On 25.08.2020 05:43, Kevin Rushforth wrote:
Does this only apply when the MacBook is running on battery, or will this
affect performance even when the laptop is plugged in? If the latter, I wonder
what Apple's rationale is for including a discrete graphics card that isn't
used most of the time.
It is applied if the "automatic graphics switching" is enabled, if the user
disables
this feature for the "power adapter" mode, then the discrete graphics will be
always used.
I guess by default they try to "maximize battery life":
https://support.apple.com/en-us/HT202043
-- Kevin
On 8/24/2020 11:27 PM, Sergey Bylokhov wrote:
On 24.08.2020 13:35, Philip Race wrote:
Is there any performance cost to doing this ? I'd expect so. Any estimate ?
Yes, performance is affected for sure:
- SwingMark:
OGL_Base: 14000
OGL_Fix: 24000
Metal: 18000
- Here is a j2dbench for the common draw operations(new/old/metal):
http://cr.openjdk.java.net/~serb/8251854/perf/results.txt
Summary:
OGL_base:
Number of tests: 24
Overall average: 4.556306150323041E8
Best spread: 0.16% variance
Worst spread: 4.68% variance
(Basis for results comparison)
OGL_fix:
Number of tests: 24
Overall average: 1.0086929824044746E8
Best spread: 0.04% variance
Worst spread: 7.89% variance
Comparison to basis:
Best result: 83.41% of basis
Worst result: 15.73% of basis
Number of wins: 0
Number of ties: 0
Number of losses: 24
metal:
Number of tests: 24
Overall average: 8.841681616575797E7
Best spread: 0.08% variance
Worst spread: 5.64% variance
Comparison to basis:
Best result: 248.11% of basis
Worst result: 19.1% of basis
Number of wins: 8
Number of ties: 2
Number of losses: 14
==========================================
- Here is a j2dbench for the common draw operations(newOGL vs metal only):
http://cr.openjdk.java.net/~serb/8251854/perf/newOGL_vs_Metal.txt
Summary:
OGL_fix:
Number of tests: 24
Overall average: 2.5871177969681844E7
Best spread: 0.04% variance
Worst spread: 7.01% variance
(Basis for results comparison)
metal:
Number of tests: 24
Overall average: 2.1896134898150157E7
Best spread: 0.04% variance
Worst spread: 1.98% variance
Comparison to basis:
Best result: 488.31% of basis
Worst result: 30.77% of basis
Number of wins: 14
Number of ties: 0
Number of losses: 10
And there's then no way to explicitly request the discrete card on a 15/16" MBP.
I have checked that the discrete card is enabled by the macOS:
- if the full screen window is set
- if the second monitor is connected
Do not know any other ways to enable it.
Should we release note this ?
Yes, I think so.
Note that it does not affect the bundled applications only apps running via
java launcher.
But some(most?) bundled java applications use this flag already.
--
Best regards, Sergey.
