Appendix C. Probes 145C.5.9. Linux::Process Count TotalThe Linux::Process Count Total probe monitors a system and collects the following metric:• Process Count — The total number of processes currently running on the system.Requirements — The Red Hat Network Monitoring Daemon (rhnmd) must be running on the moni-tored system to execute this probe.Field ValueTimeout* 15Critical Maximum Process CountWarning Maximum Process CountTable C-23. Linux::Process Count Total settingsC.5.10. Linux::Process HealthThe Linux::Process Health probe monitors user-specified processes and collects the following metrics:• CPU Usage — The CPU usage rate for a given process in milliseconds per second. This metricreports the time column of ps output, which is the cumulative CPU time used by the process. Thismakes the metric independent of probe interval, allows sane thresholds to be set, and generatesusable graphs (i.e. a sudden spike in CPU usage shows up as a spike in the graph).• Child Process Groups — The number of child processes spawned from the specified parent process.A child process inherits most of its attributes, such as open files, from its parent.• Threads — The number of running threads for a given process. A thread is the basic unit of CPUutilization, and consists of a program counter, a register set, and a stack space. A thread is alsocalled a lightweight process.• Physical Memory Used — The amount of physical memory (or RAM) in kilobytes being used bythe specified process.• Virtual Memory Used — The amount of virtual memory in kilobytes being used by the specifiedprocess, or the size of the process in real memory plus swap.Specify the process by either command name or process I.D. (PID). Entering a PID will override theentry of a command name. If no command name or PID is entered, the error Command not foundwill be displayed and the probe will be set to a CRITICAL state.Requirements — The Red Hat Network Monitoring Daemon (rhnmd) must be running on the moni-tored system to execute this probe.Field ValueCommand NameProcess ID (PID) fileTimeout* 15Critical Maximum CPU UsageWarning Maximum CPU Usage
