Displaying a struct containing gpuArray fields takes an extremely long time in R2024b

2025 1 14
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更新时间：2025 1 16
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I find that when I create a struct (or object) whose fields are large gpuArrays, it takes an extremely long time (1-2 minutes) to display the struct at the command line. Example:
>> c.data=gpuArray.rand(266,354,894,'single');
>> tic; c, toc
c =
struct with fields:
data: [266×354×894 gpuArray]
Elapsed time is 100.266106 seconds.
I have observed this in R2024b on two platforms,
(1) Windows 10; NVIDIA GeForce RTX 4080 SUPER
(2) Windows 11; NVIDIA RTX 5000 Ada Generation
Does anyone know why this might be happening?

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Matt J
Matt J 2025-1-14
编辑：Matt J 2025-1-14
Also, it doesn't seem to happen in R2024a, so I'm guessing R2024b introduced this problem.

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Edric Ellis
Edric Ellis 2025-1-15

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Thanks for reporting this, I can reproduce the problem here (though not so severely). For now I'm afraid the only workaround is "don't do that".

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Matt J
Matt J 2025-1-15
Thanks @Edric Ellis. Do you think it's a problem that would eventually be solved with a patch download, rather than upgrading to a new Matlab version?

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Matt J
Matt J 2025-1-16

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Here's a possible workaround:
c.a=1; c.b=2; c.data=gpuArray.rand(100,100,100,'double');
tic; c, toc
c =
struct with fields:
a: 1
b: 2
data: [100×100×100 gpuArray]
Elapsed time is 0.170750 seconds.
tic; shellClass.gather(c), toc
ans =
struct with fields:
a: 1
b: 2
data: [100×100×100 gpu_double]
Elapsed time is 0.000875 seconds.

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