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Performance monitoring commands


See also

Redbooks IBM Links Recommended Links   Reference
Hardening Security  Performance tuning Log administration profile and kshrc JFS Tivoli
sudo AIX Networking mksysb Command Aix JFS2 snapshots AIX Logical Volume Manager    
Precompiled Binaries and RPMs Compilation of open source on AIX GCC on AIX Tips





Reports the placement of a file's blocks within a file system. Used to examine and assess the efficiency of a file's placement on disk.

Example: fileplace -pv /unix



Performance statistics for CPU usage, network device-driver I/O, socket calls, and NFS I/O. For CPU usage, it estimates how much of this usage is due to network-related activities.


  1. netpmon -o /tmp/netpmon.log -O all
  2. trcstop

    The trcstop command will terminate the trace initiated by the netpmon command.



Report statistics about paging space.

Example: lsps -a



Report statistics for ttys, disks and cpu

Examples What it does
iostat -d hdisk0 hdisk1 5 Will monitor disk activity only for physical volumes hdisk0 1
iostat -t 5 Will monitor terminal activity only and display tty statistics every 5 seconds



Status of interprocess communication facilities. This is a kernel attribute that cannot be modified.



Lists attributes associated with a device.

NOTE: maxmbuf sets the limit of the memory governed by the IPC and network buffering capability.

Examples What it does
lsattr -l sys0 -E Entries marked 'True' are attributes that can be configured
lsattr -l sys0 -a maxpout=9 -a minpout=6 Changes the HIGH/LOW water marks for pending write I/Os per file.



Display information about NFS and RPC calls

Examples What it does
nfsstat Displays statistics about NFS and RPC calls
nfsstat -zcsr Initializes statistics (to ZERO) for client (-c), server (-s), and rpc (-r) calls.



Display system page size



Display status of current processes. This command is useful for determining if runaway processes are excessively utilizing the CPU or memory.

For example, if a machine was just rebooted and appears to be running slowly, use this command to see if there are any getty processes running wild, using excessive CPU time.

Examples What it does
ps avg a displays information about all processes. v displays fields: PGIN,SIZE,RSS,LIM,TSIZE,TRS,%CPU,%MEM
ps -ft tty2/0 Lists all the processes running on port tty2/0
ps -furoger Lists all the processes running under the user roger
ps -e Display the environment as well as the command
ps -ef Full listing of all processes in the system. If the 'C' field (means processor utilization) has a large value, this means that that process is a CPU intensive task.
ps -t - Lists processes not associated with a terminal



Statistics about system attributes. This utility is useful to determine how much paging is in use. If the amount of paging space is less than the amount of real memory in the system, it's possible the system will run out of paging space before real memory. This is because AIX performs early allocation of page space. When a page is referenced, real memory and paging space blocks are allocated. If there are less paging space blocks then real memory pages, paging space will be exhaused before all of real memory is consumed.

Examples What it does
pstat -s Displays paging space statistics
pstat -T Displays system variables



System Activity Recorder utility found on all UNIX systems that monitors various system functions like

Use cron to execute sar at specific times based on workload, and the sa1 and sa2 scripts to maintain a report history of system usage.

Examples What it does
nohup sar -A -o /tmp/SAR.STATS 60 600 > /dev/null & Collect all the statistics that sar monitors at 60 second intervals for a 10 hour period. Also redirects console output to null device
sar -u 5 10 Interactively run the sar command and review CPU utlization every 10 seconds for 5 interations.



Virtual memory monitor that captures a snapshot of the current contents of both real and virtual memory, and summarizes the contents. Useful for determining which processes are using the most memory.



Detailed profile of CPU usage by an application. Provides an estimate of CPU usage for each routine in a profile. Useful to determine where an application maybe CPU bound.



Statistics about virtual memory and cpu/hard disk usage.

Example: vmstat hdisk0 hdisk1 5 (Display various statistics every 5 seconds)



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