To ensure proper operation, it is important to configure enough swap space on your messaging system. The amount of required swap space will vary depending on your configuration. A general tuning recommendation is that the amount of swap space should be at least three times the amount of main memory.
An error message such as the following indicates a lack of swap space:
jbc_channels: chan_execute : fork failed: Not enough space
You might see this error in the Job Controller log file. Other swap space errors will vary depending on your configuration.
Solaris systems: swap -s (at the time MTA processes are busy), ps -elf, or tail /var/adm/messages
HP-UX systems: swapinfo or tail /var/adm/syslog/syslog.log