I do like the idea; not everyone has a pcie gen4/5 ssd for builds, or rigorously trims sstate on a schedule. But there may be consequences or regressions, maybe RP will immediately shoot it down :)
I would however still place a single level of hash[:2] *under* the pn/task/, to avoid too many files piling up in a single directory. Can you send this as an RFC patch? Alex On Fri, 28 Jan 2022 at 08:06, Chen Qi <[email protected]> wrote: > Hi All, > > I'm sending out this email because I'm wondering if we can change the > sstate cache directory to use ${PN} and taskname as subditories. Hope to > hear your opinions. > > Below is the long story. > > Recently I noticed that running `bitbake xxx -c cleansstate' usually > takes more than 10 minutes. > > After some investigation, I can see that most of the time is spent on > file searching. This is because we have: > > SSTATE_PATHSPEC = > > "${SSTATE_DIR}/${SSTATE_EXTRAPATHWILDCARD}${PN}/${SSTATE_PATH_CURRTASK}/${SSTATE_PKGSPEC}*_${SSTATE_PATH_CURRTASK}.tar.zst*" > > And our sstate cache directory's hierarchy uses hash[:2]/hash[2:4]/ as > sub-directories. > > This essentially means that all sub-directories are searched. This would > take a long time, especially when run for the first time. I made some > changes to output the time and the logs are as below. > > $ bitbake glibc -c cleansstate > WARNING: glibc-2.34-r0 do_cleansstate: Removing > > /ala-lpggp72/qichen/LAT/builds/share/sstate-cache/*/*/sstate:glibc:core2-64-poky-linux:2.34:r0:core2-64:7:*_deploy_source_date_epoch.tar.zst* > WARNING: glibc-2.34-r0 do_cleansstate: Took 611.8865714073181 seconds > WARNING: glibc-2.34-r0 do_cleansstate: Removing > > /ala-lpggp72/qichen/LAT/builds/share/sstate-cache/*/*/sstate:glibc:core2-64-poky-linux:2.34:r0:core2-64:7:*_package.tar.zst* > WARNING: glibc-2.34-r0 do_cleansstate: Took 1.3219327926635742 seconds > WARNING: glibc-2.34-r0 do_cleansstate: Removing > > /ala-lpggp72/qichen/LAT/builds/share/sstate-cache/*/*/sstate:glibc:core2-64-poky-linux:2.34:r0:core2-64:7:*_package_qa.tar.zst* > WARNING: glibc-2.34-r0 do_cleansstate: Took 1.470815658569336 seconds > WARNING: glibc-2.34-r0 do_cleansstate: Removing > > /ala-lpggp72/qichen/LAT/builds/share/sstate-cache/*/*/sstate:glibc:core2-64-poky-linux:2.34:r0:core2-64:7:*_package_write_rpm.tar.zst* > WARNING: glibc-2.34-r0 do_cleansstate: Took 1.251939058303833 seconds > WARNING: glibc-2.34-r0 do_cleansstate: Removing > > /ala-lpggp72/qichen/LAT/builds/share/sstate-cache/*/*/sstate:glibc:core2-64-poky-linux:2.34:r0:core2-64:7:*_packagedata.tar.zst* > WARNING: glibc-2.34-r0 do_cleansstate: Took 1.2369801998138428 seconds > WARNING: glibc-2.34-r0 do_cleansstate: Removing > > /ala-lpggp72/qichen/LAT/builds/share/sstate-cache/*/*/sstate:glibc::2.34:r0::7:*_populate_lic.tar.zst* > WARNING: glibc-2.34-r0 do_cleansstate: Took 1.1668426990509033 seconds > WARNING: glibc-2.34-r0 do_cleansstate: Removing > > /ala-lpggp72/qichen/LAT/builds/share/sstate-cache/*/*/sstate:glibc:core2-64-poky-linux:2.34:r0:core2-64:7:*_populate_sysroot.tar.zst* > WARNING: glibc-2.34-r0 do_cleansstate: Took 1.385568380355835 seconds > WARNING: glibc-2.34-r0 do_cleansstate: Removing > > /ala-lpggp72/qichen/LAT/builds/share/sstate-cache/*/*/sstate:glibc:core2-64-poky-linux:2.34:r0:core2-64:7:*_stash_locale.tar.zst* > WARNING: glibc-2.34-r0 do_cleansstate: Took 1.4884181022644043 seconds > > I figured that unlike git, we do have knowledge on our sstate objects. > It does not seem necessary to use hash value as sub directory. So I > changed the sstate directory hierarchy to use ${PN}/taskname/ as sub > directories, and here's the result. > > $ bitbake libgcc -c cleansstate > > WARNING: libgcc-11.2.0-r0 do_cleansstate: Removing > > /ala-lpggp72/qichen/LAT/builds/share/sstate-cache/libgcc/deploy_source_date_epoch/sstate:libgcc:core2-64-poky-linux:11.2.0:r0:core2-64:7:*_deploy_source_date_epoch.tar.zst* > WARNING: libgcc-11.2.0-r0 do_cleansstate: Took 0.020630598068237305 seconds > WARNING: libgcc-11.2.0-r0 do_cleansstate: Removing > > /ala-lpggp72/qichen/LAT/builds/share/sstate-cache/libgcc/package/sstate:libgcc:core2-64-poky-linux:11.2.0:r0:core2-64:7:*_package.tar.zst* > WARNING: libgcc-11.2.0-r0 do_cleansstate: Took 0.0011608600616455078 > seconds > WARNING: libgcc-11.2.0-r0 do_cleansstate: Removing > > /ala-lpggp72/qichen/LAT/builds/share/sstate-cache/libgcc/package_qa/sstate:libgcc:core2-64-poky-linux:11.2.0:r0:core2-64:7:*_package_qa.tar.zst* > WARNING: libgcc-11.2.0-r0 do_cleansstate: Took 0.0007557868957519531 > seconds > WARNING: libgcc-11.2.0-r0 do_cleansstate: Removing > > /ala-lpggp72/qichen/LAT/builds/share/sstate-cache/libgcc/package_write_rpm/sstate:libgcc:core2-64-poky-linux:11.2.0:r0:core2-64:7:*_package_write_rpm.tar.zst* > WARNING: libgcc-11.2.0-r0 do_cleansstate: Took 0.0013995170593261719 > seconds > WARNING: libgcc-11.2.0-r0 do_cleansstate: Removing > > /ala-lpggp72/qichen/LAT/builds/share/sstate-cache/libgcc/packagedata/sstate:libgcc:core2-64-poky-linux:11.2.0:r0:core2-64:7:*_packagedata.tar.zst* > WARNING: libgcc-11.2.0-r0 do_cleansstate: Took 0.0007488727569580078 > seconds > WARNING: libgcc-11.2.0-r0 do_cleansstate: Removing > > /ala-lpggp72/qichen/LAT/builds/share/sstate-cache/libgcc/populate_lic/sstate:libgcc::11.2.0:r0::7:*_populate_lic.tar.zst* > WARNING: libgcc-11.2.0-r0 do_cleansstate: Took 0.0005896091461181641 > seconds > WARNING: libgcc-11.2.0-r0 do_cleansstate: Removing > > /ala-lpggp72/qichen/LAT/builds/share/sstate-cache/libgcc/populate_sysroot/sstate:libgcc:core2-64-poky-linux:11.2.0:r0:core2-64:7:*_populate_sysroot.tar.zst* > WARNING: libgcc-11.2.0-r0 do_cleansstate: Took 0.00080108642578125 seconds > > It's much faster. > > In addition, the sub dirs now give more info, which should potentially > make sstate cache easier to manage. > > Attached is the patch to quickly try things out. Hope to hear your > opinions. > > Best Regards, > > Chen Qi > > > > >
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