Commit 68b374d9 authored by Shane Snyder's avatar Shane Snyder

add some DxT perf results from Cong to docs

parent a9d76551
...@@ -26,11 +26,13 @@ files on Lustre file systems, and a module for instrumenting stdio (i.e., stream ...@@ -26,11 +26,13 @@ files on Lustre file systems, and a module for instrumenting stdio (i.e., stream
functions like `fopen()`, `fread()`, etc). functions like `fopen()`, `fread()`, etc).
Starting in version 3.1.3, Darshan also allows for full tracing of application I/O Starting in version 3.1.3, Darshan also allows for full tracing of application I/O
workloads using the newly developed Darshan eXtended Tracing (DXT) instrumentation workloads using the newly developed Darshan eXtended Tracing (DxT) instrumentation
module. This module can be selectively enabled at runtime to provide high-fidelity module. This module can be selectively enabled at runtime to provide high-fidelity
traces of an application's I/O workload, as opposed to the coarse-grained I/O summary traces of an application's I/O workload, as opposed to the coarse-grained I/O summary
data that Darshan has traditionally provided. Currently, DXT only traces at the POSIX data that Darshan has traditionally provided. Currently, DxT only traces at the POSIX
and MPI-IO layers. and MPI-IO layers. Initial link:DXT-overhead.pdf[performance results] demonstrate the
low overhead of DxT tracing, offering comparable performance to Darshan's traditional
coarse-grained instrumentation methods.
This document provides generic installation instructions, but "recipes" for This document provides generic installation instructions, but "recipes" for
several common HPC systems are provided at the end of the document as well. several common HPC systems are provided at the end of the document as well.
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