Waitopedia is a comprehensive resource of information about SQL Server waits.
The description shown below is the top answer as voted by the Spotlight community.
The charts are based on 2.1 TB of data collected from 4207 instances uploaded by 323 Spotlight users over an 8 week period.
PREEMPTIVE_OS_SQMLAUNCH
What is PREEMPTIVE_OS_SQMLAUNCH?
This wait never occurs for most instances
For each of 4207 instances, we ranked PREEMPTIVE_OS_SQMLAUNCH on how frequent it is compared to all other recent waits. The chart shows the total of all rankings.
Prevalence of PREEMPTIVE_OS_SQMLAUNCH across the Spotlight Population
For 75 % of hours with this wait, average wait time is less than 0.16 ms
For each instance, we found all the recent hours when it had a PREEMPTIVE_OS_SQMLAUNCH wait. We found the average latency for each of those hours.
1040 instances contributed data to this chart