var _running = false
var _tickTimeCost = 0
var _profit = _G('profit') || 0
var _config = {
    orderAmount: ORDER_AMOUNT,
    priceCeil: PRICE_CEIL,
    priceFloor: PRICE_FLOOR,
    maxATR: MAX_ATR,
    profitRate: PROFIT_RATE
}
var _arbitCount = _G('arbit_count') || 0
var _depthHistory = _G('depth_history') || []