On 8/25/20, 12:27 PM, Sergey Bylokhov wrote:
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.
Based on the numbers, I wonder if we should make this change ?
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.
That's a bit misleading
If I disable automatic graphics switching it is disabled for BOTH batter
and power
and vice versa. In other words there is no way to express that battery
power should fall back
to integrated and that you only want discrete when running on the adapter.
-phil
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.
