CPU2017 Flag Description
Dell Inc. PowerEdge T560 (Intel Xeon Bronze 3408U)

Base Optimization Flags

C benchmarks

• • -w
  • 
  • CC, LD

  • Supress compiler warnings.

• • -std=c11
  • 
  • intel_icc,intel_icx,intel_icpx
  • CC, LD

  • Sets the language dialect to conform to the indicated C standard.

• • -m64
  • 
  • intel_icc,intel_icpc,intel_ifort,intel_icx,intel_icpx,intel_ifx
  • CC, LD

  • Compiles for a 64-bit (LP64) data model.

• • -Wl,-z,muldefs
  • 
  • EXTRA_LDFLAGS

  • Enable SmartHeap and/or other library usage by forcing the linker to ignore multiple definitions if present

• • -xsapphirerapids
  • 
  • COPTIMIZE

  • May generate instructions for processors that support the specified Intel processor or microarchitecture code name. Optimizes for the specified Intel processor or microarchitecture code name.

• • -Ofast
  • 
  • COPTIMIZE

  • Enable O3 optimizations plus more aggressive optimizations, such as -ffinite-math-only –no-prec-div

  • Includes:
    • -O3
      • -O2
        • -O1
          • -funroll-loops
          • -fno-builtin
          • -mno-ieee-fp
          • -fomit-framepointer
          • -ffunction-sections
          • -ftz
• • -ffast-math
  • 
  • COPTIMIZE

  • Enable fast math mode. This option may yield faster code for programs that do not require the guarantees of exact implementation of IEEE or ISO rules/specifications for math functions.

• • -flto
  • 
  • COPTIMIZE

  • Performs link time optimizations, which is also known as Interprocedural Optimizations.

• • -mfpmath=sse
  • 
  • COPTIMIZE

  • Generate floating-point arithmetic for selected unit unit. Here use scalar floating-point instructions present in the SSE instruction set

• • -funroll-loops
  • 
  • COPTIMIZE

  • Tells the compiler the maximum number of times to unroll loops. For example -funroll-loops0 would disable unrolling of loops.

• • -qopt-mem-layout-trans=4
  • 
  • COPTIMIZE

  • Controls the level of memory layout transformations performed by the compiler. This option can improve cache reuse and cache locality.

    • 0: Disables memory layout transformations. This is the same as specifying -qno-opt-mem-layout-trans
    • 1: Enable basic memory layout transformations like structure splitting, structure peeling, field inlining, field reordering, array field transpose, increase field alignment etc.
    • 2: Enable more memory layout transformations like advanced structure splitting. This is the same as specifying -qopt-mem-layout-trans
    • 3: Enable more memory layout transformations like copy-in/copy-out of structures for a region of code. You should only use this setting if your system has more than 4GB of physical memory per core.
    • 4: Compiler is more aggressive in using memory layout transformations. You should only use this setting if your system has more than 4GB of physical memory per core.
• • -Wno-implicit-int
  • 
  • EXTRA_CFLAGS

  • -Wno-implicit-int is needed to allow the compiler to accept invalid C code where the type specifier is missing. With this diagnostic disabled, the missing type will be interpreted as `int`, as in C89 (the last version of C in which implicit type specifiers were allowed).

• • -mprefer-vector-width=512
  • 
  • EXTRA_COPTIMIZE

  • Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions.

• • -ljemalloc
  • 
  • EXTRA_LIBS

  • Linker toggle to specify jemalloc linker library. See jemalloc.net for more information.

• • -L/usr/local/jemalloc64-5.0.1/lib
  • 
  • EXTRA_LIBS

  • Specify build time link path for jemalloc 64bit built to support the CPU 2017 build. See jemalloc.net for more information.

C++ benchmarks

• • -w
  • 
  • CXX, LD

  • Supress compiler warnings.

• • -std=c++14
  • 
  • intel_icpc,intel_icx,intel_icpx
  • CXX, LD

  • Sets the language dialect to conform to the indicated C++ standard.

• • -m64
  • 
  • intel_icc,intel_icpc,intel_ifort,intel_icx,intel_icpx,intel_ifx
  • CXX, LD

  • Compiles for a 64-bit (LP64) data model.

• • -Wl,-z,muldefs
  • 
  • EXTRA_LDFLAGS

  • Enable SmartHeap and/or other library usage by forcing the linker to ignore multiple definitions if present

• • -xsapphirerapids
  • 
  • CXXOPTIMIZE

  • May generate instructions for processors that support the specified Intel processor or microarchitecture code name. Optimizes for the specified Intel processor or microarchitecture code name.

• • -Ofast
  • 
  • CXXOPTIMIZE

  • Enable O3 optimizations plus more aggressive optimizations, such as -ffinite-math-only –no-prec-div

  • Includes:
    • -O3
      • -O2
        • -O1
          • -funroll-loops
          • -fno-builtin
          • -mno-ieee-fp
          • -fomit-framepointer
          • -ffunction-sections
          • -ftz
• • -ffast-math
  • 
  • CXXOPTIMIZE

  • Enable fast math mode. This option may yield faster code for programs that do not require the guarantees of exact implementation of IEEE or ISO rules/specifications for math functions.

• • -flto
  • 
  • CXXOPTIMIZE

  • Performs link time optimizations, which is also known as Interprocedural Optimizations.

• • -mfpmath=sse
  • 
  • CXXOPTIMIZE

  • Generate floating-point arithmetic for selected unit unit. Here use scalar floating-point instructions present in the SSE instruction set

• • -funroll-loops
  • 
  • CXXOPTIMIZE

  • Tells the compiler the maximum number of times to unroll loops. For example -funroll-loops0 would disable unrolling of loops.

• • -qopt-mem-layout-trans=4
  • 
  • CXXOPTIMIZE

  • Controls the level of memory layout transformations performed by the compiler. This option can improve cache reuse and cache locality.

    • 0: Disables memory layout transformations. This is the same as specifying -qno-opt-mem-layout-trans
    • 1: Enable basic memory layout transformations like structure splitting, structure peeling, field inlining, field reordering, array field transpose, increase field alignment etc.
    • 2: Enable more memory layout transformations like advanced structure splitting. This is the same as specifying -qopt-mem-layout-trans
    • 3: Enable more memory layout transformations like copy-in/copy-out of structures for a region of code. You should only use this setting if your system has more than 4GB of physical memory per core.
    • 4: Compiler is more aggressive in using memory layout transformations. You should only use this setting if your system has more than 4GB of physical memory per core.
• • -mprefer-vector-width=512
  • 
  • EXTRA_CXXOPTIMIZE

  • Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions.

• • -ljemalloc
  • 
  • EXTRA_LIBS

  • Linker toggle to specify jemalloc linker library. See jemalloc.net for more information.

• • -L/usr/local/jemalloc64-5.0.1/lib
  • 
  • EXTRA_LIBS

  • Specify build time link path for jemalloc 64bit built to support the CPU 2017 build. See jemalloc.net for more information.

Fortran benchmarks

• • -w
  • 
  • FC, LD

  • Supress compiler warnings.

• • -m64
  • 
  • intel_icc,intel_icpc,intel_ifort,intel_icx,intel_icpx,intel_ifx
  • FC, LD

  • Compiles for a 64-bit (LP64) data model.

• • -Wl,-z,muldefs
  • 
  • EXTRA_LDFLAGS

  • Enable SmartHeap and/or other library usage by forcing the linker to ignore multiple definitions if present

• • -xsapphirerapids
  • 
  • FOPTIMIZE

  • May generate instructions for processors that support the specified Intel processor or microarchitecture code name. Optimizes for the specified Intel processor or microarchitecture code name.

• • -Ofast
  • 
  • FOPTIMIZE

  • Enable O3 optimizations plus more aggressive optimizations, such as -ffinite-math-only –no-prec-div

  • Includes:
    • -O3
      • -O2
        • -O1
          • -funroll-loops
          • -fno-builtin
          • -mno-ieee-fp
          • -fomit-framepointer
          • -ffunction-sections
          • -ftz
• • -ffast-math
  • 
  • FOPTIMIZE

  • Enable fast math mode. This option may yield faster code for programs that do not require the guarantees of exact implementation of IEEE or ISO rules/specifications for math functions.

• • -flto
  • 
  • FOPTIMIZE

  • Performs link time optimizations, which is also known as Interprocedural Optimizations.

• • -mfpmath=sse
  • 
  • FOPTIMIZE

  • Generate floating-point arithmetic for selected unit unit. Here use scalar floating-point instructions present in the SSE instruction set

• • -funroll-loops
  • 
  • FOPTIMIZE

  • Tells the compiler the maximum number of times to unroll loops. For example -funroll-loops0 would disable unrolling of loops.

• • -qopt-mem-layout-trans=4
  • 
  • FOPTIMIZE

  • Controls the level of memory layout transformations performed by the compiler. This option can improve cache reuse and cache locality.

    • 0: Disables memory layout transformations. This is the same as specifying -qno-opt-mem-layout-trans
    • 1: Enable basic memory layout transformations like structure splitting, structure peeling, field inlining, field reordering, array field transpose, increase field alignment etc.
    • 2: Enable more memory layout transformations like advanced structure splitting. This is the same as specifying -qopt-mem-layout-trans
    • 3: Enable more memory layout transformations like copy-in/copy-out of structures for a region of code. You should only use this setting if your system has more than 4GB of physical memory per core.
    • 4: Compiler is more aggressive in using memory layout transformations. You should only use this setting if your system has more than 4GB of physical memory per core.
• • -nostandard-realloc-lhs
  • 
  • EXTRA_FOPTIMIZE

  • Option standard-realloc-lhs (the default), tells the compiler that when the left-hand side of an assignment is an allocatable object, it should be reallocated to the shape of the right-hand side of the assignment before the assignment occurs. This is the current Fortran Standard definition. This feature may cause extra overhead at run time. This option has the same effect as option assume realloc_lhs.

    If you specify nostandard-realloc-lhs, the compiler uses the old Fortran 2003 rules when interpreting assignment statements. The left-hand side is assumed to be allocated with the correct shape to hold the right-hand side. If it is not, incorrect behavior will occur. This option has the same effect as option assume norealloc_lhs.

• • -align array32byte
  • 
  • EXTRA_FOPTIMIZE

  • The align toggle changes how data elements are aligned. Variables and arrays are analyzed and memory layout can be altered. Specifying array32byte will look for opportunities to transform and reailgn arrays to 32byte boundaries.

• • -auto
  • 
  • EXTRA_FOPTIMIZE

  • Make all local variables AUTOMATIC. Same as -automatic

• • -ljemalloc
  • 
  • EXTRA_LIBS

  • Linker toggle to specify jemalloc linker library. See jemalloc.net for more information.

• • -L/usr/local/jemalloc64-5.0.1/lib
  • 
  • EXTRA_LIBS

  • Specify build time link path for jemalloc 64bit built to support the CPU 2017 build. See jemalloc.net for more information.

Benchmarks using both Fortran and C

• • -w
  • 
  • CC, FC, LD

  • Supress compiler warnings.

• • -m64
  • 
  • intel_icc,intel_icpc,intel_ifort,intel_icx,intel_icpx,intel_ifx
  • CC, FC, LD

  • Compiles for a 64-bit (LP64) data model.

• • -std=c11
  • 
  • intel_icc,intel_icx,intel_icpx
  • CC

  • Sets the language dialect to conform to the indicated C standard.

• • -Wl,-z,muldefs
  • 
  • EXTRA_LDFLAGS

  • Enable SmartHeap and/or other library usage by forcing the linker to ignore multiple definitions if present

• • -xsapphirerapids
  • 
  • COPTIMIZE, FOPTIMIZE

  • May generate instructions for processors that support the specified Intel processor or microarchitecture code name. Optimizes for the specified Intel processor or microarchitecture code name.

• • -Ofast
  • 
  • COPTIMIZE, FOPTIMIZE

  • Enable O3 optimizations plus more aggressive optimizations, such as -ffinite-math-only –no-prec-div

  • Includes:
    • -O3
      • -O2
        • -O1
          • -funroll-loops
          • -fno-builtin
          • -mno-ieee-fp
          • -fomit-framepointer
          • -ffunction-sections
          • -ftz
• • -ffast-math
  • 
  • COPTIMIZE, FOPTIMIZE

  • Enable fast math mode. This option may yield faster code for programs that do not require the guarantees of exact implementation of IEEE or ISO rules/specifications for math functions.

• • -flto
  • 
  • COPTIMIZE, FOPTIMIZE

  • Performs link time optimizations, which is also known as Interprocedural Optimizations.

• • -mfpmath=sse
  • 
  • COPTIMIZE, FOPTIMIZE

  • Generate floating-point arithmetic for selected unit unit. Here use scalar floating-point instructions present in the SSE instruction set

• • -funroll-loops
  • 
  • COPTIMIZE, FOPTIMIZE

  • Tells the compiler the maximum number of times to unroll loops. For example -funroll-loops0 would disable unrolling of loops.

• • -qopt-mem-layout-trans=4
  • 
  • COPTIMIZE, FOPTIMIZE

  • Controls the level of memory layout transformations performed by the compiler. This option can improve cache reuse and cache locality.

    • 0: Disables memory layout transformations. This is the same as specifying -qno-opt-mem-layout-trans
    • 1: Enable basic memory layout transformations like structure splitting, structure peeling, field inlining, field reordering, array field transpose, increase field alignment etc.
    • 2: Enable more memory layout transformations like advanced structure splitting. This is the same as specifying -qopt-mem-layout-trans
    • 3: Enable more memory layout transformations like copy-in/copy-out of structures for a region of code. You should only use this setting if your system has more than 4GB of physical memory per core.
    • 4: Compiler is more aggressive in using memory layout transformations. You should only use this setting if your system has more than 4GB of physical memory per core.
• • -Wno-implicit-int
  • 
  • EXTRA_CFLAGS

  • -Wno-implicit-int is needed to allow the compiler to accept invalid C code where the type specifier is missing. With this diagnostic disabled, the missing type will be interpreted as `int`, as in C89 (the last version of C in which implicit type specifiers were allowed).

• • -mprefer-vector-width=512
  • 
  • EXTRA_COPTIMIZE

  • Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions.

• • -nostandard-realloc-lhs
  • 
  • EXTRA_FOPTIMIZE

  • Option standard-realloc-lhs (the default), tells the compiler that when the left-hand side of an assignment is an allocatable object, it should be reallocated to the shape of the right-hand side of the assignment before the assignment occurs. This is the current Fortran Standard definition. This feature may cause extra overhead at run time. This option has the same effect as option assume realloc_lhs.

    If you specify nostandard-realloc-lhs, the compiler uses the old Fortran 2003 rules when interpreting assignment statements. The left-hand side is assumed to be allocated with the correct shape to hold the right-hand side. If it is not, incorrect behavior will occur. This option has the same effect as option assume norealloc_lhs.

• • -align array32byte
  • 
  • EXTRA_FOPTIMIZE

  • The align toggle changes how data elements are aligned. Variables and arrays are analyzed and memory layout can be altered. Specifying array32byte will look for opportunities to transform and reailgn arrays to 32byte boundaries.

• • -auto
  • 
  • EXTRA_FOPTIMIZE

  • Make all local variables AUTOMATIC. Same as -automatic

• • -ljemalloc
  • 
  • EXTRA_LIBS

  • Linker toggle to specify jemalloc linker library. See jemalloc.net for more information.

• • -L/usr/local/jemalloc64-5.0.1/lib
  • 
  • EXTRA_LIBS

  • Specify build time link path for jemalloc 64bit built to support the CPU 2017 build. See jemalloc.net for more information.

Benchmarks using both C and C++

• • -w
  • 
  • CC, CXX, LD

  • Supress compiler warnings.

• • -std=c++14
  • 
  • intel_icpc,intel_icx,intel_icpx
  • CXX, LD

  • Sets the language dialect to conform to the indicated C++ standard.

• • -m64
  • 
  • intel_icc,intel_icpc,intel_ifort,intel_icx,intel_icpx,intel_ifx
  • CC, CXX, LD

  • Compiles for a 64-bit (LP64) data model.

• • -std=c11
  • 
  • intel_icc,intel_icx,intel_icpx
  • CC

  • Sets the language dialect to conform to the indicated C standard.

• • -Wl,-z,muldefs
  • 
  • EXTRA_LDFLAGS

  • Enable SmartHeap and/or other library usage by forcing the linker to ignore multiple definitions if present

• • -xsapphirerapids
  • 
  • COPTIMIZE, CXXOPTIMIZE

  • May generate instructions for processors that support the specified Intel processor or microarchitecture code name. Optimizes for the specified Intel processor or microarchitecture code name.

• • -Ofast
  • 
  • COPTIMIZE, CXXOPTIMIZE

  • Enable O3 optimizations plus more aggressive optimizations, such as -ffinite-math-only –no-prec-div

  • Includes:
    • -O3
      • -O2
        • -O1
          • -funroll-loops
          • -fno-builtin
          • -mno-ieee-fp
          • -fomit-framepointer
          • -ffunction-sections
          • -ftz
• • -ffast-math
  • 
  • COPTIMIZE, CXXOPTIMIZE

  • Enable fast math mode. This option may yield faster code for programs that do not require the guarantees of exact implementation of IEEE or ISO rules/specifications for math functions.

• • -flto
  • 
  • COPTIMIZE, CXXOPTIMIZE

  • Performs link time optimizations, which is also known as Interprocedural Optimizations.

• • -mfpmath=sse
  • 
  • COPTIMIZE, CXXOPTIMIZE

  • Generate floating-point arithmetic for selected unit unit. Here use scalar floating-point instructions present in the SSE instruction set

• • -funroll-loops
  • 
  • COPTIMIZE, CXXOPTIMIZE

  • Tells the compiler the maximum number of times to unroll loops. For example -funroll-loops0 would disable unrolling of loops.

• • -qopt-mem-layout-trans=4
  • 
  • COPTIMIZE, CXXOPTIMIZE

  • Controls the level of memory layout transformations performed by the compiler. This option can improve cache reuse and cache locality.

    • 0: Disables memory layout transformations. This is the same as specifying -qno-opt-mem-layout-trans
    • 1: Enable basic memory layout transformations like structure splitting, structure peeling, field inlining, field reordering, array field transpose, increase field alignment etc.
    • 2: Enable more memory layout transformations like advanced structure splitting. This is the same as specifying -qopt-mem-layout-trans
    • 3: Enable more memory layout transformations like copy-in/copy-out of structures for a region of code. You should only use this setting if your system has more than 4GB of physical memory per core.
    • 4: Compiler is more aggressive in using memory layout transformations. You should only use this setting if your system has more than 4GB of physical memory per core.
• • -Wno-implicit-int
  • 
  • EXTRA_CFLAGS

  • -Wno-implicit-int is needed to allow the compiler to accept invalid C code where the type specifier is missing. With this diagnostic disabled, the missing type will be interpreted as `int`, as in C89 (the last version of C in which implicit type specifiers were allowed).

• • -mprefer-vector-width=512
  • 
  • EXTRA_COPTIMIZE, EXTRA_CXXOPTIMIZE

  • Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions.

• • -ljemalloc
  • 
  • EXTRA_LIBS

  • Linker toggle to specify jemalloc linker library. See jemalloc.net for more information.

• • -L/usr/local/jemalloc64-5.0.1/lib
  • 
  • EXTRA_LIBS

  • Specify build time link path for jemalloc 64bit built to support the CPU 2017 build. See jemalloc.net for more information.

Benchmarks using Fortran, C, and C++

• • -w
  • 
  • CC, CXX, FC, LD

  • Supress compiler warnings.

• • -m64
  • 
  • intel_icc,intel_icpc,intel_ifort,intel_icx,intel_icpx,intel_ifx
  • CC, CXX, FC, LD

  • Compiles for a 64-bit (LP64) data model.

• • -std=c++14
  • 
  • intel_icpc,intel_icx,intel_icpx
  • CXX, LD

  • Sets the language dialect to conform to the indicated C++ standard.

• • -std=c11
  • 
  • intel_icc,intel_icx,intel_icpx
  • CC

  • Sets the language dialect to conform to the indicated C standard.

• • -Wl,-z,muldefs
  • 
  • EXTRA_LDFLAGS

  • Enable SmartHeap and/or other library usage by forcing the linker to ignore multiple definitions if present

• • -xsapphirerapids
  • 
  • COPTIMIZE, CXXOPTIMIZE, FOPTIMIZE

  • May generate instructions for processors that support the specified Intel processor or microarchitecture code name. Optimizes for the specified Intel processor or microarchitecture code name.

• • -Ofast
  • 
  • COPTIMIZE, CXXOPTIMIZE, FOPTIMIZE

  • Enable O3 optimizations plus more aggressive optimizations, such as -ffinite-math-only –no-prec-div

  • Includes:
    • -O3
      • -O2
        • -O1
          • -funroll-loops
          • -fno-builtin
          • -mno-ieee-fp
          • -fomit-framepointer
          • -ffunction-sections
          • -ftz
• • -ffast-math
  • 
  • COPTIMIZE, CXXOPTIMIZE, FOPTIMIZE

  • Enable fast math mode. This option may yield faster code for programs that do not require the guarantees of exact implementation of IEEE or ISO rules/specifications for math functions.

• • -flto
  • 
  • COPTIMIZE, CXXOPTIMIZE, FOPTIMIZE

  • Performs link time optimizations, which is also known as Interprocedural Optimizations.

• • -mfpmath=sse
  • 
  • COPTIMIZE, CXXOPTIMIZE, FOPTIMIZE

  • Generate floating-point arithmetic for selected unit unit. Here use scalar floating-point instructions present in the SSE instruction set

• • -funroll-loops
  • 
  • COPTIMIZE, CXXOPTIMIZE, FOPTIMIZE

  • Tells the compiler the maximum number of times to unroll loops. For example -funroll-loops0 would disable unrolling of loops.

• • -qopt-mem-layout-trans=4
  • 
  • COPTIMIZE, CXXOPTIMIZE, FOPTIMIZE

  • Controls the level of memory layout transformations performed by the compiler. This option can improve cache reuse and cache locality.

    • 0: Disables memory layout transformations. This is the same as specifying -qno-opt-mem-layout-trans
    • 1: Enable basic memory layout transformations like structure splitting, structure peeling, field inlining, field reordering, array field transpose, increase field alignment etc.
    • 2: Enable more memory layout transformations like advanced structure splitting. This is the same as specifying -qopt-mem-layout-trans
    • 3: Enable more memory layout transformations like copy-in/copy-out of structures for a region of code. You should only use this setting if your system has more than 4GB of physical memory per core.
    • 4: Compiler is more aggressive in using memory layout transformations. You should only use this setting if your system has more than 4GB of physical memory per core.
• • -Wno-implicit-int
  • 
  • EXTRA_CFLAGS

  • -Wno-implicit-int is needed to allow the compiler to accept invalid C code where the type specifier is missing. With this diagnostic disabled, the missing type will be interpreted as `int`, as in C89 (the last version of C in which implicit type specifiers were allowed).

• • -mprefer-vector-width=512
  • 
  • EXTRA_COPTIMIZE, EXTRA_CXXOPTIMIZE

  • Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions.

• • -nostandard-realloc-lhs
  • 
  • EXTRA_FOPTIMIZE

  • Option standard-realloc-lhs (the default), tells the compiler that when the left-hand side of an assignment is an allocatable object, it should be reallocated to the shape of the right-hand side of the assignment before the assignment occurs. This is the current Fortran Standard definition. This feature may cause extra overhead at run time. This option has the same effect as option assume realloc_lhs.

    If you specify nostandard-realloc-lhs, the compiler uses the old Fortran 2003 rules when interpreting assignment statements. The left-hand side is assumed to be allocated with the correct shape to hold the right-hand side. If it is not, incorrect behavior will occur. This option has the same effect as option assume norealloc_lhs.

• • -align array32byte
  • 
  • EXTRA_FOPTIMIZE

  • The align toggle changes how data elements are aligned. Variables and arrays are analyzed and memory layout can be altered. Specifying array32byte will look for opportunities to transform and reailgn arrays to 32byte boundaries.

• • -auto
  • 
  • EXTRA_FOPTIMIZE

  • Make all local variables AUTOMATIC. Same as -automatic

• • -ljemalloc
  • 
  • EXTRA_LIBS

  • Linker toggle to specify jemalloc linker library. See jemalloc.net for more information.

• • -L/usr/local/jemalloc64-5.0.1/lib
  • 
  • EXTRA_LIBS

  • Specify build time link path for jemalloc 64bit built to support the CPU 2017 build. See jemalloc.net for more information.

Peak Optimization Flags

C benchmarks

519.lbm_r

• • basepeak = yes

538.imagick_r

• • basepeak = yes

544.nab_r

• • basepeak = yes

C++ benchmarks

508.namd_r

• • basepeak = yes

510.parest_r

• • basepeak = yes

Fortran benchmarks

503.bwaves_r

• • basepeak = yes

549.fotonik3d_r

• • basepeak = yes

554.roms_r

• • basepeak = yes

Benchmarks using both Fortran and C

521.wrf_r

• • basepeak = yes

527.cam4_r

• • basepeak = yes

Benchmarks using both C and C++

511.povray_r

• • -w
  • 
  • CC, CXX, LD

  • Supress compiler warnings.

• • -std=c++14
  • 
  • intel_icpc,intel_icx,intel_icpx
  • CXX, LD

  • Sets the language dialect to conform to the indicated C++ standard.

• • -m64
  • 
  • intel_icc,intel_icpc,intel_ifort,intel_icx,intel_icpx,intel_ifx
  • CC, CXX, LD

  • Compiles for a 64-bit (LP64) data model.

• • -std=c11
  • 
  • intel_icc,intel_icx,intel_icpx
  • CC

  • Sets the language dialect to conform to the indicated C standard.

• • -Wl,-z,muldefs
  • 
  • EXTRA_LDFLAGS

  • Enable SmartHeap and/or other library usage by forcing the linker to ignore multiple definitions if present

• • -fprofile-generate
  • 
  • PASS1_CFLAGS, PASS1_CXXFLAGS, PASS1_LDFLAGS

  • 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.

• • -fprofile-use=default.profdata
  • 
  • PASS2_CFLAGS, PASS2_CXXFLAGS, PASS2_LDFLAGS

  • Instructs the compiler to produce a profile-optimized executable and merges available dynamic information.

• • -xCORE-AVX2
  • 
  • PASS1_CFLAGS, PASS1_CXXFLAGS, PASS1_LDFLAGS

  • Code is optimized for Intel(R) processors with support for AVX2 instructions. 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.

• • -flto
  • 
  • COPTIMIZE, CXXOPTIMIZE, PASS1_CFLAGS, PASS1_CXXFLAGS, PASS1_LDFLAGS

  • Performs link time optimizations, which is also known as Interprocedural Optimizations.

• • -Ofast
  • 
  • COPTIMIZE, CXXOPTIMIZE, PASS1_CFLAGS, PASS1_CXXFLAGS, PASS1_LDFLAGS

  • Enable O3 optimizations plus more aggressive optimizations, such as -ffinite-math-only –no-prec-div

  • Includes:
    • -O3
      • -O2
        • -O1
          • -funroll-loops
          • -fno-builtin
          • -mno-ieee-fp
          • -fomit-framepointer
          • -ffunction-sections
          • -ftz
• • -xCORE-AVX512
  • 
  • COPTIMIZE, CXXOPTIMIZE

  • Code is optimized for Intel(R) processors with support for CORE-AVX512 instructions. 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.

• • -ffast-math
  • 
  • COPTIMIZE, CXXOPTIMIZE

  • Enable fast math mode. This option may yield faster code for programs that do not require the guarantees of exact implementation of IEEE or ISO rules/specifications for math functions.

• • -mfpmath=sse
  • 
  • COPTIMIZE, CXXOPTIMIZE

  • Generate floating-point arithmetic for selected unit unit. Here use scalar floating-point instructions present in the SSE instruction set

• • -funroll-loops
  • 
  • COPTIMIZE, CXXOPTIMIZE

  • Tells the compiler the maximum number of times to unroll loops. For example -funroll-loops0 would disable unrolling of loops.

• • -qopt-mem-layout-trans=4
  • 
  • COPTIMIZE, CXXOPTIMIZE

  • Controls the level of memory layout transformations performed by the compiler. This option can improve cache reuse and cache locality.

    • 0: Disables memory layout transformations. This is the same as specifying -qno-opt-mem-layout-trans
    • 1: Enable basic memory layout transformations like structure splitting, structure peeling, field inlining, field reordering, array field transpose, increase field alignment etc.
    • 2: Enable more memory layout transformations like advanced structure splitting. This is the same as specifying -qopt-mem-layout-trans
    • 3: Enable more memory layout transformations like copy-in/copy-out of structures for a region of code. You should only use this setting if your system has more than 4GB of physical memory per core.
    • 4: Compiler is more aggressive in using memory layout transformations. You should only use this setting if your system has more than 4GB of physical memory per core.
• • -Wno-implicit-int
  • 
  • EXTRA_CFLAGS

  • -Wno-implicit-int is needed to allow the compiler to accept invalid C code where the type specifier is missing. With this diagnostic disabled, the missing type will be interpreted as `int`, as in C89 (the last version of C in which implicit type specifiers were allowed).

• • -mprefer-vector-width=512
  • 
  • EXTRA_COPTIMIZE, EXTRA_CXXOPTIMIZE

  • Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions.

• • -ljemalloc
  • 
  • EXTRA_LIBS

  • Linker toggle to specify jemalloc linker library. See jemalloc.net for more information.

• • -L/usr/local/jemalloc64-5.0.1/lib
  • 
  • EXTRA_LIBS

  • Specify build time link path for jemalloc 64bit built to support the CPU 2017 build. See jemalloc.net for more information.

526.blender_r

• • basepeak = yes

Benchmarks using Fortran, C, and C++

507.cactuBSSN_r

• • basepeak = yes