hot_domains list
Name
hot_domains list — list details of all hot domains
Synopsis
hot_domains list
Since Momentum 4.3.1.66
Description
The hot domains subsystem is intended to spread highly-trafficked domains across multiple maintainer threads. The maintainer threads are responsible for managing the mail queues for all the domains and bindings in the system.
The hot_domains list command shows how the configured hot domains are spread across the maintainer threads, along with with thread ID (Linux process ID) for each of the event loops.
09:41:21 /tmp/2025> hot_domains list Hot domain: gmail.com Event loop instance pointer: 0x7f5f6cc9a200 Thread ID (TID/PID): 36880 Hot domain: hotmail.com Event loop instance pointer: 0x7f5f6cc9a300 Thread ID (TID/PID): 36881 Hot domain: yahoo.com Event loop instance pointer: 0x7f5f6cc9a400 Thread ID (TID/PID): 36882 Hot domain: google.com Event loop instance pointer: 0x7f5f6cc9a500 Thread ID (TID/PID): 36883 Hot domain: aol.com Event loop instance pointer: 0x7f5f6cc9a600 Thread ID (TID/PID): 36884 ...
hot_domains list json is an alternative version of this command that outputs JSON.
A use-case for this command is to understand which of the maintainer event loops is using a lot of CPU. It may be that the hot domains configuration needs modifying to spread the domains out better across the maintainer event loops.
E.g.: with this configuration (from ec_console):
09:44:43 /tmp/2025> config eval maintainer_pool Maintainer_pool = "mpool" 09:44:54 /tmp/2025> config showrecurse eventloop mpool concurrency = 12
you can see the CPU usage for the maintainer threads using this command from the shell:
$ top -b -n 1 -H -p $(cat /var/run/ecelerity.pid.instance ) | sort -n | grep evt-mpool 36880 ecuser 20 0 598g 28g 260m S 3.9 31.0 895:33.75 evt-mpool 36881 ecuser 20 0 598g 28g 260m S 0.0 31.0 265:36.02 evt-mpool 36882 ecuser 20 0 598g 28g 260m S 0.0 31.0 441:03.08 evt-mpool 36883 ecuser 20 0 598g 28g 260m S 0.0 31.0 242:12.17 evt-mpool 36884 ecuser 20 0 598g 28g 260m S 3.9 31.0 371:17.59 evt-mpool 36885 ecuser 20 0 598g 28g 260m S 2.0 31.0 236:30.89 evt-mpool 36886 ecuser 20 0 598g 28g 260m S 0.0 31.0 242:02.16 evt-mpool 36887 ecuser 20 0 598g 28g 260m S 0.0 31.0 247:28.92 evt-mpool 36888 ecuser 20 0 598g 28g 260m S 0.0 31.0 236:43.63 evt-mpool 36889 ecuser 20 0 598g 28g 260m S 0.0 31.0 240:08.36 evt-mpool 36890 ecuser 20 0 598g 28g 260m S 0.0 31.0 239:55.99 evt-mpool 36891 ecuser 20 0 598g 28g 260m S 0.0 31.0 236:51.27 evt-mpool
See Also
hot_domains configuration option, maintainer_pool configuration option, hot_domains list json command