Thanks Wayne and Amy for your help.
Firstly with the -verbose:gc option, I modified my code as
follows:
for(int i=0; i < 200000000; i++) {
Vector vec = new Vector();
testCache.put(key+i, vec);
if (i%1000==0) {
System.out.println("i=" + i);
System.out.println("avail = " +
Runtime.getRuntime().freeMemory());
System.out.println("total = " +
Runtime.getRuntime().totalMemory());
}
}
so info would be dumped out every 1000 elements. Partial
results are:
Sep 10 10:22:46 2003: i=0
Sep 10 10:22:46 2003: avail = 500208
Sep 10 10:22:46 2003: total = 7782400
Sep 10 10:22:46 2003: [GC
Sep 10 10:22:46 2003: 7431K->7237K(7856K)
Sep 10 10:22:46 2003: , 0.0086215 secs]
Sep 10 10:22:46 2003:
Sep 10 10:22:46 2003: i=1000
Sep 10 10:22:46 2003: avail = 443920
Sep 10 10:22:46 2003: total = 8044544
Sep 10 10:22:46 2003: [Full GC
Sep 10 10:22:47 2003: 7749K->5441K(9840K)
Sep 10 10:22:47 2003: , 0.1197119 secs]
Sep 10 10:22:47 2003:
Sep 10 10:22:47 2003: i=2000
Sep 10 10:22:47 2003: avail = 4341272
Sep 10 10:22:47 2003: total = 10076160
Sep 10 10:22:47 2003: i=3000
Sep 10 10:22:47 2003: avail = 3843352
Sep 10 10:22:47 2003: total = 10076160
Sep 10 10:22:47 2003: [GC
Sep 10 10:22:47 2003: 6145K->5949K(9840K)
Sep 10 10:22:47 2003: , 0.0081893 secs]
Sep 10 10:22:47 2003:
Sep 10 10:22:47 2003: i=4000
Sep 10 10:22:47 2003: avail = 3570144
Sep 10 10:22:47 2003: total = 10076160
Sep 10 10:22:47 2003: [GC
Sep 10 10:22:47 2003: 6653K->6451K(9840K)
Sep 10 10:22:47 2003: , 0.0078136 secs]
Sep 10 10:22:47 2003:
Sep 10 10:22:47 2003: i=5000
Sep 10 10:22:47 2003: avail = 3255256
Sep 10 10:22:47 2003: total = 10076160
Sep 10 10:22:47 2003: i=6000
Sep 10 10:22:47 2003: avail = 2781920
Sep 10 10:22:47 2003: total = 10076160
Sep 10 10:22:47 2003: [GC
Sep 10 10:22:47 2003: 7155K->6964K(9840K)
Sep 10 10:22:47 2003: , 0.0088930 secs]
Sep 10 10:22:47 2003:
Sep 10 10:22:47 2003: i=7000
Sep 10 10:22:47 2003: avail = 2503968
Sep 10 10:22:47 2003: total = 10076160
Sep 10 10:22:47 2003: [GC
Sep 10 10:22:47 2003: 7668K->7465K(9840K)
Sep 10 10:22:47 2003: , 0.0070875 secs]
So we see that the GC messages are appearing. Yet as you could
see memory keeps going down.
Afterward I put in a 10ms delay between puts:
for(int i=0; i < 200000000; i++) {
Vector vec = new Vector();
testCache.put(key+i, vec);
if (i%1000==0) {
System.out.println("i=" + i);
System.out.println("avail = " +
Runtime.getRuntime().freeMemory());
System.out.println("total = " +
Runtime.getRuntime().totalMemory());
}
Thread.sleep(10);
}
Now it is going much slower but memory is still noticably still
going down.
Any other ideas?
Thanks,
Daniel
--- "Young, Wayne" <[EMAIL PROTECTED]> wrote:
> Do you know if garbage collections are happening? Try running
> with the
> -verbose:gc option. It could be that the objects ARE being
> dereferenced, but
> just aren't being collected before your loop ends.
>
> Wayne
>
> -----Original Message-----
> From: Daniel Rosenbaum [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, September 09, 2003 8:26 PM
> To: [EMAIL PROTECTED]
> Subject: Memory test
>
>
> Hi all,
>
> I am testing JCS to see how it handles memory. The following
> is
> a snippet of my code and config file:
>
> for(int i=0; i < 200000000; i++) {
> Vector vec = new Vector();
> testCache.put("testkey"+i, vec);
> }
>
> # DEFAULT CACHE REGION (memory cache)
> jcs.default=DC
>
jcs.default.cacheattributes=org.apache.jcs.engine.CompositeCacheAttributes
> jcs.default.cacheattributes.MaxObjects=2000
>
jcs.default.cacheattributes.MemoryCacheName=org.apache.jcs.engine.memory.lru
> .LRUMemoryCache
> jcs.default.cacheattributes.UseMemoryShrinker=true
> jcs.default.cacheattributes.ShrinkerIntervalSeconds=60
>
jcs.default.elementattributes=org.apache.jcs.engine.ElementAttributes
> jcs.default.elementattributes.IsEternal=false
> jcs.default.elementattributes.MaxLifeSeconds=43200
> jcs.default.elementattributes.IsSpool=true
> jcs.default.elementattributes.IsRemote=false
> jcs.default.elementattributes.IsLateral=false
>
> #Auxiliary CACHE (disk cache)
>
jcs.auxiliary.DC=org.apache.jcs.auxiliary.disk.indexed.IndexedDiskCacheFacto
> ry
>
jcs.auxiliary.DC.attributes=org.apache.jcs.auxiliary.disk.indexed.IndexedDis
> kCacheAttributes
> jcs.auxiliary.DC.attributes.DiskPath=jcscache
>
> jcs.region.testCache=DC
>
jcs.region.testCache.cacheattributes=org.apache.jcs.engine.CompositeCacheAtt
> ributes
> jcs.region.testCache.cacheattributes.MaxObjects=50
>
jcs.region.testCache.cacheattributes.MemoryCacheName=org.apache.jcs.engine.m
> emory.lru.LRUMemoryCache
> jcs.region.testCache.cacheattributes.UseMemoryShrinker=true
>
jcs.region.testCache.cacheattributes.ShrinkerIntervalSeconds=60
>
jcs.region.testCache.elementattributes=org.apache.jcs.engine.ElementAttribut
> es
> jcs.region.testCache.elementattributes.IsEternal=false
> jcs.region.testCache.elementattributes.MaxLifeSeconds=43200
> jcs.region.testCache.elementattributes.IdleTime=43200
> jcs.region.testCache.elementattributes.IsSpool=true
> jcs.region.testCache.elementattributes.IsRemote=false
> jcs.region.testCache.elementattributes.IsLateral=false
>
> When I run this code the memory on my system goes down very
> quickly. I expected that after the first 50 elements it would
> start putting items on disk and removing them from memory but
> this does not seem to be happening. I see the file on disk
> getting increasingly bigger but memory still keeps going,
> leading me to believe that the elements are not getting
> garbage
> collected or was never freed. Am I doing something
> incorrectly?
>
> Thanks,
> Daniel
>
>
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