Performance issue on high thread count scenarios

[loadtestingru]

During load test with about 2k threads about 30% of all threads are blocked at:
com.github.johrstrom.collector.JMeterCollectorRegistry#getOrCreateAndRegister(BaseCollectorConfig cfg)

What is thre reason here to use synchronized method?
registered is alread ConcurrentHashMap.

You can use registered.computeIfAbsent(BaseCollectorConfig key, Function<BaseCollectorConfig, Collector> mappingFunction)
And threads will not be blocked on each method call after first key creation.

[johrstrom]

Hi! Thanks for the issue and the potential fix. I however, don't actively maintain this much anymore so am unlikely to do the work. Happy to evaluate and potentially merge a pull request though!