# Threads.nthreads() vs Activity Monitor number of threads (macOS)

**URL:** <https://discourse.julialang.org/t/threads-nthreads-vs-activity-monitor-number-of-threads-macos/43078>\
**Category:** General Usage\
**Tags:** question\
**Created:** [July 14, 2020, 8:42pm UTC](https://discourse.julialang.org/t/threads-nthreads-vs-activity-monitor-number-of-threads-macos/43078 "2020-07-14T20:42:34Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![CameronBieganek](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/cameronbieganek/32/6915_2.png) [@CameronBieganek](https://discourse.julialang.org/u/CameronBieganek)\
**Post date:** [July 14, 2020, 8:42pm UTC](https://discourse.julialang.org/t/threads-nthreads-vs-activity-monitor-number-of-threads-macos/43078/1 "2020-07-14T20:42:34Z")

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I have `Threads.nthreads() == 12`, but the mac Activity Monitor shows 24 threads:

 ![image](https://global.discourse-cdn.com/julialang/original/3X/1/3/13d939b68d386dfabd9873ccb8d2f4c1e8223a71.png)

Does anyone know why they’re different?

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**Author:** ![mbauman](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mbauman/32/31082_2.png) [@mbauman](https://discourse.julialang.org/u/mbauman)\
**Post date:** [July 14, 2020, 9:30pm UTC](https://discourse.julialang.org/t/threads-nthreads-vs-activity-monitor-number-of-threads-macos/43078/2 "2020-07-14T21:30:39Z")

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BLAS spins up its own set of threads.