There is an inverse relationship between resource utilization and queue length, under reasonable assumptions. If you think of low CPU utilization as "wasted" CPU and try to fill it up, you can completely kill your service's ability to quickly respond to requests.
I like to make this analogy when talking to people who feel like they are not working hard enough. If you fill up an engineer's time with high-priority work, you get the same problem as if you fill up a machine's CPU with high-priority tasks... you get a system that cannot respond quickly, a system that spends a lot of time overloaded.
It's a fun exercise to try and calculate the relationship between utilization and expected queue length.
Plus, those batch jobs are still important, they're just not as time-sensitive.
There is an inverse relationship between resource utilization and queue length, under reasonable assumptions. If you think of low CPU utilization as "wasted" CPU and try to fill it up, you can completely kill your service's ability to quickly respond to requests.
I like to make this analogy when talking to people who feel like they are not working hard enough. If you fill up an engineer's time with high-priority work, you get the same problem as if you fill up a machine's CPU with high-priority tasks... you get a system that cannot respond quickly, a system that spends a lot of time overloaded.
It's a fun exercise to try and calculate the relationship between utilization and expected queue length.
Plus, those batch jobs are still important, they're just not as time-sensitive.