presto-main/src/main/java/io/prestosql/execution/resourcegroups/InternalResourceGroup.java/InternalResourceGroup/setCpuQuotaGenerationMillisPerSecond
class InternalResourceGroup:    @Override
    public void setCpuQuotaGenerationMillisPerSecond(long rate)
    {
        checkArgument(rate > 0, "Cpu quota generation must be positive");
        synchronized (root) {
            cpuQuotaGenerationMillisPerSecond = rate;
        }
    }