can we measure the traffic between user and kernel mode

[Alexandre Courbot]

> Here the libc has grouped all your printfs into one single system call
> because of user-space buffering. Fortunately you can prevent this
> behavior using unbuffer:
>
> http://linuxcommand.org/man_pages/unbuffer1.html

Sorry, that should have read stdbuf, and the correct man page is here:

http://www.pixelbeat.org/programming/stdio_buffering/stdbuf-man.html

Alex.