hp-ic10-flags
SPEC CPU2006 Flag Description for the Linux Intel(R) C++ Compiler 10.0
for EM64T-based applications and Intel(R) Fortran Compiler 10.0 for EM64T-based
applications
Platform settings
One or more of the following settings may have been set. If so, the "Platform Notes" section of the
report will say so; and you can read below to find out more about what these settings mean.
Power Regulator for ProLiant support (Default=HP Dynamic Power Savings Mode)
Values for this BIOS setting can be:
- HP Dynamic Power Savings Mode: Automatically varies processor
speed and power usage based on processor utilization. Allows
reducing overall power consumption with little or no impact to
performance. Does not require OS support.
- HP Static Low Power Mode: Reduces processor speed and power usage.
Guarantees a lower maximum power usage for the system. Performance
impacts will be greater for environments with higher processor
utilization.
- HP Static High Performance Mode: Processors will run in their
maximum power/performance state at all times regardless of the
OS power managment policy.
- OS Control Mode: Processors will run in their maximum power/
performance state at all times unless the OS enables' a power
management policy.
Adjacent Sector Prefetch (Default = Enabled):
This BIOS option allows the enabling/disabling of a processor mechanism to
fetch the adjacent cache line within an 128-byte sector that contains
the data needed due to a cache line miss.
In some limited cases, setting this option to Disabled may improve
performance. In the majority of cases, the default value of Enabled
provides better performance. Users should only disable this option
after performing application benchmarking to verify improved
performance in their environment.
Hardware Prefetch (Default = Enabled):
This BIOS option allows allows the enabling/disabling of a processor
mechanism to prefetch data into the cache according to a pattern
recognition algorithm.
In some limited cases, setting this option to Disabled may improve
performance. In the majority of cases, the default value of Enabled
provides better performance. Users should only disable this option
after performing application benchmarking to verify improved
performance in their environment.
submit= MYMASK=`printf '0x%x' \$((1<<\$SPECCOPYNUM))`; /usr/bin/taskset \$MYMASK $command
When running multiple copies of benchmarks, the SPEC config file feature
submit is sometimes used to cause individual jobs to be bound to
specific processors. This specific submit command is used for Linux.
The description of the elements of the command are:
- /usr/bin/taskset [options] [mask] [pid | command [arg] ... ]:
taskset is used to set or retreive the CPU affinity of a running
process given its PID or to launch a new COMMAND with a given CPU
affinity. The CPU affinity is represented as a bitmask, with the
lowest order bit corresponding to the first logical CPU and highest
order bit corresponding to the last logical CPU. When the taskset
returns, it is guaranteed that the given program has been scheduled
to a legal CPU.
The default behaviour of taskset is to run a new command with a
given affinity mask:
taskset [mask] [command] [arguments]
- $MYMASK: The bitmask (in hexadecimal) corresponding to a specific
SPECCOPYNUM. For example, $MYMASK value for the first copy of a
rate run will be 0x00000001, for the second copy of the rate will
be 0x00000002 etc. Thus, the first copy of the rate run will have a
CPU affinity of CPU0, the second copy will have the affinity CPU1
etc.
- $command: Program to be started, in this case, the benchmark instance
to be started.
ulimit -s (Linux)
Sets the stack size to n kbytes, or unlimited to allow the stack size
to grow without limit.
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/opt/intel/fc/10.0.023/bin/ifort
/opt/intel/fc/10.0.023/bin/ifort invokes the 32-bit Intel Fortran compiler.
Also used to invoke linker for 32-bit programs
in Fortran and C/Fortran mixtures.
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ifort
Invoke the 64-bit Intel Fortran compiler.
Also used to invoke linker for 64-bit programs
in Fortran and C/Fortran mixtures.
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/opt/intel/cc/10.0.023/bin/icc
/opt/intel/cc/10.0.023/bin/icc invokes the 32-bit Intel C compiler.
Also used to invoke linker for 32-bit C programs.
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/opt/intel/cce/10.0.023/bin/icc
/opt/intel/cce/10.0.023/bin/icc invokes the 64-bit Intel C compiler.
Also used to invoke linker for 64-bit C programs.
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/opt/intel/cc/10.0.023/bin/icpc
/opt/intel/cc/10.0.023/bin/icpc invokes the 32-bit Intel C++ compiler.
Also used to invoke linker for 32-bit C++ programs.
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icc
Invoke the Intel C compiler.
Also used to invoke linker for C programs.
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icpc
Invoke the Intel C++ compiler.
Also used to invoke linker for C++ programs.
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-I/opt/intel/cc/10.0.023/include
-I/opt/intel/cc/10.0.023/include is the include path of 32-bit Intel C/C++ compiler
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-I/opt/intel/cce/10.0.023/include
-I/opt/intel/cce/10.0.023/include is the include path of 64-bit Intel C/C++ compiler
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-L/opt/intel/cc/10.0.023/lib
-L/opt/intel/cc/10.0.023/lib is the library path of 32-bit Intel C/C++ compiler
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-L/opt/intel/cce/10.0.023/lib
-L/opt/intel/cce/10.0.023/lib is the library path of 64-bit Intel C/C++ compiler
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-I/opt/intel/fc/10.0.023/include
-I/opt/intel/fc/10.0.023/include is the include path of 32-bit Intel Fortran compiler
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-L/opt/intel/fc/10.0.023/lib
-L/opt/intel/fc/10.0.023/lib is the library path of 32-bit Intel Fortran compiler
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For mixed-language benchmarks, tell the compiler to ignore the main routine in Fortran
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optimize for speed, but disable some optimizations which increase
code size for a small speed benefit. Includes inline expansion
except for intrinsic functions, global optimizations, string
pooling optimizations. On Linux platforms, -O1 sets the
following:
-unroll0, -fno-builtin -mno-ieee-fp -fomit-frame-pointer -ffunction-sections
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This is the default level of optimization.
Optimizes for speed. The -O2 option includes O1 optimizations
and in addition enables inlining of intrinsics and more speed
optimizations.
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Builds on -01 and -02 optimizations by enabling high-level
optimization. This level does not guarantee higher performance
unless loop and memory access transformation take place. In
conjunction with -axK/-xK and -axW/-xW, this switch causes the
compiler to perform more aggressive data dependency analysis than
for -O2. This may result in longer compilation times. On Linux
platforms, -O3 sets the following:
-fp
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Enable use of ANSI aliasing rules in optimizations.
This option tells the compiler to assume that the program adheres to
ISO C Standard aliasability rules. If your program adheres to these rules,
then this option allows the compiler to optimize more aggressively. If it
doesn't adhere to these rules, then it can cause the compiler to generate
incorrect code.
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Tells the compiler not to assume aliasing in the program (DEFAULT = -falias).
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enable single-file IP optimizations
(within files, same as -Ob2)
Multi-file ip optimizations that includes:
- inline function expansion
- interprocedural constant propogation
- dead code elimination
- propagation of function characteristics
- passing arguments in registers
- loop-invariant code motion
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The -fast option enhances execution speed across the entire program
by including the following options that can improve run-time performance:
-O3 (maximum speed and high-level optimizations)
-ipo (enables interprocedural optimizations across files)
-xT (generate code specialized for Intel(R) Core(TM)2 Duo processors,
Intel(R) Core(TM)2 Quad processors and Intel(R) Xeon(R) processors with SSSE3)
-no-prec-div (disable -prec-div)
where -prec-div improves precision of FP divides (some speed impact)
-static (statically link libraries during compilation)
To override one of the options set by /fast, specify that option after the
-fast option on the command line. The options set by /fast may change from
release to release.
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-L/opt/sh8/lib -lsmartheap
-L -lsmartheap ,
when used as an EXTRA_CLIB or EXTRA_CXXLIB variable,
results in linking with MicroQuill's SmartHeap 8.1 (32-bit) library
for Linux. This is a library that optimizes calls to new, delete, malloc and free.
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The -xN and -xP options target your program to run on Intel Pentium 4
and compatible Intel processors. The resulting code might contain
unconditional use of features that are not supported on other processors.
Programs, where the function main() is compiled with this option, will
detect non compatible processors and generate an error message during
execution. This option also enables new optimizations in addition to Intel
processor specific optimizations.
These options also enable advanced data layout and code restructuring
optimizations to improve memory accesses for Intel processors.
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Code is optimized for Intel(R) Core(TM)2 Duo processors, Intel(R) Core(TM)2 Quad processors
and Intel(R) Xeon(R) processors with SSSE3. The resulting code may contain unconditional use of
features that are not supported on other processors. This option also enables new optimizations
in addition to Intel processor-specific optimizations including advanced data layout and code
restructuring optimizations to improve memory accesses for Intel processors.
Do not use this option if you are executing a program on a processor that is not an Intel processor.
If you use this option on a non-compatible processor to compile the main program (in Fortran) or
the function main() in C/C++, the program will display a fatal run-time error if they are executed
on unsupported processors.
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(disable -prec-div)
(disable/enable[default] -Qprec-div[-]) (Windows) [-no]-prec-div (Linux)
-Qprec-dev (Windows) and -prec-div (Linux) improves precision of floating-point divides.
It has a slight impact on speed. -Qprec-dev- (Windows) and -no-prec-div (Linux) disables this
option and enables optimizations that give slightly less precise results than full IEEE division.
When you specify -Qprec-dev- (Windows) or -no-prec-div (Linux) along with some optimizations,
such as -xN and -xB (Linux) or /QxN and /QxB (Windows), the compiler may change floating-point division
computations into multiplication by the reciprocal of the denominator. For example, A/B is computed as A * (1/B)
to improve the speed of the computation.
However, sometimes the value produced by this transformation is not as accurate as full IEEE division.
When it is important to have fully precise IEEE division, do not use -Qprec-dev- (Windows) or -no-prec-div (Linux)
which will enable the default -Qprec-dev (Windows) or -prec-div (Linux) and the result is more accurate,
with some loss of performance.
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This option enables prefetch insertion optimization. To use this option,
you must also specify O3.
The goal of prefetching is to reduce cache misses by providing hints to
the processor about when data should be loaded into the cache.
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Instrument program for profiling for the first phase of
two-phase profile guided otimization. This instrumentation gathers information
about a program's execution paths and data values but does not gather
information from hardware performance counters. The profile instrumentation
also gathers data for optimizations which are unique to profile-feedback
optimization.
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Instructs the compiler to produce a profile-optimized
executable and merges available dynamic information (.dyn)
files into a pgopti.dpi file. If you perform multiple
executions of the instrumented program, -prof_use merges
the dynamic information files again and overwrites the
previous pgopti.dpi file.
Without any other options, the current directory is
searched for .dyn files
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This option instructs the compiler to analyze the program to
determine if there are 64-bit pointers which can be safely
shrunk into 32-bit pointers. In order for this option to be
effective the compiler must be able to optimize using the
-ipo option, and must be able to analyze all library/external
calls the program makes. This option imposes the following
restrictions on the program:
The program cannot malloc any objects greater than 2**31 bytes
in size.
If the program does not satisfy this restriction, unpredictable
behavior may occur.
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Enables improved floating-point consistency. Floating-point operations
are not reordered and the result of each floating-point operation is
stored in the target variable rather than being kept in the floating-
point processor for use in a subsequent calculation. This is the same
as specifying -fltconsistency or -mp.
The default, -mno-ieee-fp, provides better accuracy and run-time per-
formance at the expense of less consistent floating-point results.
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Enable using EBP as general purpose register.
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Separate functions for the linker (COMDAT). Same as -fdata-sections.
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Tells the compiler the maximum number of times to unroll loops.
Disables inline expansion of all intrinsic functions.
Disable using EBP as general purpose register.
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This option prevents linking with shared libraries. It
causes the executable to link all libraries statically.
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Enables generation of streaming stores for optimization.
always - Enables generation of streaming stores for optimization.
The compiler optimizes under the assumption that the application is memory bound.
auto - compiler decides when streaming stores are used (DEFAULT)
never - disables generation of streaming stores
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Specifies the level of inline function expansion.
Ob0 - Disables inlining of user-defined functions. Note that statement functions are always inlined.
Ob1 - Enables inlining when an inline keyword or an inline attribute is specified.
Also enables inlining according to the C++ language.
Ob2 - Enables inlining of any function at the compiler's discretion.
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syntax: -Wl,-z,muldefs
Enable SmartHeap and/or other library usage by forcing the linker to ignore
multiple definitions if present
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Scalar replacement is not performed during loop transformation.
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Enables scalar replacement performed during loop transformation.
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