It does appear that if the global concurrentLevel is not set, that it defaults to # CPUs not 4 * # CPUs as documented here https://apacheignite.readme.io/docs/memory-configuration#section-global-configuration-parameters
private long[] calculateFragmentSizes(int concLvl, long cacheSize, long chpBufSize) { if (concLvl < 2) concLvl = Runtime.getRuntime().availableProcessors(); -- Sent from: http://apache-ignite-users.70518.x6.nabble.com/