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From Yefym Dmukh <Yefym.Dm...@icw-global.com>
Subject Re: Feature request /Discussion: JK loadbalancer improvements for high load
Date Thu, 05 Jul 2007 10:11:22 GMT
Hi Rainer,
seems we have still an issue in jvm config. we have not noticed the 
concurrent mode gc failures that led to tomcat overload and bad responses.

14896.148: [Full GC 14896.148: [CMS (concurrent mode failure): 
1102956K->326641K(2359296K), 4.0684463 secs] 1280549K->326641K(3067136K), 
[CMS Perm : 131071K->62120K(131072K)], 4.0690589 secs]

15346.161: [Full GC 15346.161: [CMS (concurrent mode failure): 
1546160K->324956K(2359296K), 3.4321099 secs] 1637284K->324956K(3067136K), 
[CMS Perm : 131071K->62222K(131072K)], 3.4327402 secs]



 Unfortunetely the concurrent algorithms in java need itself 30%-50% of 
memory, so if the jvm still allocates the objs in tenured and there is not 
enough   memory for concurrent gc stuff - it makes stop-the-world. Anyway 
these events are fired in JVM and would be really really nice if the 
load-balancer could be smart enough to react on it , e.g. redirecting the 
load. 

Agreed, that this problem is not easy to solve and may be  requires some 
features from jvm side that are not implemented yet. 


Regards,
Y.

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Yefym Dmukh
InterComponentWare AG
R&D Personal Health Record
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Germany 

Phone:  +49 6227 385 122
Fax:    +49 6227 385 588
Mail:   Yefym.Dmukh@icw-global.com
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