ACCEL Flag Description
Cray Cray XK7

Base Optimization Flags

C benchmarks

• • -O2
  • 
  • OPTIMIZE

  • Specify optimization level n:

    • -O1 does only basic optimizations to reduce code size and execution time
    • -O2 does additional options which do not involve space-speed trade-off
    • -O3 does more optimization, adding function inlining, other interprocedural analysis, and others.
• • -h pragma=acc
  • 
  • Cray_cc, Cray_CC, Cray_ftn
  • COPTIMIZE

  • Enable OpenACC directives.

• • -h nopragma=omp
  • 
  • Cray_cc, Cray_CC, Cray_ftn
  • COPTIMIZE

  • Disable OpenMP directives.

• • -fpic
  • 
  • Cray_cc, Cray_CC, Cray_ftn
  • COPTIMIZE

  • Generates position independent code (PIC)

• • -dynamic
  • 
  • Cray_cc, Cray_CC, Cray_ftn
  • COPTIMIZE

  • Directs the compiler driver to link dynamic libraries at runtime. This option is used to create dynamically linked executable files and may not be used with the -h static or -h shared options. Note that the preferred invocation is to call the generic cc command with the -dynamic option, rather than using this compiler specific option. See the cc(1) man page.

Fortran benchmarks

• • -O2
  • 
  • OPTIMIZE

  • Specify optimization level n:

    • -O1 does only basic optimizations to reduce code size and execution time
    • -O2 does additional options which do not involve space-speed trade-off
    • -O3 does more optimization, adding function inlining, other interprocedural analysis, and others.
• • -h acc,noomp
  • 
  • Cray_cc, Cray_CC, Cray_ftn
  • FOPTIMIZE

  • Enable OpenACC directives and disable OpenMP directives.

• • -em
  • 
  • Cray_cc, Cray_CC, Cray_ftn
  • FOPTIMIZE

  • When this option is enabled, the compiler creates .mod files to hold module information for future compiles.

• • -fpic
  • 
  • Cray_cc, Cray_CC, Cray_ftn
  • FOPTIMIZE

  • Generates position independent code (PIC)

• • -dynamic
  • 
  • Cray_cc, Cray_CC, Cray_ftn
  • FOPTIMIZE

  • Directs the compiler driver to link dynamic libraries at runtime. This option is used to create dynamically linked executable files and may not be used with the -h static or -h shared options. Note that the preferred invocation is to call the generic cc command with the -dynamic option, rather than using this compiler specific option. See the cc(1) man page.

Benchmarks using both Fortran and C

• • -O2
  • 
  • OPTIMIZE

  • Specify optimization level n:

    • -O1 does only basic optimizations to reduce code size and execution time
    • -O2 does additional options which do not involve space-speed trade-off
    • -O3 does more optimization, adding function inlining, other interprocedural analysis, and others.
• • -h pragma=acc
  • 
  • Cray_cc, Cray_CC, Cray_ftn
  • COPTIMIZE

  • Enable OpenACC directives.

• • -h nopragma=omp
  • 
  • Cray_cc, Cray_CC, Cray_ftn
  • COPTIMIZE

  • Disable OpenMP directives.

• • -fpic
  • 
  • Cray_cc, Cray_CC, Cray_ftn
  • COPTIMIZE, FOPTIMIZE

  • Generates position independent code (PIC)

• • -dynamic
  • 
  • Cray_cc, Cray_CC, Cray_ftn
  • COPTIMIZE, FOPTIMIZE

  • Directs the compiler driver to link dynamic libraries at runtime. This option is used to create dynamically linked executable files and may not be used with the -h static or -h shared options. Note that the preferred invocation is to call the generic cc command with the -dynamic option, rather than using this compiler specific option. See the cc(1) man page.

• • -h acc,noomp
  • 
  • Cray_cc, Cray_CC, Cray_ftn
  • FOPTIMIZE

  • Enable OpenACC directives and disable OpenMP directives.

• • -em
  • 
  • Cray_cc, Cray_CC, Cray_ftn
  • FOPTIMIZE

  • When this option is enabled, the compiler creates .mod files to hold module information for future compiles.