Hi,
Make sure you have enough memory for performance testing.
Here are some quick memory fixes.
Edit the vmoptions file in SoapUI Pro installation folder\bin to accommodate following changes,
Set Xms128m and -Xmx to 4000 if your ram is 4GB or 8000 if its 8GB
Also if you receive the perm gen space error add -XX:MaxPermSize=128m.
For more information on the link,
http://www.soapui.org/Working-with-soap ... usage.htmlAlso check the load test strategies,
http://www.soapui.org/Load-Testing/simu ... -load.htmlFrom what I understood you will require 1000 threads, I would suggest simple or fixed load strategy.
Thanks,
Jeshtha