jahboater wrote: ↑Sun Nov 10, 2019 10:51 pm
Try this:-
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wget https://raw.githubusercontent.com/ssvb/cpuburn-arm/master/cpuburn-a53.S
gcc -o cpuburn-a53 cpuburn-a53.S
./cpuburn-a53
It uses NEON on all four cores. I don't know of anything else that raises the temp so quickly.
In the early days of the Pi3 it would crash in less than 10 seconds!
I did -- thanks for that.
"top shows":
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top - 22:54:06 up 11 min, 3 users, load average: 3.97, 2.51, 1.09
Tasks: 121 total, 5 running, 116 sleeping, 0 stopped, 0 zombie
%Cpu(s): 99.9 us, 0.1 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
MiB Mem : 3727.6 total, 3460.4 free, 97.8 used, 169.4 buff/cache
MiB Swap: 100.0 total, 100.0 free, 0.0 used. 3503.7 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
907 pi 20 0 1724 64 0 R 100.0 0.0 4:54.18 cpuburn-a+
908 pi 20 0 1724 64 0 R 100.0 0.0 4:54.18 cpuburn-a+
909 pi 20 0 1724 64 0 R 100.0 0.0 4:53.80 cpuburn-a+
906 pi 20 0 1724 312 256 R 100.0 0.0 4:53.97 cpuburn-a+
40 root 20 0 0 0 0 I 0.3 0.0 0:00.90 kworker/3+
...
And only 80°C without fan ...
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pi@raspberrypi4B:~ $ vcgencmd measure_temp
temp=80.0'C
pi@raspberrypi4B:~ $
... after I did what I said -- running the Pi4 (left) that way works like a charme:
P.S:
Update, after 30 minutes of cpuburn still at 80°C!
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pi@raspberrypi4B:~ $ top -bn 1 -1 | head -15
top - 23:21:09 up 38 min, 3 users, load average: 4.02, 4.01, 3.53
Tasks: 122 total, 5 running, 117 sleeping, 0 stopped, 0 zombie
%Cpu0 :100.0 us, 0.0 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
%Cpu1 :100.0 us, 0.0 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
%Cpu2 : 88.9 us, 11.1 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
%Cpu3 :100.0 us, 0.0 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
MiB Mem : 3727.6 total, 3418.3 free, 99.8 used, 209.5 buff/cache
MiB Swap: 100.0 total, 100.0 free, 0.0 used. 3492.4 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
906 pi 20 0 1724 312 256 R 94.1 0.0 31:56.13 cpuburn-a+
907 pi 20 0 1724 64 0 R 94.1 0.0 31:56.36 cpuburn-a+
908 pi 20 0 1724 64 0 R 94.1 0.0 31:57.14 cpuburn-a+
909 pi 20 0 1724 64 0 R 88.2 0.0 31:55.69 cpuburn-a+
1125 pi 20 0 10188 2756 2444 R 5.9 0.1 0:00.01 top
pi@raspberrypi4B:~ $
temp=80.0'C
pi@raspberrypi4B:~ $