Commit 3919b7c1 authored by Philip Carns's avatar Philip Carns
Browse files

updated darshan-util documentation to reflect

and related functionality

git-svn-id: 3b7491f3-a168-0410-bf4b-c445ed680a29
parent 87f780b3
......@@ -83,6 +83,42 @@ An example of the output produced by can be found at
This utility is similar to, except that it produces a
separate pdf summary for every file accessed by an application. It can be
executed as follows:
---- carns_my-app_id114525_7-27-58921_19.darshan.gz output-dir
The second argument is the name of a directory (to be created) that will
contain the collection of pdf files. Note that this utility probably
is not appropriate if your application opens a large number of files.
If you would like to produce a summary for a single
specific file, then you can run the following command to produce a quick
list of the files opened by an application and the amount of time spent
performing I/O to each of them:
darshan-parser --file-list carns_my-app_id114525_7-27-58921_19.darshan.gz
Once you have identified a specific file of interest, then you can produce a
summary for that specific file with the following commands:
darshan-convert --file HASH carns_my-app_id114525_7-27-58921_19.darshan.gz interesting_file.darshan.gz interesting_file.darshan.gz
The "HASH" argument is the hash of a file name as listed in the
+darshan-parser --file-list+ output. The +interesting_file.darshan.gz+ file
produced by darshan-convert is like a normal Darshan log file, but it will only contain instrumentation for the
specified file.
=== darshan-parser
In order to obtained a full, human readable dump of all information
......@@ -344,6 +380,32 @@ total_CP_POSIX_OPENS: 230918
===== File list
Use the `--file-list` option to produce a list of files opened by the
application along with estimates of the amount of time spent accessing each
.Example output
# Per-file summary of I/O activity.
# <hash>: hash of file name
# <suffix>: last 15 characters of file name
# <type>: MPI or POSIX
# <nprocs>: number of processes that opened the file
# <slowest>: (estimated) time in seconds consumed in IO by slowest process
# <avg>: average time in seconds consumed in IO per process
# <hash> <suffix> <type> <nprocs> <slowest> <avg>
17028232952633024488 amples/boom.dat MPI 2 0.000363 0.012262
===== Detailed file list
The `--file-list-detailed` is the same as --file-list except that it
produces many columns of output containing statistics broken down by file.
This option is mainly useful for automated analysis.
=== Other command line utilities
The darshan-util package includes a number of other utilies that can be
......@@ -352,7 +414,8 @@ summarized briefly as follows:
* darshan-convert: converts an existing log file to the newest log format.
If the output file has a .bz2 extension, then it will be re-compressed in
bz2 format rather than gz format. It also has command line options for
anonymizing personal data and adding metadata annotation to the log header.
anonymizing personal data, adding metadata annotation to the log header, and
restricting the output to a specific instrumented file.
* darshan-diff: compares two darshan log files and shows counters that
* darshan-analyzer: walks an entire directory tree of Darshan log files and
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