I've been reading multiple optimization guide for apache and found a lot of data (Although I have no idea what is the experience of the authors).
I have a production server with apache 2.2.3, MySQL 5.1.36, Centos 5.3, nginx to act as a reverse proxy server (and handle the static files).
My main problem is I have around 10 processes of httpd each taking up to 56-60MB RAM, and every 15 minutes I fire 10 php processes via a crond (each taking up 30MB aswell).
Basically I am operating with the default httpd.conf (yeah I know, this is bad), I have just tweaked the MPM max clients and other properties controlling how many clients shoudld be forked, and installed nginx to reduce load on apache.
I'd be happy what kind of optimization I could do to my httpd (I know I should be unloading lot of modules but I'm kinda scared than removing something could break my application).
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
Another output for one of the process I am running:
[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
00002b8b6be06000 8 rw--- 0000000000004000 008:00003 mod_proxy_balancer.so
00002b8b6be08000 28 r-x-- 0000000000000000 008:00003 mod_proxy_ftp.so
00002b8b6be0f000 2044 ----- 0000000000007000 008:00003 mod_proxy_ftp.so
00002b8b6c00e000 8 rw--- 0000000000006000 008:00003 mod_proxy_ftp.so
00002b8b6c010000 28 r-x-- 0000000000000000 008:00003 mod_proxy_http.so
00002b8b6c017000 2044 ----- 0000000000007000 008:00003 mod_proxy_http.so
00002b8b6c216000 8 rw--- 0000000000006000 008:00003 mod_proxy_http.so
00002b8b6c218000 8 r-x-- 0000000000000000 008:00003 mod_proxy_connect.so
00002b8b6c21a000 2044 ----- 0000000000002000 008:00003 mod_proxy_connect.so
00002b8b6c419000 8 rw--- 0000000000001000 008:00003 mod_proxy_connect.so
00002b8b6c41b000 28 r-x-- 0000000000000000 008:00003 mod_cache.so
00002b8b6c422000 2044 ----- 0000000000007000 008:00003 mod_cache.so
00002b8b6c621000 8 rw--- 0000000000006000 008:00003 mod_cache.so
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Using the default http.conf (or very close to it) is actually usually a good thing. You'd be surprised how much better at this apache developers and redhat engineers are than most of us :)
First off, and I apologize if this sounds dumb, but are you certain that nginx is configured in front of apache? I can't tell you how many times I've seen people read a blog post recommending nginx and gone and setup their existing apache's to mod_proxy /images back to nginx.
Second, most apache modules, especially the ones that come in a redhat/centos build, are very well written to use shared libraries and the apr runtime, so they're not likely to buy you much commenting them out.
I think the biggest thing you probably want to look at is a php op cache. It can have a dramatic affect on both the performance and the burst-memory-usage of php scripts. Fortunatly as a CentOS user you can setup the EPEL repo and "yum install php-pecl-apc" and have it setup in moments. See how that helps.