[chromium-dev] Jankiness - what does it mean when applied to chromium code?

[Alexander Yashkin]

Hi all.
I have encountered bug which describes problem using terms as "jank" or
"jankiness"
https://bugs.chromium.org/p/chromium/issues/detail?id=456373

I do not completely sure that I understand what it means when applied to
code execution or functions.
Tried to google it, but not sure still.

Can somebody explain its meaning?

WBR Alecander Yashkin.

['Alex Clarke' via Chromium-dev]

Anything that glitches scrolling or animation smoothness is usually
referred to as jank.

Post by Alexander Yashkin
Hi all.
I have encountered bug which describes problem using terms as "jank" or
"jankiness"
https://bugs.chromium.org/p/chromium/issues/detail?id=456373
I do not completely sure that I understand what it means when applied to
code execution or functions.
Tried to google it, but not sure still.
Can somebody explain its meaning?
WBR Alecander Yashkin.
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[Alexei Svitkine]

It refers to a user visible delay. E.g. when a task takes 100ms or more on
the main thread.

Post by Alexander Yashkin
Hi all.
I have encountered bug which describes problem using terms as "jank" or
"jankiness"
https://bugs.chromium.org/p/chromium/issues/detail?id=456373
I do not completely sure that I understand what it means when applied to
code execution or functions.
Tried to google it, but not sure still.
Can somebody explain its meaning?
WBR Alecander Yashkin.
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[Alexander Yashkin]

Thanks for answers.
Whats the meaning of -
"CookieMonster::InternalInsertCookie() ~2 JPH on Windows, ~0.5 JPH on Mac"

Post by Alexei Svitkine
It refers to a user visible delay. E.g. when a task takes 100ms or more
on the main thread.
Hi all.
I have encountered bug which describes problem using terms as "jank"
or "jankiness"
https://bugs.chromium.org/p/chromium/issues/detail?id=456373
I do not completely sure that I understand what it means when
applied to code execution or functions.
Tried to google it, but not sure still.
Can somebody explain its meaning?
WBR Alecander Yashkin.
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[Alexei Svitkine]

JPH is janks per hour. I think this might have been from the old jank
profiler infrastructure that attempted to detect how many times per hour -
on average across users - a given task would cause a delay of over 117ms (I
think that was the threshold used by that infra).

Post by Alexander Yashkin
Thanks for answers.
Whats the meaning of -
"CookieMonster::InternalInsertCookie() ~2 JPH on Windows, ~0.5 JPH on Mac"

Post by Alexei Svitkine
It refers to a user visible delay. E.g. when a task takes 100ms or more
on the main thread.
Hi all.
I have encountered bug which describes problem using terms as "jank"
or "jankiness"
https://bugs.chromium.org/p/chromium/issues/detail?id=456373
I do not completely sure that I understand what it means when
applied to code execution or functions.
Tried to google it, but not sure still.
Can somebody explain its meaning?
WBR Alecander Yashkin.
http://groups.google.com/a/chromium.org/group/chromium-dev
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