Update README.md

README.md

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 The DBMS can be run with 
 
     ./rundb
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+Output
+------
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+txn_cnt: The total number of committed transactions. This number is close to but smaller than THREAD_CNT * MAX_TXN_PER_PART. When any worker thread commits MAX_TXN_PER_PART transactions, all the other worker threads will be terminated. This way, we can measure the steady state throughput where all worker threads are busy.
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+abort_cnt: The total number of aborted transactions. A transaction may abort multiple times before committing. Therefore, abort_cnt can be greater than txn_cnt.
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+run_time: The aggregated transaction execution time (in seconds) across all threads. run_time is approximately the program execution time * THREAD_CNT. Therefore, the per-thread throughput is txn_cnt / run_time and the total throughput is txn_cnt / run_time * THREAD_CNT.
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+time_{wait, ts_alloc, man, index, cleanup, query}: Time spent on different components of DBx1000. All numbers are aggregated across all threads.
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+time_abort: The time spent on transaction executions that eventually aborted.
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+latency: Average latency of transactions.
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