Hi Aleksey, On Tue, 2020-05-26 at 09:50 +0200, Aleksey Shipilev wrote:

RFE: https://bugs.openjdk.java.net/browse/JDK-8245720

As the follow up of JDK-8244817 for Shenandoah GC, it makes sense to enable Shenandoah to print similar info. Example output:

[0.006s][info][gc] Using Shenandoah [0.006s][info][gc] Heuristics ergonomically sets -XX:+ExplicitGCInvokesConcurrent [0.006s][info][gc] Heuristics ergonomically sets -XX:+ShenandoahImplicitGCInvokesConcurrent [0.360s][info][gc,init] Version: 15-internal+0-adhoc.shade.jdk-jdk (fastdebug) [0.360s][info][gc,init] CPUs: 16 total, 16 available [0.360s][info][gc,init] Memory: 125G [0.360s][info][gc,init] Large Page Support: Disabled [0.360s][info][gc,init] NUMA Support: Disabled [0.360s][info][gc,init] Compressed Oops: Enabled (Zero based) [0.360s][info][gc,init] Heap Min Capacity: 1G [0.360s][info][gc,init] Heap Initial Capacity: 1G [0.360s][info][gc,init] Heap Max Capacity: 10G [0.360s][info][gc,init] Pre-touch: Disabled [0.360s][info][gc,init] Mode: Snapshot-At-The-Beginning (SATB) [0.360s][info][gc,init] Heuristics: Adaptive [0.360s][info][gc,init] Heap Region Count: 2560 [0.360s][info][gc,init] Heap Region Size: 4M [0.360s][info][gc,init] TLAB Size Max: 4M [0.360s][info][gc,init] Humongous Object Threshold: 4M [0.360s][info][gc,init] Reference Processing: Parallel discovery, Parallel processing [0.360s][info][gc,init] Parallel Workers: 8 [0.360s][info][gc,init] Concurrent Workers: 4 Ready

I like this 'Ready', kinda retro thing as in: https://www.c64-wiki.de/images/2/28/fehlermeldung_syntax.png

I am thinking to just inline the upstream superclass InitLogger into ShenandoahInitLogger when backporting this to 11u and 8u.

Webrev: https://cr.openjdk.java.net/~shade/8245720/webrev.01/

Testing: hotspot_gc_shenandoah

Looks good! Thanks, Roman