What does autotune log prints Current/Best mean?

A traditional log like this:

Tuning...
[Task  1/12]  Current/Best:  541.83/3570.66 GFLOPS | Progress: (960/2000) | 1001.31 s Done.
[Task  2/12]  Current/Best:    0.56/ 803.33 GFLOPS | Progress: (704/2000) | 608.08 s Done.
[Task  3/12]  Current/Best:  103.69/1141.25 GFLOPS | Progress: (768/2000) | 702.13 s Done.
[Task  4/12]  Current/Best: 2905.03/3925.15 GFLOPS | Progress: (864/2000) | 745.94 sterminate called without an active exception
[Task  4/12]  Current/Best: 2789.36/3925.15 GFLOPS | Progress: (1056/2000) | 929.40 s Done.
[Task  5/12]  Current/Best:   89.06/1076.24 GFLOPS | Progress: (704/2000) | 601.73 s Done.
[Task  6/12]  Current/Best:   40.39/2129.02 GFLOPS | Progress: (1088/2000) | 1125.76 s Done.

what is Current and Best meaning here? Does the GFLOPS bigger is better? Why?

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