John the Ripper. How limit CPU with CGroup

Bob

12/27/22, 11:25 AM

I want limit CPU at John by CGroup.

I did.

cgrules.conf:

*:john      cpu     cpu_1

cgred.conf:

group cpu_1 {
        perm {
                task {
                        uid = root;
                        gid = root;
                }
                admin {
                        uid = root;
                        gid = root;
                }
        }
        cpu {
                cpu.cfs_period_us=100000;
                cpu.cfs_quota_us=150000;
        }
}

However John use all resources of CPU.

It strange for me. But another app was limited. I.e. I think CGroup is worked. But it don't work with John.

I install John via Snap.

If it's possible at all.

0 + 6

server

cgroup

20.04

Archisman Panigrahi

12/27/22, 11:33 AM

Does `OMP_NUM_THREAD=1 command-to-execute-the-program` work?

Bob

12/27/22, 11:46 AM

@ArchismanPanigrahi How can I check it? May be it help - `John the Ripper 1.9.0-jumbo-1 OMP [linux-gnu 64-bit x86_64 AVX2 AC]`. My version of John.

Archisman Panigrahi

12/27/22, 12:16 PM

You can check cpu consumption with system monitor. I don't know the command to execute this program. How do you execute it?

Bob

12/27/22, 12:41 PM

@ArchismanPanigrahi I use `htop`. All of 4 CPU is 100%. `john --test` command line.

Archisman Panigrahi

12/27/22, 12:46 PM

Ok, use the command `OMP_NUM_THREAD=1 john --test`, and check it with `htop`

Bob

12/27/22, 1:15 PM

@ArchismanPanigrahi All the same. :(

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: John the Ripper. How limit CPU with CGroup

TH: จอห์น เดอะ ริปเปอร์. จำกัด CPU ด้วย CGroup อย่างไร

RO: Ioan Spintecătorul. Cum se limitează CPU cu CGroup

RU: Джон Потрошитель. Как ограничить ЦП с помощью CGroup

VI: John the Ripper. Cách giới hạn CPU với CGroup

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