use visualGC, you'll see that there are various generations of objects depending on the expected lifetime of those objects. The GC would run on those regularly even if all your allocated memory hasn't been utilized. If you have an app that uses lots of memory or that has a memory leak (which I have had to debug in the past and it is no fun), then you'll see the GC run when the tenure space is full, the tenure space GCing represents major GC cycle.
On 1/10/07, Suresh babu <[EMAIL PROTECTED]> wrote:
Hi, Just for your information .. Memmory is divided in young and old generation as object life increasing it will occupy space i old generation, Please refer SUN JVM documentation. GC will keep happening once the memmory (Young generation )reached threshold. Young generation again divided in to survivor 0 and survivor 1 spaces. When a object is created it keeps allocating in survivor spaces alternatively. Two types of GC: Mini GC : Cleaning only with in young generation Full GC: If all objects present in young generation are alive so cleaning happens in old generation hence will become FUll GC Following is the info I have sent a mail to some person (It may be usefull) --------------------------------------------------------------------------------------------------------------- Setting heap size to -Xms256 -Xmx1024 will allocate memmory intially to 256 MB and keeps expanding as allocating more objects up to 1024. My recomendation to you is as mentioned in previos mail set heap size to -Xms1536 -Xmx1536 and verify it. But Do not increase heap size blindly to greater values which may lead to performance issue(Pause times may become more to clean GC). try the heap settings and let me know, If still problem is there just send the verbose output and log file. --------------------------------------------------------------------------------------------------------------- On 1/10/07, starki78 <[EMAIL PROTECTED]> wrote: > > Hi I'm profiling my application with -verboseGC. > My maximum heap-size is > XMS is 1.5GB but the garbage collection always is executed > when about 1GB is reached. > Why is it so early? > Is there anything to control this? > I'm using Sun 1.4.2 > > Thanks and nice greetings > Starki > > > > > > > ------------------------------------------------------ > Passa a Infostrada. ADSL e Telefono senza limiti e senza canone Telecom > http://click.libero.it/infostrada10gen07 > > > > --------------------------------------------------------------------- > To start a new topic, e-mail: users@tomcat.apache.org > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > -- Suresh Babu, Software Engineer, Computer Associates-India
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