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chore: optimize op_runtime_cpu_usage and op_runtime_memory_usage #29179

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@CyanChanges CyanChanges commented May 6, 2025

#27217

op_runtime_cpu_usage can be optimized by accepting a &mut [u32] instead of returning a serde tuple but it can be done as a follow up.

Accept a &mut [u32] instead of serde tuple for op_runtime_cpu_usage and op_runtime_memory_usage

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do we need to move the buffer here outside to avoid allocate memory each time?

@CyanChanges CyanChanges marked this pull request as draft May 6, 2025 06:43
@CyanChanges CyanChanges marked this pull request as ready for review May 6, 2025 07:07
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0f-0b commented May 6, 2025

u32 isn't wide enough to hold all possible return values.

$ deno eval 'new Uint8Array(2 ** 32); console.log(Deno.memoryUsage())'
{
  rss: 43925504,
  heapTotal: 7340032,
  heapUsed: 6022768,
  external: 4298203118
}

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CyanChanges commented May 6, 2025

u32 isn't wide enough to hold all possible return values.

$ deno eval 'new Uint8Array(2 ** 32); console.log(Deno.memoryUsage())'
{
  rss: 43925504,
  heapTotal: 7340032,
  heapUsed: 6022768,
  external: 4298203118
}

But it is not possible to use &mut [u64] in the ops i guess?

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or maybe we need read bigints from the buffer and cast them back to numbers?

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I checked Node.js's implementation, and now using Float64Array for this:
image

@CyanChanges CyanChanges requested a review from littledivy May 6, 2025 10:01
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3 participants