Can use stackusage to show the running process stack status?

[xixiguo]

If the process does not exit and running, how to see the stackusage output?
I tried to use the option -o outputfile. But I found that it just show the main process state as below,
stackusage log at 2022-03-12 04:30:37 ----------------------------------------
pid id tid requested actual maxuse max% dur funcP name
394 0 394 8388608 8384512 3856 0 0 (nil) i2cset
This result seems did not include the states of pthreads created by the main process. But the main process created several pthreads. Is there anyone can help?

[d99kris]

Hi @xixiguo - yes it should be possible. From the README:

stackusage -s SIGUSR1 gedit
kill -s SIGUSR1 `pidof gedit`

This also works if you used -o option, at least in my simple gedit test, like:

stackusage -o log.txt -s SIGUSR1 gedit
kill -s SIGUSR1 `pidof gedit`

So basically you need to use kill to signal stackusage to log the current state. Is that what you tried too? Perhaps you can share the exact commands you used to run stackusage as well as how you called kill, if it's still not working. I haven't tried it on i2cset, but I don't think there's anything special with i2cset - unless it has some special signal handling overriding/preventing use of SIGUSR1, SIGUSR2 or others.