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Former Member

Concurrent mode failure

Hello All. <BR>

I run SAP EP 7.0 on SUN Java SDK 1.4.2_26.<BR>

I have "concurrent mode failure" in java log very often.<BR>

68337.513: [GC 68337.514: [ParNew: 391873K->130816K(392448K), 7.4904532 secs] 2344905K->2216563K(3014912K), 7.4910130 secs]<BR>

68348.738: [GC 68348.738: [ParNew: 392448K->130816K(392448K), 7.4296165 secs] 2478195K->2349900K(3014912K), 7.4301873 secs]<BR>

68360.159: [GC 68360.160: [ParNew: 392448K->118557K(392448K), 7.6382380 secs] 2611532K->2467563K(3014912K), 7.6387969 secs]<BR>

68371.590: [GC 68371.591: [ParNew: 380189K->130816K(392448K), 7.4497681 secs] 2729195K->2569702K(3014912K), 7.4503172 secs]<BR>

68382.937: [GC 68382.938: [ParNew (promotion failed): 392448K->392448K(392448K), 22.3198666 secs]

68405.258: [CMS68414.474: [CMS-concurrent-mark: 28.298/80.683 secs]<BR>

(concurrent mode failure): 2528895K->2363051K(2622464K), 66.5178202 secs] 2831334K->2363051K(3014912K), 88.8385694 secs]<BR>

68472.837: [GC [1 CMS-initial-mark: 2363051K(2622464K)] 2448031K(3014912K), 0.6174037 secs]<BR>

68473.455: [CMS-concurrent-mark-start]<BR>

68475.990: [GC 68475.990: [ParNew: 261632K->128407K(392448K), 6.1581306 secs] 2624683K->2491459K(3014912K), 6.1586733 secs]<BR>

68485.585: [GC 68485.585: [ParNew: 390039K->130816K(392448K), 7.0108027 secs] 2753091K->2622905K(3014912K), 7.0114025 secs]<BR>

68496.017: [Full GC 68496.018: [ParNew: 392448K->392448K(392448K), 0.0001812 secs]<BR>

68496.018: [CMS68514.594: [CMS-concurrent-mark: 27.948/41.138 secs]<BR>

(concurrent mode failure): 2492089K->2622463K(2622464K), 81.4772199 secs] 2884537K->2720850K(3014912K), [CMS Perm : 269874K->269828K(786432K)], 81.4785433 secs]<BR>

68579.509: [GC [1 CMS-initial-mark: 2622463K(2622464K)] 2888804K(3014912K), 2.0011360 secs]<BR>

68581.511: [CMS-concurrent-mark-start]<BR>

68591.857: [Full GC 68591.858: [ParNew: 392448K->392448K(392448K), 0.0001915 secs]68591.858: [CMS68610.677: [CMS-concurrent-mark: 29.159/29.166 secs]<BR>

(concurrent mode failure)[Unloading class jsp._sapportalsjsp_wideNarrow]<BR>

[Unloading class jsp._sapportalsjsp_WAandNavPanel]<BR>

: 2622463K->2622463K(2622464K), 83.0276983 secs] 3014911K->2730400K(3014912K), [CMS Perm : 269836K->269772K(786432K)], 83.0290030 secs]<BR>

68676.899: [GC [1 CMS-initial-mark: 2622463K(2622464K)] 2886721K(3014912K), 2.0034195 secs]<BR>

68678.903: [CMS-concurrent-mark-start]<BR>

68689.929: [Full GC 68689.930: [ParNew: 392448K->392448K(392448K), 0.0001904 secs]<BR>

68689.930: [CMS68708.697: [CMS-concurrent-mark: 29.786/29.793 secs]<BR>

(concurrent mode failure): 2622464K->2622463K(2622464K), 85.5185985 secs] 3014912K->2916245K(3014912K), [CMS Perm : 269782K->269781K(786432K)], 85.5199161 secs]<BR>

68776.740: [GC [1 CMS-initial-mark: 2622463K(2622464K)] 2936154K(3014912K), 2.1820852 secs]<BR>

68778.923: [CMS-concurrent-mark-start]<BR>

68785.744: [Full GC 68785.745: [ParNew: 392447K->392447K(392448K), 0.0002182 secs<BR>

]68785.746: [CMS68808.847: [CMS-concurrent-mark: 29.910/29.923 secs]<BR>

(concurrent mode failure)[Unloading class sun.reflect.GeneratedConstructorAccessor1907]<BR>

: 2622464K->2622463K(2622464K), 91.0097509 secs] 3014911K->2959122K(3014912K), [CMS Perm : 269900K->269881K(786432K)], 91.0111660 secs]<BR>

68878.130: [GC [1 CMS-initial-mark: 2622463K(2622464K)] 2977048K(3014912K), 2.4666378 secs]<BR>

68880.597: [CMS-concurrent-mark-start]<BR>

68883.985: [Full GC 68883.986: [ParNew: 392447K->392447K(392448K), 0.0001916 secs]<BR>

68883.986: [CMS68910.488: [CMS-concurrent-mark: 29.884/29.891 secs]<BR>

(concurrent mode failure)[Unloading class sun.reflect.GeneratedConstructorAccessor1909]<P>

My Java parameters are:<P>

-Xms3072M<BR>

-Xmx3072M<BR>

-XX:+CMSClassUnloadingEnabled<BR>

-XX:+CMSPermGenSweepingEnabled<BR>

-XX:+DisableExplicitGC<BR>

-XX:+HandlePromotionFailure<BR>

-XX:+PrintGCDetails<BR>

-XX:+PrintGCTimeStamps<BR>

-XX:+UseCMSInitiatingOccupancyOnly<BR>

-XX:+UseConcMarkSweepGC<BR>

-XX:+UseParNewGC<BR>

-XX:CMSInitiatingOccupancyFraction 60<BR>

-XX:MaxNewSize 511m<BR>

-XX:MaxPermSize 768M<BR>

-XX:NewSize 511m<BR>

-XX:ParallelGCThreads 8<BR>

-XX:PermSize 768M<BR>

-XX:SoftRefLRUPolicyMSPerMB 1<BR>

-XX:SurvivorRatio 2<BR>

-XX:TargetSurvivorRatio 90<P>

Any suggestions?<BR>

Thanks in advance<BR>

Edited by: Aleksey Barbashin on Jun 16, 2010 9:13 AM

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2 Answers

  • author's profile photo Former Member
    Former Member
    Posted on Jun 16, 2010 at 07:35 AM

    Hi Aleksey,

    The most common cause of this exception is lack of enough memory space. Without enough memory the garbage collector wont be able to work properly Check the heap size allocation.

    Also for more details check this link:

    [Concurrent Mode Failure |A new append-structure or fill the fields in availabe append-structure;

    Regards,

    Shyam.

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  • author's profile photo Former Member
    Former Member
    Posted on Jun 17, 2010 at 02:54 PM

    You are not sized correctly, try this, replace the lines that I have listed.

    -Xss2m

    -Xms3072M

    -Xmx3072M

    -XX:MaxNewSize=512M

    -XX:NewSize=512M

    -XX:+DisableExplicitGC

    -XX:MaxPermSize=256M

    -XX:PermSize=256M

    -XX:SurvivorRatio=2

    -XX:TargetSurvivorRatio=90

    Perm size should be a lot less than new. Let me know.

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