Try to install zend _ optimizer.. After installation i get this ???
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[Wed May 17 15:59:56 2006] [notice] Apache/1.3.35 (Unix) PHP/4.4.2 configured -- resuming normal operations
[Wed May 17 15:59:56 2006] [notice] Accept mutex: sysvsem (Default: sysvsem)
[Wed May 17 17:21:48 2006] [warn] child process 2003 still did not exit, sending a SIGTERM
[Wed May 17 17:21:48 2006] [warn] child process 2004 still did not exit, sending a SIGTERM
[Wed May 17 17:21:48 2006] [warn] child process 2005 still did not exit, sending a SIGTERM
[Wed May 17 17:21:48 2006] [warn] child process 2006 still did not exit, sending a SIGTERM
[Wed May 17 17:21:48 2006] [warn] child process 2007 still did not exit, sending a SIGTERM
[Wed May 17 17:21:48 2006] [warn] child process 2008 still did not exit, sending a SIGTERM
[Wed May 17 17:21:48 2006] [warn] child process 2009 still did not exit, sending a SIGTERM
[Wed May 17 17:21:48 2006] [warn] child process 2010 still did not exit, sending a SIGTERM
[Wed May 17 17:21:48 2006] [warn] child process 2011 still did not exit, sending a SIGTERM
[Wed May 17 17:21:48 2006] [warn] child process 2012 still did not exit, sending a SIGTERM
[Wed May 17 17:21:48 2006] [warn] child process 2141 still did not exit, sending a SIGTERM
[Wed May 17 17:21:48 2006] [warn] child process 2171 still did not exit, sending a SIGTERM
[Wed May 17 17:21:48 2006] [warn] child process 2216 still did not exit, sending a SIGTERM
[Wed May 17 17:21:48 2006] [warn] child process 3014 still did not exit, sending a SIGTERM
[Wed May 17 17:21:48 2006] [warn] child process 3963 still did not exit, sending a SIGTERM
[Wed May 17 17:21:53 2006] [notice] caught SIGTERM, shutting down
*** glibc detected *** /usr/local/apache/bin/httpd: corrupted double-linked list: 0x006f5158 ***
======= Backtrace: =========
/lib/libc.so.6[0x6272af]
/lib/libc.so.6[0x62935a]
/lib/libc.so.6(calloc+0x8e)[0x62a9a2]
/lib/ld-linux.so.2[0x5b20da]
/lib/ld-linux.so.2[0x5adec4]
/lib/ld-linux.so.2[0x5b0119]
/lib/ld-linux.so.2[0x5b9114]
/lib/ld-linux.so.2[0x5b56c9]
/lib/ld-linux.so.2[0x5b8c1a]
/lib/libdl.so.2[0x721e04]
/lib/ld-linux.so.2[0x5b56c9]
/lib/libdl.so.2[0x722400]
/lib/libdl.so.2(dlopen+0x3d)[0x721d49]
/usr/local/apache/bin/httpd(ap_os_dso_load+0x19)[0x807451f]
/usr/local/apache/bin/httpd[0x804f166]
/usr/local/apache/bin/httpd[0x8054bd5]
/usr/local/apache/bin/httpd(ap_handle_command+0x108)[0x80555e5]
/usr/local/apache/bin/httpd(ap_srm_command_loop+0x27)[0x805564d]
/usr/local/apache/bin/httpd(ap_process_resource_config+0x4fe)[0x8056176]
/usr/local/apache/bin/httpd(ap_read_config+0x62)[0x8056b06]
/usr/local/apache/bin/httpd[0x80623e6]
/usr/local/apache/bin/httpd(main+0x3ba)[0x8062db7]
/lib/libc.so.6(__libc_start_main+0xdc)[0x5da7e4]
/usr/local/apache/bin/httpd[0x804edb1]
======= Memory map: ========
003b5000-003b9000 r-xp 00000000 fd:00 26345490 /lib/libnss_dns-2.4.so
003b9000-003ba000 r-xp 00003000 fd:00 26345490 /lib/libnss_dns-2.4.so
003ba000-003bb000 rwxp 00004000 fd:00 26345490 /lib/libnss_dns-2.4.so
00418000-00421000 r-xp 00000000 fd:00 26345474 /lib/libnss_files-2.4.so
00421000-00422000 r-xp 00008000 fd:00 26345474 /lib/libnss_files-2.4.so
00422000-00423000 rwxp 00009000 fd:00 26345474 /lib/libnss_files-2.4.so
005a8000-005c1000 r-xp 00000000 fd:00 26345533 /lib/ld-2.4.so
005c1000-005c2000 r-xp 00018000 fd:00 26345533 /lib/ld-2.4.so
005c2000-005c3000 rwxp 00019000 fd:00 26345533 /lib/ld-2.4.so
005c5000-006f1000 r-xp 00000000 fd:00 26347835 /lib/libc-2.4.so
006f1000-006f4000 r-xp 0012b000 fd:00 26347835 /lib/libc-2.4.so
006f4000-006f5000 rwxp 0012e000 fd:00 26347835 /lib/libc-2.4.so
006f5000-006f8000 rwxp 006f5000 00:00 0
006fa000-0071d000 r-xp 00000000 fd:00 26347836 /lib/libm-2.4.so
0071d000-0071e000 r-xp 00022000 fd:00 26347836 /lib/libm-2.4.so
0071e000-0071f000 rwxp 00023000 fd:00 26347836 /lib/libm-2.4.so
00721000-00723000 r-xp 00000000 fd:00 26347837 /lib/libdl-2.4.so
00723000-00724000 r-xp 00001000 fd:00 26347837 /lib/libdl-2.4.so
00724000-00725000 rwxp 00002000 fd:00 26347837 /lib/libdl-2.4.so
0073c000-00742000 r-xp 00000000 fd:00 3717796 /usr/lib/libgdbm.so.2.0.0
00742000-00743000 rwxp 00005000 fd:00 3717796 /usr/lib/libgdbm.so.2.0.0
008e0000-008ff000 r-xp 00000000 fd:00 26347838 /lib/libexpat.so.0.5.0
008ff000-00901000 rwxp 0001e000 fd:00 26347838 /lib/libexpat.so.0.5.0
009bc000-009c7000 r-xp 00000000 fd:00 26347840 /lib/libgcc_s-4.1.0-20060304.so.1
009c7000-009c8000 rwxp 0000a000 fd:00 26347840 /lib/libgcc_s-4.1.0-20060304.so.1
00c1b000-00c20000 r-xp 00000000 fd:00 26347850 /lib/libcrypt-2.4.so
00c20000-00c21000 r-xp 00004000 fd:00 26347850 /lib/libcrypt-2.4.so
00c21000-00c22000 rwxp 00005000 fd:00 26347850 /lib/libcrypt-2.4.so
00c22000-00c49000 rwxp 00c22000 00:00 0
08048000-0808d000 r-xp 00000000 fd:00 4458992 /usr/local/apache/bin/httpd
0808d000-08094000 rwxp 00045000 fd:00 4458992 /usr/local/apache/bin/httpd
08094000-08095000 rwxp 08094000 00:00 0
0977c000-098ee000 rwxp 0977c000 00:00 0 [heap]
b7690000-b7890000 r-xp 00000000 fd:00 3707611 /usr/lib/locale/locale-archive
b79c9000-b79d8000 r-xp 00000000 fd:00 26347844 /lib/libresolv-2.4.so
b79d8000-b79d9000 r-xp 0000e000 fd:00 26347844 /lib/libresolv-2.4.so
b79d9000-b79da000 rwxp 0000f000 fd:00 26347844 /lib/libresolv-2.4.so
b79da000-b79dc000 rwxp b79da000 00:00 0
b7c3a000-b7c41000 r-xs 00000000 fd:00 3707870 /usr/lib/gconv/gconv-modules.cache
b7c44000-b7c50000 rwxp b7c44000 00:00 0
b7d00000-b7d21000 rwxp b7d00000 00:00 0
b7d21000-b7e00000 --xp b7d21000 00:00 0
b7eff000-b7f02000 rwxp b7eff000 00:00 0
b7f18000-b7f19000 rwxp b7f18000 00:00 0
b7f19000-b7f1a000 r-xp b7f19000 00:00 0 [vdso]
bf905000-bf919000 rwxp bf905000 00:00 0 [stack]
bf919000-bf91a000 rw-p bf919000 00:00 0
*** glibc detected *** /usr/local/apache/bin/httpd: corrupted double-linked list: 0x006f5158 ***
======= Backtrace: =========
/lib/libc.so.6[0x6272af]
/lib/libc.so.6[0x62935a]
/lib/libc.so.6(calloc+0x8e)[0x62a9a2]
/lib/ld-linux.so.2[0x5b20da]
/lib/ld-linux.so.2[0x5adec4]
/lib/ld-linux.so.2[0x5b0119]
/lib/ld-linux.so.2[0x5b9114]
/lib/ld-linux.so.2[0x5b56c9]
/lib/ld-linux.so.2[0x5b8c1a]
/lib/libdl.so.2[0x721e04]
/lib/ld-linux.so.2[0x5b56c9]
/lib/libdl.so.2[0x722400]
/lib/libdl.so.2(dlopen+0x3d)[0x721d49]
/usr/local/apache/bin/httpd(ap_os_dso_load+0x19)[0x807451f]
/usr/local/apache/bin/httpd[0x804f166]
/usr/local/apache/bin/httpd[0x8054bd5]
/usr/local/apache/bin/httpd(ap_handle_command+0x108)[0x80555e5]
/usr/local/apache/bin/httpd(ap_srm_command_loop+0x27)[0x805564d]
/usr/local/apache/bin/httpd(ap_process_resource_config+0x4fe)[0x8056176]
/usr/local/apache/bin/httpd(ap_read_config+0x62)[0x8056b06]
/usr/local/apache/bin/httpd[0x80623e6]
/usr/local/apache/bin/httpd(main+0x3ba)[0x8062db7]
/lib/libc.so.6(__libc_start_main+0xdc)[0x5da7e4]
/usr/local/apache/bin/httpd[0x804edb1]