The stress program lets you generate load for analysis purposes depending on your needs. System monitoring tools are obviously useful for analyzing resource utilization. (See the "Generating Stress" box for more information.) The process list shows the process ID ( PID), the user ( USER), priority ( PR and NI), memory usage ( VIRT, RES, and SHR), process state ( S, Table 2), percent CPU and memory usage ( %CPU and %MEM), the CPU time the process has used so far, and the process name. If you want to see the values for the processor cores separately, press 1. Top's header area shows the uptime, the number of users, the load average, the number of processes, and various details relating to the CPU (see the "Key Metrics" box). When you do so, the program also updates the general area this means that the display can be a little fidgety during scrolling. The fork offers some additional comfort: For example, you can use the arrow keys to scroll through the process list. The unpretentious but powerful Top is preinstalled on all Linux systems. To see all the information, you need to enlarge the window until additional information stops appearing. In small windows, both automatically omit some columns. However, Atop and Glances only let you hide or restrict certain information. You can configure the list of fields in Top and Htop. Glances additionally logs the last resource bottlenecks in a small area. Color highlights illuminate resource bottlenecks.Īll tools divide the output into two areas: One area displays general system information (CPU, memory, storage, network) the other is a process list.
Glances also offers the ability to monitor remote systems by running in server mode over the network. The newcomer Glances displays as much information as possible on a terminal with 80 characters and 24 rows. Atop also records performance data and supports analysis with reporting functions or even interactive post-processing.
Atop records the CPU, memory, disk, and network utilization, and colors highlight resources that are working at full capacity. Htop delights users with a rollable process list, simple operation via function keys, and ASCII bar graphs for CPU utilization.
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