High CPU usage through context switches in Akka application
The problem is that Fazecast's jSerialComm library has a number of different time-out modes.
static final public int TIMEOUT_NONBLOCKING = 0x00000000;static final public int TIMEOUT_READ_SEMI_BLOCKING = 0x00000001;static final public int TIMEOUT_WRITE_SEMI_BLOCKING = 0x00000010;static final public int TIMEOUT_READ_BLOCKING = 0x00000100;static final public int TIMEOUT_WRITE_BLOCKING = 0x00001000;static final public int TIMEOUT_SCANNER = 0x00010000;Using the non blocking read() method (TIMEOUT_NONBLOCKING) results in a very high CPU usage when combined with the Akka Stream's InputStreamPublisher. To prevent this simply use TIMEOUT_READ_SEMI_BLOCKING or TIMEOUT_READ_BLOCKING.