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From 塗 <sesfei2...@yahoo.co.jp>
Subject gc new capacity of JVM is gradually reducing when webapp(tomcat) started
Date Wed, 21 Apr 2010 10:37:19 GMT

hi,all

there is a problem with my webapp.

by manual configuration, i allocated 1G(1024M) memory for webapp.
where the gc new capacity automatically is 262M, the gc old capacity 
automatically is 699M, S0/S1 automatically is 43.6M/43.6M.

When my webapp is started, I use the jvm's own tools(jstat) to trace the 
garbage collections.
when the 6th Young garbage collection has happened, gc new capacity(262M) is 
gradually reducing.
About 10 hours after, gc new capacity is only 40.6M.


##web operating environment:
  tomcat5.5.27 + Apache/2.2.3 + jdk1.5.0_13 + Linux_x86_64

##blow is my manual configurations for tomcat JVM
  CATALINA_OPTS="-Xms1024M -Xmx1024M -Dorg.apache.jasper.compiler.Parser.STRICT_QUOTE_ESCAPING=false"


##Jstat Tracking data (unit/k)
  systemTime --- S0C   ---  S1C  --- S0U     --- S1U    --- EC     ---  
   --- OC     --- OU   --- YGC --- YGCT  --- FGC --- FGCT --- GCT
  10:03:10   --- 43648 --- 43648 --- 22444.3 --- 0      --- 262208 ---  
217735.7 --- 699072 --- 163.6 --- 4  --- 0.126 --- 1   --- 0.007 --- 0.132 
##webpp startup
  10:03:13   --- 43648 --- 43648 --- 22444.3 --- 0      --- 262208 ---  
217735.7 --- 699072 --- 163.6 --- 4  --- 0.126 --- 1   --- 0.007 --- 0.132
   :::::::::::::::::::::
  10:11:35   --- 43648 --- 43648 --- 0       --- 22445.1--- 262208 ---  
261516.6 --- 699072 --- 163.6 --- 5  --- 0.161 --- 1   --- 0.007 --- 0.168 
##5th YGC
  10:11:38   --- 20800 --- 33984 --- 19898   --- 0      --- 258688 ---  
4845.1   --- 699072 --- 163.6 --- 6  --- 0.192 --- 1   --- 0.007 --- 0.199 
##6th YGC, EC is reduced.
   :::::::::::::::::::::
  10:18:41   --- 33152 --- 19968 --- 0       --- 19949.1--- 255232 ---  
     --- 699072 --- 163.6 --- 7  --- 0.221 --- 1   --- 0.007 --- 0.228 
##7th YGC, EC is reduced.
   :::::::::::::::::::::
  18:34:43   --- 640   --- 704   --- 608     --- 0      --- 40832  ---  
58    --- 699072 --- 87896 --- 380--- 5.413 --- 1   --- 0.007 --- 5.419 
##380th YGC, EC is reduced.


this problem has been troubling me. please help !



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