On Mon, 5 Dec 2011 21:05:32 -0500 Bei Guan <gbtju85@xxxxxxxxx> wrote: > 2011/12/5 Clark Williams <williams@xxxxxxxxxx> > > > Bei, > > > > That's a git tree. You'll need to compile the images from there. > > > > What distro are you using? Debian delivers rt-tests as a .deb, so you > > could just apt-get it from there. I don't think Fedora delivers > > rt-tests as an RPM. > > > I have two distros, Fedora and Ubuntu. Under the Fedora, I just use "make > install" and it seems to work well. Now I can use the command cyclictest in > Fedora. > > But, under the Ubuntu, you mean I can use apt-get. Is the following right? > apt-get install github.com/clrkwllms/rt-tests.git > (But it doesn't work. Please correct me.) No you don't need to specify the git repository; there should be a package already set up in the stable debian: apt-get install rt-tests > > > Another question, how to get the histogram graphic using the cyclictest. I > use the following command but I cannot get it. > > [root@localhost ~]# cyclictest -h -s -p 80 -n -i 10000 -l 1000 > WARNING: High resolution timers not available > policy: fifo: loadavg: 0.13 0.10 0.09 4/229 5283 > > T: 0 ( 5283) P:80 I:10000 C: 1000 Min: 14420 Act:14496 Avg:14712 Max: > 24567 > WARNING: unable to open events/enable > The histogram option (-h) takes an argument, which is the max value to record in microseconds. So, -h100 would generate a 100 element histogram (1 microsecond per line). Since it doesn't look like you're running on an RT kernel (no hrtimers available), you'll have a wide variance in response times, so you'll need a big histogram range to catch everything. Try this: # cyclictest -t -p80 -m -i 10000 -l 1000 -h 10000 Then be ready for 10000 lines of output when you control-C out of cyclictest. Clark
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