Cgroups-memory
Anlegen von Control Groups
- cgcreate -g memory:/foo
Welche Parameter sind vorhanden
- cgget -g memory /foo
/foo: memory.use_hierarchy: 1 memory.kmem.tcp.max_usage_in_bytes: 0 memory.kmem.slabinfo: slabinfo - version: 2.1 # name <active_objs> <num_objs> <objsize> <objperslab> <pagesperslab> : tunables <limit> <batchcount> <sharedfactor> : slabdata <active_slabs> <num_slabs> <sharedavail> memory.kmem.tcp.usage_in_bytes: 0 memory.kmem.failcnt: 0 memory.force_empty: memory.max_usage_in_bytes: 0 memory.swappiness: 60 memory.limit_in_bytes: 9223372036854771712 memory.kmem.usage_in_bytes: 0 memory.pressure_level: memory.kmem.max_usage_in_bytes: 0 memory.kmem.tcp.limit_in_bytes: 9223372036854771712 memory.stat: cache 0 rss 0 rss_huge 0 mapped_file 0 dirty 0 writeback 0 pgpgin 0 pgpgout 0 pgfault 0 pgmajfault 0 inactive_anon 0 active_anon 0 inactive_file 0 active_file 0 unevictable 0 hierarchical_memory_limit 9223372036854771712 total_cache 0 total_rss 0 total_rss_huge 0 total_mapped_file 0 total_dirty 0 total_writeback 0 total_pgpgin 0 total_pgpgout 0 total_pgfault 0 total_pgmajfault 0 total_inactive_anon 0 total_active_anon 0 total_inactive_file 0 total_active_file 0 total_unevictable 0 memory.numa_stat: total=0 N0=0 file=0 N0=0 anon=0 N0=0 unevictable=0 N0=0 hierarchical_total=0 N0=0 hierarchical_file=0 N0=0 hierarchical_anon=0 N0=0 hierarchical_unevictable=0 N0=0 memory.kmem.tcp.failcnt: 0 memory.oom_control: oom_kill_disable 0 under_oom 0 memory.kmem.limit_in_bytes: 9223372036854771712 memory.soft_limit_in_bytes: 9223372036854771712 memory.failcnt: 0 memory.usage_in_bytes: 0 memory.move_charge_at_immigrate: 0
Check the maximum memory limit
- cgget -g memory /foo | grep memory.limit_in_bytes
memory.limit_in_bytes: 9223372036854771712
Set the maximum memory limit to 100MB
- echo 100000000 > /sys/fs/cgroup/memory/foo/memory.limit_in_bytes
Check the maximum memory limit again
- cgget -g memory /foo | grep memory.limit_in_bytes
memory.limit_in_bytes: 99999744
Testprogramm
- apt install mathomatic-primes
3 Limitierte Prozesse und einen Unlimitierten 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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