Fix interval handling.

Author: samuel-williams-shopify

lib/memory/profiler/sampler.rb

@@ -146,15 +146,15 @@ def stop
 			# @parameter interval [Numeric] Seconds between samples.
 			# @yields {|sample| ...} Called when a class shows significant growth.
 			def run(interval: 60, &block)
-				start_time = Process.clock_gettime(Process::CLOCK_MONOTONIC)
-				
 				while true
+					start_time = Process.clock_gettime(Process::CLOCK_MONOTONIC)
+					
 					sample!(&block)
 
+					# Sleep for the remainder of the interval:
 					now = Process.clock_gettime(Process::CLOCK_MONOTONIC)
 					delta = interval - (now - start_time)
 					sleep(delta) if delta > 0
-					start_time = now
 				end
 			end
 

releases.md

@@ -1,5 +1,9 @@
 # Releases
 
+## Unreleased
+
+  - Fix sampler loop interval handling.
+
 ## v1.1.12
 
   - Use `rb_obj_id` for tracking object states to avoid compaction issues.