TITLE: Bus Lock
ISSUE_NAME: BUS_LOCK
DESCRIPTION:
Intel® Performance Bottleneck Analyzer
Short Call Return
TITLE: Short Call Return
ISSUE_NAME: SHORT_CALL_RETURN
DESCRIPTION:
Zero Length Calls
TITLE: Zero Length Calls
ISSUE_NAME: ZERO_LENGTH_CALL
DESCRIPTION:
A “zero length call” uses the attribute of the call instruction to push the immediate instruction pointer on to the stack and then pops off that address into a register. This is accomplished without any matching return on the call. This code construct is also commonly referred to as a zero displacement call.
RELEVANCE:
Instruction Starvation
TITLE: Instruction Starvation
ISSUE_NAME: InstructionStarvation
DESCRIPTION:
Execution stalls because the front-end fails to deliver instructions. This metric is the ratio of cycles generated when no instruction was issued by the front-end to all cycles. Such stalls are called Instruction Starvation, and may be due to a large code working set size or a high degree of branch misprediction, which can cause a large number of L1I misses.
RELEVANCE:
Negatively impacts performance as the execution is stalled as it waits for instructions to be delivered by the fronted.
EXAMPLE:
SOLUTION:
Instructions Retired Per Clock Cycle
TITLE: Instructions Retired Per Clock Cycle
ISSUE_NAME: InstructionsPerClock
DESCRIPTION:
The ratio of instructions retired per clock cycle (IPC).
RELEVANCE:
Higher instructions retired per cycle is typically desirable because it represents a larger amount of work being complete in a given unit of time.
EXAMPLE:
SOLUTION:
RELATED_SOURCES:
NOTES:
Front End Bound
TITLE: Front End Bound
ISSUE_NAME: Frontend
DESCRIPTION:
x87 Floating Point Store/Restore for Rounding
TITLE: x87 Floating Point Store/Restore for Rounding ISSUE_NAME: X87_ROUNDING DESCRIPTION: x87 floating point calculations store/restore from stack to round to 32-bit (single precision) or 64-bit (double precision) RELEVANCE: Negatively impacts most architectures on all OSs but costsAtom's Bonnell, Silverthorne and Saltwell (10-12 cycles) since they cannot store cannot be forwarded to loads in the FP domain. EXAMPLE: Here is an example of how x87 math is done with rounding done by storing/restoring from memory in between calculations: fadd fstp [address]
ERROR: Dump file generated for ... is invalid
Does anyone know of workrounds or diagnostics for invalid dump files? The only thing I've seen is a comment to avoid older VTune installation licenses appearing on the "path" and a problem with xed.exe that should now be fixed. On my machine I don't have older vtune information anywhere in the environment or license file, and the data collecting phase proceeded without errors, yet I get an erroras below.
C:\\tmp\\fipde\\pba>java -Xmx1000m xIFJava.Main f "foo.QAG" -jdir "tb5" -NHM
Intel Performance Bottleneck Analyzer - Version 4.0.1 RC3
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