为什么 BlkTrace 工具中的 BTT 不报告任何数据

问：

现将报告内容如下：btt

/ssd/blktrace/btt/btt -i parse.bin
==================== All Devices ====================

            ALL           MIN           AVG           MAX           N
--------------- ------------- ------------- ------------- -----------


==================== Device Overhead ====================

       DEV |       Q2G       G2I       Q2M       I2D       D2C
---------- | --------- --------- --------- --------- ---------

==================== Device Merge Information ====================

       DEV |       #Q       #D   Ratio |   BLKmin   BLKavg   BLKmax    Total
---------- | -------- -------- ------- | -------- -------- -------- --------

==================== Device Q2Q Seek Information ====================

       DEV |          NSEEKS            MEAN          MEDIAN | MODE
---------- | --------------- --------------- --------------- | ---------------

==================== Device D2D Seek Information ====================

       DEV |          NSEEKS            MEAN          MEDIAN | MODE
---------- | --------------- --------------- --------------- | ---------------

==================== Plug Information ====================

       DEV |    # Plugs # Timer Us  | % Time Q Plugged
---------- | ---------- ----------  | ----------------

       DEV |    IOs/Unp   IOs/Unp(to)
---------- | ----------   ----------

==================== Active Requests At Q Information ====================

       DEV |  Avg Reqs @ Q
---------- | -------------

==================== I/O Active Period Information ====================

       DEV |     # Live      Avg. Act     Avg. !Act % Live
---------- | ---------- ------------- ------------- ------
---------- | ---------- ------------- ------------- ------
 Total Sys |          0   0.000000000   0.000000000   0.00

我希望可以报告数据，但它没有。btt