The mpich distribution contains several programs for visualizing log files produced by mpich applications or the mpich library itself. The oldest included in mpich is called upshot, which is a pure tcl/tk application*. Its successor is called nupshot, which is faster in displaying the output of large log files since part of it is written in C. A new program, usable but still under development, is a Java version of upshot, which we call jumpshot. Upshot and nupshot use an ASCII log file format we call alog. Jumpshot uses a new, binary format called CLOG. Mpich produces CLOG files by default; to get ALOG files set the environment variable MPE_LOG_FORMAT to ALOG. A new, scalable logfile format called SLOG is also supported by mpich. Only the program jumpshot can view SLOG files.