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PO

A D A

J K

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P M

P P

P

, , ()

15/9/2012 A 2

P

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CPG

, (/L)

()

M, P M ()

, , ,

()

()

15/9/2012 A 3

O P M

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M ()P M, ()

N, ()

I/O, . ()

O (), (), ,

15/9/2012 A 4

O P M(.)

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M

C

L : / , / .

M

C /

L

15/9/2012 A 5

P P P

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M O P A, HPJM,JM F: :==, ..., ,

J A

C: JP, OI!, JP, K M

O P A HPJM

JM

JM G JC, J F, M D, K

15/9/2012 A 6

P P P

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A J NB CP

D

B 1500

(1 CP 1.062 GH PAC, 1 GBAM)

A

15/9/2012 A 7

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1)

A GC H

2) P 3) I 4) O 5) P &

6) I 7) 1

15/9/2012 A 8

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CP P M

15/9/2012 A 9

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15/9/2012 A 10

M M

N CP: 27%

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15/9/2012 A 11

M M

P & CP: 64%

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CP P P

15/9/2012 A 12

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15/9/2012 A 13

I H 1E & CP

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15/9/2012 A 14

I H 2

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15/9/2012 A 15

D H 2

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15/9/2012 A 16

D H 2 (.)

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15/9/2012 A 18

I H 2 (.)

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CP P

15/9/2012 A 19

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15/9/2012 A 20

P

CP: 60%

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15/9/2012 A 21

P

CP: 50%

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15/9/2012 A 22

P 1

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15/9/2012 A 23

P 2

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M PP/

G CP GC

15/9/2012 A 24

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N G GC O G GC

Copying collector (< Java 5):+GC

Mark-Sweep collector (< Java 5):+GC

Parallel copying collector ( Java 5):+PNGC

Parallel Scavenge MarkSweep collector:+POGC

Parallel scavenge collector ( Java 5,>10GB heap space):+PGC

Concurrent Mark Sweep collector( Java 6):+CMGC

G1 young generation ( Java 7)

:+G1GC

G1 mixed generation ( Java 7)

:+G1GC15/9/2012 A 25

G &G C

E 1 2

N G

P

O G

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-Xmx = -Xms

XX:PermSize = XX:MaxPermSize

-Xmn XX:NewSize XX:MaxNewSize

D XX:-UseAdaptiveSizePolicy

XX:SurvivorRatio

XX:+UseConcMarkSweepGC

40

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run.args.extra =

-Xms256m -Xmx768m -Xincgc

-XX:+UseConcMarkSweepGC

-XX:SurvivorRatio=3XX:-UseAdaptiveSizePolicy

-XX:CMSInitiatingOccupancyFraction=60

XX:+UseCMSInitiatingOccupancyOnly

15/9/2012 A 27

A

M

I

E=76,8 M,1,2= 25,6 M

CM: C M

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15/9/2012 A 28

HPJM

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15/9/2012 A 29

HPJM

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15/9/2012 A 30

HPJM

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15/9/2012 A 31

HPJM

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15/9/2012 A 32

HPJM

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P/

?

15/9/2012 A 33

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H C. & J B. (2011), P HK H. (2011), ://../?=GQAL9K://../2012/03/

1.://..//1.

://..////

/140102.

15/9/2012 A 34

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Q

15/9/2012 35A

?