I have a Dell 5820 running Ubuntu Server 18.04 with SGE installed. I have a queue set up for 20 slots which I fill with 20 jobs running at the same time. % CPU goes up to about 70% and I have 128GB so no problems there.
I am worried about CPU overheating. I look at what happens with watch sensors and see:
coretemp-isa-0000
Adapter: ISA adapter
Package id 0: +82.0°C (high = +81.0°C, crit = +91.0°C)
Core 0: +80.0°C (high = +81.0°C, crit = +91.0°C)
Core 1: +77.0°C (high = +81.0°C, crit = +91.0°C)
Core 2: +78.0°C (high = +81.0°C, crit = +91.0°C)
Core 3: +78.0°C (high = +81.0°C, crit = +91.0°C)
Core 4: +77.0°C (high = +81.0°C, crit = +91.0°C)
Core 5: +75.0°C (high = +81.0°C, crit = +91.0°C)
Core 6: +82.0°C (high = +81.0°C, crit = +91.0°C)
Core 8: +76.0°C (high = +81.0°C, crit = +91.0°C)
Core 9: +79.0°C (high = +81.0°C, crit = +91.0°C)
Core 10: +82.0°C (high = +81.0°C, crit = +91.0°C)
Core 11: +82.0°C (high = +81.0°C, crit = +91.0°C)
Core 12: +81.0°C (high = +81.0°C, crit = +91.0°C)
Core 13: +78.0°C (high = +81.0°C, crit = +91.0°C)
Core 14: +80.0°C (high = +81.0°C, crit = +91.0°C)
So the CPU runs very hot (82C).
My confusion is why the fan RPM stays so low, even after wating for a few minutes:
dell_smm-virtual-0
Adapter: Virtual device
fan1: 1573 RPM
fan2: 722 RPM
fan3: 684 RPM
I know the fan works well because it spins up to > 2000 in Bios diagnostics. Moreover, when I run a simple stress test in Ubuntu using
stress --cpu 8 the fan spins up after a few seconds:
dell_smm-virtual-0
Adapter: Virtual device
fan1: 3567 RPM
fan2: 716 RPM
fan3: 3384 RPM
Is this normal? Can someone explain this? Why does the fan not trigger higher RPM when using SGE? Obviously I am worried about frying the CPU with such high temps.
