calibre, ARM, win11

[apricoto]

I was considering buying a MS Surface laptop with ARM processor. Checking apps compatibility I get the impression that the current versions of Calibre are not considered to be compatible with win11 running on ARM.

If this is still correct, might be a good idea to put a note on the Calibre Windows download page warning people that it won't work on their win11 computer if it has an ARM processor.

[JSWolf]

Originally Posted by apricoto

I was considering buying a MS Surface laptop with ARM processor. Checking apps compatibility I get the impression that the current versions of Calibre are not considered to be compatible with win11 running on ARM.

If this is still correct, might be a good idea to put a note on the Calibre Windows download page warning people that it won't work on their win11 computer if it has an ARM processor.

Prism is the software with Windows 11 for ARM that allow x86 and x64 translation. So I see no reason why calibre would not run.

https://learn.microsoft.com/en-us/wi...-x86-emulation

Prism

Prism is the new emulator included with Windows 11 24H2. Compared to previous emulation technology included in Windows, it includes significant optimizations that improve the performance and lower CPU usage of apps under emulation.

Prism is optimized and tuned specifically for Qualcomm Snapdragon processors. Some performance features within Prism require hardware features only available in the Snapdragon X series, but Prism is available for all supported Windows 11 on Arm devices with Windows 11 24H2.

[jmurphy]

I'm running on a Surface Pro 11 (ARM). Calibre 9.7 hasn't given me any trouble yet. So far it seems 100% compatible. And the Prism emulation seems to be as fast as an Intel I5.

[kovidgoyal]

It works fine via emulation so far as I know.

[JSWolf]

Originally Posted by jmurphy

I'm running on a Surface Pro 11 (ARM). Calibre 9.7 hasn't given me any trouble yet. So far it seems 100% compatible. And the Prism emulation seems to be as fast as an Intel I5.

Which generation i5 processor?

[apricoto]

ok. this is why I asked. I had seen a post on Mobileread Calibre forum. Someone asked about ARM, last sept I believe. Kovidgayol replied that it was a niche market, and no plans to compile for it.

Either something has changed, or I misunderstood.

IAC, thanks for clarifying.

[apricoto]

Originally Posted by JSWolf

Which generation i5 processor?

whatever processor is in the current Surface 13" laptop.

[PeterT]

Originally Posted by apricoto

whatever processor is in the current Surface 13" laptop.

Actually nothing has changed. There is still no natives calibre build. What will happen is that the device will execute the Intel binary through its built-in emulation layer called Prism.

[DNSB]

Originally Posted by apricoto

ok. this is why I asked. I had seen a post on Mobileread Calibre forum. Someone asked about ARM, last sept I believe. Kovidgayol replied that it was a niche market, and no plans to compile for it.

Either something has changed, or I misunderstood.

IAC, thanks for clarifying.

The code is not compiled for Windows ARM. It is run using the Windows ARM x64 emulator. One friend of mine is using the latest(?) Prism emulator on his Surface Laptop with a Snapdragon processor and is happy enough with the calibre's speed.

[jmurphy]

Originally Posted by JSWolf

Which generation i5 processor?

Any recent generation. You're not likely to see a large difference between 12th, 13th, 14th generations when running an application like Calibre. The differences in performance might show up in a benchmark, but any recent i5 will perform roughly the same as any other i5 for most applications.