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Your thoughts on UniPCemu? Sticky

A topic by Superfury1 created Mar 03, 2018 Views: 279 Replies: 3
Viewing posts 1 to 4
Developer

I'm curious, what do you, the user of this app, think about this app? Any ideas on improvements?

UniPCemu needs more performance, because as for now it cannot compete with Bochs and QEMU ports for Andorid.

Developer

Well, one thing UniPCemu is that those emulators aren't is that it's a cycle-accurate emulator. And as is known, accuracy takes power. A more fast mode is already implemented using IPS mode(which makes the CPU function much like Dosbox, but with maintained mechanics for CPU-BIU communication for emulator compatibility with both modes).

There are currently two parts of emulation that are very demanding on the CPU: CPU emulation(interpreter emulation at ~30% CPU usage on Intel i7-4790K@4.0GHz) and (S)VGA video card emulation is measured at ~15%(CGA is faster due to using the base 14MHz bus clock like other hardware). CPU can be slowed down without visual effect, but slowing down the (S)VGA actually lowers the framerate, leading to even worse performance, from a user point of view. The basic accuracy of both is required to properly function, so the only way ahead is just to optimize further, which still takes (more) time.

Developer

The latest builds squeeze out some more performance in IPS clocking mode(up to 25-30% speed increase). So it's at ~25% speed at 3MIPS(Intel i7), depending on the CPU mode. The same on Android on 500KIPS.