live-preview.tex

\section{Live preview}

To get a live preview like in the Linux tool {\tt top}, just issue {\tt perf
top} where one can similarly to {\tt top} sort the columns.

\starttyping
# perf top # interactive
Samples: 2K of event 'cycles:ppp', Event count (approx.): 406286143513
Overhead  Shared Object                     Symbol
  37,89%  chrome                            [.] 0x0000000003e6dcb4
  37,89%  perf-6110.map                     [.] 0x00003c316eabe4f6
  14,50%  [vdso]                            [.] __vdso_gettimeofday
   9,72%  [kernel]                          [k] rb_next
   0,00%  [kernel]                          [k] _nv017513rm
   0,00%  nvidia_drv.so                     [.] 0x0000000000084f46
   0,00%  chrome                            [.] 0x00000000014eb2ff
   0,00%  nvidia_drv.so                     [.] 0x000000000005a8cd
   0,00%  [kernel]                          [k] pci_conf1_read
   0,00%  libc-2.24.so                      [.] _int_malloc
   0,00%  nvidia_drv.so                     [.] 0x000000000005a840
   0,00%  [kernel]                          [k] unix_poll
   0,00%  nvidia_drv.so                     [.] 0x000000000009ea1d
\stoptyping

If only a specific event should be monitored, provide the event as an
argument to {\tt -e, --event}.

\starttyping
# perf top -e task-clock # Software event
# perf top -e r0         # Raw PMU event
\stoptyping