Learn Microsoft Asp.Net Garbage Collection (1)

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Learn Microsoft Asp.Net Garbage Collec
tion

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The main function of the garbage collector,
as far as .NET framework is concerned, is
allocating and releasing the memory required for
the application to run. Whenever you define or
create a new object, the .NET library better
known as the Common Language Runtime or CLR in
short, is responsible for assigning memory to the
recently created object. The memory is borrowed
from the managed heap which can be called as an
ocean of memory in laymans language. As far as
this heap is available, the runtime library goes
on to allocate memory for newer objects created.
One thing you must know as a developer is that,
the memory available is limited. After repeated
use of it, the garbage collector comes into the
picture. It collects and frees the memory. The
optimizing engine decides the time for garbage
collection and commands the collector
accordingly. The time is decided based on the
memory allocations made.
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What the garbage collector does is that, it
looks for those objects stored in the memory that
are no more in use. It does the necessary
operation to free their memory and make it
available for further use. Whether the
application is a web based one or a windows based
one memory allocation and management is vital
and a cause of concern. Therefore, one can say
that the garbage collector performs a very
important task as far as .NET framework is
concerned. Now let us see the advantages of
garbage collector.
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Advantages of Garbage Collector in .NET

• Makes memory allocation for objects from the
  available managed heap.
• Ensures that one object does not occupy other
  ones memory. Thus, keeping an eye on memory
  safety and security.
• We can continue to develop an application without
  worrying about whether sufficient memory is
  available for developing and running it. Garbage
  collector will take care of it at the back end.
• Frees the memory of those objects that are not in
  use and makes it available for allocation in the
  future.

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How is Memory Allocated in Managed Heap?
For creating a new object, the new operator is
used. This new operator ensures that the required
memory or space by the object is available in the
reserved region. It also commits the storage
space if needed. If the space is optimum and the
object fits, then the object pointer points in
the heap and the constructor is given a call. The
address of the object is thus fetched. The heap
or the managed heap is nothing but, a bunch of
memory segments. Each of them is of fixed size
about 16MB. When memory is to be assigned to a
new object, the next memory location on the heap
is allocated. If there is sufficient memory
available, then the collector is not called in.
If not, the garbage collector searches and frees
the old dead objects in the heap. Then new object
is allocated memory.
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Some Important Points About Garbage Collector

• Memory allocation is carried out within a
  contiguous range of addresses.
• The segments are divided into Gen 0, Gen 1 and
  Gen 2. Gen 0 and Gen 1 form ephemeral segment.
  Gen2 are the next segments. Large object heap are
  yet another set of segments.
• Older objects are situated at lower memory
  locations, while newer are present at higher
  address locations.
• On a regular basis, the heap is freed of garbage
  and memory is made available for newer objects.
• Objects are never separated by gaps in the
  memory.

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This was the basic part of garbage collection
in .NET. Learn .net courses in pune to enhance
your knowledge in dept. Related
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