The common way to determine load for Linux is via
uptime, which processes
$ cat /proc/loadavg 0.64 0.68 0.69 1/558 3043
However, this information is the load average for the past 1,5, and 15 minutes.
However, this is a rolling/trailing indicator and I'd like to get more fine-grained information than one minute (say, I'd like the instantaneous load or perhaps the 5-second load average).
For context, I'm running load tests, and it'd be nice to have more data.