00002b8b6813d000       4 r-x-- 0000000000000000 008:00003 mod_authz_default.so
00002b8b6813e000    2044 ----- 0000000000001000 008:00003 mod_authz_default.so
00002b8b6833d000       8 rw--- 0000000000000000 008:00003 mod_authz_default.so
00002b8b6833f000      44 r-x-- 0000000000000000 008:00003 mod_ldap.so
00002b8b6834a000    2048 ----- 000000000000b000 008:00003 mod_ldap.so
00002b8b6854a000       8 rw--- 000000000000b000 008:00003 mod_ldap.so
00002b8b6854c000      24 r-x-- 0000000000000000 008:00003 mod_authnz_ldap.so
00002b8b68552000    2044 ----- 0000000000006000 008:00003 mod_authnz_ldap.so
00002b8b68751000       8 rw--- 0000000000005000 008:00003 mod_authnz_ldap.so
00002b8b68753000      36 r-x-- 0000000000000000 008:00003 mod_include.so
00002b8b6875c000    2048 ----- 0000000000009000 008:00003 mod_include.so
00002b8b6895c000       8 rw--- 0000000000009000 008:00003 mod_include.so
00002b8b6895e000      20 r-x-- 0000000000000000 008:00003 mod_log_config.so
00002b8b68963000    2044 ----- 0000000000005000 008:00003 mod_log_config.so
00002b8b68b62000       8 rw--- 0000000000004000 008:00003 mod_log_config.so
00002b8b68b64000       8 r-x-- 0000000000000000 008:00003 mod_logio.so
00002b8b68b66000    2044 ----- 0000000000002000 008:00003 mod_logio.so
00002b8b68d65000       8 rw--- 0000000000001000 008:00003 mod_logio.so
00002b8b68d67000       4 r-x-- 0000000000000000 008:00003 mod_env.so
00002b8b68d68000    2048 ----- 0000000000001000 008:00003 mod_env.so
00002b8b68f68000       8 rw--- 0000000000001000 008:00003 mod_env.so
00002b8b68f6a000      16 r-x-- 0000000000000000 008:00003 mod_ext_filter.so
00002b8b68f6e000    2044 ----- 0000000000004000 008:00003 mod_ext_filter.so
00002b8b6916d000       8 rw--- 0000000000003000 008:00003 mod_ext_filter.so
00002b8b6916f000      20 r-x-- 0000000000000000 008:00003 mod_mime_magic.so
00002b8b69174000    2044 ----- 0000000000005000 008:00003 mod_mime_magic.so
00002b8b69373000       8 rw--- 0000000000004000 008:00003 mod_mime_magic.so
00002b8b69375000       8 r-x-- 0000000000000000 008:00003 mod_expires.so
00002b8b69377000    2044 ----- 0000000000002000 008:00003 mod_expires.so
00002b8b69576000       8 rw--- 0000000000001000 008:00003 mod_expires.so
00002b8b69578000      16 r-x-- 0000000000000000 008:00003 mod_deflate.so
00002b8b6957c000    2044 ----- 0000000000004000 008:00003 mod_deflate.so
00002b8b6977b000       8 rw--- 0000000000003000 008:00003 mod_deflate.so
00002b8b6977d000      12 r-x-- 0000000000000000 008:00003 mod_headers.so
00002b8b69780000    2048 ----- 0000000000003000 008:00003 mod_headers.so
00002b8b69980000       8 rw--- 0000000000003000 008:00003 mod_headers.so
00002b8b69982000       8 r-x-- 0000000000000000 008:00003 mod_usertrack.so
00002b8b69984000    2048 ----- 0000000000002000 008:00003 mod_usertrack.so
00002b8b69b84000       8 rw--- 0000000000002000 008:00003 mod_usertrack.so
00002b8b69b86000       8 r-x-- 0000000000000000 008:00003 mod_setenvif.so
00002b8b69b88000    2048 ----- 0000000000002000 008:00003 mod_setenvif.so
00002b8b69d88000       8 rw--- 0000000000002000 008:00003 mod_setenvif.so
00002b8b69d8a000      16 r-x-- 0000000000000000 008:00003 mod_mime.so
00002b8b69d8e000    2044 ----- 0000000000004000 008:00003 mod_mime.so
00002b8b69f8d000       8 rw--- 0000000000003000 008:00003 mod_mime.so
00002b8b69f8f000      84 r-x-- 0000000000000000 008:00003 mod_dav.so
00002b8b69fa4000    2044 ----- 0000000000015000 008:00003 mod_dav.so
00002b8b6a1a3000       8 rw--- 0000000000014000 008:00003 mod_dav.so
00002b8b6a1a5000      16 r-x-- 0000000000000000 008:00003 mod_status.so
00002b8b6a1a9000    2044 ----- 0000000000004000 008:00003 mod_status.so
00002b8b6a3a8000       8 rw--- 0000000000003000 008:00003 mod_status.so
00002b8b6a3aa000      32 r-x-- 0000000000000000 008:00003 mod_autoindex.so
00002b8b6a3b2000    2044 ----- 0000000000008000 008:00003 mod_autoindex.so
00002b8b6a5b1000       8 rw--- 0000000000007000 008:00003 mod_autoindex.so
00002b8b6a5b3000      16 r-x-- 0000000000000000 008:00003 mod_info.so
00002b8b6a5b7000    2044 ----- 0000000000004000 008:00003 mod_info.so
00002b8b6a7b6000       8 rw--- 0000000000003000 008:00003 mod_info.so
00002b8b6a7b8000      44 r-x-- 0000000000000000 008:00003 mod_dav_fs.so
00002b8b6a7c3000    2044 ----- 000000000000b000 008:00003 mod_dav_fs.so
00002b8b6a9c2000       8 rw--- 000000000000a000 008:00003 mod_dav_fs.so
00002b8b6a9c4000       8 r-x-- 0000000000000000 008:00003 mod_vhost_alias.so
00002b8b6a9c6000    2044 ----- 0000000000002000 008:00003 mod_vhost_alias.so
00002b8b6abc5000       8 rw--- 0000000000001000 008:00003 mod_vhost_alias.so
00002b8b6abc7000      28 r-x-- 0000000000000000 008:00003 mod_negotiation.so
00002b8b6abce000    2044 ----- 0000000000007000 008:00003 mod_negotiation.so
00002b8b6adcd000       8 rw--- 0000000000006000 008:00003 mod_negotiation.so
00002b8b6adcf000       8 r-x-- 0000000000000000 008:00003 mod_dir.so
00002b8b6add1000    2044 ----- 0000000000002000 008:00003 mod_dir.so
00002b8b6afd0000       8 rw--- 0000000000001000 008:00003 mod_dir.so
00002b8b6afd2000       8 r-x-- 0000000000000000 008:00003 mod_actions.so
00002b8b6afd4000    2044 ----- 0000000000002000 008:00003 mod_actions.so
00002b8b6b1d3000       8 rw--- 0000000000001000 008:00003 mod_actions.so
00002b8b6b1d5000       8 r-x-- 0000000000000000 008:00003 mod_speling.so
00002b8b6b1d7000    2048 ----- 0000000000002000 008:00003 mod_speling.so
00002b8b6b3d7000       8 rw--- 0000000000002000 008:00003 mod_speling.so
00002b8b6b3d9000       8 r-x-- 0000000000000000 008:00003 mod_userdir.so
00002b8b6b3db000    2044 ----- 0000000000002000 008:00003 mod_userdir.so
00002b8b6b5da000       8 rw--- 0000000000001000 008:00003 mod_userdir.so
00002b8b6b5dc000      12 r-x-- 0000000000000000 008:00003 mod_alias.so
00002b8b6b5df000    2044 ----- 0000000000003000 008:00003 mod_alias.so
00002b8b6b7de000       8 rw--- 0000000000002000 008:00003 mod_alias.so
00002b8b6b7e0000      56 r-x-- 0000000000000000 008:00003 mod_rewrite.so
00002b8b6b7ee000    2044 ----- 000000000000e000 008:00003 mod_rewrite.so
00002b8b6b9ed000       8 rw--- 000000000000d000 008:00003 mod_rewrite.so
00002b8b6b9ef000      72 r-x-- 0000000000000000 008:00003 mod_proxy.so
00002b8b6ba01000    2044 ----- 0000000000012000 008:00003 mod_proxy.so
00002b8b6bc00000       8 rw--- 0000000000011000 008:00003 mod_proxy.so
00002b8b6bc02000      20 r-x-- 0000000000000000 008:00003 mod_proxy_balancer.so
00002b8b6bc07000    2044 ----- 0000000000005000 008:00003 mod_proxy_balancer.so
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Answer 1

Usar o http.conf padrão (ou muito próximo a ele) geralmente é uma coisa boa. Você ficaria surpreso com o quanto esses desenvolvedores de apache e engenheiros de redhat são melhores do que a maioria de nós:)

Primeiro, peço desculpas se isso parece estúpido, mas você tem certeza de que o nginx está configurado na frente do apache? Eu não posso te dizer quantas vezes eu vi as pessoas lerem um post no blog recomendando nginx e indo embora e configurar seus apache's existentes para mod_proxy / images de volta ao nginx.

Segundo, a maioria dos módulos do apache, especialmente aqueles que vêm em uma construção redhat / centos, são muito bem escritos para usar bibliotecas compartilhadas e o tempo de execução, portanto, não é provável que eles comprem muito para comentá-los.

Acho que a coisa mais importante que você provavelmente quer olhar é um cache do php op. Pode ter um efeito dramático tanto no desempenho quanto no uso de memória intermitente dos scripts php. Felizmente, como usuário do CentOS, você pode configurar o repositório EPEL e "yum install php-pecl-apc" e configurá-lo em instantes. Veja como isso ajuda.