Machine is slower with dynamic recompiler on than when it is off
Closed this issue · 2 comments
What happened?
This link at https://web.archive.org/web/20201112012244/https://www.alternatewars.com/Games/DOSBox/DOSBox.htm showing Norton SysInfo CPU performance on physical hardware with green bars and Dosbox cycle equivalents in yellow is interesting.
On a 486DX2-66 86Box machine I wanted to see how the CPU benchmark fared in sysinfo6.
A physical machine should score 141.7 according to the table.
I scored 126.9 with the dynamic recompiler turned ON, and when I turned it OFF I scored 137.9.
Pretty good! It's close to the performance of a real CPU (maybe cycle count could be adjusted a tad to inch it up to match?).
I didn't expect the dynamic recompiler to have worse performance though.. is this expected? It is a default setting.
Configuration file
n/aOperating system
Windows 10
CPU
Core 2 Duo
86Box version
v4.1.1 build 5634
Build architecture
Windows - x86 (32-bit)
Build type
- New recompiler
- Debug build
Download source
Official website (Jenkins, GitHub)
Additional context
No response
What emulated CPU? We ask for the configuration for a reason.
Ahhh, a 486. Yes, this is normal, the recompiler uses different timings from the interpreter.