NAME

       syscount - Summarize syscall counts and latencies.

SYNOPSIS

       syscount [-h] [-p PID] [-i INTERVAL] [-d DURATION] [-T TOP] [-x] [-e ERRNO] [-L] [-m] [-P] [-l]

DESCRIPTION

       This  tool traces syscall entry and exit tracepoints and summarizes either the number of syscalls of each
       type, or the number of syscalls per process. It can also  collect  latency  (invocation  time)  for  each
       syscall or each process.

       Since this uses BPF, only the root user can use this tool.

REQUIREMENTS

       CONFIG_BPF  and  bcc. Linux 4.7+ is required to attach a BPF program to the raw_syscalls:sys_{enter,exit}
       tracepoints, used by this tool.

OPTIONS

       -h     Print usage message.

       -p PID Trace only this process.

       -i INTERVAL
              Print the summary at the specified interval (in seconds).

       -d DURATION
              Total duration of trace (in seconds).

       -T TOP Print only this many entries. Default: 10.

       -x     Trace only failed syscalls (i.e., the return value from the syscall was < 0).

       -e ERRNO
              Trace only syscalls that failed with that error (e.g. -e EPERM or -e 1).

       -m     Display times in milliseconds. Default: microseconds.

       -P     Summarize by process and not by syscall.

       -l     List the syscalls recognized by the tool (hard-coded list). Syscalls beyond this list  will  still
              be displayed, as "[unknown: nnn]" where nnn is the syscall number.

EXAMPLES

       Summarize all syscalls by syscall:
              # syscount

       Summarize all syscalls by process:
              # syscount -P

       Summarize only failed syscalls:
              # syscount -x

       Summarize only syscalls that failed with EPERM:
              # syscount -e EPERM

       Trace PID 181 only:
              # syscount -p 181

       Summarize syscalls counts and latencies:
              # syscount -L

FIELDS

       PID    Process ID

       COMM   Process name

       SYSCALL
              Syscall name, or "[unknown: nnn]" for syscalls that aren't recognized

       COUNT  The number of events

       TIME   The total elapsed time (in us or ms)

OVERHEAD

       For  most  applications,  the  overhead  should  be manageable if they perform 1000's or even 10,000's of
       syscalls per second. For higher rates, the overhead may become considerable. For example, tracing a  loop
       of  4  million  calls to geteuid(), slows it down by 1.85x when tracing only syscall counts, and slows it
       down by more than 5x when tracing syscall counts and latencies. However, this represents a rate  of  >3.5
       million syscalls per second, which should not be typical.

SOURCE

       This is from bcc.

              https://github.com/iovisor/bcc

       Also  look  in  the bcc distribution for a companion _examples.txt file containing example usage, output,
       and commentary for this tool.

OS

       Linux

STABILITY

       Unstable - in development.

AUTHOR

       Sasha Goldshtein

SEE ALSO

       funccount(8), ucalls(8), argdist(8), trace(8), funclatency(8)

USER COMMANDS                                      2017-02-15                                        syscount(8)