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28 Cards in this Set
- Front
- Back
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what are the 3 types of work loads?
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1. workstation
2. multiuser 3. server |
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nice and renice.
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The nice and renice commands are used to change the priority of a process.
The nice command runs another command at a different priority, while the renice command changes the priority of an already running process. |
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schedtune
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Sets parameters for CPU scheduler and Virtual Memory Manager
processing. |
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svmon
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Captures and analyzes a snapshot of virtual memory.
time Prints the elapsed execution time and the user and system processing time attributed to a command. |
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lslv
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Displays information about a logical volume or the logical volume
allocations of a physical volume. |
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tprof
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The tprof command can be used over a time period to trace the activity of the
CPU. |
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reorgvg
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Reorganizes the physical-partition allocation within a volume group.
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schedtune
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The schedtune command allows you to modify the default behavior of the
scheduling system for threads and processes, and should be used with extreme care by experienced administrators. |
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ps
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Displays the status of processes.
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what does the vmstat command do?
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The vmstat command reports statistics about kernel threads, virtual memory,
disks, traps, and CPU activity. |
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sar
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Collects and reports or records system-activity information.
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tprof
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Reports CPU usage for individual programs and the whole system.
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renice
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Changes the priority of one or more processes.
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nice
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Runs a command at higher- or lower-than-normal priority.
no Displays or sets network options. |
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sar
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The sar command writes to standard output the contents of selected cumulative
activity counters in the operating system. |
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memory bound?
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A system is memory-bound if some virtual memory is forced
out to disk, meaning the system is waiting on a relatively slow disk instead of relatively fast RAM. This is indicated by a non-zero value in the page-in (pi) and page-out (po) values. |
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lsattr
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Displays the attributes of devices.
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iostat
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Reports CPU and I/O statistics.
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nfsstat
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Displays statistics about Network File System (NFS) and Remote
Procedure Call (RPC) activity. |
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what is the svmon command used for?
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The svmon command provides a more in-depth analysis of memory usage. It is
more informative, but also more intrusive, than the vmstat commands. |
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netstat
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Displays the contents of network-related data structures.
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what is the netstat command used for?
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The netstat command symbolically displays the contents of various
network-related data structures for active connections. |
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how is the iostat command used?
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The iostat command is used for monitoring system input/output device loading
by observing the time the physical disks are active in relation to their average transfer rates. |
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trace
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Records and reports selected system events.
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vmstat
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Reports virtual-memory activity and other system statistics.
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what is the wlm?
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The Workload Manager (WLM) allows the system administrator to divide
resources between jobs. |
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cpu bound?
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A system is said to be CPU-bound if the total system (sy) and
user (us) CPU usage is approaching 100 percent. This would imply that idle time and wait time for CPU are approaching zero. |
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what 2 reports does the iostat command generate?
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The iostat command generates two types of reports, the tty and CPU Utilization
report and the Disk Utilization report. |
