Update notes for 2016-12-04

content/post/2016-12.md

@@ -159,3 +159,29 @@ Result = The bitstream could not be found
 - The first one seems ok, but I don't know what to make of the second one...
 - I had a look and there is indeed no file with the second checksum in the assetstore (ie, looking in `[dspace-dir]/assetstore/99/59/30/...`)
 - For what it's worth, there is no item on DSpace Test or S3 backups with that checksum either...
+- In other news, I'm looking at JVM settings from the Solr 4.10.2 release, from `bin/solr.in.sh`:
+
+```
+# These GC settings have shown to work well for a number of common Solr workloads
+GC_TUNE="-XX:-UseSuperWord \
+-XX:NewRatio=3 \
+-XX:SurvivorRatio=4 \
+-XX:TargetSurvivorRatio=90 \
+-XX:MaxTenuringThreshold=8 \
+-XX:+UseConcMarkSweepGC \
+-XX:+UseParNewGC \
+-XX:ConcGCThreads=4 -XX:ParallelGCThreads=4 \
+-XX:+CMSScavengeBeforeRemark \
+-XX:PretenureSizeThreshold=64m \
+-XX:CMSFullGCsBeforeCompaction=1 \
+-XX:+UseCMSInitiatingOccupancyOnly \
+-XX:CMSInitiatingOccupancyFraction=50 \
+-XX:CMSTriggerPermRatio=80 \
+-XX:CMSMaxAbortablePrecleanTime=6000 \
+-XX:+CMSParallelRemarkEnabled \
+-XX:+ParallelRefProcEnabled \
+-XX:+AggressiveOpts"
+```
+
+- I need to try these because they are recommended by the Solr project itself
+- Also, as always, I need to read [Shawn Heisey's wiki page on Solr](https://wiki.apache.org/solr/ShawnHeisey)