Threads per core system properties
- -Ddse.io.aio.enable
-
Set to
falseto have all read operations use theAsynchronousFileChannelregardless of the operating system or disk type.The default setting
trueallows dynamic switching of libraries for read operations as follows:-
LibAIOon solid state drives (SSD) and EXT4/XFS -
AsynchronousFileChannelfor read operations on hard disk drives and all non-Linux operating systems
Use this advanced setting only with guidance from DataStax Support.
-
-
Default:
true - -Ddse.io.aio.force
-
Set to
trueto force all read operations to useLibAIOregardless of the disk type or operating system.Use this advanced setting only with guidance from DataStax Support.
Default:
false - -Dnetty.epoll_check_interval_nanos
-
Sets the granularity for calling an epoll select in nanoseconds, which is a system call. Setting the value too low impacts performance because by making too many system calls. Setting the value too high, impacts performance by delaying the discovery of new events.
Default:
2000 - -Dnetty.eventloop.busy_extra_spins=N
-
Set to the number of iterations in the epoll event loops that are performed when queues are empty before moving on to the next backoff stage. Increasing the value reduces latency while increasing CPU usage when the loops are idle.
Default:
10 - -Dnetty.schedule_check_interval_nanos
-
Set the granularity for checking if scheduled events are ready to execute in nanoseconds. Specifying a value below 1 nanosecond is not productive. Too high a values delays scheduled tasks.
Default:
1000
