- general/graphs.stp - Graphing Disk and CPU Utilization
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.
- general/helloworld.stp - SystemTap "Hello World" Program
keywords: SIMPLE
A basic "Hello World" program implemented in SystemTap script. It prints out "hello world" message and then immediately exits.
- general/para-callgraph.stp - Callgraph tracing with arguments
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.
- interrupt/scf.stp - Tally Backtraces for Inter-Processor Interrupt (IPI)
keywords: INTERRUPT BACKTRACE
The Linux kernel function smp_call_function causes expensive inter-processor interrupts (IPIs). The scf.stp script tallies the processes and backtraces causing the interprocessor interrupts to identify the cause of the expensive IPI. On exit the script prints the tallies in descending frequency.
- io/disktop.stp - Summarize Disk Read/Write Traffic
keywords: DISK
Get the status of reading/writing disk every 5 seconds, output top ten entries during that period.
- io/io_submit.stp - Tally Reschedule Reason During AIO io_submit Call
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/ioblktime.stp - Average Time Block IO Requests Spend in Queue
keywords: IO
The ioblktime.stp script tracks the amount of time that each block IO requests spend waiting for completion. The script compute the average time waiting time for block IO per device and prints list every 10 seconds. In some cases there can be too many oustanding block IO operations and the script may exceed the default number of MAXMAPENTRIES allowed. In this case the allowed number can be increased with "-DMAXMAPENTRIES=10000" option on the stap command line.
- io/iostats.stp - List Executables Reading and Writing the Most Data
keywords: IO PROFILING
The iostat.stp script measures the amount of data successfully read and written by all the executables on the system. The output is sorted from most greatest sum of bytes read and written by an executable to the least. The output contains the count of operations (opens, reads, and writes), the totals and averages for the number of bytes read and written.
- io/iotime.stp - Trace Time Spent in Read and Write for Files
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.
- io/iotop.stp - Periodically Print I/O Activity by Process Name
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
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
keywords: IO
Print out the executable name and process number as reads and writes to the specified device occur.
- memory/kmalloc-top - Show Paths to Kernel Malloc (kmalloc) Invocations
keywords: MEMORY
The kmalloc-top perl program runs a small systemtap script to collect stack traces for each call to the kmalloc function and counts the time that each stack trace is observed. When kmalloc-top exits it prints out sorted list. The output can be be filtered to print only only the first stack traces (-t) stack traces with more a minimum counts (-m), or exclude certain stack traces (-e).
- memory/pfaults.stp - Generate Log of Major and Minor Page Faults
keywords: MEMORY
The pfaults.stp script generates a simple log for each major and minor page fault that occurs on the system. Each line contains a timestamp (in microseconds) when the page fault servicing was completed, the pid of the process, the address of the page fault, the type of access (read or write), the type of fault (major or minor), and the elapsed time for page fault. This log can be examined to determine where the page faults are occuring.
- network/nettop.stp - Periodic Listing of Processes Using Network Interfaces
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
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.
- network/tcp_connections.stp - Track Creation of Incoming TCP Connections
keywords: NETWORK TCP SOCKET
The tcp_connections.stp script prints information for each new incoming TCP connection accepted by the computer. The information includes the UID, the command accepting the connection, the PID of the command, the port the connection is on, and the IP address of the originator of the request.
- process/futexes.stp - System-Wide Futex Contention
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.
- process/pf2.stp - Profile kernel functions
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.
- process/sig_by_pid.stp - Signal Counts by Process ID
keywords: SIGNALS
Print signal counts by process ID in descending order.
- process/sig_by_proc.stp - Signal Counts by Process Name
keywords: SIGNALS
Print signal counts by process name in descending order.
- process/sigkill.stp - Track SIGKILL 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
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.
- process/sleepingBeauties.stp - Generating Backtraces of Threads Waiting for IO Operations
keywords: IO SCHEDULER BACKTRACE
The script monitors the time that threads spend waiting for IO operations (in "D" state) in the wait_for_completion function. If a thread spends over 10ms, its name and backtrace is printed, and later so is the total delay.
- process/sleeptime.stp - Trace Time Spent in nanosleep Syscalls
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
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
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
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".
- profiling/functioncallcount.stp - Count Times Functions Called
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
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.
- profiling/timeout.stp - Show Processes Doing Polling Operations
keywords: PROFILING
The timeout.stp script is based on a blog entry (http://udrepper.livejournal.com/19041.html) mentioning a need for a tool to help developers find applications that are polling. The timeout.stp script monitors systemcall used for polling and records the systemcalls that timed out rather than returned because some action occurred. The script updates the screen once a second with the top twenty processes.
- profiling/topsys.stp - Show Processes Doing Polling Operations
keywords: PROFILING
The topsys.stp script lists out the top twenty systemcalls for the previous 5 seconds. The output is sorted from most frequent to least frequent.
