Development/Intel Compiler

Description	Content
module load	compiler/intel
Availability	bwUniCluster | BwForCluster_Chemistry
License	Commercial. See $INTEL_HOME/install-doc/EULA.txt. | Intel Product Licensig FAQ
Citing	n/a
Links	Intel C-Compiler Homepage
Graphical Interface	Yes (Intel Debugger GUI-Verison)
Included modules	icc | icpc | ifort | idb

Introduction

The Intel Compiler of the Intel Composer XE Suite consists of tools to compile and debug C, C++ and Fortran programs:

icc	Intel C compiler
icpc	Intel C++ compiler
ifort	Intel Fortran compiler
idb	Intel debugger in GUI mode
idbc	Intel debugger in console mode

Aside from that the suite also includes the TBB (Threading Building Blocks) and IPP (Integrated Performance Primitives) libraries.

Versions and Availability

A list of versions currently available on all bwHPC-C5-Clusters can be obtained from the

Cluster Information System CIS

{{#widget:Iframe |url=https://cis-hpc.uni-konstanz.de/prod.cis/bwUniCluster/compiler/intel |width=99% |height=480 }} On the command line interface of any bwHPC cluster you'll get a list of available versions by using the command 'module avail compiler/intel'.

$ : bwUniCluster
$ module avail compiler/intel
------------------------ /opt/bwhpc/common/modulefiles -------------------------
compiler/intel/12.1          compiler/intel/14.0
compiler/intel/13.1          compiler/intel/15.0(default)

Loading the module

Default Version

You can load the default version of the Intel Compiler with the command 'module load compiler/intel'.

$ module avail compiler/intel
------------------------ /opt/bwhpc/common/modulefiles -------------------------
compiler/intel/12.1          compiler/intel/14.0
compiler/intel/13.1          compiler/intel/15.0(default)
$ module load compiler/intel
$ module list
Currently Loaded Modulefiles:
  1) compiler/intel/15.0(default)

Here, we got the "default" version 15.0 (example).
The module will try to load modules it needs to function. If loading the module fails, check if you have already loaded the module with 'module list'.

Specific (newer or older) Version

If you wish to load a specific (older or newer) version (if available), you can do so using e.g. 'module load compiler/intel/version' to load the version you desires.

$ module avail compiler/intel
------------------------ /opt/bwhpc/common/modulefiles -------------------------
compiler/intel/12.1          compiler/intel/14.0
compiler/intel/13.1          compiler/intel/15.0(default)
$ module load compiler/intel/14.0
$ module list
Currently Loaded Modulefiles:
  1) compiler/intel/14.0

Intel C-Compiler "version 14.0" is loaded now (example).

Intel C-Compiler-Specific Environments

To see a list of all Intel C-Compiler environments set by the 'module load'-command use 'env | grep INTEL'.
Or use the command 'module show compiler/intel'.
Example (excerpt, default version)

$ module show compiler/intel  # output is revised
-------------------------------------------------------------------
/opt/bwhpc/common/modulefiles/compiler/intel/15.0:
[...]
INTEL_VERSION = 15.0.3 
INTEL_HOME = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187 
INTEL_BIN_DIR = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/bin/intel64 
INTEL_LIB_DIR = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/compiler/lib/intel64 
INTEL_LIB_MIC = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/compiler/lib/mic 
INTEL_LIB_MICMPI = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/mpirt/lib/mic 
INTEL_INC_DIR = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/compiler/include 
INTEL_MAN_DIR = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/man/en_US 
INTEL_DOC_DIR = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/Documentation/en_US 
GDB_VERSION = 15.0.3 
GDB_HOME = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/debugger/gdb/intel64 
GDB_BIN_DIR = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/debugger/gdb/intel64/bin 
GDB_LIB_DIR = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/debugger/libipt/intel64/lib 
GDB_INC_DIR = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/debugger/gdb/intel64/include 
GDB_INF_DIR = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/debugger/gdb/intel64/share/info 
GDB_MAN_DIR = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/debugger/gdb/intel64/share/man 
ICC_VERSION = 15.0.3 
ICC_HOME = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187 
ICC_BIN_DIR = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/bin/intel64 
ICC_LIB_DIR = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/compiler/lib/intel64 
ICC_INC_DIR = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/compiler/include 
ICC_MAN_DIR = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/man/en_US 
ICC_DOC_DIR = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/Documentation/en_US 
IFORT_VERSION = 15.0.3 
IFORT_HOME = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187 
IFORT_BIN_DIR = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/bin/intel64 
IFORT_LIB_DIR = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/compiler/lib/intel64 
IFORT_INC_DIR = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/compiler/include 
IFORT_MAN_DIR = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/man/en_US 
IFORT_DOC_DIR = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/Documentation/en_US 
LANGUAGE_TERRITORY = en_US 
PATH = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/bin/intel64:$PATH
LD_LIBRARY_PATH = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187:$LD_LIBRARY_PATH/composer_xe_2015.3.187/compiler/lib/intel64 
LD_RUN_PATH = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/compiler/lib/intel64:$LD_RUN_PATH
MIC_LD_LIBRARY_PATH = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/mpirt/lib/mic:$MIC_LD_LIBRARY_PATH
MIC_LD_LIBRARY_PATH = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/compiler/lib/mic:$MIC_LD_LIBRARY_PATH 
MIC_LIBRARY_PATH = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/mpirt/lib/mic:$MIC_LIBRARY_PATH
MIC_LIBRARY_PATH = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/compiler/lib/mic:$MIC_LIBRARY_PATH
LIBRARY_PATH = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/compiler/lib/intel64:$LIBRARY_PATH
MANPATH = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/man/en_US:$MANPATH
NLSPATH = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/compiler/lib/intel64/locale/%l_%t/%N:$NLSPATH
INTEL_PYTHONHOME = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/debugger/python/intel64:$INTEL_PYTHONHOME
PATH = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/debugger/gdb/intel64/bin:$PATH
LD_LIBRARY_PATH = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/debugger/libipt/intel64/lib:$LD_LIBRARY_PATH
MANPATH = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/debugger/gdb/intel64/share/man:$MANPATH
INFOPATH = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/debugger/gdb/intel64/share/info:$INFOPATH
NLSPATH = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/debugger/gdb/intel64/share/locale/%l_%t/%N:$NLSPATH
INTEL_LICENSE_FILE = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/composer_xe_2015.3.187/licenses
CC = icc 
CXX = icpc 
F77 = ifort 
FC = ifort 
F90 = ifort 
TEST_MODULE_SCRIPT = /opt/bwhpc/common/compiler/intel/compxe.2015.3.187/install-doc/test-compiler-intel.sh 
TEST_MODULE_NAME = compiler/intel/15.0 
[...] 

Documentation

Online documentation

Intel C-Compiler Documentation

Local documentation

For version specific documentation see the help page of the module. For example 'module help compiler/intel' will show the information for the default version.

$ module help compiler/intel

Manual Pages

For detailed lists of the different program options consult the particular man page

$ man icc
$ man icpc
$ man ifort
$ man idb

Debugger

GUI

The Intel® Debugger is an Eclipse Rich Client Platform based GUI driven Debugger with exciting features for parallelism and threading.

• Intel Debugger for Linux
• More Infos...

Start the GUI-debugger with the command 'idb [binary-file-name] &'.

Console Mode

The console-mode Intel debugger will be started using the command 'idbc [binary-file]'. idbc module_avail_grep Intel(R) Debugger for applications running on Intel(R) 64, Version 13.0, Build [80.483.23]

---

object file name: module_avail_grep Reading symbols from /pfs/data2/home/kn/kn_kn/kn_pop235844/module_avail_grep...(no debugging symbols found)...done. (idb) list There is no source information in current frame. (idb) help List of classes of commands:

   breakpoints -- Commands for manipulation with breakpoints.
   data        -- Examining data.
   extensions  -- Idb extension commands.
   files       -- Specifying and examing files.
   obscure     -- Obscure features.
   openmp      -- OpenMP support.
   parallel    -- MPI support.
   running     -- Running the program.
   stack       -- Examining the stack.
   status      -- Status inquiries.
   support     -- Support facilities.

To display help on a particular command, enter "help" followed by the command name. Command name abbreviations are allowed if unambiguous.

Optimizations

You can turn on various optimization options to enhance the performance of your program. Which options are the best depends on the specific program and can be determined by benchmarking your code. A command which gives good performance and a decent file size is icc -xHost -O2 ex.c.
There are more aggressive optimization flags and levels (e.g. -O3 or -fast and implied options) but the compiled programs can get quite large due to inlining. Additionally the compilation process will probably take longer. Moreover it may happen that the compiled program is even slower -- or may require installation of additional statically-linked libraries. Such a command would be for example: icc -fast ex.c

Profiling

Profiling an application means augmenting the compiled binary with information on execution counts per source-line (and basic blocks) -- e.g. one may see how many times an if-statement has been evaluated to true. To do so, compile your code with the profile flag: icc -p ex.c -o ex.
Using the gprof tool, one may manually inspect execution count of each executed line of source code.
For compiler optimization, recompile Your source using icc -prof-gen ex.c -o ex then execute the most co]]mmon and typical use-case of your application, and then recompile using the generated profile count (and using optimization): icc -prof-use -O2 ex.c -o ex.

Further literature

A tutorial on optimization can be found at https://software.intel.com/sites/default/files/managed/c1/61/compiler-essentials.1.pdf and to get the different optimization options execute icc -help opt icc -help advanced
or the previously described catch-all option -v --help.