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 514.55 MiB
.
Total analysed size: InstanceVariableNotFound: methodSelectors not found in AllProtocol (no messages) - 0 selector(s)
Methods: 55.43 MiB
for 398919
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 28426
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: 6.26 MiB
for 202300
symbols
Pragmas Cache: 2.06 MiB
GT Completion Cache: 50.18 MiB
Packages: 10.57 MiB
Navigation Environment: 1.92 MiB
When using traits, metaclasses use two extra arrays. This can introduce a memory overhead when traits have many users.
Traits overhead: 11.38 MiB
This measures the size of several types of instances, to double check that the previous calculations did not miss something.
MethodDictionary
sanity check:
70656
instances
66.79 MiB
using HashedCollection>>#gtSpecificSizeInMemory
28.44 MiB
using #selector
CompiledMethod
:
399106
instances
55.47 MiB
using CompiledMethod>>#gtSpecificSizeInMemory
33.39 MiB
using #selector
ClassOrganization
:
56852
instances
InstanceVariableNotFound: methodSelectors not found in AllProtocol (-- all --) - 1 selector(s)
using ClassOrganization>>#gtSpecificSizeInMemory