I am having a difficult problem with a server which is running a largish Perl script. What is happening is that most of the time everything works fine. However, sometimes (10%) when going to a new page you get half a page and then the browser sits there hanging. If you wait long enough you may or may not get the page. At first I thought it related to the script but this is not the case. The behaviour occurs even with a very simple script. Here is my test script - as you can see it is about as simple as you can get. The file it is printing is about 160kB
#!/usr/bin/perl open FILE, '/home/somedir/somefile' or die $!; $/ = ''; $file = <FILE>; print "Content-Type: text/plain\n\n"; print "Read file OK\n\n"; print $file;
Next I thought it must relate to my ADSL connection but I get vanilla HTML from this site served up lightning fast.
I have watched things with top and note the generation of the occasional zombie process when this behaviour occurs although this is not 100% consistent.
CPU load is <10%, 1.5MB of memory, low load, 1.5Mbps pipe.
I am at something of a loss as to how to proceed short of reinstalling Apache and Perl. Does anyone have suggestions? OS Red Hat 7.3, Apache 1.3.23, Perl 5.6.1. Details below.
[root@www cgi-bin]# httpd -v Server version: Apache/1.3.23 (Unix) (Red-Hat/Linux) Server built: Jun 19 2002 11:55:23 [root@www cgi-bin]#perl -V Summary of my perl5 (revision 5.0 version 6 subversion 1) configuratio +n: Platform: osname=linux, osvers=2.4.17-0.13smp, archname=i386-linux uname='linux daffy.perf.redhat.com 2.4.17-0.13smp #1 smp fri feb 1 + 10:30:48 est 2002 i686 unknown ' config_args='-des -Doptimize=-O2 -march=i386 -mcpu=i686 -Dcc=gcc - +Dcf_by=Red Hat, Inc. -Dcccdlflags=-fPIC -Dinstallprefix=/usr -Dprefix +=/usr -Darchname=i386-linux -Dvendorprefix=/usr -Dsiteprefix=/usr -Uu +sethreads -Uuseithreads -Uuselargefiles -Dd_dosuid -Dd_semctl_semun - +Di_db -Di_ndbm -Di_gdbm -Di_shadow -Di_syslog -Dman3ext=3pm' hint=recommended, useposix=true, d_sigaction=define usethreads=undef use5005threads=undef useithreads=undef usemultipl +icity=undef useperlio=undef d_sfio=undef uselargefiles=undef usesocks=undef use64bitint=undef use64bitall=undef uselongdouble=undef Compiler: cc='gcc', ccflags ='-fno-strict-aliasing -I/usr/local/include', optimize='-O2 -march=i386 -mcpu=i686', cppflags='-fno-strict-aliasing -I/usr/local/include' ccversion='', gccversion='2.96 20000731 (Red Hat Linux 7.2 2.96-10 +9)', gccosandvers='' intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234 d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=1 +2 ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', + lseeksize=4 alignbytes=4, usemymalloc=n, prototype=define Linker and Libraries: ld='gcc', ldflags =' -L/usr/local/lib' libpth=/usr/local/lib /lib /usr/lib libs=-lnsl -ldl -lm -lc -lcrypt -lutil perllibs=-lnsl -ldl -lm -lc -lcrypt -lutil libc=/lib/libc-2.2.5.so, so=so, useshrplib=false, libperl=libperl. +a Dynamic Linking: dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynami +c' cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib' Characteristics of this binary (from libperl): Compile-time options: Built under linux Compiled at Apr 1 2002 12:23:22 @INC: /usr/lib/perl5/5.6.1/i386-linux /usr/lib/perl5/5.6.1 /usr/lib/perl5/site_perl/5.6.1/i386-linux /usr/lib/perl5/site_perl/5.6.1 /usr/lib/perl5/site_perl/5.6.0 /usr/lib/perl5/site_perl /usr/lib/perl5/vendor_perl/5.6.1/i386-linux /usr/lib/perl5/vendor_perl/5.6.1 /usr/lib/perl5/vendor_perl .
cheers
tachyon
s&&rsenoyhcatreve&&&s&n.+t&"$'$`$\"$\&"&ee&&y&srve&&d&&print
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