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CPUSET in the /etc/scylla.d/cpuset.conf file is automatically configured by running the scylla_setup
(or scylla_cpuset_setup) script. If you want to customize CPUSET, you must modify both the cpuset.conf
and perftune.yaml files.
Note that the scylla-server service will generate /etc/scylla.d/perftune.yaml only if the file doesn’t exist.
Here are a few examples of possible configurations. In the examples, eth5 is used as a NIC name and /var/lib/scylla as a data directory.
16 CPUs system.
You want to run Scylla on CPUs 3, 4, 5, and have IRQs handled on the same CPUs, while allowing other apps on the same machine to benefit
from XFS/RFS/RPS from eth5.
cpuset.conf:
CPUSET="--cpuset 3,4,5 "
perftune.yaml:
cpu_mask: '0xffff'
dir:
- /var/lib/scylla
irq_cpu_mask: '0x38'
nic:
- eth5
tune:
- net
- disks
16 CPUs system.
You want to run Scylla on CPUs 3, 4, 5, and have IRQs handled on the same CPUs, and Scylla is going to be the only application
that will use eth5.
cpuset.conf:
CPUSET="--cpuset 3,4,5 "
perftune.yaml:
cpu_mask: '0x38'
dir:
- /var/lib/scylla
irq_cpu_mask: '0x38'
nic:
- eth5
tune:
- net
- disks
16 CPUs system.
You want to run Scylla on CPUs 3, 4, 5, and IRQs handled on CPUs 6,7,8, while allowing other apps on the same machine to benefit
from XFS/RFS/RPS from eth5.
cpuset.conf:
CPUSET="--cpuset 3,4,5 "
perftune.yaml:
cpu_mask: '0xffff'
dir:
- /var/lib/scylla
irq_cpu_mask: '0x1c0'
nic:
- eth5
tune:
- net
- disks
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