kvlayer_performance tests now have command line options for setting these parameters:

$ kvlayer_performance -c test.yaml --item-size 1024 --num-items-per-batch 40 --num-batch 5

Here's the output from that command for redis:

Running tests on backend "redis"
Testing large writes (200 rows of 1.0 KB)
200 single  rows put=0.1 sec (2760.6 per sec, 2760.6 KB/s)
200 batched rows put=0.0 sec (19197.7 per sec, 19197.7 KB/s)
Testing storage I/O (10000 rows)
10000 rows put=0.8 sec (12792.8 per sec) get=0.2 sec (50085.1 per sec)
parallel 4 workers, 5 batches, 40 items per batch, 1024 bytes per item, 800 inserts (0.7812 MB) written in 1.3 seconds --> 597.0 items/sec, 0.5830 MB/s
parallel 4 workers, 5 batches, 40 items per batch, 1024 bytes per item, 800 items (0.7812 MB) read in 40.8 seconds --> 19.6 items/sec, 0.0191 MB/s