Cgroups-cpu

Anlegen von Control Groups

• cgcreate -g cpu:/cpulimited
• cgcreate -g cpu:/lesscpulimited

Welche Parameter sind vorhanden

• cgget -g cpu /cpulimited

/cpulimited:
cpu.shares: 1024
cpu.cfs_quota_us: -1
cpu.stat: nr_periods 0
	nr_throttled 0
	throttled_time 0
cpu.cfs_period_us: 100000

• cgget -g cpu /lesscpulimited

/lesscpulimited:
cpu.shares: 1024
cpu.cfs_quota_us: -1
cpu.stat: nr_periods 0
	nr_throttled 0
	throttled_time 0
cpu.cfs_period_us: 100000

cpu.shares auf 512 in den cpulimited group

Normaler Wert ist 1024

• cgset -r cpu.shares=512 cpulimited

Testprogramm

• apt install mathomatic-primes

3 Limitierte Prozesse und ein unlimiierten starten

• cgexec -g cpu:cpulimited matho-primes 0 9999999999 > /dev/null
• cgexec -g cpu:cpulimited matho-primes 0 9999999999 > /dev/null
• cgexec -g cpu:cpulimited matho-primes 0 9999999999 > /dev/null
• cgexec -g cpu:lesscpulimited matho-primes 0 9999999999 > /dev/null

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