PGI

Category: Program Dev-Compilers

Description

Cray provides the Portland Group (PGI) compilers as part of several programming environments. PGI versions 9.0.x, 8.0.x and 7.2.x are available.

XTs have two kinds of nodes:

  1. Compute nodes running the CNL OS.
  2. Service and login nodes running Linux.

The Cray wrappers cc, CC, and ftn will automatically link against MPI (-lmpi) and SciLib (-lsci). This is not true when calling the PGI compilers directly. See the cc, CC, and ftn man pages for more information on their usage.

To see man pages on PGI compilers with a full list of compiler options, first make sure the "PrgEnv-pgi" module is loaded, and then do a man on any of the following:

For more detailed information, see PGI documentation and Cray's documentation.

Use

To use the Cray wrappers with the PGI compilers, the PrgEnv-pgi module should be loaded:

  module avail PrgEnv
  module swap PrgEnv-pgi PrgEnv-pgi        # this loads some version of pgi, currently 7.2.3
To just use the PGI compilers directly, just load the pgi module you want:
  module avail pgi
  module load pgi/7.2.3         # Note that this does not changed the Cray wrappers.
It is possible to use the PGI compiler versions directly without loading the Cray Programming Environments, but note that the Cray wrappers will probably not work as expected if you do that.

Also note that with CNL 2.0.49 and above, the following options are set automatically by the xtpe-quadcore module (loaded by default):

jaguar12> module display xtpe-quadcore
-------------------------------------------------------------------
/opt/xt-asyncpe/1.0/modulefiles/xtpe-quadcore:

prepend-path     PE_PRODUCT_LIST XTPE_QUADCORE 
setenv           XTPE_QUADCORE_ENABLED ON 
setenv           LIBSCI_PRE_LINK_OPTS  -lsci_quadcore  
setenv           PGI_POST_COMPILE_OPTS   -tp barcelona-64 
setenv           PATHSCALE_POST_COMPILE_OPTS  -march=barcelona 
setenv           GNU_POST_COMPILE_OPTS  -march=barcelona 
setenv           LLVM_AMD_10H 1 
-------------------------------------------------------------------

However, the "barcelona" option works with many versions of the compiler.
Versionbarcelona support
7.2.xyes

It is best to review the pgcc, pgCC, and pgf90 man pages for a list of their options.

C/C++ Options

The following options control the amount of debugging information generated by the compiler. They can adversely affect optimization.
Option Description
-g Generates symbolic debug information. Turns off optimization.
-MboundsAdds array bound checking.

For most cases, the usual levels of optimization are appropriate (-O0, -O1, -O2 [default], -O3). Here are a few exceptions.
Option Description
-fastChooses generally optimal flags for the target platform. Use pgcc -fast -help to see the equivalent switches. Note this sets the optimization level to a minimum of 2; see -O.
-fastsseChooses generally optimal flags for a processor that supports the streaming SIMD extensions (SSE) (Pentium 3/4, AthlonXP/MP, Opteron) and SSE2 (Pentium 4, Opteron) instructions. Use pgcc -fastsse -help to see the equivalent switches.
-tp barcelona-64Targets optimization to the 64-bit Opteron quad-core processor.
-MflushzSets SSE to flush-to-zero mode.
-pg, -MprofInstrument program for profiling. These flags imply different types of profiling. Please check the performance tuning pages for more information.
-MinfoGenerates an optimization report to standard error. This has several suboptions, so check the man page.
-mp=nonumaEnables the compiler to generate multithreaded code based on the OpenMP directives. Use the nonuma suboption when linking with the Cray wrappers.

Fortran Options

The following options control how source files are translated into machine code.
Option Description
-M fixedThe source code uses fixed-form syntax, as in Fortran 77. This option is on by default for source files ending in .f, .F, .for, and .fpp.
-M freeThe source code uses free-form syntax, introduced in Fortran 90. This option is on by default for source files ending in .f90, .F90, .f95, .F95.
-FThis option preprocesses each file and leaves the output in a file named file.f for each file named file.F.
-i8This option treats INTEGER variables as 8 bytes. For operations involving integers, uses 64 bits for computations.
-r8This option interprets REAL variables as DOUBLE PRECISION. Equivalent to using the options -Mr8 and -Mr8intrinsics.

The following options control the amount of debugging information generated by the compiler. They can adversely affect optimization.
Option Description
-gGenerates symbolic debugging information. Turns off optimization.
-MboundsAdds array bound checking.
-MchkptrChecks for unintended dereferencing of null pointers.

For most cases, the usual levels of optimization are appropriate (-O0, -O1, -O2 [default], -O3). Here are a few exceptions.
Option Description
-fastChooses generally optimal flags for the target platform. Use pgf90 -fast -help to see the equivalent switches. Note this sets the optimization level to a minimum of 2; see -O.
-fastsseChooses generally optimal flags for a processor that supports the SSE (Pentium 3/4, AthlonXP/MP, Opteron) and SSE2 (Pentium 4, Opteron) instructions. Use pgf90 -fastsse -help to see the equivalent switches.
-MflushzSets SSE to flush-to-zero mode.
-pg, -MprofInstrument program for profiling. These flags imply different types of profiling. Please check the performance tuning pages for more information.
-MinfoGenerates an optimization report to standard error. This has several suboptions, so check the man page.
-MlistGenerates a listing file.
-mp=nonumaEnables the compiler to generate multithreaded code based on the OpenMP directives. Use the nonuma suboption when linking with the Cray wrappers.

Support

This package has the following support level : Supported

Available Versions

All versions of this software are provided by the system vendor and are not installed by NICS staff.