Managing system performance

Quick reference guide to managing performance

To initialize the kernel-recording mechanism:
```
   prfld
```
See profiler(ADM).
To collect kernel profiling data:
```
   prfdc
```
See profiler(ADM).
To collect kernel profiling data at the time of invocation only:
```
   prfsnap
```
See profiler(ADM).
To collect system activity data automatically:
```
   sadc
```
See sadc(ADM).
To collect system activity data on demand:
```
   sar
```
See sar(ADM). The following options are available with sar:

-a
check file access operations

-b
check buffer activity

-c
check system calls

-d
check disk activity

-g
check page-out and memory freeing activity

-k
check kernel memory allocation

-m
check interprocess communication

-p
check page-in and fault rates

-q
check queue activity

-r
check unused memory

-t
check inode activity by filesystem type

-u
check CPU utilization to determine if large I/O transfers are slowing the system

-v
check system table status

-w
check swapping and switching volume

-y
check terminal activity

-A
report overall system performance

-P
reports system activity for specified processors only

-R
reports raw data values
To compress an entire filesystem:

/usr/sbin/dcopy fs1 fs2
See dcopy(ADM).
To compress a single directory:

mv /home/bob /home/obob
mkdir /home/bob
cd /home/obob
find . -print | cpio -plm ../bob
cd ..
rm -rf obob
See find(C) and cpio(C).
To determine the elapsed time, user time, and system time spent in execution of a command:

timex
See timex(C).
To enable, disable, or check the status of the sampling mechanism:

prfstat
See profiler(ADM).
To find large, inefficient directories:

find / -type d -size +20 -print
See find(C).
NOTE: The size argument to the find command is in 512-byte blocks.
To find inactive files:

find / -mtime +90 -atime +90 -print > file
See find(C).
To move user directories:

cd /fs1
find userx usery -print | cpio -pdm /fs2
rm -rf /fs1/userx /fs1/usery
See find(C) and cpio(C).
To print out the number of free file blocks and inodes:

df
See df(ADM).
To print the data collected by prfdc or prfsnap:

prfpr
See profiler(ADM).
To summarize filesystem usage:

du
See du(ADM).
To terminate a runaway process:

kill -9 pid
See kill(C).
To use a shell script to collect and store data in the binary file /var/adm/sa/sadd:

sa1
See sadc(ADM).
To use a shell script to collect and store data in the ASCII file /var/adm/sa/sardd:

sa2
See sadc(ADM).