OK this is my third message today, hopefully it will be the last.
I've built Apache 2.2.3 and mod_perl 2.0.3 with libapreq 2.08 and the
worker MPM. There appears to be some kind of race condition at startup
that prevents the server from coming up. This only happens once in a
while, and can be fixed by some minor configuration or code change (ie,
adding a 'print STDERR "foobar\n"' to one of my Perl modules can cause
the problem to occur; moving the print statement by one line can fix it).
There are two manifestations of this problem: either
(1) The first httpd process goes to 99% CPU usage and stays there
indefinitely, never doing a restart; or
(2) The restart occurs and the new parent process forks *one* child and
then goes to 99% CPU usage indefinitely, never completing the startup
sequence.
I've been porting a fairly complex pure-Perl legacy application from
mod_perl 1 to mod_perl 2. The reason we're trying this is because
memory requirements in MP1 are horrendous and child process death is
extremely expensive. The application appears to work fine once the
Apache2 server starts.
In addition, it's not unusual for the mod_perl 1 server to take a long
time to start up or shut down.
I suspect that there is some nasty interaction between my Perl modules
(of which there are many). Does anyone have suggestions on how I can
track down the problem? Apache2::Status is useless until the server
starts, obviously.
Here is my system information:
Apache/2.2.3 (Unix) mod_apreq2-20051231/2.6.0 mod_perl/2.0.3 Perl/v5.8.4
configured -- resuming normal operations
[Thu Nov 30 14:15:39 2006] [info] Server built: Nov 29 2006 17:32:31
Also, here is perl -V:
Summary of my perl5 (revision 5 version 8 subversion 4) configuration:
Platform:
osname=linux, osvers=2.6.15.4, archname=i386-linux-thread-multi
uname='linux ninsei 2.6.15.4 #1 smp preempt mon feb 20 09:48:53 pst
2006 i686 gnulinux '
config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN
-Dcccdlflags=-fPIC -Darchname=i386-linux -Dprefix=/usr
-Dprivlib=/usr/share/perl/5.8 -Darchlib=/usr/lib/perl/5.8
-Dvendorprefix=/usr -Dvendorlib=/usr/share/perl5
-Dvendorarch=/usr/lib/perl5 -Dsiteprefix=/usr/local
-Dsitelib=/usr/local/share/perl/5.8.4
-Dsitearch=/usr/local/lib/perl/5.8.4 -Dman1dir=/usr/share/man/man1
-Dman3dir=/usr/share/man/man3 -Dsiteman1dir=/usr/local/man/man1
-Dsiteman3dir=/usr/local/man/man3 -Dman1ext=1 -Dman3ext=3perl
-Dpager=/usr/bin/sensible-pager -Uafs -Ud_csh -Uusesfio -Uusenm
-Duseshrplib -Dlibperl=libperl.so.5.8.4 -Dd_dosuid -des'
hint=recommended, useposix=true, d_sigaction=define
usethreads=define use5005threads=undef useithreads=define
usemultiplicity=define
useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
use64bitint=undef use64bitall=undef uselongdouble=undef
usemymalloc=n, bincompat5005=undef
Compiler:
cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS
-DDEBIAN -fno-strict-aliasing -I/usr/local/include -D_LARGEFILE_SOURCE
-D_FILE_OFFSET_BITS=64',
optimize='-O2',
cppflags='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -DDEBIAN
-fno-strict-aliasing -I/usr/local/include'
ccversion='', gccversion='3.3.5 (Debian 1:3.3.5-13)', gccosandvers=''
intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t',
lseeksize=8
alignbytes=4, prototype=define
Linker and Libraries:
ld='cc', ldflags =' -L/usr/local/lib'
libpth=/usr/local/lib /lib /usr/lib
libs=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt
perllibs=-ldl -lm -lpthread -lc -lcrypt
libc=/lib/libc-2.3.2.so, so=so, useshrplib=true,
libperl=libperl.so.5.8.4
gnulibc_version='2.3.2'
Dynamic Linking:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib'
Characteristics of this binary (from libperl):
Compile-time options: MULTIPLICITY USE_ITHREADS USE_LARGE_FILES
PERL_IMPLICIT_CONTEXT
Built under linux
Compiled at Mar 23 2006 21:49:08
@INC:
/etc/perl
/usr/local/lib/perl/5.8.4
/usr/local/share/perl/5.8.4
/usr/lib/perl5
/usr/share/perl5
/usr/lib/perl/5.8
/usr/share/perl/5.8
/usr/local/lib/site_perl
.
Thanks again.
David
