Changes between Version 14 and Version 15 of Public/User_Guide/Offloading_hybrid_apps

Timestamp:

Sep 17, 2019, 5:26:14 PM (5 years ago)

Author:

Kevin Sala

Comment:

—

Public/User_Guide/Offloading_hybrid_apps

@@ -1 @@
-= '''Offloading Computational Tasks of Hybrid MPI + OpenMP/OmpSs-2 Applications to GPUs''' =
+= Offloading Computation Tasks of Hybrid Applications to GPUs =
+  With '''MPI''' + '''OpenMP''' / '''!OmpSs-2'''
 
 Table of contents:
 
 * [#QuickOverview Quick Overview]
-* Examples:
-  * [#N-BodyBenchmark N-Body Benchmark]
+* [#N-BodyBenchmark N-Body Benchmark]
 * [#References References]
 
-----
-
 == Quick Overview ==
+
+Current and near-future High Performance Computing (HPC) systems consists of
+thousands of parallel computing nodes, connected by high-bandwidth network
+interconnections, and in most of the cases, each node leveraging one or more
+GPU devices.
+
+Moreover, some of the most modern GPU devices, such as NVIDIA Tesla V100,
+support the Unified Memory which facilitates the task of the users. With those
+devices, users do not have to move or copy the data to/from the GPU, and also,
+pointers at the host are the same at the device.
+
+For these reasons, parallel applications should try to take benefit from these
+GPU resources, and they should try to offload the most compute-intensive parts
+of the applications to the available GPUs. In this page, we are going to briefly
+explain the approaches proposed by the OpenMP and the !OmpSs-2 programming models
+to facilitate the offloading of computation tasks to the Unified Memory GPUs. Then,
+we show an hybrid MPI + OpenMP/OmpSs-2 benchmark that offloads some tasks, and that
+we can execute on the DEEP system.
 
 == N-Body Benchmark ==
@@ -25 +41 @@
 gravitational force.
 
-N-body simulation arises in many other computational science problems as well.
+N-Body simulation arises in many other computational science problems as well.
 For example, protein folding is studied using N-body simulation to calculate
 electrostatic and ''Van der Waals'' forces. Turbulent fluid flow simulation and