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Date: Wed, 9 Nov 2022 22:26:18 -0800 (PST)
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Subject: Re: GNAT Speed Comparison on Older Intel versus Apple Silicon M1
From: Jerry <list_email@icloud.com>
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On Wednesday, November 9, 2022 at 12:38:51 AM UTC-7, Fernando Oleo Blanco wrote:
> Hi Jerry, 
> 
> taking the results from Geekbench: [1] for your current MacBook and [2] 
> for the M1 MacBook from 2021; the results show that single core 
> performance of the M1 MacBook Pro is about 6.4 times faster. 

That's a great site. Thanks. Clicking around a bit I was able to find separate comparisons for single-core floating point and the speed-up is 5.2.
> 
> However, notice that it is running on Aarch64 natively for the M1. 

GNAT compiles to Aarch64 now, right?

> Nonetheless, you can run x86 programs with little performance hit thanks 
> to Apple Rosseta. 

"little performance hit" compared to Intel code running on Rosseta versus Intel silicon or compared to native ARM? And I wonder how long until Apple takes away Rosseta this time? Last time it was two OS updates and then, poof,  gone.
> 
> Also, GNAT afaik, allows for parallel computations using tasks. The 
> multicore performance gain between the two models is about 24x. 
> 
> There results are however just an average. Maybe your program does not 
> see such improvements as it may bottleneck earlier or it may see greater 
> gains. 
> 
> Regards, 
> 
> [1] https://browser.geekbench.com/macs/macbook-pro-early-2008 
> [2] https://browser.geekbench.com/v5/cpu/18518008 
> 
> -- 
> Fernando Oleo Blanco 
> https://irvise.xyz