I’m afraid we’re a little out of sync between the documentation and the code, depending on which code you’re running.
-U was changed some time ago to mean the number of dispatchers to use for outgoing queries, not listeners to use for incoming queries. Post 9.18 it won’t do anything at all, so best to ignore it. We will document this properly! -n sets the number of event loops. You can tweak this manually if you find that the autodetected value is not suitable for your environment and usage. I hope that helps. Greg > On 10 Jul 2024, at 15:43, Thomas Hungenberg via bind-users > <bind-users@lists.isc.org> wrote: > > On 10.07.24 14:20, Tom Marcoen (EXT) wrote: >> My server has four (virtual; it runs on vSphere) CPUs and also shows four >> lines in `ss` output. >> The `ps` command shows the `-U` which - I assume - is set automatically >> triggered by the number of CPUs. >> # ps -elf | grep named >> 5 S named 23769 1 9 80 0 - 251941 do_sig 07:12 ? 00:39:02 >> /usr/local/sbin/named -U4 -u named -c /usr/local/etc/namedb/named.conf > > The manpage says: > > -U #listeners > This option tells named the number of #listeners worker threads > to listen on, for incoming UDP packets on each address. If not > specified, named calculates a default value based on the number > of detected CPUs: 1 for 1 CPU, and the number of detected CPUs > minus one for machines with more than 1 CPU. > > > So if not specified, the value of "-U" should be set to 3 with four CPUs. > Also, the parameter "-U" usually does not show up in the ps output if not > specified. > > So in your case it looks more like named is specifically started with "-U4"? > > > - Thomas > > -- > Visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from > this list > > ISC funds the development of this software with paid support subscriptions. > Contact us at https://www.isc.org/contact/ for more information. > > > bind-users mailing list > bind-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/bind-users -- Visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
