Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/1387#issuecomment-49072778
@witgo the problem is that there's no reliable way to make sure the gc has
run. Have you tried with all available gcs in the Oracle vm? Have you tried
with different vms? I've actually worked on a JVM where `System.gc()` was
actually a no-op. In that situation your `runGC()` method might take a really
long time to finish, if it ever does.
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