Open
Bug 1945990
Opened 15 days ago
Updated 14 days ago
(Spectre mitigation on local files) Testcase from Bug is 20% slower if run from a local machine compared to if run as a BMO attachment
Categories
(Core :: JavaScript Engine, task, P5)
Core
JavaScript Engine
Tracking
()
NEW
People
(Reporter: mayankleoboy1, Unassigned)
References
(Depends on 1 open bug, Blocks 1 open bug)
Details
Attachments
(1 file)
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1.64 KB,
text/html
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Details |
Open the attached testcase directly, enter "1000" and press on Compute
Download the attachment to your local machine, double click to open in Browser, enter "1000" and press on Compute
Run as attachment: https://share.firefox.dev/4gyfqFY (6.8s)
Run from local machine as a file: https://share.firefox.dev/4aOGAXN (8.3s, with some variable times).
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Reporter | |
Comment 1•14 days ago
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Profile with "1200" size.
Local: https://share.firefox.dev/411QORz (20s)
Online: https://share.firefox.dev/40YLH4y (16s)
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Comment 2•14 days ago
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Taking a look at this in samply, I think it's because spectre mitigations are enabled in the local case. I see a bunch of conditional moves in the generated code for the slow case, and none in the fast case.
I don't think this is a high priority to change.
Priority: -- → P5
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Reporter | |
Updated•14 days ago
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Depends on: spectre-jit
Summary: Testcase from Bug is 20% slower if run from a local machine compared to if run as a BMO attachment → (Spectre mitigation on local files) Testcase from Bug is 20% slower if run from a local machine compared to if run as a BMO attachment
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Description
•