[9] RFR (S) 8080012: JVM times out with vdbench on SPARC M7-16 (original) (raw)

Vladimir Kozlov vladimir.kozlov at oracle.com
Thu Jul 2 21:34:55 UTC 2015

The author is Igor Veresov.

http://cr.openjdk.java.net/~kvn/8080012/webrev/

On big SPARC machines (>1k cores) request for cacheline in PICL takes a lot of time since we asking it for each core. PICL daemon can't handle such stream of requests especially when several JVMs start at the same time (vdbench test).

We were told that on sun4v machines (SPARC-T and -M series) you can't have different chips with different cache line size. So we can ask only one core.

I reviewed the fix.

The fix was tested on machine which showed the problem.

Thanks, Vladimir

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