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agent-enviroments/builder/libs/seastar/doc/io-properties-file.md
Sergey Maslenkov 2da60debc0 Добавление Seastar, AMQP-CPP, fmt
2024-09-10 17:06:08 +03:00

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Specifying the I/O properties of a system

The I/O properties of a system can be specified as a YAML string, by using the option --io-properties, or as a YAML file with the option --io-properties-file.

The expected format starts with a map of sections at the top level. Currently only disks is supported.

The disks section

Inside the disks section, the user can specify a list of mount points.

For each mount point, 4 properties have to be specified (none are optional):

  • read_iops: read IOPS speed of the device
  • read_bandwidth: read bandwidth speed of the device
  • write_iops: write IOPS speed of the device
  • write_bandwidth: write bandwidth speed of the device

Additionally the following optional properties can be added:

  • read_saturation_length: read buffer length to saturate the device throughput
  • write_saturation_length: write buffer length to saturate the device throughput

Those quantities can be specified in raw form, or followed with a suffix (k, M, G, or T).

Example:

disks:
  - mountpoint: /var/lib/some_seastar_app
    read_iops: 95000
    read_bandwidth: 545M
    write_iops: 85000
    write_bandwidth: 510M
    write_saturation_length: 64k