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[SR-8782] swift 4.2 - the write to file from 0,54 seconds became 6 seconds (the "swift" come back to regression again) #3635

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swift-ci opened this issue Sep 18, 2018 · 6 comments
Open

[SR-8782] swift 4.2 - the write to file from 0,54 seconds became 6 seconds (the "swift" come back to regression again) #3635

swift-ci opened this issue Sep 18, 2018 · 6 comments
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@millenomi
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bug Foundation performance

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Previous ID SR-8782
Radar rdar://problem/44562009
Original Reporter woodcrust (JIRA User)
Type Bug

Attachment: Download

Environment

Linux megatron 4.15.0-23-generic #25-Ubuntu SMP Wed May 23 18:02:16 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

Additional Detail from JIRA
Votes 3
Component/s Foundation
Labels Bug, Performance
Assignee @millenomi
Priority Medium

md5: 41e66d0b088a646c5617e609a284868a

Issue Description:

Hello, sorry for my very bad english...

I like "swift" so much. But tell me please, why with each update version "swift" becomes slower ? I now afraid what next update kill "swift". Why the write to file on linux from 0,54 seconds(swift 4.1.3 and below) became 6 seconds(swift 4.2) (screenshots below) and the write to file on macOS from 0,3 seconds became 2 seconds ?

code: https://github.com/woodcrust/puffin_bench/blob/master/source/3-writeToFile/swift3.swift
@belkadan
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Comment by Mikhail Isaev (JIRA)

Looks terrible, how performance can be worse in new release?

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Comment by Anton (JIRA)

I have the same issue, it is very strange that it is slower than previous version.

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Comment by Oleh (JIRA)

For example also I added the write to file with posix api

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Comment by Oleh (JIRA)

Linux - more regression

Swift 4.0.3 - 0.53 sec
Swift 4.2 - 6.30 sec
Swift 5.0 ~13 sec

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Comment by Oleh (JIRA)

On macos with Swift 5 mid 2015 2,5 GHz Intel Core i7 - result is better

But on Linux still same very bad result as on above screenshot

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@shahmishal shahmishal transferred this issue from apple/swift May 5, 2022
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@millenomi millenomi

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@belkadan @swift-ci