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SYSTEMTAP EXAMPLES INDEX BY SUBSYSTEM
(see also index.txt, keyword-index.txt)
= CPU =
general/graphs.stp - Graphing Disk and CPU Utilization
subsystems: disk cpu, keywords: disk cpu use graph
The script tracks the disk and CPU utilization. The resulting output
of the script can be piped into gnuplot to generate a graph of disk
and CPU USE.
= DISK =
general/graphs.stp - Graphing Disk and CPU Utilization
subsystems: disk cpu, keywords: disk cpu use graph
The script tracks the disk and CPU utilization. The resulting output
of the script can be piped into gnuplot to generate a graph of disk
and CPU USE.
io/disktop.stp - Summarize Disk Read/Write Traffic
subsystems: disk, keywords: disk
Get the status of reading/writing disk every 5 seconds, output top
ten entries during that period.
= GENERAL =
general/para-callgraph.stp - Callgraph tracing with arguments
subsystems: general, keywords: trace callgraph
Print a timed per-thread callgraph, complete with function parameters
and return values. The first parameter names the function probe
points to trace. The optional second parameter names the probe
points for trigger functions, which acts to enable tracing for only
those functions that occur while the current thread is nested within
the trigger.
= IO =
io/io_submit.stp - Tally Reschedule Reason During AIO io_submit Call
subsystems: io, keywords: io backtrace
When a reschedule occurs during an AIO io_submit call, accumulate the
traceback in a histogram. When the script exits prints out a sorted
list from most common to least common backtrace.
io/iotop.stp - Periodically Print I/O Activity by Process Name
subsystems: io, keywords: io
Every five seconds print out the top ten executables generating I/O
traffic during that interval sorted in descending order.
io/traceio.stp - Track Cumulative I/O Activity by Process Name
subsystems: io, keywords: io
Every second print out the top ten executables sorted in descending
order based on cumulative I/O traffic observed.
io/traceio2.stp - Watch I/O Activity on a Particular Device
subsystems: io, keywords: io
Print out the executable name and process number as reads and writes
to the specified device occur.
= KERNEL =
process/pf2.stp - Profile kernel functions
subsystems: kernel, keywords: profiling
The pf2.stp script sets up time-based sampling. Every five seconds it
prints out a sorted list with the top ten kernel functions with
samples.
profiling/functioncallcount.stp - Count Times Functions Called
subsystems: kernel, keywords: profiling functions
The functioncallcount.stp script takes one argument, a list of
functions to probe. The script will run and count the number of times
that each of the functions on the list is called. On exit the script
will print a sorted list from most frequently to least frequently
called function.
profiling/thread-times.stp - Profile kernel functions
subsystems: kernel, keywords: profiling
The thread-times.stp script sets up time-based sampling. Every five
seconds it prints out a sorted list with the top twenty processes
with samples broken down into percentage total time spent in
user-space and kernel-space.
= LOCKING =
process/futexes.stp - System-Wide Futex Contention
subsystems: locking, keywords: syscall locking futex
The script watches the futex syscall on the system. On exit the
futexes address, the number of contentions, and the average time for
each contention on the futex are printed from lowest pid number to
highest.
= NETWORK =
network/nettop.stp - Periodic Listing of Processes Using Network Interfaces
subsystems: network, keywords: network traffic per-process
Every five seconds the nettop.stp script prints out a list of
processed (PID and command) with the number of packets sent/received
and the amount of data sent/received by the process during that
interval.
network/socket-trace.stp - Trace Functions called in Network Socket Code
subsystems: network, keywords: network socket
The script instrument each of the functions inn the Linux kernel's
net/socket.c file. The script prints out trace. The first element of
a line is time delta in microseconds from the previous entry. This
is followed by the command name and the PID. The "->" and "<-"
indicates function entry and function exit, respectively. The last
element of the line is the function name.
= NONE =
general/helloworld.stp - SystemTap "Hello World" Program
subsystems: none, keywords: simple
A basic "Hello World" program implemented in SystemTap script. It
prints out "hello world" message and then immediately exits.
= SCHEDULER =
process/sleepingBeauties.stp - Generating Backtraces of Threads Waiting for IO Operations
subsystems: scheduler, keywords: io scheduler
The script monitor time threads spend waiting for IO operations (in
"D" state) in the wait_for_completion function. If a thread spends
over 10ms wall-clock time waiting, information is printed out
describing the thread number and executable name. When slow the
wait_for_completion function complete, backtraces for the long
duration calls are printed out.
= SIGNALS =
process/sig_by_pid.stp - Signal Counts by Process ID
subsystems: signals, keywords: signals
Print signal counts by process ID in descending order.
process/sig_by_proc.stp - Signal Counts by Process Name
subsystems: signals, keywords: signals
Print signal counts by process name in descending order.
process/sigkill.stp - Track SIGKILL Signals
subsystems: signals, keywords: signals
The script traces any SIGKILL signals. When that SIGKILL signal is
sent to a process, the script prints out the signal name, the
desination executable and process ID, the executable name user ID
that sent the signal.
process/syscalls_by_pid.stp - System-Wide Count of Syscalls by PID
subsystems: signals, keywords: signals
The script watches for a particular signal sent to a specific
process. When that signal is sent to the specified process, the
script prints out the PID and executable of the process sending the
signal, the PID and executable name of the process receiving the
signal, and the signal number and name.
= SYSCALL =
io/iotime.stp - Trace Time Spent in Read and Write for Files
subsystems: syscall, keywords: syscall read write time io
The script watches each open, close, read, and write syscalls on the
system. For each file the scripts observes opened it accumulates the
amount of wall clock time spend in read and write operations and the
number of bytes read and written. When a file is closed the script
prints out a pair of lines for the file. Both lines begin with a
timestamp in microseconds, the PID number, and the executable name in
parenthesese. The first line with the "access" keyword lists the file
name, the attempted number of bytes for the read and write
operations. The second line with the "iotime" keyword list the file
name and the number of microseconds accumulated in the read and write
syscalls.
process/sleeptime.stp - Trace Time Spent in nanosleep Syscalls
subsystems: syscall, keywords: syscall sleep
The script watches each nanosleep syscall on the system. At the end
of each nanosleep syscall the script prints out a line with a
timestamp in microseconds, the pid, the executable name in
paretheses, the "nanosleep:" key, and the duration of the sleep in
microseconds.
process/syscalls_by_pid.stp - System-Wide Count of Syscalls by PID
subsystems: syscall, keywords: syscall
The script watches all syscall on the system. On exit the script
prints a list showing the number of systemcalls executed by each PID
ordered from greatest to least number of syscalls.
process/syscalls_by_proc.stp - System-Wide Count of Syscalls by Executable
subsystems: syscall, keywords: syscall
The script watches all syscall on the system. On exit the script
prints a list showing the number of systemcalls executed by each
executable ordered from greates to least number of syscalls.
process/wait4time.stp - Trace Time Spent in wait4 Syscalls
subsystems: syscall, keywords: syscall wait4
The script watches each wait4 syscall on the system. At the end of
each wait4 syscall the script prints out a line with a timestamp in
microseconds, the pid, the executable name in paretheses, the
"wait4:" key, the duration of the wait and the PID that the wait4 was
waiting for. If the waited for PID is not specified , it is "-1".
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