Date: Tue, 16 Jun 2015 11:01:27 -0700 From: abhishek kulkarni <abhya007@gmail.com> To: freebsd-dtrace@freebsd.org Subject: Regarding a Sched Dtrace Script for FreeBSD Message-ID: <CAJUVset6fHUGkbgLmd-iGRmaRzD9ZBt5wjMkeec9vW2bmnph0g@mail.gmail.com>
next in thread | raw e-mail | index | archive | help
Hello all,
I am working on Dtrace and trying to implement a sched script for FreeBSD
10.0
The script uses the probes on-cpu and off-cpu.
The purpose is to measure the time that a CPU spends on the current thread.
I am trying to use the aggregation function =E2=80=9CSUM=E2=80=9D to captur=
e the CPU time
for the ping utility. I am doing it by opening a new putty terminal and
running the ping utility in it, and then running the Dtrace script in
another instance of the terminal.
I am also using the time utility in order to verify the Kernel Time for a
ping. The time given by the =E2=80=9CTime=E2=80=9D utility and the Dtrace s=
cript do not
match. Could you please help with this . The following is the Dtrace script
we are trying out :
sched:::on-cpu
/curthread->td_name =3D=3D "ping"/
{
self->ts =3D timestamp;
}
sched:::off-cpu
/self->ts !=3D 0/
{
@delta[curthread->td_name] =3D sum(timestamp - self->ts)/1000000;
self->ts =3D0;
}
Looking forward to hear from you.
Regards
Abhishek kulkarni
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CAJUVset6fHUGkbgLmd-iGRmaRzD9ZBt5wjMkeec9vW2bmnph0g>