fix aio perf test as the index value is referenced and changed to invalid value
fix aio perf test as the index value is referenced and changed to invalid value

imzhenyu/rDSN,qinzuoyan/rDSN,imzhenyu/rDSN,imzhenyu/rDSN,Microsoft/rDSN,qinzuoyan/rDSN,Microsoft/rDSN,imzhenyu/rDSN,imzhenyu/rDSN,imzhenyu/rDSN,imzhenyu/rDSN,Microsoft/rDSN,qinzuoyan/rDSN,imzhenyu/rDSN,qinzuoyan/rDSN,Microsoft/rDSN,qinzuoyan/rDSN,Microsoft/rDSN,qinzuoyan/rDSN,Microsoft/rDSN,qinzuoyan/rDSN,Microsoft/rDSN,qinzuoyan/rDSN,Microsoft/rDSN