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(c) 2007-2011 The Board of Trustees of the University of Illinois.

This software is distributed under the Illinois Open Source License agreement.
The LICENSE file contains a copy of the license agreement.


Introduction
------------

The Parboil suite was developed from a collection of benchmarks used at the
University of Illinois to measure and compare the performance of
computation-intensive algorithms executing on either a CPU or a GPU.  Each 
implementation of a GPU algorithm is either in CUDA or OpenCL, and requires 
a system capable of executing applications using those APIs.  


Quick setup guide
-----------------

To use the parboil benchmark suite:

Create a 'benchmarks' subdirectory (you can also use a symbolic link) and put
benchmarks in it.  There should be one subdirectory for each benchmark.  We
distribute some benchmarks as a separate archive file.  See the 
README.benchmarks file for information about the expected format of each 
benchmark directory.

Create a 'datasets' subdirectory (you can also use a symbolic link) and put
datasets in it.  There should be one subdirectory for each benchmark.  We
distribute some datasets as a separate archive file.

There are a number of files that may not be automatically marked executable
after unpacking.  Ensure that they are executable by running 'chmod u+x'
with the filename as its argument.  If your shell is bash, the following
will work:

  chmod u+x ./parboil
  chmod u+x benchmarks/*/tools/compare-output

Create a Makefile.conf file in parboil/common to set a few system-specific 
paths.  You can use some of the examples in that directory as a place to start.

Type './parboil help' to display the driver commands.  You can get help on
a particular comand X with './parboil help X'.

Run './parboil' with options to do stuff.


Running a benchmark
-------------------

You can see a list of benchmarks, and the available versions of each
benchmark, with the command

  ./parboil list

Suppose you want to compile and run the CUDA version of the benchmark
"cutcp".  Then the following commands will do this:

  ./parboil compile cutcp cuda
  ./parboil run     cutcp cuda default

Timing information is recorded with a combination of standard system timers 
and CUDA API event timers.  Each benchmark should display timer values 
following this format:

IO:	 (seconds spent interacting with the file system)
Kernel:	 (seconds spent doing device computation, measured asynchronously)
Copy:	 (seconds CPU spent synchronously copying data to/from the device memory)
Driver:	 (seconds of CPU time spent sending commands to the device driver)
Compute: (seconds of CPU time spent in computation)
Copy Async:	 (seconds duration of asynchronous copies to/from the device memory)
CPU/Kernel Overlap: (seconds double-counted by asynchronous and CPU timers)

The driver prints "Pass" if the benchmark's output appears to be correct (i.e. 
  the compare-output script has an exit code of zero)

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