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The Uptime Infrastructure Monitor agent uses the sar utility (with the -u and -f options) to collect the metrics listed below from a Tru64 agent. The statistics returned by the agent are averaged for all CPUs on the system.
| Metric | ExplanationDescription |
|---|---|
% Usr | The amount of time that the CPU spends in user mode. |
% Sys | The amount of time that the kernel spends processing system calls. |
% WIO | The amount of waiting time that a runable process for a device takes to perform an I/O operation. |
Multi CPU Usage | Whether or not a system with multiple CPUs is effectively balancing tasks between CPUs, or if processes are being forced off CPUs in certain circumstances. |
Run Queue Length | The percentage of time that one or more services or processes are waiting to be served by the CPU. |
Run Queue Occupancy | The percentage of time that one or more services or processes are waiting to be served by the CPU. |
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Multi-CPU
The Uptime Infrastructure Monitor UIM agent uses the psrinfo utility on a Tru64 system to collect information about CPUs, then uses the sar and mps tat utilities to collect the metrics listed below from systems with multiple CPUs. The CPU statistics output by the agent are an average of all the CPUs on the server.
| Metric | ExplanationDescription | |
|---|---|---|
Us er | The percentage of CPU user processes that are in use. | |
Sys tem | The percentage of CPU kernel processes that are in use. | |
Wa it Wait I | The percentage of time that a process which can be run must wait for a device to perform an I/O operation. | |
SMSMTX | The number of read or write locks that a thread was not able to acquire on the first attempt, as reported by the | |
TXXCAL | XC AL | The number of interprocess cross-calls. In a multi-processor environment, one processor sends cross-calls to another processor to get that processor to do work. Cross-calls can also be used to ensure consistency in virtual memory. Heavy file system activity such as NFS can result in a high number of cross-calls. |
Int err uptsInterrupts | The number of CPU interrupts. | |
Tot al | The total amount of User %, System %, and Wait I/O%O %. |
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Memory
The Uptime Infrastructure Monitor UIM agent uses the following commands to collect memory metrics from a Tru64 system:
vmstat
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swapon -s(free swap)
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sar -b -f(cache)
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sar -g -f(paging and swapping)
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sar -p -f(page-in activity)
The statistics that the agent returns are for the entire system.
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