Checks to avoid exception based flow control, per review.

core/dbt/utils.py

@@ -5,6 +5,7 @@
 import itertools
 import json
 import os
+import sys
 from enum import Enum
 from pathlib import PosixPath, WindowsPath
 from typing import (
@@ -392,15 +393,16 @@ def try_get_max_rss_kb() -> Optional[int]:
     """Attempts to get the high water mark for this process's memory use via
     the most reliable and accurate mechanism available through the host OS.
     Currently only implemented for Linux."""
-    try:
-        # On Linux, the most reliable documented mechanism for getting the RSS
-        # high-water-mark comes from the line confusingly labeled VmHWM in the
-        # /proc/self/status virtual file.
-        with open("/proc/self/status") as f:
-            for line in f:
-                if line.startswith("VmHWM:"):
-                    return int(str.split(line)[1])
-    except Exception:
-        pass
+    if sys.platform == "linux" and os.path.isfile("/proc/self/status"):
+        try:
+            # On Linux, the most reliable documented mechanism for getting the RSS
+            # high-water-mark comes from the line confusingly labeled VmHWM in the
+            # /proc/self/status virtual file.
+            with open("/proc/self/status") as f:
+                for line in f:
+                    if line.startswith("VmHWM:"):
+                        return int(str.split(line)[1])
+        except Exception:
+            pass
 
     return None