Hi
I have a website for classified. For this I'm using elasticsearch, postgres
and rails on a same ubuntu 14.04 dedicated server, with 256go of RAM and 20
cores, 40 threads .
I have 10 indexes on elasticsearch, each have default numbers of shardes
(5). They have between 1000 and 400 000 classifieds dependings on which
index.
approximatly 5000 requests per minute, 2/3 making an elasticsearch request.
according to htop, jvm is using around 500% of CPU
I try different options, I reduce number of shardes per index, I also try
to change JAVA_OPTS of followed
#JAVA_OPTS="$JAVA_OPTS -XX:+UseParNewGC"
#JAVA_OPTS="$JAVA_OPTS -XX:+UseConcMarkSweepGC"
#JAVA_OPTS="$JAVA_OPTS -XX:CMSInitiatingOccupancyFraction=75"
#JAVA_OPTS="$JAVA_OPTS -XX:+UseCMSInitiatingOccupancyOnly"
JAVA_OPTS="$JAVA_OPTS -XX:+UseG1GC"
but it doesnt seems to change anything.
so to questions :
- when you change any setting on elasticsearch, and then restart, should
the improvement (if any) be visible immediatly or can it arrive a bit later
thanks to cache or any thing else ?
- can any one help me to find good configuration for JVM / elasticsearch so
it will not take that many ressources
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