Commit f5927342 authored by Matthieu Dorier's avatar Matthieu Dorier
Browse files

Merge branch 'master' of

parents 75442b28 d86b07cb
......@@ -9,13 +9,14 @@ Please see the
[Darshan web page](
for more in-depth news and documentation about Darshan.
Darshan-Ruby is designed to support Darshan 3.0.0 and above.
Darshan-Ruby versions x.y.z.v are designed to support Darshan versions x.y.z
(for instance Darshan-Ruby version 3.1.1.x support Darshan 3.1.1).
This source is not necessary to install Darshan-Ruby, as
Darshan-Ruby is available as a ruby gem on
The source present on this repository is not necessary to install Darshan-Ruby,
as Darshan-Ruby is available as a ruby gem on [](
......@@ -24,7 +25,114 @@ Darshan must be installed with bzip2 support, and with the --enable-shared
build option. Assuming the path to Darshan is "path/to/darshan", install
Darshan-Ruby can be done as follows:
> gem install darshan-ruby -- --with-darshan-dir=path/to/darshan
gem install darshan-ruby -- --with-darshan-dir=path/to/darshan
If you use [RVM]( to manage your packages:
rvm gemset create darshan
rvm gemset use darshan
gem install darshan-ruby -- --with-darshan-dir=path/to/darshan
Starting from version, Darshan-Ruby comes with the **Quarshan** tool.
Quarshan is a command-line tool to query darshan files.
Once Darshan-Ruby is installed, you can call Quarshan as follows:
quarshan -o COUNTER file.darshan
For example:
quarshan -o POSIX_BYTES_WRITTEN ior1.darshan
Will output
/home/shane/software/darshan/testFile.00000000 1048576
/home/shane/software/darshan/testFile.00000001 1048576
/home/shane/software/darshan/testFile.00000002 1048576
/home/shane/software/darshan/testFile.00000003 1048576
#### Displaying a header
You can obtain a header using the **-v** (or **--verbose**) option:
> quarshan -o POSIX_BYTES_WRITTEN ior1.darshan -v
/home/shane/software/darshan/testFile.00000000 1048576
/home/shane/software/darshan/testFile.00000001 1048576
/home/shane/software/darshan/testFile.00000002 1048576
/home/shane/software/darshan/testFile.00000003 1048576
#### Working with multiple counters
You can ask for multiple counters by separating them by commas (without spaces).
These counters must all be part of the same module (here POSIX, for example):
> quarshan -o POSIX_BYTES_WRITTEN,POSIX_SIZE_WRITE_100K_1M ior1.darshan -v
/home/shane/software/darshan/testFile.00000000 1048576 4
/home/shane/software/darshan/testFile.00000001 1048576 4
/home/shane/software/darshan/testFile.00000002 1048576 4
/home/shane/software/darshan/testFile.00000003 1048576 4
#### Computing statistics automatically
You can provide reduction operations to directly compute statistics
using **-r** (or **--reductions**):
> quarshan -o POSIX_BYTES_WRITTEN,POSIX_SIZE_WRITE_100K_1M -r avg,min ior1.darshan -v
4 1048576.0 4
Instead of printing the name of the record on the first column, the number of
records will be printed.
Available reduction operators are: min (minimum), max (maximum), avg (average)
var (variance), std (standard deviation), med (median), sum (sum).
When providing reduction operations, if you provide only one reduction
operation, it will be applied to all requested counters. If you provide multiple
reduction operations, you must make sure to provide the same number as the number
of counters.
#### Conditionally selecting records
You can select only records that satisfy a particular condition using
*-s* (or *--select*).
For example to consider only records for which POSIX_F_META_TIME > 5.0e-5, use
and display the POSIX_BYTES_WRITTEN counter for them, use:
> quarshan -o POSIX_BYTES_WRITTEN ior1.darshan -v -s "POSIX_F_META_TIME > 5.0e-5"
/home/shane/software/darshan/testFile.00000001 1048576
/home/shane/software/darshan/testFile.00000002 1048576
/home/shane/software/darshan/testFile.00000003 1048576
Selection operations include all valid Ruby arithmetic and boolean operators.
Note that the counters used in the selection query must be part of the same module
as the counters requested for display.
Note also that the query must be in between double-quotes.
You can of course mix selection queries with reduction operators!
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