[ARVADOS] updated: 2.1.0-2174-g2f5d5f03e

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Summary of changes:
 services/fuse/arvados_fuse/fusedir.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

       via  2f5d5f03ef768d5bca81d52aa70cf7383fe449a2 (commit)
      from  d3aed8ca5cbf876cdd9f3fcb36f4b44191be2066 (commit)

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commit 2f5d5f03ef768d5bca81d52aa70cf7383fe449a2
Author: Peter Amstutz <peter.amstutz at curii.com>
Date:   Tue Mar 29 21:55:26 2022 -0400

    18941: Clamp to 4 block prefetch
    
    Arvados-DCO-1.1-Signed-off-by: Peter Amstutz <peter.amstutz at curii.com>

diff --git a/services/fuse/arvados_fuse/fusedir.py b/services/fuse/arvados_fuse/fusedir.py
index d001e5728..bfd06c714 100644
--- a/services/fuse/arvados_fuse/fusedir.py
+++ b/services/fuse/arvados_fuse/fusedir.py
@@ -525,7 +525,8 @@ class CollectionDirectory(CollectionDirectoryBase):
                         self.collection.update()
                         new_collection_record = self.collection.api_response()
                     else:
-                        get_threads = min(max((self.api.keep.block_cache.cache_max // (64 * 1024 * 1024)) - 1, 1), 16)
+                        # experimentally, 4 block prefetch seems to be optimal.
+                        get_threads = min(max((self.api.keep.block_cache.cache_max // (64 * 1024 * 1024)) - 1, 1), 4)
                         # Create a new collection object
                         if uuid_pattern.match(self.collection_locator):
                             coll_reader = arvados.collection.Collection(

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