A test with ROCK "cache_dir rock /var/cache/squid3 51200" gives very confusing results. I cleared the cache: rm -rf /var/cache/squid3/* squid -z squid http_proxy=http://139.2.57.120:3128/ wget http://test-server/freesurfer-Linux-centos6_x86_64-stable-pub-v5.3.0.tar The download starts with 10 MB/sec and stays constant for 1 minutes, then it drops gradually to 1 MB/sec and stays there for some time. After 5 minutes the download rate returns back to 10 MB/sec very quickly and drops again step-by-step to 1 MB/sec. After 5-6 minutes the download rates rises again to 10 MB/sec and drops again gradually to 1 MB/sec. During caching progress, we have 100 % CPU usage and a disk IO that is corresponds with the download rate. For further investigations I give you my build properties: squid -v Squid Cache: Version 3.5.6 Service Name: squid configure options: '--build=x86_64-linux-gnu' '--prefix=/usr' '--includedir=/include' '--mandir=/share/man' '--infodir=/share/info' '--sysconfdir=/etc' '--localstatedir=/var' '--libexecdir=/lib/squid3' '--srcdir=.' '--disable-maintainer-mode' '--disable-dependency-tracking' '--disable-silent-rules' '--datadir=/usr/share/squid3' '--sysconfdir=/etc/squid3' '--mandir=/usr/share/man' '--enable-inline' '--enable-async-io=8' '--enable-storeio=ufs,aufs,diskd,rock' '--enable-removal-policies=lru,heap' '--enable-delay-pools' '--enable-cache-digests' '--enable-underscores' '--enable-icap-client' '--enable-follow-x-forwarded-for' '--enable-auth-basic=DB,fake,getpwnam,LDAP,NCSA,NIS,PAM,POP3,RADIUS,SASL,SMB' '--enable-auth-digest=file,LDAP' '--enable-auth-negotiate=kerberos,wrapper' '--enable-auth-ntlm=fake,smb_lm' '--enable-external-acl-helpers=file_userip,kerberos_ldap_group,LDAP_group,session,SQL_session,unix_group,wbinfo_group' '--enable-url-rewrite-helpers=fake' '--enable-eui' '--enable-esi' '--enable-icmp' '--enable-zph-qos' '--enable-ecap' '--disable-translation' '--with-swapdir=/var/cache/squid3' '--with-logdir=/var/log/squid3' '--with-pidfile=/var/run/squid3.pid' '--with-filedescriptors=65536' '--with-large-files' '--with-default-user=proxy' '--enable-linux-netfilter' 'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -fPIE -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wall' 'LDFLAGS=-Wl,-Bsymbolic-functions -fPIE -pie -Wl,-z,relro -Wl,-z,now' 'CPPFLAGS=-D_FORTIFY_SOURCE=2' 'CXXFLAGS=-g -O2 -fPIE -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security' Gesendet: Mittwoch, 22. Juli 2015 um 21:47 Uhr Von: "Eliezer Croitoru" <eliezer@xxxxxxxxxxxx> An: squid-users@xxxxxxxxxxxxxxxxxxxxx Betreff: Re: Squid3: 100 % CPU load during object caching On 22/07/2015 21:59, Eliezer Croitoru wrote: > Hey Jens, > > I have tested the issue with LARGE ROCK and not AUFS or UFS. > Using squid or not my connection to the server is about 2.5 MBps (20Mbps). > Squid is sitting on an intel atom with SSD drive and on a HIT case the > download speed is more then doubled to 4.5 MBps(36Mbps). > I have not tried it with AUFS yet. And I must admit that AUFS beats rock cache with speed. I have tried rock with basic "cache_dir rock /var/spool/squid 8000" vs "cache_dir aufs /var/spool/squid 8000 16 256" and the aufs cache HIT results more then doubles 3 the speed rock gave with default settings. So about 15MBps which is 120Mbps. I do not seem to feel what Jens feels but the 100% CPU might be because of spinning disk hangs while reading the file from disk. Amos, I remember that there were some suggestions how to tune large rock. Any hints? I can test it and make it a suggestion for big files. Eliezer _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users
