Comparison View

Last modified: 08 March 2021

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

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

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 objects that don't match the pattern.

Selecting objects for further analysis

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

  • Survived objects;

  • New objects;

  • Dead objects.

To select survived/new/dead objects

  1. Click the number in Survived objects/ New objects/ Dead objects against the desired type name.

  2. In the opened dialog, select a snapshot where you want to analyze the object set.

    After this, the Survived/New/Dead [type_name] subject will be added to the Analysis Path and the list of desired objects will be displayed in the Group by Types view.