View difference between Paste ID: rY3gPVGE and 8LYm2EMj

 #!/bin/bash
 # This line is for starting from mac os icon double click
 cd "$( dirname "$0" )"
 
 # V1.7.1. Minor tweaks:
 # - compile threshold lowered from 3,000 to 300. Oracle's default for servers is 15,000;
 #   my testing fails to show any benefit from this. Faster startup, quicker initial block
 #   breaking, etc.
 # - Initial memory allocation lowered
 # - Clarification to the comments at the end where you select "favor extra space for tenured"
 #   or "favor extra space for new" memory.
 # - MinHeapFreeRatio=21 instead of 20 -- solves a borderline issue where 80% of memory was
 #   used, 20% was free, and repeated full CMS collections were run without expanding memory
 #   allocation to java.
 # - Keep one old GC.log file around.
 # - Changed from "Release Candidate" to "Official first release" :-).
 
 # V1.7: Borderline case existed where memory allocation would be in error.
 # Example: Survivor copy of 90, 90% => Survivor space of 100.
 # Desired Eden of 250.
 # Would attempt to allocate 200 for eden, 200 for two survivors.
 # That's 400 for new, even if "MaxNew" was 350.
 
 # Right behavior in this case?
 # No clear answer.
 # What's more important: making sure you have as much eden as you ask for,
 # or limiting your "new" memory?
 #
 # Answer used here: "new" memory is more important than tenured,
 # as long as tenured is big enough. So, if that happens, we force maxnew up to fit.
 # When this happens, a warning is printed. Pay attention to your logs when this
 # happens -- tenured overflow results in very large amounts of full collections
 # because small collections cannot clear eden.
 
 ## V1.6. This time the 64 bit flag works.
 # Again: This is throwing "too much" memory at eden/survivor.
 # Pay attention to the GC log. Sections like
 
 # 1552.959: [CMS-concurrent-reset-start]
 # 1552.965: [CMS-concurrent-reset: 0.005/0.005 secs] [Times: user=0.00 sys=0.00, real=0.00 secs]
 # {Heap before GC invocations=17 (full 1):
 #  par new generation   total 180224K, used 146721K [0000000009000000, 0000000016c00000, 0000000025200000)
 #   eden space 135168K, 100% used [0000000009000000, 0000000011400000, 0000000011400000)
 #   from space 45056K,  25% used [0000000014000000, 0000000014b48750, 0000000016c00000)
 #   to   space 45056K,   0% used [0000000011400000, 0000000011400000, 0000000014000000)
 #  concurrent mark-sweep generation total 102400K, used 63696K [0000000025200000, 000000002b600000, 000000003b000000)
 #  concurrent-mark-sweep perm gen total 24940K, used 21197K [000000003b000000, 000000003c85b000, 0000000044600000)
 
 # The "CMS-concurrent-reset" means it has finished a full collection.
 # The "concurrent mark-sweep generation" line has the tenured allocation
 # In this case, 63 MB of long-term data.
 
 # Sections like
 
 # 56.089: [GC 56.089: [ParNew
 # Desired survivor size 41523608 bytes, new threshold 4 (max 4)
 # - age   1:   17033216 bytes,   17033216 total
 # - age   2:   22458216 bytes,   39491432 total
 # - age   3:      14552 bytes,   39505984 total
 # - age   4:     136648 bytes,   39642632 total
 
 # 17 MB of temporary space was recently allocated; just under 40 MB of temporaries are "surviving"
 # and not immediately useless. (This comes from startup; almost all of that will be valid for the life
 # of the program run.)
 
 # Age 4 overflows (age 4's total larger than the max, or worse, "new threshold 2" or other small number)
 # means the potential for tenured space to grow unnecessarily. This kills long-term performance.
 
 ## V1.5-corrected: 64 bit version, and ** LOTS OF MEMORY ALLOCATION **
 # This is to give information for data collection.
 # Determine how much your system uses, and then adjust numbers down to avoid waste
 #
 # Specifically: By making the memory pools large, we see how much is used.
 # Then, we can determine what to cut them down to.
 #
 # This will probably be the last CMS version; G1GC next.
 
 java=/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Commands/java
 
 ## V1.4: Java is now customizable (see the above line), thank you oracle for a
 ## java (1.7) that does not support 32 bit servers for reduced memory consumption.
 
 ## 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. (NB: apparently only 1.5 gb on microsoft windows?)
 # 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
 
 JVM_SIZE="-d32 -server"
 # JVM_SIZE="-d64 -XX:+UseCompressedOops -server"
 
 # CMSInitiatingOccupancyFraction: Determine how frequently to do a full CMS
 # Special: New "Most important". This primarily affects long-term growth
 # of the heap. The percentage of used space before CMS starts a collection.
 # 95 is sufficient for general stuff. 85 is useful for things that suddenly
 # need a lot.
 # Dynamic maps, in particular, no longer needs 125 MB of survivor -- it can
 # get by with 60-75. It can go much lower, but then the garbage collections
 # need to be started sooner, or else it will never have enough memory and
 # always grow the heap.
 #
 # To clarify: This is obsolete -- completely -- in G1GC.
 # This needs to be low enough that sudden spurts of temporary memory trigger
 # garbage collection first.
 # This should be re-worked as a "MB safety level" -- for example, if you have
 # 300 MB of tenured, and want at least 30 MB free. But Java don't work that way.
 # As tenured increases, this will also increase the "keep free" level.
 CMSInitiatingOccupancyFraction=80
 
 # Memory tuning:
 # Command line controls total heap, and "new". "Tenured" is the difference.
-MAX=1300
+
 
 # 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.
 
-Tenured=500
+
 # Does not include permanent (byte/compiled code)
-# Most important tuning number. Survivor.
+
 MAX=550
 
 # Tenured: Desired long-term storage space
 # Will vary based on mods, and "loaded chunks"
 # -- how many parties of players close to each other.
 #
-# *** This should be enough for generation 3 95%+ of the time. ***
+
 # of players near each other.
 #
 # That is a guess. Please report what numbers work for your server.
 #
 # ** More testing.
 # Multiple people in the same area: No detectable difference between 1 and 2 people.
 # Actual space needed varied from (LDS minimum) 55 (1.5.1) to 75 (1.4.7, dynamic maps)
 # The old guess of 250 was way too high.
 
 # This will need to be higher on servers with more players.
 Tenured=100
 
 
 # Most important tuning number. Survivor copy size.
 # Making this higher: Fewer full collections, but more wasted space.
 # During startup, expect this to overflow frequently.
 # 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 99%+ of the time. ***
 # ** TOO SMALL WILL KILL YOUR GARBAGE COLLECTION **
 # (worse, it will cause tenured space to grow.)
 # ** TOO BIG WILL WASTE SPACE **
 # (this is a minor issue overall.)
 #
 # To clarify: You can easily use 12 here if you stay primarily in one place.
 # You can even use less, but the memory savings are not significant.
 # Biggest usage I've seen: dimension travel (see below) and dynamic maps with
-# SurvivorCopySize=65
+
-SurvivorCopySize=100
+
 # *** Recommendations
 # If you do a lot of dimension travel -- including using a nether hub to get
 # around, or lots of Mystcraft books (two links to go from A to B in the same
 # world), then you want 65 MB if you can afford it, or 53 MB minimum. That's
 # for one person; groups will be higher.
 # (tested in a world with forests at the hub zone; may be higher for extreme hills,
 # jungles, or jungle-hills (expected to be the worst case.))
 #
 # If you do a lot of high speed rail travel over large distances, a minimum of
 # 40 MB. Ditto if you use a lot of flight mode movement. More if you have a
 # speed boost.
 #
 # If you do very little travel -- if you are just building in one spot -- then
 # 15 MB is plenty.
 #
 # If you are testing a new mod pack, and have no clue what you need, start at 100.
 # If you are working with a multiplayer server, I don't know what to advise --
-# should be less than this 98% of the time.
+
 #
 # More testing: 147, dynamic maps, ocean area: 30
 # 151, jungles/desert/forest: 38
 
 # Probably are good at 32 here
 # Defaulting to 35 MB, works well on a server with extreme hills and no massive dimension
 # travel. Again: Changing dimension once every few minutes won't bother anything. Rapid
 # changing multiple times a minute will.
 
 SurvivorCopySize=35
 
 # 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 (implies lots of block
 # updates), 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
-desiredEden=250
+# should be less than this almost all of the time, at least after startup.
 #
 # 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. Remember, teleportation
 # will raise this value very rapidly.
 #
 # To clarify the problem: An overflow here forces memory into tenured space. If tenured is
 # nearly full -- lets say Java will start a garbage collection soon -- then this can force
 # more space to be allocated to tenured.
 #
 # Forcing more space into tenured is the disaster that this is all about preventing.
 # Tenured space is more expensive to collect, and Java does not release this back to the
 # operating system when it does not need it. This means, on systems that are doing more than
 # just a minecraft server (say, a client, a browser, perhaps voice chat software, etc), this
 # will impact your whole system's performance.
 #
 # A secondary effect of overflow is forcing earlier/more frequent full collections.
 # For single/dual processors, this may be the more dominant factor.
 # For 4/8 core processors, this is minor.
 
 # 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 Survivor. Java requires it to be
 # an integer multiple of Survivor.
 #
 # If you have no idea what to use here, then right at the end
 # there are a pair of commended lines that will calculate
 # something for you. That calculation uses Max, Tenured, and
 # copy, and assumes everything else is new/Eden. Result is a
 # bigger footprint (should always use max or close to it) and
 # the biggest eden space available.
 #
 # Specifying a value here will reduce the starting eden, and
 # give space for tenured to grow later.
 
 desiredEden=30
 
 # Summary: Approximately desiredEden, plus 2 times Survivor,
 # plus 130, 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".
 #
 # 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.)
-# New space is sufficient -- specified eden.
+
 
 # "New" will be Eden plus 2* Survivor.
 
-# borderline case: Not quite the desired eden, we ran into maxnew.
+
-# Disable these; we'd rather raise maxNew for Minecraft.
+
-## NEW=$biggerNew
+
-## RATIO=$MaxRatio
+
 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 $MaxRatio ] )
-START=$(($NEW + 130))
+
 fi
-# 130 MB of tenured space to have Java "happy". Less just results in repeated
+
-# full collections while Java raises the amount of allocated memory.
+
 biggerNew=$(($Survivor * ($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
 
 # Use the user specified Eden. Starting memory footprint will be smaller.
 # Tenured can grow if needed.
 
-	-XX:NewSize=${NEW}m -XX:MaxNewSize=${MaxNew}m \
+
 RATIO=$desiredRatio
 
 # If you have no idea what values to use for Eden, then this will determine
-	-XX:CompileThreshold=3000 \
+# eden values on it's own. This will use your specified tenured, max, and
 # copy values, and assign close to the maximum footprint and eden space.
 
 # NEW=$biggerNew
 # RATIO=$MaxRatio
 
-	-XX:MaxHeapFreeRatio=20 \
+
-	-XX:MinHeapFreeRatio=15 \
+
 then
 	MaxNew=$NEW
 	## CAUTION! "Start" below may fail.
 	## If you get here, then you need to watch out for tenured overflow
-	-jar new_server.jar nogui 151myst10.3
+
 fi
-# The last word of that exec statement -- '151myst10.3' -- is just something that shows up in
+
 START=$(($NEW + 90))
 # Experimal behavior: Starting up, and loading one person into a world, takes
 # about 70-90 MB of tenured space to have Java "happy". Less just results in repeated
 # full collections while Java raises the amount of allocated memory. (Range depends on
 # mods.)
 
 ## TESTME: Does "MaxNewSize" matter if we have adaptive GC boundary? Does it hurt?
 
 # A few more notes ...
 
 # -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.
 
 # -XX:CompileThreshold: Tells Java when to convert bytecode into compiled code.
 # Server defaults to something like 15,000, which is appropriate for something that will
 # run for months, and horrible for something that will run for a few hours.
 # Non-server defaults to ... 1000? 1500? Much lower.
 
 # "-f" prevents an error message on the first run
 mv -f GC.log GC.log.old
 
 exec $java \
 	$JVM_SIZE \
 	-Xms${START}m -Xmx${MAX}m \
 	-XX:+UseAdaptiveGCBoundary \
 	-XX:TargetSurvivorRatio=$TargetSurvivorRatio \
  	-XX:NewSize=${NEW}m -XX:MaxNewSize=${MaxNew}m \
 	-XX:SurvivorRatio=$RATIO \
 	-XX:CompileThreshold=300 \
 	-XX:+UseConcMarkSweepGC -XX:+UseParNewGC \
 	-XX:CMSInitiatingOccupancyFraction=$CMSInitiatingOccupancyFraction \
 \
 	-XX:SoftRefLRUPolicyMSPerMB=0 \
 	-XX:MaxPermSize=150m \
 	-XX:+UseParNewGC \
 	-XX:MaxHeapFreeRatio=25 \
 	-XX:MinHeapFreeRatio=21 \
 	-XX:+DisableExplicitGC \
 	-XX:MaxTenuringThreshold=4 \
 	-XX:+PrintHeapAtGC -XX:+PrintTenuringDistribution \
 	-XX:+PrintCommandLineFlags -XX:+PrintGCDetails -Xloggc:GC.log \
 	-jar new_server.jar nogui 147Main
 
 
 # The last word of that exec statement -- '147Main' -- 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).