Today I just activated that feature again (due to few recompiles of Thunderbird and Firefox in a row). While looking at it I realized that discrepancy. tfoerste@t44 ~ $ CCACHE_DIR=/var/tmp/ccache/ ccache -s cache directory /var/tmp/ccache/ cache hit (direct) 16 cache hit (preprocessed) 0 cache miss 378 called for link 4 called for preprocessing 22 compile failed 3 bad compiler arguments 12 autoconf compile/link 109 no input file 30 files in cache 760 cache size 40.3 Mbytes max cache size 1.0 Gbytes tfoerste@t44 ~ $ emerge --info ccache Portage 2.2.14 (python 3.3.5-final-0, hardened/linux/amd64, gcc-4.8.3, glibc-2.19-r1, 3.18.5-hardened-r1 x86_64) ================================================================= System Settings ================================================================= System uname: Linux-3.18.5-hardened-r1-x86_64-Intel-R-_Core-TM-_i5-4300U_CPU_@_1.90GHz-with-gentoo-2.2 KiB Mem: 12033668 total, 2878736 free KiB Swap: 16777212 total, 16398284 free Timestamp of tree: Mon, 09 Feb 2015 18:15:01 +0000 ld GNU ld (Gentoo 2.24 p1.4) 2.24 ccache version 3.1.9 [enabled] app-shells/bash: 4.2_p53 dev-java/java-config: 2.2.0 dev-lang/perl: 5.20.1-r4 dev-lang/python: 2.7.9-r1, 3.3.5-r1 dev-util/ccache: 3.1.9-r4 dev-util/cmake: 2.8.12.2-r1 dev-util/pkgconfig: 0.28-r1 sys-apps/baselayout: 2.2 sys-apps/openrc: 0.13.9 sys-apps/sandbox: 2.6-r1 sys-devel/autoconf: 2.13, 2.69 sys-devel/automake: 1.13.4 sys-devel/binutils: 2.24-r3 sys-devel/gcc: 4.8.3 sys-devel/gcc-config: 1.7.3 sys-devel/libtool: 2.4.4 sys-devel/make: 4.0-r1 sys-kernel/linux-headers: 3.16 (virtual/os-headers) sys-libs/glibc: 2.19-r1 Repositories: gentoo toralf ACCEPT_KEYWORDS="amd64" ACCEPT_LICENSE="*" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O2 -pipe -march=native" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/share/config /usr/share/gnupg/qualified.txt" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/php/apache2-php5.5/ext-active/ /etc/php/cgi-php5.5/ext-active/ /etc/php/cli-php5.5/ext-active/ /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/texmf/web2c" CXXFLAGS="-O2 -pipe -march=native" DISTDIR="/usr/portage/distfiles" EMERGE_DEFAULT_OPTS="--keep-going=y --nospinner --tree --quiet-build --deep --autounmask --autounmask-unrestricted-atoms --autounmask-write" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs ccache clean-logs config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch preserve-libs protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="http://mirror.netcologne.de/gentoo/ http://ftp.snt.utwente.nl/pub/os/linux/gentoo http://gentoo.mirror.dkm.cz/pub/gentoo/ http://ftp-stud.hs-esslingen.de/pub/Mirrors/gentoo/" LANG="en_US.utf8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" MAKEOPTS="-j3" PKGDIR="/usr/portage/packages" PORTAGE_CONFIGROOT="/" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/local/portage" SYNC="rsync://rsync.de.gentoo.org/gentoo-portage" USE="X acl aes-ni alsa amd64 apache2 avx avx2 berkdb bzip2 cli corefonts cracklib crypt cups custom-cflags custom-optimization cxx dbus dnssec dri drmkms dvd ecc fontconfig fortran fpm gdbm git gnuplot gtk gudev gui hardened iconv isag jpeg justify libav libvirtd logrotate macvtap mbox minizip mmx modules multilib mysql ncurses nls nptl ogg opengl openmp pam pax_kernel pcre pcre16 plasma png policykit qemu qt3support qt4 qt5 readline session spice sse sse2 sse4 sse4_1 sse4_2 ssh-askpass ssl ssse3 system-cairo system-icu system-jpeg system-libvpx system-sqlite tcpd theora thinkpad threads tk tls truetype uml unicode urandom usb usbredir uxa v4l v4l2 vaapi video vorbis xa xattr xkb xmp xscreensaver xtpax xvfb xvmc zenmap zlib" ABI_X86="64" ALSA_CARDS="hda-intel" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump author" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CPU_FLAGS_X86="aes avx avx2 fma3 mmx mmxext popcnt sse sse2 sse3 sse4_1 sse4_2 ssse3" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ublox ubx" INPUT_DEVICES="evdev synaptics" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LINGUAS="en en_GB" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-5" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_3" QEMU_SOFTMMU_TARGETS="x86_64 i386" QEMU_USER_TARGETS="x86_64 i386" RUBY_TARGETS="ruby19 ruby20" USERLAND="GNU" VIDEO_CARDS="intel i965" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account" Unset: CPPFLAGS, CTARGET, INSTALL_MASK, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON ================================================================= Package Settings ================================================================= dev-util/ccache-3.1.9-r4 was built with the following: USE="" ABI_X86="64"
aaand it's messier than that >=v3.2 uses 5GB (not 5GiB) [849766f72f593878ab8bdcba1a15be40a8a3beb9] Nov 2014 >=v3.0 uses 1GiB [921390869ad9a5c2961f93683772be4b82a5b569] Jun 2010 >=v2.0 uses 1GB [8597f3a880682b8a23be7eb9a27ca018e18ef492] Jan 2003 older versions had no limit not sure why the portage docs say 2GB at all ... it has since since at least 2005, and from looking at older 1.x history, i'm not seeing it being any different. at any rate, i've tweaked the docs to tell people to refer to the ccache docs for more information: http://gitweb.gentoo.org/proj/portage.git/commit/?id=d85f5c8c38c0dd296ef09b4b34bb40e20e84f2a8
Released in portage-2.2.20
