use chunksize=1 for dynesty's pool

segasai · segasai · commit f2d1e4eefcc5 · 2026-05-05T21:19:04.000+01:00
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -8,6 +8,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 ### Added
 ### Changed
 - When restoring the sampler with the pool, try to use an updated value of queue_size based on pool size
+- Use chunksize=1 for dynesty pool as that is better behaved for queue_size>nthreads and unequal duration of function evaluations
 ### Fixed
 
 [3.0.0 - 2025-10-04]
diff --git a/py/dynesty/pool.py b/py/dynesty/pool.py
@@ -154,7 +154,7 @@ def map(self, F, x):
         F: function
         x: iterable
         """
-        return self.pool.map(F, x)
+        return self.pool.map(F, x, chunksize=1)
 
     def __exit__(self, exc_type, exc_val, exc_tb):
         try:
