Analysing the size of code-related entities
This page provides an analysis for the size of the image, with a focus on the size of code entities, like methods and classes.
For performance reasons the vaues of these metrics are caches in GtMemoryMetrics
. They can be reset using the snippet below.
GtMemoryMetrics reset
Current image size is 550.17 MiB
.
Total analysed size: InstanceVariableNotFound: methodSelectors not found in AllProtocol (no messages) - 0 selector(s)
Methods: 56.33 MiB
for 403798
methods.
The size of methods includes all bytecodes, additional state and literals. Literals include strings and literal arrays, but excludes symbols.
Classes: InstanceVariableNotFound: methodSelectors not found in AllProtocol (no messages) - 0 selector(s)
for 28751
classess.
Instance Side: InstanceVariableNotFound: methodSelectors not found in AllProtocol (-- all --) - 7 selector(s)
Class side: InstanceVariableNotFound: methodSelectors not found in AllProtocol (no messages) - 0 selector(s)
(metaclasses)
The size of classes includes the size of the class object and various method dictionaries, but excludes the actual methods in those dictionaries
Symbols: 6.34 MiB
for 204794
symbols
Pragmas Cache: 2.76 MiB
GT Completion Cache: 51.16 MiB
Packages: 10.67 MiB
Navigation Environment: 1.93 MiB
When using traits, metaclasses use two extra arrays. This can introduce a memory overhead when traits have many users.
Traits overhead: 11.61 MiB
This measures the size of several types of instances, to double check that the previous calculations did not miss something.
MethodDictionary
sanity check:
71522
instances
67.91 MiB
using HashedCollection>>#gtSpecificSizeInMemory
28.93 MiB
using #selector
CompiledMethod
:
403987
instances
56.36 MiB
using CompiledMethod>>#gtSpecificSizeInMemory
33.84 MiB
using #selector
ClassOrganization
:
57502
instances
InstanceVariableNotFound: methodSelectors not found in AllProtocol (-- all --) - 1 selector(s)
using ClassOrganization>>#gtSpecificSizeInMemory