Interpreting the output of cassandra-stress

About the output from the running tests.

Each line reports data for the interval between the last elapsed time and current elapsed time, which is set by the --progress-interval option (default 10 seconds).

7251,725,725,56.1,95.1,191.8,10
19523,1227,1227,41.6,86.1,189.1,21
41348,2182,2182,22.5,75.7,176.0,31
...

Data	Description
total	Total number of operations since the start of the test.
interval_op_rate	Number of operations per second performed during the interval.
interval_key_rate	Number of keys/rows read or written per second during the interval (normally be the same as interval_op_rate unless doing range slices).
latency	Average latency in milliseconds for each operation during that interval.
95th	95% of the time the latency was less than the number displayed in the column (Cassandra 1.2 or later).
99th	99% of the time the latency was less than the number displayed in the column (Cassandra 1.2 or later).
elapsed	Number of seconds elapsed since the beginning of the test.