Kirin 950 multthread issue

[sum2012]

My freind said that PPSSPP only use Kirin' s two weak core in multthread.
Other CPU such as Qualcomm 801 ,MediaTek 6592 , MediaTek 6752 are stronger in multthread.
Any possible to solve it ? Thanks

[unknownbrackets]

Unfortunately this happens on some devices. It MAY help to turn on "real time clock sync".

The reason: in some games, there are only "spikes" of activity. Much of the time, PPSSPP may actually not use a ton of CPU - and the OS may decide to save battery power by putting it on the weaker cores. But this causes problems when the spikes happen.

This is why some users report custom ROMs with customized CPU governors help...

-[Unknown]

[sum2012]

My friend said no help.
One core 90% full speed but after a while it would become to use weaker core

[sum2012]

He tried to use only power core,but only use 1 core in playing.
This issue I think can use.
Closing

[sum2012]

Other users in china have same problem
Keep issue here.
The main problem is that why cannot use 2 power core to play.

[unknownbrackets]

Because the PSP is a single core device (so games are written in a way that won't allow them to be run on multiple cores or they'll crash), and OpenGL is a single core API.

Think of CPU cores as employees. OpenGL allows one employee to be assigned to rendering. Another employee is assigned to the CPU. We're actually able to assign another employee to disk activity and even another one to some audio decoding.

But the audio decoding and disk employees don't have much to do. They spend most of their time just sitting around doing nothing. Waiting for that moment when it's their time to shine for a brief few milliseconds.

The OpenGL rendering employee is super busy. But she isn't willing to work with other people - so we're stuck with only one person doing rendering. If rendering is behind, everything is behind, and we're stuck. We can't have two employees work on rendering.

The situation is the same with CPU emulation. We're limited to one employee working on it.

That's why it uses one core - you're seeing that one of the employees is super busy, and making all the others wait for them to complete their job. Someone is holding everything up.

Vulkan may allow spreading out the GPU load onto more cores (multiple employees doing rendering), but there's a lot of complexity there.

-[Unknown]