
284 High Performance Parallel I/O
tracing of I/O operations in large-scale parallel applications, such as LANL-
Trace [3], HPCT-IO [18], IOT [17], etc. Some of the general-purpose tools can
also trace I/O information in additional to MPI calls and CPU activities, such
as FPMPI [2], Jumpshot [22, 15], TAU [20] (see Chapter 25), IPM [16] (see
Chapter 26), STAT [12], etc. Most of these tools produce a log containing the
time series of I/O operations. The logs are useful for understanding the I/O
behavior of each process. However, due to the size of the log, the overhead
of these are usually large, so they are suited for debugging jobs. Darshan
(see Chapter ...