NAME¶

uftrace-info - Print tracing information from the current trace data file

SYNOPSIS¶

uftrace info [options]

DESCRIPTION¶

This command prints metadata recorded in the header of a given trace data file.

Alternatively, it can:

•

be used to generate a symbol table of the traced symbols

•

print a task relationship tree for the recorded tasks in the trace

OPTIONS¶

--symbols [EXECUTABLE]

Generate a symbol table for the given traced EXECUTABLE from the recorded trace data. See the example below for the output format: It will print two symbol tables - normal symbols and dynamic symbols: The normal symbols are traced functions in the executable itself. The dynamic symbols are the traced library functions recorded in the trace. Because only the trace data is used to generate symbol information, it will contain different functions than the symbol table of the executable file itself.

--task

Print a task relationship tree instead of the trace metadata.

EXAMPLES¶

This command shows information like below:

$ uftrace record abc
$ uftrace info
# system information
# ==================
# program version     : v0.9 ( dwarf python tui perf sched )
# recorded on         : Wed Sep 19 17:30:39 2018
# cmdline             : uftrace record abc
# cpu info            : Intel(R) Core(TM) i7-3930K CPU @ 3.20GHz
# number of cpus      : 12 / 12 (online / possible)
# memory info         : 19.8 / 23.5 GB (free / total)
# system load         : 0.02 / 0.07 / 0.11 (1 / 5 / 15 min)
# kernel version      : Linux 4.5.4-1-ARCH
# hostname            : sejong
# distro              : "Arch Linux"
#
# process information
# ===================
# number of tasks     : 1
# task list           : 8284(abc)
# exe image           : /home/namhyung/tmp/abc
# build id            : a3c50d25f7dd98dab68e94ef0f215edb06e98434
# pattern             : regex
# exit status         : exited with code: 0
# elapsed time        : 0.003219479 sec
# cpu time            : 0.003 / 0.000 sec (sys / user)
# context switch      : 1 / 1 (voluntary / involuntary)
# max rss             : 3104 KB
# page fault          : 0 / 169 (major / minor)
# disk iops           : 0 / 24 (read / write)
    

To see the symbol table, one can use the --symbols option.

$ uftrace info --symbols
Normal symbols
==============
[ 0] _start (0x400590) size: 42
[ 1] __gmon_start__ (0x4005c0) size: 59
[ 2] a (0x4006c6) size: 19
[ 3] b (0x4006d9) size: 19
[ 4] c (0x4006ec) size: 49
[ 5] main (0x40071d) size: 19
[ 6] __libc_csu_init (0x400730) size: 101
[ 7] __libc_csu_fini (0x4007a0) size: 2
[ 8] atexit (0x4007b0) size: 41
Dynamic symbols
===============
[ 0] getpid (0x400530) size: 16
[ 1] _mcleanup (0x400540) size: 16
[ 2] __libc_start_main (0x400550) size: 16
[ 3] __monstartup (0x400560) size: 16
[ 4] mcount (0x400570) size: 16
[ 5] __cxa_atexit (0x400580) size: 16
    

The --task option shows task family hierarchy.

$ uftrace info --task
[166399] parent


      [166401] child
    

SEE ALSO¶

uftrace(1), uftrace-record(1), uftrace-tui(1)

AUTHORS¶

Namhyung Kim <namhyung@gmail.com>.