diff --git a/b02 b/b02
new file mode 100755
index 0000000..54135bf
--- /dev/null
+++ b/b02
@@ -0,0 +1,48 @@
+#!/usr/bin/env python3
+
+from time import sleep, time
+
+import os
+
+from sys import stdout, stderr
+
+psi_path = '/proc/pressure/memory'
+
+psi_support = os.path.exists(psi_path)
+
+
+def rline1(path):
+    """read 1st line from path."""
+    with open(path) as f:
+        for line in f:
+            return line[:-1]
+
+
+def psi_mem_some_avg_total():
+    return float(rline1(psi_path).rpartition('=')[2])
+
+avg_min_time = 0.1
+
+if psi_support:
+    ta0 = time()
+    a0 = psi_mem_some_avg_total()
+
+
+while True:
+
+    if psi_support:
+
+        ta1= time()
+        dt = ta1 - ta0
+
+        if dt >= avg_min_time:
+
+            a1 = psi_mem_some_avg_total()
+            avg = (a1 - a0) / (ta1 - ta0) / 100
+
+            print('PSI mem avg:', round(avg, 2))
+            ta0 = ta1
+            a0 = a1
+
+    stdout.flush()
+    sleep(1)