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set dovecot vsz_limit to 1/3 of available memory (#1096)
The `default_vsz_limit` is the maximum amount of virtual memory that can be allocated. It should be set *reasonably high* to avoid allocation issues with larger mailboxes. We're setting it to 1/3 of the total available memory (physical mem + swap) to be sure. See here for discussion: - https://www.dovecot.org/list/dovecot/2012-August/137569.html - https://www.dovecot.org/list/dovecot/2011-December/132455.html
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@ -37,8 +37,16 @@ apt_install \
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# of active IMAP connections (at, say, 5 open connections per user that
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# would be 20 users). Set it to 250 times the number of cores this
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# machine has, so on a two-core machine that's 500 processes/100 users).
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# The `default_vsz_limit` is the maximum amount of virtual memory that
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# can be allocated. It should be set *reasonably high* to avoid allocation
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# issues with larger mailboxes. We're setting it to 1/3 of the total
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# available memory (physical mem + swap) to be sure.
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# See here for discussion:
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# - https://www.dovecot.org/list/dovecot/2012-August/137569.html
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# - https://www.dovecot.org/list/dovecot/2011-December/132455.html
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tools/editconf.py /etc/dovecot/conf.d/10-master.conf \
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default_process_limit=$(echo "`nproc` * 250" | bc) \
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default_vsz_limit=$(echo "`free -tom | tail -1 | awk '{print $2}'` / 3" | bc)M \
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log_path=/var/log/mail.log
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# The inotify `max_user_instances` default is 128, which constrains
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