Unable to find 5 sec slot timing in code base

Question

I was trying to understand the stellar code base and was looking for a place where 5 sec slot timing is hardcoded (if I am not wrong). But unable to find that, instead in ovalayManagerImpl.cpp file I found that timer elapsed at every 2 sec.

mTimer.expires_from_now(std::chrono::seconds(2));

Am I looking at incorrect file? Also, my second question is what is the rational behind the 5 sec slot timing ?

Answer 1

I found method which returns the expected ledger closing time,

std::chrono::seconds
Config::getExpectedLedgerCloseTime() const
{
    if (ARTIFICIALLY_SET_CLOSE_TIME_FOR_TESTING)
    {
        return std::chrono::seconds{ARTIFICIALLY_SET_CLOSE_TIME_FOR_TESTING};
    }
    if (ARTIFICIALLY_ACCELERATE_TIME_FOR_TESTING)
    {
        return std::chrono::seconds{1};
    }
    return Herder::EXP_LEDGER_TIMESPAN_SECONDS;
}

and the value for EXP_LEDGER_TIMESPAN_SECONDS is set to 5 sec - std::chrono::seconds const Herder::EXP_LEDGER_TIMESPAN_SECONDS(5);