G1 now default in JDK 9

[Mani Sarkar]

Hi all,

I wanted to share these messages with you, as it might be relevant to what you do:

http://hg.openjdk.java.net/jdk9/dev/hotspot/rev/d472d1331479

http://mail.openjdk.java.net/pipermail/hotspot-dev/2015-June/019221.html

There's also an active thread about the same topic on adoption discuss, see http://mail.openjdk.java.net/pipermail/adoption-discuss/2015-July/000914.html.

Your thoughts on it would be nice to have.

Cheers,

Mani

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[Wojciech Kudla]

I'm not entirely convinced default JVM choices matter significantly to people on this list. However, defaults or more precisely their impact heavily contributes to the experience of majority of other JVM users.
I hope it doesn't spoil the the fun for the common programmer.
Having said that, my own experience is G1 may outperform other algos when dealing with larger heaps, but for up to 3-4 gb, UseParallelGC + UseNUMA + numactl still leaves it in the dust if you're after latency in high nines.

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[Kevin Burton]

Some people are still having issues with G1.  There are still bugs in Cassandra and Elasticsearch last I checked...

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[singh.janmejay]

Lucene apparently has trouble with G1. So it will affect Solr as well.

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[Mani Sarkar]

Thanks guys, could you please refer me to any report or blog post of problems due to G1GC.

Thanks.

Cheers,

Mani

[Mani Sarkar]

Hi Janmejay,

Has this been reported back to the OpenJDK / Hotspot teams or is this partly Lucene / Solr issue?

Cheers,
Mani

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[Ben Evans]

Hi Mani,

There's a mail thread about this happening on one of the main OpenJDK lists.

Kirk, in particular, is familiar with the fine detail, and it's a
particularly nasty heisenbug.

Thanks,

Ben

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[Kirk Pepperdine]

Hi all,

Please do let this conversation spill over to the hotspot (hotspot...@openjdk.java.net) mailing list. Without this type of community input the HotSpot team is working in a reality distortion bubble.

Regards,

Kirk

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