View difference between Paste ID: LwEQJKEa and cR0jz8jA

 #!/bin/bash
 # This line is for starting from mac os icon double click
 cd "$( dirname "$0" )"
 
 ## V1.3: The -XX:SoftRefLRUPolicyMSPerMB=0 flag got lost! Back in now.
 ## This flag defaults to 1000, and can cause memory leaks.
 
 ## V1.2: We now play with -XX:TargetSurvivorRatio=n to reduce waste in new, permitting more
 ## space to be used
 
 # Configurables:
 # -d32 is for heap size up to 2.5gb.
 # Change to "-d64 XX:+UseCompressedOops" if you use more.
 # ** Mention that flag specifically, do not rely on it being autoset.
 # ** Known and documented JVM bug -- https://forums.oracle.com/forums/thread.jspa?messageID=10017916
 
 # CMSInitiatingOccupancyFraction: Determine how frequently to do a full CMS
 # sweep. Lines like:
 # 1308.811: [Full GC (System) ...
 # indicate "CMS failure". This means a full "pause the app and full GC".
 # Too many: Lower the percentage.
 # Too low a percentage: More CMS full sweeps (looks like:)
 # 171.808: [GC [1 CMS-initial-mark: 212329K(367040K)] ...
 # and usually many, many more lines after that, ending with
 # 173.156: [CMS-concurrent-reset: 0.003/0.003 secs] [Times: user=0.00 sys=0.00, real=0.00 secs]
 # Note the time stamps between those.
 
 # -XX:+UseAdaptiveGCBoundary -- apparently, adjust the boundary between new and tenured as needed.
 # Nice to see; did not know about it before.
 # Sadly, it seems to have no effect.
 
 # -XX:+CMSIncrementalMode: Tells the garbage collector to break the job into many small parts.
 # May result in better performance. Essential on systems with few cores.
 
 # Memory tuning:
 # Command line controls total heap, and "new". "Tenured" is the difference.
 # Bigger "new": Less frequent collections.
 
 # These numbers are in "Megabytes", the java "m" suffix.
 
 # The rule of memory tuning:
 # SurvivorSpace * (SurvivorRatio + 2) = New
 # ("SurvivorSpace" is twice the actual surviving threshold.)
 # SurvivorSpace * SurvivorRatio = Eden.
 # Two additional survivor spaces are used to copy surviving objects across minor collections.
 
 # MAX: Maximum heap space used.
 # Does not include permanent (byte/compiled code)
 # Does not include JVM overhead
 MAX=800
 
 # Tenured: Desired long-term storage space
 # Will vary based on mods, and "loaded chunks"
 # -- how many parties of players close to each other.
 #
 # Starting assumption: 250 for 1 person, plus 50 per group
 # of players near each other.
 #
 # That is a guess. Please report what numbers work for your server.
 Tenured=350
 
 # Most important tuning number. Survivor.
 # Making this higher: Fewer full collections, but more wasted space.
 # During startup, expect this to overflow frequently.
 # Dynamic maps wants this at least 100, preferrably 125.
 # Actual space allocated is 2 spaces, each one twice this size.
 # "waste/overhead" will be two about to three times this number.
 # *** Maximum of 1/6rd of "new"
 # Pay attention to the tenuring distribution logs.
 # *** This should be enough for generation 3 95%+ of the time. ***
 # ** TOO SMALL WILL KILL YOUR GARBAGE COLLECTION **
 # ** TOO BIG WILL WASTE SPACE **
 SurvivorCopySize=12
 
 # Survivor target ratio. Java defaults to 50%, which wastes a lot of space. If you know how much
 # you need (see below), you can set this value higher; this gives less waste and "better performance".
 
 TargetSurvivorRatio=90
 
 ## Notes on "SurvivorCopySize":
 # Flying around in creative mode, in already generated chunks will want
 #   at least 30-35, preferrably 40 meg.
 # Standing around, single player, can be happy with less than 1.
 # Even in Mystcraft, with massive amounts of decay everywhere, 95% of the time 1 meg suffices.
 # Moving around a little, doing basic building/digging, about 3.
 #
 # The rule: You want to see "new threshold 4 (max 4)" most of the time.
 # The total value at age three --
 # - age   3:      36712 bytes,    5897520 total
 # should be less than this 95% of the time.
 # 12 meg is more than enough for one person with EBXL, Mystcraft, Twilight Forest,
 # and Custom Ore Gen. Even in EBXL's extreme jungle with Mystcraft's decay littering the ground.
 #
 # The single biggest factor is chunks loaded; that will depend more on parties than on players,
 # and the speed at which they move. Adjust to your server, and your mods.
 #
 # Single player won't need that much. Really.
 
 # Second most important tuning. Eden.
 # Making this bigger means less frequent small collections.
 # General rule: Make this as big as your memory can handle.
 # Must be at least 2x SurvivorCopySize. Java requires it to be
 # an integer multiple of that value.
 
 desiredEden=100
 
 # Summary: Approximately desiredEden, plus 2 times Survivor,
 # plus 100, will be used by java to start the heap. Up to a max of MAX.
 # Script will attempt to ensure at least Tenured space exist;
 # should exit with a message if it cannot.
 #
 # In theory, Java will allocate extra space to new or tenured as needed.
 # In practice, I've never seen it increase "new".
 # ** Update! Just found a config flag conflict, and updated.
 # I suspect I've now gotten it to increase "new" as demand goes up.
 #
 # See the bottom of the config section for more.
 
 # If your shell cannot do math, replace these with an appropriate constant
 
 MaxNew=$(($MAX - $Tenured))
 
 ## Survivor=$((2 * $SurvivorCopySize))
 ## Working with survivor target. "2" is for 50%. For 90%, it's much closer to 1.
 ## What we want is 100 / target percentage, as the ratio instead of 2.
 ## For integer only shell math, we re-write as (100 * survivor) / target, which gives us
 ## close integer to the desired result -- as close as we can get in the shell.
 
 Survivor=$(( ($SurvivorCopySize * 100 ) / $TargetSurvivorRatio ))
 
 ## Equally, the "3" in sanity test is from 3 bins -- two survivors, one eden.
 ## But that does NOT change here -- it's still the sanity test lower limit.
 
 sanityTest=$((3 * $Survivor))
 if [ $sanityTest -gt $MaxNew ]
 then
 	echo Memory config error >& 2
 	exit 1
 fi
 
 # We cannot use more than MaxNew.
 
 # The idea:
 # 1. Find the multiple of Survivor that is bigger than S and less than MN.
 # 2. Determine survivor ratio from that. Subtract 2 (java.)
 # 3. Specify -Xmn for new, and survivor ratio, to set eden and new.
 
 # "New" will be Eden plus 2* Survivor.
 
 # MaxRatio -- what the ratio is if we use all of maxnew.
 MaxRatio=$(( ($MaxNew / $Survivor) - 2 ))
 # DesiredRatio -- what the ratio is based on declared eden space
 # There is no "-2" here -- this will allocate eden plus 2* survivor.
 desiredRatio=$(( ($desiredEden / $Survivor)  ))
 
 # SurvivorSpace * (SurvivorRatio + 2) = New
 
 # Now check for "desired Eden". If survivor is not an exact multiple of DE,
 # then we have just rounded down. Test for this, and if so, see if we can
 # raise it up (watch out for maxnew)
 
 ## TODO! FIXME! This is a cheap approximation
 if ( [ $(( $desiredRatio + 1 )) -le $MaxRatio ] )
 then	desiredRatio=$(( $desiredRatio + 1 ))
 fi
 
 desiredNew=$(($Survivor * ($desiredRatio + 2) ))
 biggerNew=$(($Survivor * ($MaxRatio + 2) ))
 
 echo Debug: Max ratio $MaxRatio, desiredRatio $desiredRatio
 echo Debug: biggerNew $biggerNew, should be less than MaxNew $MaxNew
 echo Debug: desired eden $desiredEden, survivor $Survivor, actual new $desiredNew
 
 # desiredNew: Gives an eden up to, not bigger, than desiredEden.
 # biggerNew: Gives an eden at least as big as desiredEden.
 # FIXME: DesiredNew / ratio should be smallest at least as big as desiredEden
 # This means, if less, then add 1 to ratio and add to new.
 #
 # "Bigger" assigns ALL non-tenured memory to new.
 
 # Q: Desired numbers? Bigger/Max numbers?
 
 # Choose one of these pairs
 
 # New space is small -- specified eden.
 NEW=$desiredNew
 RATIO=$desiredRatio
 
 # Tenured is small -- specified tenured space.
 ## Should Not Be Needed -- "NewSize" and "MaxNewSize" specified separately.
 # In theory, Java should now adjust new as neeed.
 #NEW=$biggerNew
 #RATIO=$MaxRatio
 
 START=$(($NEW + 100))
 
 ## TESTME: Does "MaxNewSize" matter if we have adaptive GC boundary? Does it hurt?
 
 exec java \
 	-d32 -server \
 	-Xms${START}m -Xmx${MAX}m \
 	-XX:NewSize=${NEW}m -XX:MaxNewSize=${MaxNew}m \
 	-XX:+UseAdaptiveGCBoundary \
 	-XX:SurvivorRatio=$RATIO \
 	-XX:TargetSurvivorRatio=$TargetSurvivorRatio \
 	-XX:CompileThreshold=3000 \
         -XX:CMSInitiatingOccupancyFraction=95 \
 \
 	-XX:SoftRefLRUPolicyMSPerMB=0 \
         -XX:MaxPermSize=150m \
 	-XX:+UseConcMarkSweepGC -XX:+UseParNewGC \
 	-XX:MaxHeapFreeRatio=20 \
 	-XX:MinHeapFreeRatio=15 \
 	-XX:MaxTenuringThreshold=4 \
 	-XX:+PrintHeapAtGC -XX:+PrintTenuringDistribution \
 	-XX:+PrintCommandLineFlags -XX:+PrintGCDetails -Xloggc:GC.log \
 	-jar new_server.jar nogui 147test
 
 # The last word of that exec statement -- '147test' -- is just something that shows up in
 # the process list, so I can tell which process is which server (each copy of this script
 # has a different name in that field).