Thanks for your answer.

Unfortunately, I've already tried Usage and kernelopts but they are not giving me information about the CPU usage. Lots of applications have access to CPU usage and I was wondering if Maple could do it because I'm trying to identify what operation is done by knowing the time that it needs to compute and access memory. (there is approximatively a linear relation)

The problem is that there are fluctuations, and a linear regression doesn't do an accurate job. Knowing the CPU  usage while it is doing the computing may help me to reduce the random part of the measures.

Thanks for your answer.

Unfortunately, I've already tried Usage and kernelopts but they are not giving me information about the CPU usage. Lots of applications have access to CPU usage and I was wondering if Maple could do it because I'm trying to identify what operation is done by knowing the time that it needs to compute and access memory. (there is approximatively a linear relation)

The problem is that there are fluctuations, and a linear regression doesn't do an accurate job. Knowing the CPU  usage while it is doing the computing may help me to reduce the random part of the measures.