There seems to be no information on this program anywhere, so for anyone who gets a problem with it. Here's the answer from IBM.

"db2pgixt.e xe is DB2 calls to interface with the user exit program, which performs archive log/ backup."

In my case it was using 100% of cpu as I was archiving logs to TSM and TSM was not available. As soon as TSM came back up, the problem went away.

I hope this helps...