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The 131072 byte lower bound was the old default before the
sliding mmap window was introduced in modern glibc malloc.
While the sliding mmap window was intended to be faster by
reducing syscalls, zeroing and kernel overhead, it is also prone
to fragmentation from allocation patterns seen in evented Perl
servers.
Individual allocations over 128K are rare in our codebase since
there aren't many messages this large, making any performance
impact tiny. Furthermore, the reduction in fragmentation and
memory use will be a speedup for memory-constrained systems
since they can avoid swap and have more leftover for the page
cache.
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systemd complains about `User=nobody' since `nobody' has access
to all files which can't be mapped to a valid UID. We'll also
switch to `Group=ssl-cert' since that ought to be able to read
TLS certificates.
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systemd (247.3-7+deb11u1 on Debian 11.x) considers them "obsolete" and
emits the following to my syslog:
Standard output type syslog is obsolete, automatically updating to journal.
Please update your unit file, and consider removing the setting altogether.
So we'll remove it altogether, as I'm sticking with rsyslog for now.
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It's important show that a single systemd service and socket file
can replace all other read-only daemons for ease-of-management.
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systemd.socket(5) files can actually contain multiple listen
sockets, so shave down inode overhead and simplify config
file management by consolidating all applicable ports into
a single file for each daemon.
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We've got examples for all the other daemons, too!
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