How to test Linux-based applications?

[palecopper]

How can I properly test a program on Linux? For example, find out the maximum memory consumption, the amount of used processor time?

I do not mean just to open htop and look, but by analogy with time [application].

[charlenef]

# valgrind --trace-children=yes time echo anus
==5286== Memcheck, a memory error detector
==5286== Command: time echo anus
==5286==
==5289== Memcheck, a memory error detector
==5289== Command: /bin/echo anus
==5289==
anus
==5289==
==5289== HEAP SUMMARY:
==5289==     in use at exit: 0 bytes in 0 blocks
==5289==   total heap usage: 30 allocs, 30 frees, 1,985 bytes allocated
==5289==
==5289== All heap blocks were freed -- no leaks are possible
==5289==
==5289== For counts of detected and suppressed errors, rerun with: -v
==5289== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 13 from 8)
0.43user 0.02system 0:00.46elapsed 99%CPU (0avgtext+0avgdata 107024maxresident)k
0inputs+8outputs (0major+8687minor)pagefaults 0swaps
==5286==
==5286== HEAP SUMMARY:
==5286==     in use at exit: 0 bytes in 0 blocks
==5286==   total heap usage: 0 allocs, 0 frees, 0 bytes allocated
==5286==
==5286== All heap blocks were freed -- no leaks are possible
==5286==
==5286== For counts of detected and suppressed errors, rerun with: -v
==5286== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 13 from 8)

[rotator]

• perf Profiler for GNU / Linux with performance calculation. https://perf.wiki.kernel.org/index.php/Main_Page

• gdb GNU debugger that allows you to "spy" what is happening inside the program during its execution. https://www.gnu.org/software/gdb/

• flame graph A graphical profiler. http://www.brendangregg.com/flamegraphs.html

• strace Used to diagnose and debug programs under GNU / Linux https://strace.io/