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Galo

Galo

Jan
30

How does the default hashCode() work? (and why does it affect biased locking?)

In which scratching the surface of hashCode() leads to a speleology trip through the JVM source reaching object layout, biased locking, and surprising performance implications of relying on the default hashCode().
11 min read
Aug
28

Contention on sun.misc.Cleaner

I found recently a (dying) JVM with about 10 threads BLOCKED on the sun.misc.Cleaner class instance. This was not the root cause of the failure, but I could learn something by looking into those blocks.
3 min read
Jun
25

How does the JVM change tenuring thresholds, and when?

On a recent Tuesday evening I ran into this 3 year old JVM question in Stack Overflow. GC features and
1 min read