cpu reachs 100%

[recrunchi]

Hi !

I'm experiencing 100% usage of cpu by sshttp process (debian7 - kernel 4.1.16-v7+ armv7l raspberry pi2 900mhz cpu). It happens when i stream media over https (sshttp routing).

How can i debug it or increment the type of logging ?

Thanks.
Sergio.

[stealth]

Thats perfectly legit if you hammer sshttp with a lot of packets like in media streaming.
The kernel scheduler would dedicate all CPU ressources to it, unless you run
some other computation-intense process on the same core. So thats OK. It should drop to
0% again if no more packets are seen (I guess the streaming works fine). If you have a lot of streams, you could also use -n switch if your pi has multiple cores.

[recrunchi]

Thanks, i understand. I was suspecting what you said.

So, my raspberry 2 has 4 cores. About the "-n" switch , where do i put it ? maybe at the end of the following line on /etc/init.d/sshttp ?

DAEMON_ARGS="-S $SSH_PORT -H $HTTP_PORT -L $LISTEN_PORT -U $USER -R $CHROOT -n 4"

Reading your readme.md: "Unless -n 1 is used as switch, sshttpd binds one thread per CPU core, to better exploit the hardware if running on heavily used web servers", i understand that the program actually works with 4 cores if i don't specify the "-n" switch...

thank

[stealth]

Correct. "-n 1" forces single core, even when multiple cores are detected. Omitting -n should start
4 sshttpd's on your pi, and only one sshttpd should run 100% if there is only a single
streaming connection. More connections should be distributed by kernel to the remaining
sshttpd's. If you dont see 4 sshttpd's, something got wrong with the core detection and you
could use "-n 4".