Very Computer

1. plenty of swap space, but keep receiving error "swap space limit exceeded"

Syslog reports
  unix: WARNING: /tmp: File system full, swap space limit exceeded

But

  Filesystem            kbytes    used   avail capacity  Mounted on
  swap                 2423720   48480 2375240     3%    /tmp

The host:
  SunOS <hostname> 5.7 Generic_106541-16 sun4u sparc SUNW,Ultra-60

I ran vmstat 1 for some time and watched for available swap space to
go to zero. But the lowest it would go is 75kB.

When analyzing this problem, I ran into the following error twice, but
for different commands:
  Can't run command <command>
  fork(2) failed; no more memory

What's going on?

Thanks.

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