How Much Memory Do Go Closures Actually Consume?
Oct 31, 2024 pm 09:25 PMIn Memory Layout of Go Closures
In contrast to JavaScript, which leverages a different closure implementation, Go closures are stored on the heap due to variable longevity.
Memory Allocation for Closures
Consider the following function that generates a closure:
<code class="go">type M int func (m *M) Adder(amount int) func() { return func() { *m = *m + amount } }</code>
When calling a := m.Adder(), two heap allocations occur:
- 16 bytes: Stores the function pointer and the pointer to the captured variable (m).
- Variable size: Dependent on the captured variable's type and size. In this case, it's an int, so it takes 4 bytes.
Memory Footprint of Returned func() Value
The returned func() value consumes:
- 8 bytes on 32-bit platforms, 16 bytes on 64-bit platforms: Stores the function pointer.
Therefore, the total memory footprint of the closure in this example is 20 bytes on 32-bit platforms, 32 bytes on 64-bit platforms.
Example:
<code class="go">func closure() func() *byte { var b [4 * 1024]byte return func() *byte { return &amp;b[0] } }</code>
Calling closure() allocates:
- 16 bytes: Closure metadata (function pointer, captured variable pointer)
- 4096 bytes: The byte array captured by the closure
Resulting in a total memory allocation of 4112 bytes.
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