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.
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.