Hello rtl people,
I was wondering how one can test on the spot if the rtlinux just installed
is indeed working properly, and what kind of benchmarks one can give.
Also, what kind of relation is there between the scheduling precision, the
hardware setup, and the linux configuration.
I had a hard time to find proper tests (any concise info, collection of
performance-tests, etc, would be still welcome!). I gathered from the
mailing lists and various places the following two methods:
1.
cd /usr/rtlinux/
./regression.sh
less (or cat/more, whatever) regression.log
...
For me, this test was almost useless, 99% of the logfile is such as:
1 Warning: loading regression/fifo_module.o will taint the kernel: no license
2 Warning: loading regression/fifo_module.o will taint the kernel: no license
4 Warning: loading regression/fifo_module.o will taint the kernel: no license
8 Warning: loading regression/fifo_module.o will taint the kernel: no license
16 Warning: loading regression/fifo_module.o will taint the kernel: no license
32 Warning: loading regression/fifo_module.o will taint the kernel: no license
64 Warning: loading regression/fifo_module.o will taint the kernel: no license
128 Warning: loading regression/fifo_module.o will taint the kernel: no license
However, the file also tells the following:
system (/sbin/rmmod thread_time): Success
Warning: loading regression/thread_time.o will taint the kernel: no license
poll (&fifo_poll, 1, 1600): Success
OR sometimes (if i am lucky?):
system (/sbin/rmmod thread_time): Success
Warning: loading regression/thread_time.o will taint the kernel: no license
avg_drift: 3.06 us worst_drift: 15.04 us
*** Q: Could anyone shed some light on what exactly these mean, and why is
that I don't see most of the time the "avg_drift" line?
Average drift of the start of periodically emitted signals? Monotonic
drift? Or the avg value of the (absolute-value of the) deviation
between the real signal and theoretical time of emission?
2. The other method:
cd /usr/rtlinux/examples/measurements
insmod rt_process.o
./monitor > /tmp/rtlinux.stat
...let it run for a few days...
<CNTRL-C>
Look at /tmp/rtlinux.stat and get some statistics.
*** Q: Again, a bit of an explanation on what is in the file would be
appreciated.
The min column is always 0,sometimes 32, no other value. The max
value is between 0 and "infinity". The median is usually around
5000, but values as big as 10^6 occur.
*** Q: Any other good method for testing the performance of a system?
Scripts would be welcome.
Cheers,
Gaspar
+ ------------------------------------------------------------------------ +
Gaspar A. Bakos
Predoctoral Fellow, Solar and Stellar Physics Division
Harvard-Smithsonian Center for Astrophysics
60 Garden Street, Cambridge, MA 02138 (USA)
Phone(office): 617-495-7410 Fax: 617-495-7049
email: [EMAIL PROTECTED] or [EMAIL PROTECTED]
homepage: http://cfa-www.harvard.edu/~gbakos
+ ------------------------------------------------------------------------ +
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