Sun Microsystems 2-Way and 4-Way AMD Opteron-based SunFire Servers Use PathScale EKOPath Compilers to Set New Performance Record

-- SPEC Benchmarks Show Sun Servers Perform up to
29 Percent Faster when Optimized by PathScale Compilers --

LinuxWorld, Boston, MA — February 15, 2005
PathScale, developer of innovative software and hardware solutions to
accelerate the performance and efficiency of Linux® clusters and developer
of the award-winning EKOPath™ Compiler Suite, has joined Sun Microsystems
in announcing the results of groundbreaking standardized performance tests.
These announcements were made this week at the LinuxWorld Conference and Expo
in Boston.

Sun tested 2-way Sun Fire V20z and 4-way Sun Fire V40z servers using
multiple SPEC benchmarks, including the SPEC® ompM2001 suite of
OpenMP® benchmarks. The PathScale EKOPath Compiler Suite helped Sun's
AMD® Opteron® processor-based servers set world records for SPEC
ompM2001 on two-processor and four-processor systems. The Sun/PathScale
two-processor results were 29 percent faster (footnote 1) than previous-best
Linux ompM2001 benchmarks using non-PathScale Fortran and C compilers. This 29
percent advantage, enabled in large part by PathScale compilers, far exceeds
the eight percent faster clock rate of the newer Sun systems. The
Sun/PathScale four-processor SPEC ompM2001 result surpasses the best
four-processor benchmarks on Intel Itanium 2, Power5 and Alpha processors as
well as previous SPEC results on four-processor Opteron systems.

In addition, using the SPEC® CPU2000 benchmark, the Sun Fire V40z
server equipped with the PathScale EKOPath Compiler Suite achieved two new
world records for 4-way x86 systems on integer and floating point performance
(footnote 2). The V20z server achieved a new x86 world record score on
floating point intensive SPECfp2000 performance, as well as the best 2-way x86
result on floating point performance. The PathScale-optimized Sun servers
showed improved scalability and higher performance for both floating point and
integer performance, with up to 25 percent improvement when compared with
previous benchmarks.

"Sun's choice of the PathScale EKOPath compilers over all other
compiler alternatives is a testimony to the clear performance advantages of
PathScale compilers and our new OpenMP 2.0 implementation," explained Art
Goldberg, COO of PathScale. "We have made some major improvements in the
EKOPath 2.0 release to optimize performance of multi-processor nodes and have
also worked closely with AMD to support their upcoming dual-core processor
release. OpenMP performance is critical to efficient use of these types of
systems and the Sun benchmark results underscore the quality of the EKOPath
implementation."

EKOPath Compiler Suite Availability

The latest version of the PathScale EKOPath Compiler Suite is available
through leading Linux cluster solution providers in North America, Europe and
Asia participating in the PathScale FastPath™ reseller program described at http://www.pathscale.com/authorized_resellers.php. A 30-day free trial
is available to new compiler customers at http://www.pathscale.com/trial.php.

PathScale's Additional Paths to Scalability

In addition to EKOPath, the world's fastest 64-bit compiler suite for Linux
clusters, PathScale delivers a number of other software and hardware products
to improve the scalability and performance of applications residing on Linux
clusters. These include the PathScale InfiniPath™ HTX Adapter, the
industry's lowest latency Linux cluster interconnect for MPI applications, and
the OptiPath™ MPI Acceleration Tools, the industry's first user-friendly
root cause analysis tools for optimizing MPI applications. Customers can
register for early access to InfiniPath and OptiPath by visiting http://www.pathscale.com/earlyaccess.php.

LinuxWorld Conference and Expo

The PathScale EKOPath Compiler Suite is being exhibited in the AMD booth at
LinuxWorld in Boston from February 15 through 17, 2005 at the Hynes Convention
Center.

About PathScale

Based in Mountain View, California, PathScale develops innovative software and
hardware technologies that substantially increase the performance and
efficiency of Linux clusters, the next significant wave in high-end computing.
Applications that benefit from PathScale's technologies include seismic
processing, complex physical modeling, EDA simulation, molecular modeling,
biosciences, econometric modeling, computational chemistry, computational
fluid dynamics, finite element analysis, weather modeling, resource
optimization, decision support and data mining. PathScale's investors include
Adams Street Partners, Charles River Ventures, Enterprise Partners Venture
Capital, CMEA Ventures, ChevronTexaco Technology Ventures and the Dow
Employees Pension Plan. For more details, visit http://www.pathscale.com, send email to sales@pathscale.com or telephone
1-650-934-8100.

(1) About the SPEC OMPM2001 Results Reported Above:

Two-Processor Results: The Sun V40z server with PathScale EKOPath
Compiler Suite and 2.6 GHz AMD Opteron CPUs achieved a result of 6486 on a
system with two cores, two chips and two threads. This comparison is based on
the best performing two-processor servers currently shipping by IBM
[SPECompM2001 5526, two cores, one chip, four threads] and Suns previous
results with competitor's compiler on a 2.4 GHz Java Workstation W2100z system
[SPECompM2001 5085, two cores, two chips, two threads].

Four-Processor Results: The Sun V40z server with PathScale EKOPath
Compiler Suite and 2.6 GHz AMD Opteron CPUs achieved a result of 11223 on a
system with four cores, four chips and four threads. This comparison is based
on the best performing four-processor servers currently shipping by IBM
[SPECompM2001 10522, four cores, two chips, eight threads], HP with Alpha CPUs
[SPECompM2001 6946, four cores, four chips, four threads], HP with Intel
Itanium two CPUs [SPECompM2001 6886, four cores, four chips, four threads],
and Sun V40z previous results on a 2.4 GHz system with a non-PathScale
compiler [SPECompM2001 8694, four cores, four chips, four threads].

(2) About the SPEC CPU2000 Results Reported Above:

The Sun Fire V20z server (2xAMD Opteron processor Model 252, SLES9) with
PathScale EKOPath Compiler Suite: SPECfp2000 -- 2036, SPECint_rate2000 --
40.4, SPECfp_rate2000 -- 46.5. The Sun Fire V40z server with PathScale
EKOPath Compiler Suite (4xAMD Opteron processor Model 852, SLES9):
SPECint_rate2000 76.7, SPECfp_rate2000 -- 87.1. The Sun Fire V20z server
(2xAMD Opteron processor Model 250, SLES8): SPECfp_rate2000 37.2. IBM eServer
OpenPower 710 (2x1.65 GHz Power5, Linux): SPECfp_rate -- 40.2. IBM eServer p5
510 (2x1.65 GHz Power5, AIX): SPECint_rate2000 -- 33, SPECfp_rate2000 --
43.2. The IBM results can be found at: http://www.marketwire.com/mw/release_html_b1?release_id=80529.

(3) The SPEC OMP and CPU2000 comparisons above are based on Suns results
submitted to SPEC for review and results published at www.spec.org as of
February 14, 2005. For the latest SPEC benchmark results, visit http://www.spec.org/.

(4) PathScale, EKOPath, InfiniPath, OptiPath and FastPath are trademarks
of PathScale, Inc. SPEC, SPECompM2001, SPECCPU2000 and SPECfp2000 are
trademarks of the Standard Performance Evaluation Corporation. OpenMP is a
trademark of the OpenMP Architecture Review Board. AMD and Opteron are
trademarks of Advanced Micro Devices. Sun, Sun Microsystems and Sun Fire are
trademarks of Sun Microsystems. Linux is a trademark of Linus Torvalds. All
other trademarks and company names mentioned herein are the property of their
respective owners.

Company Contact:
Len Rosenthal, VP Marketing
PathScale, Inc.
lrosenthal@pathscale.com
1-650-934-8090

Media Contact:
David Wright
MediaBridge Public Relations®
dwright@mbipr.com
1-408-363-2843

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