After reading through the chapter 20 in CLR via C#, automatic memory management, if you want to learn more about the topic, the MSDN article, Large Object Heap Uncovered picks up what the book left.
According to the author, Objects larger than 85KB are considered as large objects in CLR, and are allocated in the large object heap(LOH), rather than the usual small objects heap. In object allocation, since the memory CLR gives out is cleared, it takes longer time to clear the memory for a large object. On the other hand, large objects are generation 2 objects. So a generation 2 object collection causes all objects, both large and small, get collected.
To speed up the garbage collection in LOH, dead objects in LOH are marked and the space is put into a free list for later allocation. There is no compaction. However, because of this 'feature', frequent temporary large object release and allocation can cause virtual memory fragmentation.
One way to avoid frequent memory allocation and release and subsequent VM fragmentation is to build a object pool by oneself and reuse the objects in the pool instead of creating temporary ones. One can find an implementation here.
Another approach is utilizing VM Hoarding, supported in CLR 2.0. When enabled via hosting API, unused memory segments are not released to OS and are put on a standby list. When new memory segments are requested, the standby list is searched first. However, VM hoarding should be used with caution. it is advised that using this feature, you should test your application to make sure a stable memory usage.
Further Readings:
Maoni's WebLog - CLR Garbage Collector
CLR Inside Out: Large Object Heap Uncovered
3 comments:
It's actually 85000 bytes, not 85kb.
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This post gives you brief idea about large objects which leads to large object heap. The concept is given in simple terms so you won't find it difficult. I find this topic quite interesting and I want to know more about it.
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