Hi, I've been having some issues with LMDB on i686/s390x when building python-zarr and its dependants. I filed a bug report [1], but the maintainer suggested asking here to get more reach. I have replicated my original message from the report below: The documentation for LMDB [2] states that the map size should be "chosen as large as possible". Consequently, the zarr developers have chosen a map size of 2**40 on 64-bit systems and 2**28 on 32-bit systems [3]. When the package is built on a 64-bit system [4], everything works fine. However, if the build is run on a 32-bit system [5], it fails with a MemoryError. I have narrowed this down to the mmap call at [6] which attempts to map the backing file into memory. AFAICT, the mapped size is far below the RAM on the build machine as well as far below the normal 32-bit VM limit. So I don't know why the call is failing. I can reproduce this in mock with the fedora-rawhide-i386 config, but what's weird is it also fails in the fedora-rawhide-s390x config. This machine has 16G of RAM, so it's enough for 2**28, but not 2**40. So it fails on 32-bit x86 with more than enough RAM, works on 64-bit x86 with nowhere near enough RAM, yet fails with 64-bit s390x. [1] https://bugzilla.redhat.com/show_bug.cgi?id=1695525 [2] http://www.lmdb.tech/doc/group__mdb.html#gaa2506ec8dab3d969b0e609cd82e619e5 [3] https://github.com/zarr-developers/zarr/blob/f6ced1e31b919065f8834d813ec081d2a85195b3/zarr/storage.py#L1585-L1587 [4] https://koji.fedoraproject.org/koji/taskinfo?taskID=33910305 [5] https://koji.fedoraproject.org/koji/taskinfo?taskID=33881973 [6] http://www.openldap.org/devel/gitweb.cgi?p=openldap.git;a=blob;f=libraries/liblmdb/mdb.c;h=e12af4482a0172da8d759c1da1530339d9095510;hb=2a5eaad6919ce6941dec4f0d5cce370707a00ba7#l4019 -- Elliott _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://getfedora.org/code-of-conduct.html List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx
