User Guide


Execution Stalls

Metric Description

Execution stalls may signify that a machine is running at full capacity, with no computation resources wasted. Sometimes, however, long-latency operations can serialize while waiting for critical computation resources. This metric is the ratio of cycles with no micro-operations executed to all cycles.

Possible Issues

The percentage of cycles with no micro-operations executed is high. Look for long-latency operations at code regions with high execution stalls and try to use alternative methods or lower latency operations. For example, consider replacing 'div' operations with right-shifts, or try to reduce the latency of memory accesses.

Product and Performance Information


Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804