exim high load and dozens of processes

This server was experiencing loads of up to 80 and maxing out the RAM and kmemsize on a CPanel VPS.  There were literally dozens if not hundreds of exim processes.  I have no idea why exim has such a design that would allow it to consume this much CPU and RAM.  Any normal MTA should not be spawning so many processes, it should be processing them in sequence and if it is going to spawn hundreds of processes in response to a large volume of mail, it's better to have a delayed delivery than a crash etc..

The following settings in exim.conf are what fixed it (and should be the default to avoid a DOS effect), I never observed more than two exim proceses or a load about 1.57 after setting that and restarting Exim.

The true culprit of the high load were thousands of e-mails being sent without a recipient/to field from a form based contact script though.

Solution Fix is to set the following in exim.conf and restart

deliver_queue_load_max = 3
queue_only = true
queue_only_load = 3
queue_run_in_order = true



exim, dozens, processesthis, server, experiencing, loads, maxing, ram, kmemsize, cpanel, vps, processes, consume, cpu, mta, spawning, processing, sequence, spawn, volume, delayed, etc, settings, conf, default, dos, observed, proceses, restarting, culprit, mails, recipient, restart, deliver_queue_load_max, queue_only, queue_only_load, queue_run_in_order,

Latest Articles

  • Proxmox How To Custom Partition During Install
  • Hyper-V Linux VM Boots to Black Screen, Storage, NIC Not Found Issues
  • Ubuntu Mint How to Fix Missing/Broken /dev and /dev/pts which causes terminal to immediately close exit and not work
  • How high can a Xeon CPU get?
  • bash fix PATH environment variable "command not found" solution
  • Ubuntu Linux Mint Debian Redhat Youtube Cannot Play HD or 4K videos, dropped frames or high CPU usage with Nvidia or AMD Driver
  • hostapd example configuration for high speed AC on 5GHz using WPA2
  • hostapd how to enable and use WPS to connect wireless devices like printers
  • Dell Server Workstation iDRAC Dead after Firmware Update Solution R720, R320, R730
  • Cloned VM/Server/Computer in Linux won't boot and goes to initramfs busybox Solution
  • How To Add Windows 7 8 10 11 to GRUB Boot List Dual Booting
  • How to configure OpenDKIM on Linux with Postfix and setup bind zonefile
  • Debian Ubuntu 10/11/12 Linux how to get tftpd-hpa server setup tutorial
  • efibootmgr: option requires an argument -- 'd' efibootmgr version 15 grub-install.real: error: efibootmgr failed to register the boot entry: Operation not permitted.
  • Apache Error Won't start SSL Cert Issue Solution Unable to configure verify locations for client authentication SSL Library Error: 151441510 error:0906D066:PEM routines:PEM_read_bio:bad end line SSL Library Error: 185090057 error:0B084009:x509 certif
  • Linux Debian Mint Ubuntu Bridge br0 gets random IP
  • redis requirements
  • How to kill a docker swarm
  • docker swarm silly issues
  • isc-dhcp-server dhcpd how to get longer lease