As recently discussed on the Yocto list in the "ROOTFS_RPM_DEBUG undocumented" thread, there are performance issues with dnf/rpm when building in a Docker container. The problem is due to the Docker container reporting the maximum number of open files as unlimited and there is code in rpm that loops over all potentially open file descriptors. Alexander Kanavin supplied a patch for rpm (see commit 6f1822e5 in meta) that was supposed to correct this, but unfortunately it only solved a part of the problem.
To really solve the problem, I reverted Alexander's patch, and applied a new one that solves both the problematic code identified by Alexander, and an identical code path in another function. It is possible to reproduce the problem without Docker by increasing the maximum number of open files. This can be done by editing /etc/security/limits.conf and adding: * - nofile 100000000 where 100000000 is the maximum number of open files. It is also very likely that you need to increase the global limit by running: sudo sysctl -w fs.nr_open=100000000 After that, ssh to localhost to get a new session where the new settings are active. Then you can use `ulimit -n <number>` to set the max you want to try. I also did som measurements when building core-image-minimal. Here are the times I got for the do_rootfs task with different maximums: Max files Time --------- ----- 1024 30 seconds 1048576 50 seconds 10000000 3 minutes 40 seconds 100000000 31 minutes //Peter The following changes since commit f4c938c47424424b89cde2269bd92cebc9a6ac1a: packagegroup: Do not add libssp to SDK (2018-05-09 10:47:51 +0100) are available in the git repository at: git://push.yoctoproject.org/poky-contrib pkj/rpm-performance Peter Kjellerstedt (2): Revert "rpm: add a patch to help with Docker performance issues" rpm: Assume a max limit of 1024 open files ...001-Assume-a-max-limit-of-1024-open-files.patch | 61 ++++++++++++++++++++++ ...FD_CLOEXEC-on-opened-files-before-exec-fr.patch | 49 ----------------- meta/recipes-devtools/rpm/rpm_4.14.1.bb | 3 +- 3 files changed, 63 insertions(+), 50 deletions(-) create mode 100644 meta/recipes-devtools/rpm/files/0001-Assume-a-max-limit-of-1024-open-files.patch delete mode 100644 meta/recipes-devtools/rpm/files/0001-Revert-Set-FD_CLOEXEC-on-opened-files-before-exec-fr.patch -- 2.12.0 -- _______________________________________________ Openembedded-core mailing list [email protected] http://lists.openembedded.org/mailman/listinfo/openembedded-core
