We use the G1 collector in Java 8u131 and it works well. We are running 6.6.2. 
Our Solr instances do a LOT of allocation. We have long queries (25 terms 
average) and many unique queries.

SOLR_HEAP=8g
# Use G1 GC  -- wunder 2017-01-23
# Settings from https://wiki.apache.org/solr/ShawnHeisey
GC_TUNE=" \
-XX:+UseG1GC \
-XX:+ParallelRefProcEnabled \
-XX:G1HeapRegionSize=8m \
-XX:MaxGCPauseMillis=200 \
-XX:+UseLargePages \
-XX:+AggressiveOpts \
"

wunder
Walter Underwood
wun...@wunderwood.org
http://observer.wunderwood.org/  (my blog)

> On Mar 26, 2018, at 1:22 AM, Derek Poh <d...@globalsources.com> wrote:
> 
> Hi
> 
> From your experience, would like to know if It is advisable to change the gc 
> parameters in solr.in.sh or solrfile?
> It is mentioned in the documentation to edit solr.in.sh but would like toknow 
> which file you actually edit.
> 
> I am using Solr 6.6.2at the moment.
> 
> Regards,
> Derek
> 
> 
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