I have the same problem. my memory is restricted to 64MB, its wildfire 3.1.1 on CentoOS 4. i have created a vmoptions file in /opt/wildfire/bin/ as
JVM Version and Vendor: 1.5.0_08 Sun Microsystems Inc. – Java HotSpot™ Server VM
OS / Hardware: Linux / i386
Locale / Timezone: en / India Standard Time (5 GMT)
Java Memory 61.41 MB of 63.31 MB (97.0%) used
and kicks all the users. please help me what to do.