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Answer the number of scavenges that an object must on average survive before being promoted to oldspace; this is however only an estimate because objects that are reachable from oldspace have a higher probability to be tenured soon, while objects that are only reachable from thisContext have a lower probability to be tenured. Anyway, if this number falls below 2-3 you should definitely increment the size of eden and/or of survivor space, because you are tenuring too often and relying too much on global garbage collection to keep your heap clean; do the measurement on a restarted image, so that the extra tenuring incurred when creating long-lived objects such as classes or methods is not considered.