ssrun: Performance Experiments (hardware counter)

• The R1x000 event counters can be used for performance analysis. All experiments are described in man ssrun(1)

• Useful experiments:

  • -[f]dsc_hwc
    • Counts overflows of the 2nd level cache miss counter (counter 26)
    • the address is recorded if counter reaches 131 counts (29 for “fast”)
  • -[f]gfp_hwc
    • overflows of the graduated floating point instruction counter (21)
    • the address is recorded if counter reaches 32771 counts (6553 for “fast” experiments)
  • -prof_hwctime
    • profiles the counter specified by the environment variable _SPEEDSHOP_HWC_COUNTER_PROF_NUMBER using call-stack sampling
    • addresses are recorded based on the overflow of the env variable _SPEEDSHOP_HWC_COUNTER_OVERFLOW
  • -prof_hwc
    • same as prof_hwctime for PC sampling with event counter overflow

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