Re: [Courier-imap] Errata release of courier and courier-imap packages.
Eugene Suprun writes: 21.03.2021 17:56, Sam Varshavchik пишет: Eugene Suprun writes: Try increasing /proc/sys/fs/inotify/max_user_instances Increased its value from 128 to 4096, no problems in an hour. Thanks for the tip. I am going to check it tomorrow, when there will be much more mail users. In any case, I think enabling inotify notification facility should be configurable: inotify structures require non-negligible amount of memory to maintain (and it can't be swapped out to disk) That's what that post said. Technically, that's obviously true. I am not very knowledgeable of the Linux kernel's internals; but this doesn't sound like something that demands megabytes of additional overhead per file descriptor. The difference between the two models is one process using a single inotify file descriptor to monitor all directories, versus each process using its own individual inotify file descriptors. Either way, the same set of directories gets monitored. I'd think the book-keeping for that will be what's taking up most of the resources. It's one inotify file descriptor having to carry around the necessary baggage to monitor a thousand directories, versus a few hundred processes using a couple of inotify file descriptors to monitor the same thousand directories (imapd monitors cur+new+keyword directories on one inotify descriptor). I can't see this by itself amounting to anything significant. Plus, I'd say that most of that would be recovered by not having the gam_server process around, or its predecessor, famd. That's worth a few megabytes, easily. I see that gam_server is linked with libglib: $ ldd /usr/libexec/gam_server linux-vdso.so.1 (0x7ffda33ba000) libglib-2.0.so.0 => /lib64/libglib-2.0.so.0 (0x7f2508a02000) libc.so.6 => /lib64/libc.so.6 (0x7f2508837000) libpcre.so.1 => /lib64/libpcre.so.1 (0x7f25087be000) libpthread.so.0 => /lib64/libpthread.so.0 (0x7f250879c000) /lib64/ld-linux-x86-64.so.2 (0x7f2508b75000) $ size /lib64/libglib-2.0.so.0 text data bss dec hex filename 123076946723112 1238553 12e619 /lib64/libglib-2.0.so.0 Unless someone also has something else running that requires Gnome stuff, that's an extra meg and a half (counting gam-server itself, but excluding pcre, it's likely there's something else that links with it), that's no longer needed. And, the less dependencies there is on the Gnome cruft, the better. As for alerting a user? It frustrates the user. May be also configurable setting? I definitely need to update the message itself. I don't know, though, of a better alerting mechanism. This is really exposing how bad IMAP clients respond to IMAP alerts. This alert does not break the connection, the IMAP client can continue, the IMAP session is still there. pgpDmR12MiA7Q.pgp Description: PGP signature ___ Courier-imap mailing list Courier-imap@lists.sourceforge.net Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-imap
Re: [Courier-imap] Errata release of courier and courier-imap packages.
21.03.2021 17:56, Sam Varshavchik пишет: Eugene Suprun writes: « HTML content follows » Hi Sam. Installed courier-imap 5.1.1 at the production server (1500 mailboxes), users get alerts in their clients (e.g. Mozilla Thunderbird) when jumping from a folder to another: Filesystem notification initialization error -- contact your mail administrator (check for configuration errors with the FAM/Gamin library) In /var/log/mail: Mar 21 16:57:49 mail imapd-ssl[1994]: LOGIN, mailto:user=u...@domain.org>user=u...@domain.org, ip=[194.158.XXX.YYY], port=[61752], protocol=IMAP Mar 21 16:57:49 mail imapd-ssl[1994]: Failed to create cache file: maildirwatch (mailto:u...@domain.org>u...@domain.org) Mar 21 16:57:49 mail imapd-ssl[1994]: Error: Too many open files Mar 21 16:57:50 mail imapd-ssl[1994]: Failed to create cache file: maildirwatch (mailto:u...@domain.org>u...@domain.org) Mar 21 16:57:50 mail imapd-ssl[1994]: Error: Too many open files openSuSE 15.2. I believe 'FAM/Gamin' should be replaced by 'inotify' in the alerts. inotifywait -m works fine at the server. Reinstalled courier-imap 5.0.14 Some Googling around suggests that this might be on a per-userid limit of inotify file descriptors: https://stackoverflow.com/questions/0245/inotify-fd-why-is-the-limit-per-user-id-and-not-per-process I'm guessing that all your mailboxes are virtual and use the same system userid. That is true. Try increasing /proc/sys/fs/inotify/max_user_instances Increased its value from 128 to 4096, no problems in an hour. Thanks for the tip. I am going to check it tomorrow, when there will be much more mail users. In any case, I think enabling inotify notification facility should be configurable: inotify structures require non-negligible amount of memory to maintain (and it can't be swapped out to disk) As for alerting a user? It frustrates the user. May be also configurable setting? Rough metric: number of concurrent IMAP sessions multiplied by 4. It's worth adding this to the installation notes. ___ Courier-imap mailing list Courier-imap@lists.sourceforge.net Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-imap ___ Courier-imap mailing list Courier-imap@lists.sourceforge.net Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-imap
Re: [Courier-imap] Errata release of courier and courier-imap packages.
Eugene Suprun writes: « HTML content follows » Hi Sam. Installed courier-imap 5.1.1 at the production server (1500 mailboxes), users get alerts in their clients (e.g. Mozilla Thunderbird) when jumping from a folder to another: Filesystem notification initialization error -- contact your mail administrator (check for configuration errors with the FAM/Gamin library) In /var/log/mail: Mar 21 16:57:49 mail imapd-ssl[1994]: LOGIN, mailto:user=u...@domain.org>user=u...@domain.org, ip=[194.158.XXX.YYY], port=[61752], protocol=IMAP Mar 21 16:57:49 mail imapd-ssl[1994]: Failed to create cache file: maildirwatch (mailto:u...@domain.org>u...@domain.org) Mar 21 16:57:49 mail imapd-ssl[1994]: Error: Too many open files Mar 21 16:57:50 mail imapd-ssl[1994]: Failed to create cache file: maildirwatch (mailto:u...@domain.org>u...@domain.org) Mar 21 16:57:50 mail imapd-ssl[1994]: Error: Too many open files openSuSE 15.2. I believe 'FAM/Gamin' should be replaced by 'inotify' in the alerts. inotifywait -m works fine at the server. Reinstalled courier-imap 5.0.14 Some Googling around suggests that this might be on a per-userid limit of inotify file descriptors: https://stackoverflow.com/questions/0245/inotify-fd-why-is-the-limit-per-user-id-and-not-per-process I'm guessing that all your mailboxes are virtual and use the same system userid. Try increasing /proc/sys/fs/inotify/max_user_instances Rough metric: number of concurrent IMAP sessions multiplied by 4. It's worth adding this to the installation notes. pgpHgtnng7pnZ.pgp Description: PGP signature ___ Courier-imap mailing list Courier-imap@lists.sourceforge.net Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-imap
Re: [Courier-imap] Errata release of courier and courier-imap packages.
Hi Sam. Installed courier-imap 5.1.1 at the production server (1500 mailboxes), users get alerts in their clients (e.g. Mozilla Thunderbird) when jumping from a folder to another: Filesystem notification initialization error -- contact your mail administrator (check for configuration errors with the FAM/Gamin library) In /var/log/mail: Mar 21 16:57:49 mail imapd-ssl[1994]: LOGIN, user=u...@domain.org, ip=[194.158.XXX.YYY], port=[61752], protocol=IMAP Mar 21 16:57:49 mail imapd-ssl[1994]: Failed to create cache file: maildirwatch (u...@domain.org) Mar 21 16:57:49 mail imapd-ssl[1994]: Error: Too many open files Mar 21 16:57:50 mail imapd-ssl[1994]: Failed to create cache file: maildirwatch (u...@domain.org) Mar 21 16:57:50 mail imapd-ssl[1994]: Error: Too many open files openSuSE 15.2. I believe 'FAM/Gamin' should be replaced by 'inotify' in the alerts. inotifywait -m works fine at the server. Reinstalled courier-imap 5.0.14 Regards, Eugene 21.03.2021 01:58, Sam Varshavchik пишет: Download: https://www.courier-mta.org/download.html New versions released of courier (1.1.1), courier-imap (5.1.1) packages. Changes: - courier: fix the RPM build script to build either with OpenSSL or GnuTLS. - courier, courier-imap: fix swapped TLS_CACHEFILE settings in the IMAP and POP3 configuration files. ___ Courier-imap mailing list Courier-imap@lists.sourceforge.net Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-imap ___ Courier-imap mailing list Courier-imap@lists.sourceforge.net Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-imap
