Queue max_size defaults to Block's max_threads on ZeroGPU Spaces (#…

…4937)

* Queue max_size defaults to Block's max_threads on ZeroGPU Spaces

* More readable ?

* CHANGELOG

CHANGELOG.md

@@ -33,6 +33,7 @@ demo.launch()
 - Warning on mobile that if a user leaves the tab, websocket connection may break. On broken connection, tries to rejoin queue and displays error conveying connection broke. By [@aliabid94](https://github.com/aliabid94) in [PR 4742](https://github.com/gradio-app/gradio/pull/4742)
 - Remove blocking network calls made before the local URL gets printed - these slow down the display of the local URL, especially when no internet is available. [@aliabid94](https://github.com/aliabid94) in [PR 4905](https://github.com/gradio-app/gradio/pull/4905).
 - Pinned dependencies to major versions to reduce the likelihood of a broken `gradio` due to changes in downstream dependencies by [@abidlabs](https://github.com/abidlabs) in [PR 4885](https://github.com/gradio-app/gradio/pull/4885)
+- Queue `max_size` defaults to parent Blocks `max_thread` when running on Spaces with ZeroGPU hardware. By [@cbensimon](https://github.com/cbensimon) in [PR 4937](https://github.com/gradio-app/gradio/pull/4937)
 
 ## Breaking Changes:
 

gradio/blocks.py

@@ -1619,11 +1619,12 @@ def queue(
             warn_deprecation(
                 "The client_position_to_load_data parameter is deprecated."
             )
+        max_size_default = self.max_threads if utils.is_zero_gpu_space() else None
         self._queue = queueing.Queue(
             live_updates=status_update_rate == "auto",
             concurrency_count=concurrency_count,
             update_intervals=status_update_rate if status_update_rate != "auto" else 1,
-            max_size=max_size,
+            max_size=max_size_default if max_size is None else max_size,
             blocks_dependencies=self.dependencies,
         )
         self.config = self.get_config_file()

gradio/utils.py

@@ -113,6 +113,10 @@ def get_space() -> str | None:
     return None
 
 
+def is_zero_gpu_space() -> bool:
+    return os.getenv("SPACES_ZERO_GPU") == "true"
+
+
 def readme_to_html(article: str) -> str:
     try:
         response = requests.get(article, timeout=3)