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.
-- 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.
