TestSleep.jl

function check_sleep(amount)
    start = time()
    sleep(amount)
    final = time()
    delta = final - start
    return delta
end

sum = 0.0
abs(check_sleep(0.020)-0.020) # precompile check_sleep
for i in 1:100
    sum += abs(check_sleep(0.020)-0.020)
end
error = 10 * sum
println("Average error is $error ms.")