JVM G1生存空間容量爲0

考慮以下JVM設置：JVM G1生存空間容量爲0

-d64 -server -Xms40g -Xmx40g -XX:+UseG1GC -XX:NewRatio=1 -XX:G1ReservePercent=10 -XX:MaxGCPauseMillis=100 -XX:InitiatingHeapOccupancyPercent=30 -verbose:gc -Xloggc:/var/log/gc_solr.log -XX:PermSize=728m -XX:MaxPermSize=728m

JMAP給出如下：

Heap Configuration: 
    MinHeapFreeRatio = 40 
    MaxHeapFreeRatio = 70 
    MaxHeapSize  = 42949672960 (40960.0MB) 
    NewSize   = 1363144 (1.2999954223632812MB) 
    MaxNewSize  = 17592186044415 MB 
    OldSize   = 5452592 (5.1999969482421875MB) 
    NewRatio   = 1 
    SurvivorRatio = 8 
    PermSize   = 754974720 (720.0MB) 
    MaxPermSize  = 763363328 (728.0MB) 
    G1HeapRegionSize = 16777216 (16.0MB) 

Heap Usage: 
G1 Heap: 
    regions = 2560 
    capacity = 42949672960 (40960.0MB) 
    used  = 100663296 (96.0MB) 
    free  = 42849009664 (40864.0MB) 
    0.234375% used 
G1 Young Generation: 
Eden Space: 
    regions = 6 
    capacity = 22548578304 (21504.0MB) 
    used  = 100663296 (96.0MB) 
    free  = 22447915008 (21408.0MB) 
    0.44642857142857145% used 
Survivor Space: 
    regions = 0 
    capacity = 0 (0.0MB) 
    used  = 0 (0.0MB) 
    free  = 0 (0.0MB) 
    0.0% used 
G1 Old Generation: 
    regions = 0 
    capacity = 20401094656 (19456.0MB) 
    used  = 0 (0.0MB) 
    free  = 20401094656 (19456.0MB) 
    0.0% used 
Perm Generation: 
    capacity = 754974720 (720.0MB) 
    used  = 21380584 (20.390113830566406MB) 
    free  = 733594136 (699.6098861694336MB) 
    2.831960254245334% used

我不明白爲什麼倖存者空間容量爲0？

我嘗試過不同的NewRatio/SurvivorRatio組合，但沒有太大的成功。

倖存者空間依賴於什麼？我認爲這應該是伊甸園空間的一個比例。

來源

2013-04-10 ttux

所以最後它很簡單。應用程序開始使用時顯示倖存者空間的容量。

這很令人困惑......

來源

2013-04-10 14:48:01 ttux

JVM G1生存空間容量爲0

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