I've been running 4.66 on an internal HP-UX host for quite a long time. We've recently upgraded the hardware and the OS so I figure now is also a good time to upgrade EXIM to the latest.
This is a relatively high volume host, 1000000+ msgs per day that relays mail to DMZ MX relays for internet destined email. Nominally the load on the host is about .3. When I upgraded to 4.88 the load on the host went upwards of 7 and the process that feeds EXIM started to queue up msgs in it's database and backup. I tried version 4.87 and it's performance is on par with 4.66. The feeding application forks EXIM directly and pipes the message to EXIM via standard input. I tracked the 4.88 performance degradation to calls to readconf_main in exim.c. It does appear to have undergone extensive additions/changes from 4.87->4.88. Instrumenting the code with rudimentary timing metrics I found that on average in versions 4.66-4.87 readconf_main takes < 9000 microseconds. On 4.88 it takes on average 63000 microseconds. This is a substantial increase and intolerable for our current configuration and workload. Looking at the code I doubt this is HP-UX specific. Has anyone else experienced this issue? I've not had the time to test other configurations or operating systems. If I changed from piping the message to EXIM to connecting to localhost:25 and sending the message via SMTP would that remove calls to readconf_main. I assume not since it appears EXIM re-invokes itself for delivery using the "-Mc <exim_id>" parameters. I appreciate any assistance you guys can provide, Wayne -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
