  Many scientific applications use the X11 window environment; an open source
windows GUI standard employing a client/server architecture. X11 promotes:
distributed computing, thin-client functionality, cheap desktop displays,
compatibility with heterogeneous servers, remote services and administration,
and greater maturity than newer web technologies. This paper details the
author's investigations into close encounters with alien performance in
X11-based seismic applications running on a 200-node cluster, backed by 2 TB of
mass storage. End-users cited two significant UFOs (Unidentified Faulty
Operations) i) long application launch times and ii) poor interactive response
times. The paper is divided into three major sections describing Close
Encounters of the 1st Kind: citings of UFO experiences, the 2nd Kind: recording
evidence of a UFO, and the 3rd Kind: contact and analysis. UFOs do exist and
this investigation presents a real case study for evaluating workload analysis
and other diagnostic tools.
