sc_usage(1) [opendarwin man page]
SC_USAGE(1) BSD General Commands Manual SC_USAGE(1) NAME
sc_usage -- show system call usage statistics SYNOPSIS
sc_usage [-c codefile] [-e] [-l] [-s interval] pid | cmd | -E execute DESCRIPTION
sc_usage displays an ongoing sample of system call and page fault usage statistics for a given process in a ``top-like'' fashion. It requires root privileges due to the kernel tracing facility it uses to operate. Page faults can be of the following types: PAGE_IN page had to read from disk ZERO_FILL page was created and zero filled COW page was copied from another page CACHE_HIT page was found in the cache The arguments are as follows: -c When the -c option is specified, it expects a path to a codefile that contains the mappings for the system calls. This option over- rides the default location of the system call codefile which is found in /usr/share/misc/trace.codes. -e Specifying the -e option generates output that is sorted by call count. This overrides the default sort by time. -l The -l option causes sc_usage to turn off its continuous window updating style of output and instead output as a continuous scrolling of data. -s By default, sc_usage updates its output at one second intervals. This sampling interval may be changed by specifying the -s option. Enter the interval in seconds. pid | cmd | -E execute The last argument must be a process id, a running command name, or using the -E option, an execution path followed by optional argu- ments. The system call usage data for the process or command is displayed. If the -E flag is used, sc_usage will launch the exe- cutable, pass along any optional arguments and display system call usage date for that executable. The data columns displayed are as follows: TYPE the system call type NUMBER the system call count CPU_TIME the amount of cpu time consumed WAIT_TIME the absolute time the process is waiting CURRENT_TYPE the current system call type LAST_PATHNAME_WAITED_FOR for each active thread, the last pathname that was referenced by a system call that blocked CUR_WAIT_TIME the cumulative time that a thread has been blocked THRD# the thread number PRI current scheduling priority The sc_usage command also displays some global state in the first few lines of output, including the number of preemptions, context switches, threads, faults and system calls, found during the sampling period. The current time and the elapsed time that the command has been running is also displayed here. The sc_usage command is also SIGWINCH savvy, so adjusting your window geometry may change the list of system calls being displayed. Typing a 'q' will cause sc_usage to exit immediately. Typing any other character will cause sc_usage to reset its counters and the display. SAMPLE USAGE
sc_usage Finder -e -s2 sc_usage will sort the Finder process usage data according to system call count and update the output at 2 second intervals. SEE ALSO
fs_usage(1), latency(1), top(1) Mac OS X October 28, 2002 Mac OS X
Check Out this Related Man Page
sar(1) BSD General Commands Manual sar(1) NAME
sar -- system activity reporter SYNOPSIS
sar [-dgpu] [-n mode] [-o filename] t [n] sar [-dgpu] [-n mode] [-e time] [-f filename] [-i seconds] [-s time] DESCRIPTION
The sar command is used to sample and report various cumulative statistic counters maintained by the operating system. It can be invoked in two different ways. In the first usage instance, n samples are reported at t second intervals. If n is not specified, only one sample will be captured. When the -o option is specified, sar will write the binary sampling data to the output file specified by filename. In the second usage instance, there is no on-going sample interval to specify. This is because the sampling input comes from a previously recorded, binary activity file. The binary activity file can be specified using the -f filename option. When the -f option isn't used, sar attempts to open a default binary activity file, /var/log/sa/sadd, where dd represents the current day of the month. The starting and ending time of the report can be restricted using the -e and -s options. Here, the time field is specified in the form hh[:mm[:ss]]. Finally, the -i option can be used to select the sampling interval. Only records at least seconds apart will be reported. When the -i option is not used, all of the previously recorded interval samples are reported. Due to the nature of on-going sample collection, the data is reported in a verbose mode when more than one sampling option is specified. Column headers are printed at the beginning of the report and averages are printed when the sar command terminates. OPTIONS
The following options restrict the sample set that sar reports. -d Report disk activity. device The BSD name of the device. r+w/s The number of reads and writes per second. blks/s Number of blocks (in device's default blocksize) transferred to a device per second. -g Report page-out activity. pgout/s The number of pages paged out per second. -p Report page-in and page fault activity pgin/s The number of pages paged in per second. pflts/s The number of faults that caused a page to be copied in per second. vflts/s The number of times vm_fault routine has been called. -n mode Report network activity with modes DEV, EDEV, or PPP. Multiple network modes can be specified. DEV The DEV mode reports network device statistics. The following information is displayed for each interface. IFACE The network interface name. Ipkts/s The number of packets received per second. Ibytes/s The number of bytes received per second. Opkts/s The number of packets sent per second. Obytes/s The number of bytes sent per second. EDEV The EDEV mode reports network device error statistics. The following information is displayed for each interface. IFACE The interface name. Ierrs/s The input errors per second. Oerrs/s The output errors per second. Coll/s The collisions that occurred per second. Drops/s The number of dropped packets per second. PPP The PPP mode must be specified in order to display ppp connections in the network statistics. This will also turn on the PPP modify mode in sadc (8) when sampling data is not being read from a file. By default, both the collection and report- ing of ppp statistics is turned off. See sadc (8). -u Report CPU activity (default) %usr, %sys, and %idle These report the percentage of time running in user mode, system mode and idle. FILES
/var/log/sa/sadd Default daily activity file that holds the binary sampling data. dd are digits that represent the day of the month. SEE ALSO
sa1(8), sa2(8), sadc(8), iostat(8), vm_stat(1), netstat(1), top(1), sc_usage(1), fs_usage(1) Mac OS X Jul 25, 2003 Mac OS X