--- a/hotspot/test/stress/gc/TestGCOld.java Mon Apr 25 18:07:45 2016 +0300
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,417 +0,0 @@
-/*
-* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
-* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
-*
-* This code is free software; you can redistribute it and/or modify it
-* under the terms of the GNU General Public License version 2 only, as
-* published by the Free Software Foundation.
-*
-* This code is distributed in the hope that it will be useful, but WITHOUT
-* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-* version 2 for more details (a copy is included in the LICENSE file that
-* accompanied this code).
-*
-* You should have received a copy of the GNU General Public License version
-* 2 along with this work; if not, write to the Free Software Foundation,
-* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
-*
-* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
-* or visit www.oracle.com if you need additional information or have any
-* questions.
-*/
-
-/*
- * @test TestGCOld
- * @key gc
- * @key stress
- * @requires vm.gc=="null"
- * @summary Stress the GC by trying to make old objects more likely to be garbage than young objects.
- * @run main/othervm -Xmx384M -XX:+UseSerialGC TestGCOld 50 1 20 10 10000
- * @run main/othervm -Xmx384M -XX:+UseParallelGC TestGCOld 50 1 20 10 10000
- * @run main/othervm -Xmx384M -XX:+UseParallelGC -XX:-UseParallelOldGC TestGCOld 50 1 20 10 10000
- * @run main/othervm -Xmx384M -XX:+UseConcMarkSweepGC TestGCOld 50 1 20 10 10000
- * @run main/othervm -Xmx384M -XX:+UseG1GC TestGCOld 50 1 20 10 10000
- */
-
-import java.text.*;
-import java.util.Random;
-
-class TreeNode {
- public TreeNode left, right;
- public int val; // will always be the height of the tree
-}
-
-
-/* Args:
- live-data-size: in megabytes (approximate, will be rounded down).
- work: units of mutator non-allocation work per byte allocated,
- (in unspecified units. This will affect the promotion rate
- printed at the end of the run: more mutator work per step implies
- fewer steps per second implies fewer bytes promoted per second.)
- short/long ratio: ratio of short-lived bytes allocated to long-lived
- bytes allocated.
- pointer mutation rate: number of pointer mutations per step.
- steps: number of steps to do.
-*/
-
-public class TestGCOld {
-
- // Command-line parameters.
-
- private static int size, workUnits, promoteRate, ptrMutRate, steps;
-
- // Constants.
-
- private static final int MEG = 1000000;
- private static final int INSIGNIFICANT = 999; // this many bytes don't matter
- private static final int BYTES_PER_WORD = 4;
- private static final int BYTES_PER_NODE = 20; // bytes per TreeNode
- private static final int WORDS_DEAD = 100; // size of young garbage object
-
- private final static int treeHeight = 14;
- private final static long treeSize = heightToBytes(treeHeight);
-
- private static final String msg1
- = "Usage: java TestGCOld <size> <work> <ratio> <mutation> <steps>";
- private static final String msg2
- = " where <size> is the live storage in megabytes";
- private static final String msg3
- = " <work> is the mutator work per step (arbitrary units)";
- private static final String msg4
- = " <ratio> is the ratio of short-lived to long-lived allocation";
- private static final String msg5
- = " <mutation> is the mutations per step";
- private static final String msg6
- = " <steps> is the number of steps";
-
- // Counters (and global variables that discourage optimization)
-
- private static long youngBytes = 0; // total young bytes allocated
- private static long nodes = 0; // total tree nodes allocated
- private static long actuallyMut = 0; // pointer mutations in old trees
- private static long mutatorSum = 0; // checksum to discourage optimization
- public static int[] aexport; // exported array to discourage opt
-
- // Global variables.
-
- private static TreeNode[] trees;
- private static int where = 0; // roving index into trees
- private static Random rnd = new Random();
-
- // Returns the height of the given tree.
-
- private static int height (TreeNode t) {
- if (t == null) {
- return 0;
- }
- else {
- return 1 + Math.max (height (t.left), height (t.right));
- }
- }
-
- // Returns the length of the shortest path in the given tree.
-
- private static int shortestPath (TreeNode t) {
- if (t == null) {
- return 0;
- }
- else {
- return 1 + Math.min (shortestPath (t.left), shortestPath (t.right));
- }
- }
-
- // Returns the number of nodes in a balanced tree of the given height.
-
- private static long heightToNodes (int h) {
- if (h == 0) {
- return 0;
- }
- else {
- long n = 1;
- while (h > 1) {
- n = n + n;
- h = h - 1;
- }
- return n + n - 1;
- }
- }
-
- // Returns the number of bytes in a balanced tree of the given height.
-
- private static long heightToBytes (int h) {
- return BYTES_PER_NODE * heightToNodes (h);
- }
-
- // Returns the height of the largest balanced tree
- // that has no more than the given number of nodes.
-
- private static int nodesToHeight (long nodes) {
- int h = 1;
- long n = 1;
- while (n + n - 1 <= nodes) {
- n = n + n;
- h = h + 1;
- }
- return h - 1;
- }
-
- // Returns the height of the largest balanced tree
- // that occupies no more than the given number of bytes.
-
- private static int bytesToHeight (long bytes) {
- return nodesToHeight (bytes / BYTES_PER_NODE);
- }
-
- // Returns a newly allocated balanced binary tree of height h.
-
- private static TreeNode makeTree(int h) {
- if (h == 0) return null;
- else {
- TreeNode res = new TreeNode();
- nodes++;
- res.left = makeTree(h-1);
- res.right = makeTree(h-1);
- res.val = h;
- return res;
- }
- }
-
- // Allocates approximately size megabytes of trees and stores
- // them into a global array.
-
- private static void init() {
- int ntrees = (int) ((size * MEG) / treeSize);
- trees = new TreeNode[ntrees];
-
- System.err.println("Allocating " + ntrees + " trees.");
- System.err.println(" (" + (ntrees * treeSize) + " bytes)");
- for (int i = 0; i < ntrees; i++) {
- trees[i] = makeTree(treeHeight);
- // doYoungGenAlloc(promoteRate*ntrees*treeSize, WORDS_DEAD);
- }
- System.err.println(" (" + nodes + " nodes)");
-
- /* Allow any in-progress GC to catch up... */
- // try { Thread.sleep(20000); } catch (InterruptedException x) {}
- }
-
- // Confirms that all trees are balanced and have the correct height.
-
- private static void checkTrees() {
- int ntrees = trees.length;
- for (int i = 0; i < ntrees; i++) {
- TreeNode t = trees[i];
- int h1 = height(t);
- int h2 = shortestPath(t);
- if ((h1 != treeHeight) || (h2 != treeHeight)) {
- System.err.println("*****BUG: " + h1 + " " + h2);
- }
- }
- }
-
- // Called only by replaceTree (below) and by itself.
-
- private static void replaceTreeWork(TreeNode full, TreeNode partial, boolean dir) {
- boolean canGoLeft = full.left != null && full.left.val > partial.val;
- boolean canGoRight = full.right != null && full.right.val > partial.val;
- if (canGoLeft && canGoRight) {
- if (dir)
- replaceTreeWork(full.left, partial, !dir);
- else
- replaceTreeWork(full.right, partial, !dir);
- } else if (!canGoLeft && !canGoRight) {
- if (dir)
- full.left = partial;
- else
- full.right = partial;
- } else if (!canGoLeft) {
- full.left = partial;
- } else {
- full.right = partial;
- }
- }
-
- // Given a balanced tree full and a smaller balanced tree partial,
- // replaces an appropriate subtree of full by partial, taking care
- // to preserve the shape of the full tree.
-
- private static void replaceTree(TreeNode full, TreeNode partial) {
- boolean dir = (partial.val % 2) == 0;
- actuallyMut++;
- replaceTreeWork(full, partial, dir);
- }
-
- // Allocates approximately n bytes of long-lived storage,
- // replacing oldest existing long-lived storage.
-
- private static void oldGenAlloc(long n) {
- int full = (int) (n / treeSize);
- long partial = n % treeSize;
- // System.out.println("In oldGenAlloc, doing " + full + " full trees "
- // + "and one partial tree of size " + partial);
- for (int i = 0; i < full; i++) {
- trees[where++] = makeTree(treeHeight);
- if (where == trees.length) where = 0;
- }
- while (partial > INSIGNIFICANT) {
- int h = bytesToHeight(partial);
- TreeNode newTree = makeTree(h);
- replaceTree(trees[where++], newTree);
- if (where == trees.length) where = 0;
- partial = partial - heightToBytes(h);
- }
- }
-
- // Interchanges two randomly selected subtrees (of same size and depth).
-
- private static void oldGenSwapSubtrees() {
- // Randomly pick:
- // * two tree indices
- // * A depth
- // * A path to that depth.
- int index1 = rnd.nextInt(trees.length);
- int index2 = rnd.nextInt(trees.length);
- int depth = rnd.nextInt(treeHeight);
- int path = rnd.nextInt();
- TreeNode tn1 = trees[index1];
- TreeNode tn2 = trees[index2];
- for (int i = 0; i < depth; i++) {
- if ((path & 1) == 0) {
- tn1 = tn1.left;
- tn2 = tn2.left;
- } else {
- tn1 = tn1.right;
- tn2 = tn2.right;
- }
- path >>= 1;
- }
- TreeNode tmp;
- if ((path & 1) == 0) {
- tmp = tn1.left;
- tn1.left = tn2.left;
- tn2.left = tmp;
- } else {
- tmp = tn1.right;
- tn1.right = tn2.right;
- tn2.right = tmp;
- }
- actuallyMut += 2;
- }
-
- // Update "n" old-generation pointers.
-
- private static void oldGenMut(long n) {
- for (int i = 0; i < n/2; i++) {
- oldGenSwapSubtrees();
- }
- }
-
- // Does the amount of mutator work appropriate for n bytes of young-gen
- // garbage allocation.
-
- private static void doMutWork(long n) {
- int sum = 0;
- long limit = workUnits*n/10;
- for (long k = 0; k < limit; k++) sum++;
- // We don't want dead code elimination to eliminate the loop above.
- mutatorSum = mutatorSum + sum;
- }
-
- // Allocate n bytes of young-gen garbage, in units of "nwords"
- // words.
-
- private static void doYoungGenAlloc(long n, int nwords) {
- final int nbytes = nwords*BYTES_PER_WORD;
- int allocated = 0;
- while (allocated < n) {
- aexport = new int[nwords];
- /* System.err.println("Step"); */
- allocated += nbytes;
- }
- youngBytes = youngBytes + allocated;
- }
-
- // Allocate "n" bytes of young-gen data; and do the
- // corresponding amount of old-gen allocation and pointer
- // mutation.
-
- // oldGenAlloc may perform some mutations, so this code
- // takes those mutations into account.
-
- private static void doStep(long n) {
- long mutations = actuallyMut;
-
- doYoungGenAlloc(n, WORDS_DEAD);
- doMutWork(n);
- oldGenAlloc(n / promoteRate);
- oldGenMut(Math.max(0L, (mutations + ptrMutRate) - actuallyMut));
- }
-
- public static void main(String[] args) {
- if (args.length != 5) {
- System.err.println(msg1);
- System.err.println(msg2);
- System.err.println(msg3);
- System.err.println(msg4);
- System.err.println(msg5);
- System.err.println(msg6);
- return;
- }
-
- size = Integer.parseInt(args[0]);
- workUnits = Integer.parseInt(args[1]);
- promoteRate = Integer.parseInt(args[2]);
- ptrMutRate = Integer.parseInt(args[3]);
- steps = Integer.parseInt(args[4]);
-
- System.out.println(size + " megabytes of live storage");
- System.out.println(workUnits + " work units per step");
- System.out.println("promotion ratio is 1:" + promoteRate);
- System.out.println("pointer mutation rate is " + ptrMutRate);
- System.out.println(steps + " steps");
-
- init();
-// checkTrees();
- youngBytes = 0;
- nodes = 0;
-
- System.err.println("Initialization complete...");
-
- long start = System.currentTimeMillis();
-
- for (int step = 0; step < steps; step++) {
- doStep(MEG);
- }
-
- long end = System.currentTimeMillis();
- float secs = ((float)(end-start))/1000.0F;
-
-// checkTrees();
-
- NumberFormat nf = NumberFormat.getInstance();
- nf.setMaximumFractionDigits(1);
- System.out.println("\nTook " + nf.format(secs) + " sec in steady state.");
- nf.setMaximumFractionDigits(2);
- System.out.println("Allocated " + steps + " Mb of young gen garbage"
- + " (= " + nf.format(((float)steps)/secs) +
- " Mb/sec)");
- System.out.println(" (actually allocated " +
- nf.format(((float) youngBytes)/MEG) + " megabytes)");
- float promoted = ((float)steps) / (float)promoteRate;
- System.out.println("Promoted " + promoted +
- " Mb (= " + nf.format(promoted/secs) + " Mb/sec)");
- System.out.println(" (actually promoted " +
- nf.format(((float) (nodes * BYTES_PER_NODE))/MEG) +
- " megabytes)");
- if (ptrMutRate != 0) {
- System.out.println("Mutated " + actuallyMut +
- " pointers (= " +
- nf.format(actuallyMut/secs) + " ptrs/sec)");
-
- }
- // This output serves mainly to discourage optimization.
- System.out.println("Checksum = " + (mutatorSum + aexport.length));
-
- }
-}