Deeper look at CPU utilization : SLOB example

This is a followup to my previous posts on Deeper look at CPU utilization :

• Deeper look at CPU utilization : The power of PMU events
• Deeper look at CPU utilization : TMAM Example

Following a comment from Kevin Closson here is the hierarchical execution cycles breakdown based on the TMAM method before and after enabling HUGEPAGES when running SLOB for testing Logical I/O.

Try these experiments with cached SLOB. That'll be an eye opener. https://t.co/j5l7EljdR2

— Kevin (@kevinclosson) October 27, 2017

This will let’s us identify our micro-architectural bottlenecks and correctly characterize the SLOB workloads !

Deeper look at CPU utilization : TMAM Example

This is a followup to my previous post on Deeper look at CPU utilization : The power of PMU events .

So let’s go back to my previous example using the General Exploration View of Intel VTune  :

Deeper look at CPU utilization : The power of PMU events

Suppose we have a CPU bound application/query/program. How to know what my CPU is really doing ? What’s my CPU bottleneck ? How much my CPU are stalled ? For what resource ? How to characterizes my Workloads ?

Answering this question can helps direct performance tuning !

Let’s take a sample program to analyze :