4 ms·

Thanks for that reference. Do you know if the JVM still uses thin locks? Did they migrate to thin locks? I ask because I found a 9 year old reference with a JVM

by aktau 1y ago

Thanks for that reference. Do you know if the JVM still uses thin locks? Did they migrate to thin locks? I ask because I found a 9 year old reference with a JVM calling futex: https://stackoverflow.com/questions/32262946/java-periodically-hangs-at-futex-and-very-low-io-output https://stackoverflow.com/questions/32262946/java-periodical....

pizlonator 1y ago
OpenJDK has used thin locks since back when it was called HotSpot. The fact that the JVM is hanging in futexes doesn’t meant anything for the purpose of this discussion. Futexes are _the_ OS locking primitive on Linux so I would expect modern JVM thin locks to bottom out in a futex syscall. That doesn’t mean that the JVM is “using” futexes in the sense of the original post.