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Fix fast synch when fence is waited before a command buffer is created#2657

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awni merged 1 commit into
mainfrom
fix_fast_synch
Oct 8, 2025
Merged

Fix fast synch when fence is waited before a command buffer is created#2657
awni merged 1 commit into
mainfrom
fix_fast_synch

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@awni

@awni awni commented Oct 8, 2025

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As title.

I didn't add a test for this because we don't test the fast synch yet (maybe we should?)..

@awni

awni commented Oct 8, 2025

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The test case would be something like:

import mlx.core as mx

def fun():
    return mx.squeeze(mx.array([1.0]), stream=mx.cpu) + mx.array(1.0)

mx.synchronize() # should commit active command buffers
print(fun())

@angeloskath angeloskath left a comment

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Awesome! I am glad this ended up being an easy fix.

@awni
awni merged commit f5d4397 into main Oct 8, 2025
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@awni
awni deleted the fix_fast_synch branch October 8, 2025 18:23
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2 participants