[squid-users] investigate squid eating 100% CPU

Hello,

        We have a Squid 3.1.23 running on a FreeBSD 8.3 (amd64)
        The proxy is used to handle web access for ~2500 workstations and in pure proxy/filter (squidGaurd) mode with no cache (all disk caching is disabled)
        It's not a tranparent/intercepting proxy, just a plain explicit proxy mode.

        What we see, is that the squid process is using 100% of CPU (userland CPU usage, not kernel) all the time. Even in late night when the whole traffic is very minimalistic.

        What I'm looking for is some advice on how to track down what is causing this CPU misbehaviour. Maybe it's some stupid config option not suitable for this kind of setup, maybe a bug etc.
        What would be the tools/methodology that I can use to profile the running process.
        
        Any help/suggestion would be really appreciated.

Youssef Ghorbal

squid -v
Squid Cache: Version 3.1.23
configure options: '--with-default-user=squid' '--bindir=/usr/local/sbin' '--sbindir=/usr/local/sbin' '--datadir=/usr/local/etc/squid' '--libexecdir=/usr/local/libexec/squid' '--localstatedir=/var/squid' '--sysconfdir=/usr/local/etc/squid' '--with-logdir=/var/log/squid' '--with-pidfile=/var/run/squid/squid.pid' '--enable-removal-policies=lru heap' '--disable-linux-netfilter' '--disable-linux-tproxy' '--disable-epoll' '--disable-translation' '--disable-ecap' '--disable-loadable-modules' '--enable-auth=basic digest negotiate ntlm' '--enable-basic-auth-helpers=DB NCSA PAM MSNT SMB squid_radius_auth LDAP YP' '--enable-digest-auth-helpers=password ldap' '--enable-external-acl-helpers=ip_user session unix_group wbinfo_group ldap_group' '--enable-ntlm-auth-helpers=smb_lm' '--enable-storeio=ufs diskd aufs' '--enable-disk-io=AIO Blocking DiskDaemon DiskThreads' '--enable-delay-pools' '--enable-icap-client' '--enable-kqueue' '--with-large-files' '--enable-stacktraces' '--disable-optimizations' '--prefix=/usr/local' '--mandir=/usr/local/man' '--infodir=/usr/local/info/' '--build=amd64-portbld-freebsd8.3' 'build_alias=amd64-portbld-freebsd8.3' 'CC=cc' 'CFLAGS=-pipe -I/usr/local/include -g -g -DLDAP_DEPRECATED' 'LDFLAGS= -L/usr/local/lib' 'CPPFLAGS=' 'CXX=c++' 'CXXFLAGS=-pipe -I/usr/local/include -g -g -DLDAP_DEPRECATED' 'CPP=cpp' --with-squid=/wrkdirs/usr/ports/www/squid31/work/squid-3.1.23 --enable-ltdl-convenience
Received on Tue Mar 26 2013 - 12:19:44 MDT