On Saturday 08 April 2017 10:39:09 Fox Mulder wrote: > On the Rpi you can get the current speed of the cpu with the following > command: cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq > And that says its running at 1200000, eg full speed for a 4 core.
> But beware that the Rpi default uses the on-demand governor for cpu > clocking. This means when you overclock the Rpi and it is idle you get > a lower clock with this command. Only when the CPU is on heavy load it > will get overclocked and the command shows this. > It was, when I left to go tend the washing machine, makeing air copies of the lathe_pawn.ngc. I've rerouted some cables to get them a bit further from the motor drivers, but what its doing now is the test run. If no joint errors, it should make 50 copies of it. Hasn't made it to the end of the 7nth yet. I need to go to tsc or somewhere, wallies maybe, and get me some of those 3 to 2 electrical adaptors as I just found my gigahertz sampler scopes 3rd wire ground pin is .2 ohms from a damned probe ground lead, so just hooking up a ground lead is making a ground loop. I may even just uncover the darned thing and see if I can find the jumper and cut it. What the hell were they thinking? > You can also set the threshold when the CPU gets overclocked (in > percent CPU load) with help of the following file. System default is > 50% on my Rpi and 95% on my desktop PC: > /sys/devices/system/cpu/cpufreq/ondemand/up_threshold > > Ciao, > Rainer > > Am 08.04.2017 um 16:15 schrieb Gene Heskett: > > On Saturday 08 April 2017 09:33:33 sam sokolik wrote: > >> does cat /proc/cpuinfo work? > > > > It doesn't answer the how fast is it now question Sam, only stating > > the present bogomips as 38.something per core. > > > > I have found a line in /boot/config.txt that seems to say its > > running at 700 MHz as default, and could uncomment a line that tells > > it to run at 800 MHz. > > > > But I suspect that is assuming no stickon heat sinks, which I have > > on it, and which aren't noticably warm. With the heat sinks on it, > > and forced fan cooling 1200 MHz. I may clone that u-sd card to use > > as a recovery, then raise that to 800 MHz. Wash, rinse & repeat > > until its heating according to my ir thermometer, to an unhealthy > > temp. I don't have a fan on it. But if it will do 1 GHz, that would > > be a noticable improvement. > > > > Unfortunately, the spi buss seems to be limited by the slew rate of > > a gpio pin to about 32 MHz. A single spi clock pulse, on a gigahertz > > scope, is a quite good approximation of a classic sine-squared > > pulse, very little evidence of an extended logic 1 to trigger the > > 7i90, and so fussy that the 7i90 will not talk to it if the 10x > > probe is on the signal at lcnc startup. I do not know how, but it > > might be helped if the pi could drive two gpio's for the clocking > > signal, thereby increasing the slew rate by paralleling two gpio's > > for that function. That of course would need a modified adaptor > > board to combine them. Better yet would be a schmidt trigger buffer > > to steepen up the sides of the pulse, and by adjusting the trigger > > level, widen the pulse by a couple nanoseconds. All this of coarse > > would be before the src termination on the adaptor board. > > > > Thank you Sam. > > > > Cheers, Gene Heskett > > ---------------------------------------------------------------------- >-------- Check out the vibrant tech community on one of the world's > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
