Mark objects as permanent

Hi,
we've got an application which is a text processing and analysis tool. It has a main analysis cycle where the application spends most of its time. As it goes, it collects some data and saves them in memory data structures (mostly, hash tables). The amount of the data is big - gigabytes, and amount of in-memory data structures is also a few gigabytes.
We have a machine with 16G and from the calculation of the memory consumable by data structures they should occupy just a portion of that. However, we hit memory limit very fast - and when we do, the system starts garbage collecting rapidly, and the system runs very slowly for quite a long time after that, but it doesn't really crash.
What I figure from this picture is that we have the following characteristics of memory:
- we have almost a fixed size per second of temporary objects that should not leave young generation. Those are used in this processing cycle and are thrown away at the end of each cycle. The size depends on the system thourhoutput and it is almost fixed, almost the same every run
- we have a huge data structure which contains objects that live from the very beginning until the very end of the application. This structure grows in size with time
- we do have some objects which live for some time, but their amount is not comparable with neither first nor second group. However, there are plenty of them to fill up tenured generation, and trigger full GC
So two things came to my mind:
1) adjust the ratio between young and tenured generations. It seems like our young generation may require only fixed amount of memory throughout the whole application run time, and tenured will then get the maximum available memory
2) somehow tell GC not to pay attention to the part of the tenured generation, which is quite significant, because we know that this part is kind of "permanent". This will reduce the full GC time
I know how to do the first, but I am unsure if this is the right thing to do. Your opinion?
I don't think there is a standard way of doing the second thing, but perhaps there is some way?
Thanks.
Denis

We use "-d64 -server" flags, so it is the default GC
for such a configuration (see the details of the
configuration above)OK, so in this case you're most likely picking up the stop-the-world parallel GC.
I personally don't think that CMS in itself will help. It sounds to me that the live size of your objects is coming too close to the capacity of the old generation. When, this happens, the old generation will be again full very soon after it's been collected, hence the frequent GCs you're seeing. GCs work best when they have enough "breathing space" in the form of some free space in the heap.
So, what can you do? There are a couple of things you should try.
First, try to Increase the heap size, which will likely allow the application to run with less Full GCs.
Second, if you don't want to / can't increase the heap size, try to balance to decrease the size of the young generation. This will increase the size of the old generation and, maybe, give it more breathing space.
Of course, I could diagnose the problem better if you shared a GC log (or, at least, GC log extracts which include the time where frequent GCs occur).
Regards,
Tony (HS GC Group)

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I do want to make sure I understand the concept clearly, so I'll write things in "my words" just to be clear.
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