•FP Events/Sec: SIR Event: stall

This is the total number of SIR false stalls (stall only, no trap taken) observed per second.

•FP Events/Sec: SIR Event: trap

This is the total number of SIR true stalls (SWFA trap taken) observed per second.

•FP Events/Fop: zero flush

This is the number of flush to zero events that occur per floating-point operation (not per instruction).

•FP Events/Fop: SIR Event: total

This is the ratio of all SIR stalls and total floating-point operations (not instructions). The SIR count includes both false (stall only, no trap taken) stalls and true (SWFA trap taken) stalls.

•FP Events/Fop: SIR Event: stall

This is the ratio of SIR false stalls (stall only, no trap taken) and total floating-point operations (not instructions).

•FP Events: SIR Event: trap

This is the ratio of SIR true stalls (SWFA trap taken) and total floating-point operations (not instructions).

l1dcache Event Set

The l1dcache event set provides information on L1 data cache miss rates for read misses.

The L1 data cache (L1D cache) is special in that it does not handle all types of memory references. In particular, the L1D cache does not handle floating-point loads, semaphores, lfetch instructions and VHPT loads. The L1D cache is also a write-through, non-store allocate cache. Thus, the only operations that access the L1D are integer loads, RSE loads, and load checks. The metrics reported only consider the operations that actually access the L1D cache.

If you use this event set, the default is to make the measurements irrespective of CPU operating state (that is, user, system, or interrupt states). By default, the idle state is not included in the measurement. You can use command-line options to limit the scope of the measurement. Specifically, you can:

•Limit measurement to a specific privilege level: -m event_set[:alluserkernel]

•Include idle: --exclude-idle False

•Exclude the interruption state: --measure-on-interrupts off

•Only measure the interruption state: --measure-on-interrupts only

The event per kinst (event per 1000 instructions) metrics are computed using all instructions retired. This includes nops, predicated off instructions, failed speculation and instructions and associated recovery code as well as the architecturally visible instruction. You can eliminate idle loops effects by using the command-line option --exclude-idle True (which is the default). The effects of failed speculative operations and TLB misses cannot be directly eliminated, but you can get an estimate of the impact of events from the cspec, dspec, and tlb event sets. You can use the cpi event set to obtain the fraction of all instructions retired that have an architecturally visible result, except for predicated off branches, which are counted as useful instructions (non-taken branch) by the Itanium 2 PMU.

Metrics Available from this Measurement

The following metrics are available from this event set. These descriptions do not take into account any command-line options you might use.

232 Event Set Descriptions for CPU Metrics