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[SR-4889] Memory leak when using simple [String: Int] dictionary #47466

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swift-ci opened this issue May 15, 2017 · 5 comments
Closed

[SR-4889] Memory leak when using simple [String: Int] dictionary #47466

swift-ci opened this issue May 15, 2017 · 5 comments
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@lorentey
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. memory leak bug: Memory leak standard library Area: Standard library umbrella

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@swift-ci
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Previous ID SR-4889
Radar rdar://problem/32199117
Original Reporter scelis (JIRA User)
Type Bug
Status Resolved
Resolution Done

Attachment: Download

Environment

Apple Swift version 3.1 (swiftlang-802.0.53 clang-802.0.42)
Target: x86_64-apple-macosx10.9
macOS 10.12.4 (16E195)

Additional Detail from JIRA
Votes 0
Component/s Standard Library
Labels Bug, Leak
Assignee @lorentey
Priority Medium

md5: 1760583001e280ddf5a4b55fa63eeedb

Issue Description:

Attached is some Swift code I was using to solve http://adventofcode.com/2016/day/23

It simulates a computer with a simple instruction set and four registers. When storing these registers into a `[String: Int]` dictionary, the program's memory footprint quickly balloons to an incredible size (multiple GBs within a minute). If the registers are instead stored in an `[Int]` array, the program executes for a long time with no perceivable memory issues.

Given the attached code I would expect both solutions to use a similar (trivial) about of memory.

I was able to replicate this issue both inside of Xcode as well as on the command line.
@belkadan
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Oops, sorry, wrong bug.

@belkadan
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leaks reports no actual leaks, which makes me suspect there's a giant autorelease pool somewhere here.

@belkadan
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…but I don't see any obvious places that would introduce that.

@belkadan
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@swift-ci create

@belkadan
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Fixed by aschwaighofer@apple.com (JIRA User) in #12312 (master) and #12343 (4.0 branch).

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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@lorentey lorentey

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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. memory leak bug: Memory leak standard library Area: Standard library umbrella
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@belkadan @swift-ci