Sar (System Activity Reporting) is a software tool I had actually used back in the early 1990s on a System V Release IV Unix platform. These days, on Linux, this package can be installed as the package named "sysstat" (yum install sysstat). It should be found in the general repos of Linux, at least it was on CentOS7.
To cover sar would be redundant. It is a huge package with a lot of options. There's plenty of online resources for that.
I used it for processor and memory, so I used the following commands:
- sar -r 10
- sar -p 10
If you send a Ctl-C interrupt, it will dump the summary statistics over the period of time it was run, on a sampling interval of 10 seconds (specified above).
The processor will dump out sys, usr and idle usage (among other statistics). The memory will also dump out an array of statistics (i.e. including paging), but all I wanted to know was how much memory was used and that is also included.
vnstat was a program I had not used. You can configure this to use a database and store throughput over hours, days, weeks, months, etc (long term). But you can also use it in "live" mode with the "-l" option. And when you do this it works like sar where it will keep stats until it gets an interrupt handle, and then dump out throughput stats (min, average, max) for both send and receive on the interface you specify (if you only use one, then you can just omit the interface as an argument).
I found this to be a very reliable set of weapons to use in addition to those generated from tools like iPerf and iPerf3.
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