dotMemory 2016.1 Help

Comparison View

The Comparison view shows data in a list with the following columns:

NameDescription
Type Type name.
Survived objects The number of instances that exist in both snapshots.
New objects The number of new instances that were created between snapshots.
Dead objects The number of instances that existed in the base snapshot but were collected by the moment of taking a second snapshot.
Objects delta The difference between the number of new and dead objects.
Survived bytes The overall size of survived objects in bytes.
New bytes The overall size of new objects in bytes.
Dead bytes The overall size of dead objects in bytes.
Bytes delta The difference between the size of new and dead objects.

Example

comparison_view_2

Grouping Object Sets

For convenience, you can group the list in four different ways:

  • Plain List
    Object sets are displayed in a plain list. This is the easiest way to identify objects with the highest memory usage.
  • Group by Interface
    Object sets are grouped by interfaces they implement. If an object implements more than one interface, it will be displayed under each implemented interface.
  • Group by Namespace
    Object sets are grouped by their namespace. This type of grouping is very convenient when you want to concentrate in determining issues in your own classes.
  • Group by Assembly
    Objects are grouped by the assembly they come from. This type of grouping can also be used to separate your own classes from the system ones.

Filtering Objects in the List

You can filter out object sets that are of no interest for your analysis.

To narrow the list, start typing the desired type name in the Filter field. dotMemory will exclude all sets that doesn't match the pattern from the list.

What Can I Analyze Next?

In the Comparison view, you can select the following subjects for further analysis:

  • Survived objects
    To select a certain set of survived objects for analysis, click on the number in Survived objects against the desired type name. In the opened dialog, select a snapshot where you want to analyze the object set. After this, the Survived [type_name] subject will be added to the Analysis Path and the list of survived objects will be displayed in the Type List view.

  • New objects
    To select a certain set of new objects for analysis, click on the number in New objects against the desired type name. After this, the New [type_name] subject will be added to the Analysis Path and the list of new objects will be displayed in the Type List view.

  • Dead objects
    To select a certain set of survived objects for analysis, click on the number in Dead objects against the desired type name. In the opened dialog, select a snapshot where you want to analyze the object set. After this, the Dead [type_name] subject will be added to the Analysis Path and the list of dead objects will be displayed in the Type List view.
Last modified: 19 August 2016