ParNewとPSYoungGenはどっちが速いか

New領域のGCは、Parallel (ParNew)とParallel scavenge(PSYoungGen)のどっちが速いか？
・ざっくりと。
・FullGCが起きない程度に
・HashMapにデータを１００万個入れる
・１０回繰り返す

■環境
・Core2Duo 2.93GHz
・Windows7
・jdk1.7.0_05

以下ソース。

package test;

import java.util.HashMap;
import java.util.Map;

public class TestMain {
	private static final int LOOP = 1_000_000;

	public static void main(String[] args) {
		TestMain main = new TestMain();

		StringBuilder sb = new StringBuilder(10000);

		long t0 = System.nanoTime();
		long t1;
		for (int ii = 0; ii < 10; ii++) {
			t1 = System.nanoTime();
			main.exec();
			sb.append(ii + ":" + (System.nanoTime() - t1) + "\n");
		}
		System.out.println(sb.toString());
		System.out.println("total:" + (System.nanoTime() - t0));
	}

	public void exec() {
		Map map = new HashMap(LOOP);

		for (int ii = 0; ii < LOOP; ii++) {
			map.put("k:" + ii, "v:" + ii);
		}
	}
}

■まず、Parallel (ParNew)
-server
-verbose:gc
-XX:+PrintGCDateStamps
-XX:+PrintGCDetails
-Xmx1024m
-Xms1024m
-Xss512k
-XX:NewSize=256m
-XX:MaxNewSize=256m
-XX:SurvivorRatio=2
-XX:MaxTenuringThreshold=32
-XX:TargetSurvivorRatio=90
-XX:+UseParNewGC　　★
-XX:MaxPermSize=128m

2012-06-23T00:58:32.010+0900: [GC [ParNew: 131072K->65534K(196608K), 0.2950717 secs] 131072K->116338K(983040K), 0.2951123 secs] [Times: user=0.59 sys=0.00, real=0.30 secs] 
2012-06-23T00:58:32.442+0900: [GC [ParNew: 196606K->65536K(196608K), 0.2546828 secs] 247410K->151818K(983040K), 0.2547185 secs] [Times: user=0.45 sys=0.02, real=0.25 secs] 
2012-06-23T00:58:32.862+0900: [GC [ParNew: 196608K->65536K(196608K), 0.2216511 secs] 282890K->173930K(983040K), 0.2216886 secs] [Times: user=0.42 sys=0.02, real=0.22 secs] 
2012-06-23T00:58:33.237+0900: [GC [ParNew: 196608K->65536K(196608K), 0.1780971 secs] 305002K->182862K(983040K), 0.1781349 secs] [Times: user=0.34 sys=0.00, real=0.18 secs] 
2012-06-23T00:58:33.573+0900: [GC [ParNew: 196608K->65403K(196608K), 0.1360249 secs] 313934K->183461K(983040K), 0.1360560 secs] [Times: user=0.28 sys=0.00, real=0.14 secs] 
2012-06-23T00:58:33.875+0900: [GC [ParNew: 196475K->65057K(196608K), 0.0998967 secs] 314533K->183704K(983040K), 0.0999300 secs] [Times: user=0.19 sys=0.00, real=0.10 secs] 
2012-06-23T00:58:34.139+0900: [GC [ParNew: 196129K->45883K(196608K), 0.0685596 secs] 314776K->164529K(983040K), 0.0685921 secs] [Times: user=0.13 sys=0.00, real=0.07 secs] 
2012-06-23T00:58:34.377+0900: [GC [ParNew: 176955K->33089K(196608K), 0.0381821 secs] 295601K->151735K(983040K), 0.0382237 secs] [Times: user=0.06 sys=0.00, real=0.04 secs] 
2012-06-23T00:58:34.593+0900: [GC [ParNew: 161912K->4575K(196608K), 0.0007304 secs] 280559K->123222K(983040K), 0.0007552 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] 
2012-06-23T00:58:34.773+0900: [GC [ParNew: 135647K->65536K(196608K), 0.3162099 secs] 254294K->245774K(983040K), 0.3162504 secs] [Times: user=0.64 sys=0.02, real=0.32 secs] 
2012-06-23T00:58:35.214+0900: [GC [ParNew: 190150K->65536K(196608K), 0.2607812 secs] 370389K->288738K(983040K), 0.2608099 secs] [Times: user=0.45 sys=0.05, real=0.26 secs] 

0: 621,252,023
1: 447,146,590
2: 392,406,002
3: 351,912,778
4: 314,922,338
5: 277,398,203
6: 250,419,868
7: 225,968,620
8: 511,571,018
9: 432,212,248
total: 3,825,657,993

■Parallel scavenge(PSYoungGen)
-server
-verbose:gc
-XX:+PrintGCDateStamps
-XX:+PrintGCDetails
-Xmx1024m
-Xms1024m
-Xss512k
-XX:NewSize=256m
-XX:MaxNewSize=256m
-XX:SurvivorRatio=2
-XX:MaxTenuringThreshold=32
-XX:TargetSurvivorRatio=90
-XX:+UseParallelOldGC　　★
-XX:MaxPermSize=128m

2012-06-23T00:57:38.672+0900: [GC [PSYoungGen: 131072K->65521K(196608K)] 131072K->113193K(983040K), 0.2433261 secs] [Times: user=0.48 sys=0.02, real=0.24 secs] 
2012-06-23T00:57:39.105+0900: [GC [PSYoungGen: 196593K->65526K(196608K)] 244265K->137490K(983040K), 0.1997413 secs] [Times: user=0.34 sys=0.03, real=0.20 secs] 
2012-06-23T00:57:39.485+0900: [GC [PSYoungGen: 196598K->65529K(196608K)] 268562K->149521K(983040K), 0.1660447 secs] [Times: user=0.30 sys=0.00, real=0.17 secs] 
2012-06-23T00:57:39.829+0900: [GC [PSYoungGen: 196601K->65065K(196608K)] 280593K->149057K(983040K), 0.1294497 secs] [Times: user=0.27 sys=0.00, real=0.13 secs] 
2012-06-23T00:57:40.138+0900: [GC [PSYoungGen: 196137K->51161K(196608K)] 280129K->135153K(983040K), 0.0979565 secs] [Times: user=0.19 sys=0.00, real=0.10 secs] 
2012-06-23T00:57:40.416+0900: [GC [PSYoungGen: 182233K->37265K(196608K)] 266225K->121257K(983040K), 0.0731753 secs] [Times: user=0.14 sys=0.00, real=0.07 secs] 
2012-06-23T00:57:40.672+0900: [GC [PSYoungGen: 168337K->22976K(196608K)] 252329K->107385K(983040K), 0.0548914 secs] [Times: user=0.11 sys=0.00, real=0.06 secs] 
2012-06-23T00:57:40.909+0900: [GC [PSYoungGen: 154048K->5920K(196608K)] 238457K->93489K(983040K), 0.0188035 secs] [Times: user=0.06 sys=0.00, real=0.02 secs] 
2012-06-23T00:57:41.109+0900: [GC [PSYoungGen: 136992K->65520K(196608K)] 224561K->220825K(983040K), 0.2751759 secs] [Times: user=0.48 sys=0.08, real=0.28 secs] 
2012-06-23T00:57:41.579+0900: [GC [PSYoungGen: 196592K->65520K(196608K)] 351897K->282841K(983040K), 0.2641118 secs] [Times: user=0.50 sys=0.02, real=0.27 secs] 
2012-06-23T00:57:41.985+0900: [GC [PSYoungGen: 196592K->65520K(196608K)] 413913K->330105K(983040K), 0.2270896 secs] [Times: user=0.42 sys=0.03, real=0.23 secs] 

0: 630,066,202
1: 410,310,134
2: 359,207,767
3: 323,152,779
4: 291,122,371
5: 268,608,520
6: 250,793,280
7: 492,386,719
8: 476,318,496
9: 423,822,574
total: 3,926,324,988

■結果
Parallel (ParNew)
　最小　　：225,968,620 ns
　最大　　：511,571,018 ns
　平均　　：355,995,296 ns
　平均偏差： 79,856,594 ns

Parallel scavenge(PSYoungGen)
　最小　　：250,793,280 ns
　最大　　：492,386,719 ns
　平均　　：366,191,404 ns
　平均偏差： 75,127,179 ns
※１回目は解析から除く。

ParNewの方が良いかなー。
安定度はPSYoungGenかなー。