Re: [patch 2.6.12-rc1-mm4] fork_connector: add a fork connector

Evgeniy Polyakov
2005-04-11T06:45:43Z

On Sun, Apr 10, 2005 at 10:43:24PM -0700, Jay Lan (jlan@engr.sgi.com) wrote:
> I based my listen program on the fclisten.c posted by Kaigai Kohei
> with my own modification. Unfortunately i lost my test machine in the
> lab. I will recreate the listen program Monday. The original listener
> did not validate sequence number. It also prints length of data and
> sequence number of every message it receives. My listener prints
> only out-of-sequence error messages.
>
> The fork generator fork-test.c was yours? I called it fork-test
> and let it run continuously in while-loop:
>
> # while 1
> # ./fork-test 10000000
> # sleep 1
> # end
>
> I let it do 10,000,000 times of fork continuously while the system
> is running AIM7 and/or ubench.
>
> The original fclisten.c and fork-test.c are attached for your reference.

It is pretty normal to see duplicated numbers in a fork test -
I observed it too, since counter is incremented without locks
we can catch situation when it is incremented simultaneously
on both processors, the latest version of the fork connector
from Guillaume contains processor id in the message and per cpu counters,
so one can destinguish messages which sequence numbers will flow
in a very similar way now.

> - jay
>

--
Evgeniy Polyakov