==ReadNCache JMeter function Use it for read files as ${__FileToString()} and cache it into Concurrent LRU cache. Example: ${__FileToString("/tmp/dataset.txt",,)} --> ${__ReadNCache("/tmp/dataset.txt")} To control LRU cache use options: // Capacity of LRU Cache. Default is 1000 jmeter.readncache.capacity=1000 // Concurrency level of LRU Cache. Default is 16 jmeter.readncache.concurrency_level=16