Re: [OT] A question on garbage collecting
Thank you Tamas, On 8/2/06, Tamas Szabo [EMAIL PROTECTED] wrote: Hi Leon, I doubt I have more experience :-) but as I know soft references are collected when the GC decides to do so. The only thing you can be sure of is that they will be collected _if_ the VM is running out of memory. But there is no guarantee that they will not be collected before. You are right, it is weird because you usually use them for caches but, I guess that it is VM-implementation specific. Maybe if you use another VM, or try to find some help from your VM providers Heh, getting help from sun? I think it's a myth!!! My best friends girlfriend works for storagetek which now belongs to sun, and even they don't get support. regards Leon :-) Tamas On 8/2/06, Leon Rosenberg [EMAIL PROTECTED] wrote: Hi, I have a question regarding a weird behaviour of the garbage collector, maybe someone here, has more experience with it, and can answer the question. Otherwise sorry for the OT. We have a cache for caching 1000.000 user objects along with many (some hundred thousand) not existing objects (negative cachingto prevent db requests). The cache is an array of softreferences to the objects. We used softreferences to prevent oome in case we don'T have enough ram. However now we do have enough ram - 6 Gb assigned to the java process, and System.freeMemory is always above 1 gig. However, I see that through the cache isn't full yet, and there is plenty of free memory, 500.000 objects have been garbage collected. Could it be that softreference are collected independent of available memory? If true, isn't it weird? ;-( regards Leon - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
[OT] A question on garbage collecting
Hi, I have a question regarding a weird behaviour of the garbage collector, maybe someone here, has more experience with it, and can answer the question. Otherwise sorry for the OT. We have a cache for caching 1000.000 user objects along with many (some hundred thousand) not existing objects (negative cachingto prevent db requests). The cache is an array of softreferences to the objects. We used softreferences to prevent oome in case we don'T have enough ram. However now we do have enough ram - 6 Gb assigned to the java process, and System.freeMemory is always above 1 gig. However, I see that through the cache isn't full yet, and there is plenty of free memory, 500.000 objects have been garbage collected. Could it be that softreference are collected independent of available memory? If true, isn't it weird? ;-( regards Leon - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [OT] A question on garbage collecting
Hi Leon, I doubt I have more experience :-) but as I know soft references are collected when the GC decides to do so. The only thing you can be sure of is that they will be collected _if_ the VM is running out of memory. But there is no guarantee that they will not be collected before. You are right, it is weird because you usually use them for caches but, I guess that it is VM-implementation specific. Maybe if you use another VM, or try to find some help from your VM providers :-) Tamas On 8/2/06, Leon Rosenberg [EMAIL PROTECTED] wrote: Hi, I have a question regarding a weird behaviour of the garbage collector, maybe someone here, has more experience with it, and can answer the question. Otherwise sorry for the OT. We have a cache for caching 1000.000 user objects along with many (some hundred thousand) not existing objects (negative cachingto prevent db requests). The cache is an array of softreferences to the objects. We used softreferences to prevent oome in case we don'T have enough ram. However now we do have enough ram - 6 Gb assigned to the java process, and System.freeMemory is always above 1 gig. However, I see that through the cache isn't full yet, and there is plenty of free memory, 500.000 objects have been garbage collected. Could it be that softreference are collected independent of available memory? If true, isn't it weird? ;-( regards Leon - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
