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From "Smuts, Aaron" <Aaron.Sm...@travelocity.com>
Subject RE: Thread Lockup/Slowdown?
Date Fri, 02 Feb 2007 20:21:44 GMT
Don't run JCS with the JCS log levels set to debug.  Verify only executes if you are in debug.
 There is so much debug logging, the cache is not usable in this mode.  

> -----Original Message-----
> From: Cooper, Jeremy [mailto:jeremy.cooper@retirementpartner.com]
> Sent: Friday, February 02, 2007 12:00 PM
> To: JCS Users List
> Subject: Thread Lockup/Slowdown?
> 
> On 2/1/2007 we had a problem where many of our web app threads were
> waiting for
> org.apache.jcs.engine.memory.lru.LRUMemoryCache.verifyCache , See
> ThreadDumps below.
> 
> Any ideas on why this call would hang up most of our threads?
> Additionally how could we prevent it?
> 
> Thanks
> Jeremy
> 
> Runnable:
> daemon prio=5 tid=0x0084f280 nid=0xa9 runnable [7b5ff000..7b6019c0]
> at
> org.apache.jcs.engine.memory.lru.LRUMemoryCache.verifyCache(LRUMemoryCache
> .java:639)      at
> org.apache.jcs.engine.memory.lru.LRUMemoryCache.get(LRUMemoryCache.java:30
> 5)      - locked <
> 0x9f89b968> (a org.apache.jcs.engine.memory.lru.LRUMemoryCache)      at
> org.apache.jcs.engine.control.CompositeCache.get(CompositeCache.java:452)
>      at
> org.apache.jcs.engine.control.CompositeCache.get(CompositeCache.java:413)
>      at org.apache.jcs.access.CacheAccess.get(CacheAccess.java:195)
> 
> All other threads:
> daemon prio=5 tid=0x0084fe70 nid=0xaa waiting for monitor entry
> [7b500000..7b5019c0]      at
> org.apache.jcs.engine.memory.lru.LRUMemoryCache.get(LRUMemoryCache.java)
>      - waiting to lock <0x9f89b968> (a
> org.apache.jcs.engine.memory.lru.LRUMemoryCache)      at
> org.apache.jcs.engine.control.CompositeCache.get(CompositeCache.java:452)
>      at
> org.apache.jcs.engine.control.CompositeCache.get(CompositeCache.java:413)
>      at org.apache.jcs.access.CacheAccess.get(CacheAccess.java:195)
> 
> 
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