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Intel (R) C++/Fortran compiler options, compilers 9.1
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NAME
icc - invokes the Intel(R) C++ compiler
ifort - invokes the Intel(R) Fortran Compiler
OPTIONS
-O1 Optimize to favor code size and code locality.
Disables loop unrolling. -O1 may improve perfor-
mance for applications with very large code size,
many branches, and execution time not dominated by
code within loops. In most cases, -O2 is recom-
mended over -O1.
Itanium architecture-based systems: Disables soft-
ware pipelining and global code scheduling.
-O2 (DEFAULT)
Optimize for code speed. This is the generally rec-
ommended optimization level.
Itanium architecture-based systems: Turns software
pipelining ON.
-O3 Enable -O2 optimizations and in addition, enable
more aggressive optimizations such as loop and mem-
ory access transformation, and prefetching. The
-O3 option optimizes for maximum speed, but may not
improve performance for some programs. The -O3
optimizations may slow down code in some cases com-
pared to -O2 optimizations. Recommended for appli-
cations that have loops with heavy use of floating
point calculations and process large data sets.
-fast The -fast option maximizes speed across the entire
program. It sets the following command options that
can improve run-time performance:-O3, -ipo, and
-static.
-auto-ilp32
Specifies that the application should run within a
32-bit address space. Also tells the compiler to
use 32-bit pointers whenever possible. To use this
option, you must specify -ipo.
-[no-]ansi-alias
The -ansi-alias option directs the compiler to
assume that the program adheres to the rules
defined in the ISO C Standard. If your program
adheres to these rules, then this option will allow
the compiler to optimize more aggressively. If it
doesn't adhere to these rules, then it can cause
the compiler to generate incorrect code.
-[no-]IPF-fp-relaxed
Enable [disable] use of faster but slightly less
accurate code sequences for math functions, such as
divide and square root.
-prof-gen[x]
Instruct the compiler to produce instrumented code
in your object files in preparation for
instrumented execution. With the x qualifier, extra
information is gathered. This option is used in
Phase 1 of PGO to instruct the compiler to produce
instrumented code in your object files in prepara-
tion for instrumented execution. Parallel make is
automatically supported for -prof-genx compila-
tions.
-prof-use
Instruct the compiler to produce a profile-opti-
mized executable and merge available dynamic infor-
mation (.dyn) files into a pgopti.dpi file. Use the
-prof-use option in Phase 3 of PGO.
-static
Prevent linking with shared libraries. Causes the
executable to link all libraries statically, as
opposed to dynamically.
-include file
Process file as if "#include "file" appeared as the
first line of the primary source file. However, the
first directory searched for file is the preproces-
sor's working directory instead of the directory
containing the main source file.If not found there,
it is searched for in the remainder of the "#inclu-
de "..."" search chain as normal.
If multiple -include options are given, the files
are included in the order they appear on the comman
d line.
ENVIRONMENT VARIABLES
LD_LIBRARY_PATH
Specifies the location for all Intel-provided
libraries. The LD_LIBRARY_PATH environment variable
contains a colon-separated list of directories in
which the linker will search for library (.a)
files. If you want the linker to search additional
libraries, you can add their names to
LD_LIBRARY_PATH, to the command line, to a response
file, or to the configuration file. In each case,
the names of these libraries are passed to the
linker before the names of the Intel libraries that
the driver always specifies.
PATH Specifies the directories the system searches for
binary executable files.
PROF_DIR
Specifies the directory in which dynamic informa-
tion files are created. This variable applies to
all three phases of the profiling process.
PROF_NO_CLOBBER
Alters the feedback compilation phase slightly. By
default, during the feedback compilation phase, the
compiler merges the data from all dynamic informa-
tion files and creates a new pgopti.dpi file if
.dyn files are newer than an existing pgopti.dpi
file. When this variable is set, the compiler does
not overwrite the existing pgopti.dpi file.
Instead, the compiler issues a warning and you must
remove the pgopti.dpi file if you want to use addi-
tional dynamic information files.
COPYRIGHT INFORMATION
Copyright (C) 2002 - 2006, Intel Corporation. All
rights reserved.
* Other brands and names are the property of their
respective owners.
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taskset
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NAME
taskset - retrieve or set a processes's CPU affinity
SYNOPSIS
taskset [options] [mask | list ] [pid | command
[arg]...]
DESCRIPTION
taskset is used to set or retrieve the CPU affinity of
a running process given its PID or to launch a new COM-
MAND with a given CPU affinity. CPU affinity is a
scheduler property that "bonds" a process to a given
set of CPUs on the system. The Linux scheduler will
honor the given CPU affinity and the process will not
run on any other CPUs. Note that the Linux scheduler
also supports natural CPU affinity: the scheduler
attempts to keep processes on the same CPU as long as
practical for performance reasons. Therefore, forcing
a specific CPU affinity is useful only in certain
applications.
The CPU affinity is represented as a bitmask, with the
lowest order bit corresponding to the first logical CPU
and the highest order bit corresponding to the last
logical CPU. Not all CPUs may exist on a given system
but a mask may specify more CPUs than are present. A
retrieved mask will reflect only the bits that corre-
spond to CPUs physically on the system. If an invalid
mask is given (i.e., one that corresponds to no valid
CPUs on the current system) an error is returned. The
masks are typically given in hexadecimal. For example,
0x00000001
is processor #0
0x00000003
is processors #0 and #1
0xFFFFFFFF
is all processors (#0 through #31)
When taskset returns, it is guaranteed that the given
program has been scheduled to a legal CPU.
OPTIONS
-c, --cpu-list
specifiy a numerical list of processors instead
of a bitmask. The list may contain multiple
items, separated by comma, and ranges. For
example, 0,5,7,9-11.
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Hardware setting
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Memory system is in "Non Mirror Mode".
PRIMEQUEST 580 memory system supports DSSA (Dual Sync System
Architecture )
and works in one of following two modes.
(1) Extented Mirror Mode
Address buses and Data buses are duplicated.
And most of internal action of chipset is also duplicated.
In this mode, system memory throughput becomes half but higher
reliability is expected by the memory system duplication.
(2) Non Mirror Mode
Address buses and data buses are not duplicated.
And the internal action of chipset is not duplicated.
In this mode, full memory bandwidth is available,
but the system duplication for higher reliability does not work.
Please see the detail of DSSA in the attached file.
"FUJITSU-PRIMEQUEST-20051109_2.pdf".
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Other Notes
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+FDO PASS1= -prof-gen PASS2= -prof-use
Using feedback-directed optimization, a profile is gen-
erated on the first pass of compilation and used on the
second pass.
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Portability flags for SPEC CPU2000
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-Dalloca=_alloca Replace occurrences of alloca() with
_alloca.
-DSPEC_CPU2000_LP64 Compile using LP64 programming model.
-DLINUX_i386 Linux Intel system, use "long long"
as 64bit variable.
-DHAS_ERRLIST Prog env provides specification for
"sys_errlist[]".
-DSPEC_CPU2000_NEED_BOOL Use SPEC provided definition of the
boolean type.
-DSPEC_CPU2000_LINUX_IA64 Compile for an IA64 system running
Linux.
-DPSEC_CPU2000_GLIBC22 Compatibility with 2.2 & later versi-
ons of glibc
-DSYS_IS_USG Specifies that the operating system
is USG compliant.
-DSYS_HAS_TIME_PROTO Do not explicitly declare time().
-DSYS_HAS_SIGNAL_PROTO Do not explicitly #include <signal.h>
-DSYS_HAS_IOCTL_PROTO Do not explicitly declare ioctl().
-DSYS_HAS_CALLOC_PROTO Do not explicitly declare calloc().
-include unistd.h include <unistd.h> for the definition
of 'HZ'
-FI Fixed-format F90 source code.