Metal os_log not working

Question

tim258 OP

Created Sep ’24

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I wanted to try the new logging feature for Metal but could not get it to work.

I modified the PerformingCalculationsOnAGPU example by adding os_log_default.log_debug("Hello thread: %d", index); to log the current thread id. But never saw any messages neither in the console nor in Xcode. I also added the -fmetal-enable-logging flag. I am running the Sequoia release candidate 15.0 (24A335) on M1 Max and Xcode 16.0 (16A242).

What am I missing?

Answered by Graphics and Games Engineer in 803443022

Can you try setting the environment variable MTL_LOG_LEVEL to MTLLogLevelDebug? That will get the command buffer to have the required MTLLogState needed for the logs to be captured by the system and reported in Console.

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Answer 1

Graphics and Games Engineer OP

Apple

Sep ’24

Accepted Answer

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Can you try setting the environment variable MTL_LOG_LEVEL to MTLLogLevelDebug? That will get the command buffer to have the required MTLLogState needed for the logs to be captured by the system and reported in Console.

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Answer 2

tim258 OP

Sep ’24

This worked for me. Thank you!

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