samples: embassy: shrink stack a bit

Shrink the stacks down a bit so that the bench can run on targets with
64K of RAM.

Signed-off-by: David Brown <[email protected]>

Author: d3zd3z

samples/bench/src/lib.rs

@@ -41,14 +41,14 @@ const NUM_THREADS: usize = 6;
 
 /// Stack size to use for the threads.
 #[cfg(target_pointer_width = "32")]
-const THREAD_STACK_SIZE: usize = 4 * 1024;
+const THREAD_STACK_SIZE: usize = 2 * 1024;
 
 /// Stack size to use for the threads.
 #[cfg(target_pointer_width = "64")]
 const THREAD_STACK_SIZE: usize = 4096;
 
 /// Stack size to use for the work queue.
-const WORK_STACK_SIZE: usize = 4096;
+const WORK_STACK_SIZE: usize = 2048;
 
 /// This is a global iteration.  Small numbers still test functionality within CI, and large numbers
 /// give more meaningful benchmark results.