Thursday Nov 13, 2008

Big News for HPC Developers: More Free Stuff

'Tis the Season. Supercomputing season, that is. Every November the HPC community--users, researchers, and vendors--attend the world's biggest conference on HPC: Supercomputing. This year SC08 is being held in Austin Texas, to which I'll be flying in a few short hours.

As part of the seasonal rituals vendors often announce new products, showcase new technologies and generally strut their stuff at the show and even before the show in some cases. Sun is no exception as you will see if you visit our booth at the show and if you take note of two announcements we made today that should be seen as a Big Deal to HPC developers. The first concerns MPI and the second our Sun Studio developer tools.

The first announcement extends Sun's support of Open MPI to Linux with the release of ClusterTools 8.1. This is huge news for anyone looking for a pre-built and extensively tested version of Open MPI for RHEL 4 or 5, SLES 9 or 10, OpenSolaris, or Solaris 10. Support contracts are available for a fee if you need one, but you can download the CT 8.1 bits here for free and use them to your heart's content, no strings attached.

Here are some of the major features supported in ClusterTools 8.1:

  • Support for Linux (RHEL 4&5, SLES 9&10), Solaris 10, OpenSolaris
  • Support for Sun Studio compilers on Solaris and Linux, plus the GNU/gcc toolchain on Linux
  • MPI profiling support with Sun Studio Analyzer (see SSX 11.2008), plus support for VampirTrace and MPI PERUSE
  • InfiniBand multi-rail support
  • Mellanox ConnectX Infiniband support
  • DTrace provider support on Solaris
  • Enhanced performance and scalability, including processor affinity support
  • Support for InfiniBand, GbE, 10GbE, and Myrinet interconnects
  • Plug-ins for Sun Grid Engine (SGE) and Portable Batch System (PBS)
  • Full MPI-2 standard compliance, including MPI I/O and one sided communication

The second event was the release of Sun Studio Express 11/08, which among other enhancements adds complete support for the new OpenMP 3.0 specification, including tasking. If you are questing for ways to extract parallelism from your code to take advantage of multicore processors, you should be looking seriously at OpenMP. And you should do it with the Sun Studio suite, our free compilers and tools which really kick butt on OpenMP performance. You can download everything--the compilers, the debugger, the performance analyzer (including new MPI performance analysis support) and other tools for free from here. Solaris 10, OpenSolaris, and Linux (RHEL 5/SuSE 10/Ubuntu 8.04/CentOS 5.1) are all supported. That includes an extremely high-quality (and free) Fortran compiler among other goodies. (Is it sad that us HPC types still get a little giddy about Fortran? What can I say...)

The full list of capabilities in this Express release are too numerous to list here, so check out this feature list or visit the wiki.

Wednesday Jul 30, 2008

Fresh Bits: Attention all OpenMP and MPI Programmers!

The latest preview release of Sun's compiler and tools suite for C, C++, and FORTRAN users is now available for free download. Called Sun Studio Express 07/08, this release of Sun Studio marks an important advance for HPC customers and for any customer interested in extracting high performance from today's multi-threaded and multi-core processors. In addition to numerous compiler performance enhancements, the release includes beta-level support for the latest OpenMP standard, OpenMP 3.0. It also includes some nice Performance Analyzer enhancements that support simple and intuitive performance analysis of MPI jobs. More detail on both of these below.

As the industry-standard approach for achieving parallel performance on multi-CPU systems, OpenMP has long been a mainstay of the HPC developer community. Version 3.0, which is supported in this new Sun Studio preview release, is a major enhancement to the standard. Most notably it includes support for tasking, a major new feature that can help programmers achieve better performance and scalability with less effort than previous approaches using nested parallelism. There are a host of other enhancements as well. The OpenMP expert will find the latest specification useful. For those new to parallelism who have stumbled into a maze of twisty passages all alike, you may find Using OpenMP: Portable Shared Memory Parallel Programming to be a useful introduction to parallelism and OpenMP.

A parallel quicksort example, written using the new OpenMP tasking feature supported in Sun Studio Express 07/08

Sun Studio Express 07/08 also includes enhancements for programmers of parallel, distributed applications who use MPI. With this release of Sun Studio Express we have introduced tighter integration with Sun's MPI library (Sun HPC ClusterTools). Sun's Performance Analyzer has been enhanced to include the ability to examine the performance of MPI jobs by viewing information related to message transfers and messaging performance using a variety of visualization methods. This extends Analyzer's already-sophisticated on-node performance analysis capabilities. Some screenshots below give some idea of the types of information that can be viewed. You should note the idea of viewing "MPI states" (e.g. MPI Wait and MPI Work) to get a high level view of the performance of the MPI portion of an application: an ability to understand how much time is spent doing actual work versus sitting in a wait state can motivate useful insights into the performance of these parallel, distributed codes.

A source code viewer window augmented with several MPI-specific capabilities, one of which is illustrated here: the ability to quickly see how much work (or waiting) is performed within a function.

In addition to supporting direct viewing of specific MPI performance issues within an application, Analyzer now also supports a range of visualization tools useful for understanding the messaging portion of an MPI code. Zoomable timelines with MPI events are supported, as is an ability to map various metrics against the X and Y axis of a plotting area to display various interesting characteristics of the MPI run, as shown below.

Just one example of Sun Studio's new MPI charting capabilities. Shown here is a display showing the volume of messages transferred between communicating pairs of MPI processes during an application run.

This blog entry has barely scratched the surface of the new OpenMP and MPI capabilities available in this release. If you are a Solaris or Linux HPC programmer, please take these new capabilities for a test drive and let us know what you think. I know the engineering teams are excited by what they've accomplished and I hope you will share their enthusiasm once you've tried these new capabilities.

Sun Studio Express 07/08 is available for Solaris 9 & 10, OpenSolaris 2008.05, and Linux (SLES 9, RHEL 4) and can be downloaded here.


Josh Simons


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