diff --git a/src/pypi_data/cli.py b/src/pypi_data/cli.py
index 9ed312a4..5cf3a158 100644
--- a/src/pypi_data/cli.py
+++ b/src/pypi_data/cli.py
@@ -164,7 +164,8 @@ def merge_datasets(
         repos = Repos.model_validate_json(fd.read()).root
     max_buffer_size = pydantic.RootModel[ByteSize].model_validate(max_buffer_size).root
     target_size = pydantic.RootModel[ByteSize].model_validate(target_size).root
-    asyncio.run(combine_parquet(repos, output, max_buffer_size, target_size))
+    # Debug failures...
+    asyncio.run(combine_parquet(repos[200:], output, max_buffer_size, target_size))
 
 
 async def resolve_dataset_redirects(
diff --git a/src/pypi_data/combine_parquet.py b/src/pypi_data/combine_parquet.py
index 719f2e40..52e646c6 100644
--- a/src/pypi_data/combine_parquet.py
+++ b/src/pypi_data/combine_parquet.py
@@ -74,6 +74,7 @@ async def fill_buffer(
     max_buffer_size: int,
     client: httpx.AsyncClient,
     repositories: Deque[CodeRepository],
+    directory: Path,
 ) -> bool:
     while repositories:
         time_hashing_ns = 0
@@ -139,6 +140,7 @@ async def fill_buffer(
             f"iter={time_iterating_ns // 1_000_000} ms "
             f"hash={time_hashing_ns // 1_000_000} ms"
         )
+        log_system_stats(directory)
 
     return bool(buffer)
 
@@ -175,7 +177,9 @@ async def combine_parquet(
     async with httpx.AsyncClient(follow_redirects=True) as client:
         while repositories:
             if (
-                await fill_buffer(buffer, max_buffer_size, client, repositories)
+                await fill_buffer(
+                    buffer, max_buffer_size, client, repositories, directory
+                )
                 is False
             ):
                 continue
@@ -200,7 +204,7 @@ async def combine_parquet(
                 while buffer or repositories:
                     if not buffer:
                         res = await fill_buffer(
-                            buffer, max_buffer_size, client, repositories
+                            buffer, max_buffer_size, client, repositories, directory
                         )
                         if res is None:
                             continue