AEM - Collection of JVM Opts From: https://adobe-acs.slack.com/archives/aem-general/p1460662346002618

AEM_JVM_Opts.txt

Standard:
-Xmx -- Increase heap size to 50% total machine ram, or 24gb -- whichever is smaller
-XX:+UseG1GC -- More efficient server GC in Java 8
-XX:+UseAES -XX:+UseAESIntrinsics  -- Use Hardware crypto features for AES if available
-XX:+AggressiveOpts -- Experimental faster JVM tunings
-Djava.awt.headless=true  -- Required for headless unix boxes for Java2D support to work properly
-Djava.io.tmpdir=/tmp -- Recommended to set somewhere with fast i/o

Debugging:
-XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/tmp  -- Used for triaging heap full errors
-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=8000 -- Remote debugging on port 8000

Monitoring (JMX):
-Dcom.sun.management.jmxremote.port=8502     -- Enable JMX on port 8502
-Dcom.sun.management.jmxremote.authenticate=false  -- Set this if no auth is required for JMX (assuming firewalls, etc)
-Dcom.sun.management.jmxremote.ssl=false     -- Recommended as well if used on a VPN or local network

TarMK:
-XX:MaxDirectMemorySize -- Use this to limit how much direct memory is mapped and prevent TarMK from using too much virtual memory

Query-heavy environments:
# https://chl-author.corp.adobe.com/content/help/en/experience-manager/kb/performance-tuning-tips.html
-Doak.queryLimitInMemory=500000 (see also Oak documentation)
-Doak.queryLimitReads=100000 (see also Oak documentation)
-Dupdate.limit=250000
-Doak.fastQuerySize=true

Assets:
-Dsun.java2d.cmm=sun.java2d.cmm.kcms.KcmsServiceProvider -- Switch back to KCMS (Kodac Color management service) in Java 8.  Fixes issues with asset rendition generation in Java 8.