bugfix for cache hit ratio calculation (d'oh)

pg_statviz.control

@@ -1,5 +1,5 @@
 # pg_statviz
 comment = 'stats visualization and time series analysis'
-default_version = '0.3'
+default_version = '0.4'
 schema = pgstatviz
 relocatable = false

pyproject.toml

@@ -1,13 +1,13 @@
 [project]
 name = "pg_statviz"
-version = "0.1"
+version = "0.4"
 description = "A minimalist extension and utility pair for time series analysis and visualization of PostgreSQL internal statistics."
 readme = "README.md"
-requires-python = ">=3.7"
+requires-python = ">=3.9"
 license = {file = "LICENSE"}
 keywords = ["open-source", "postgres", "opensource", "database", "dataviz", "time-series", "postgresql", "data-visualization", "database-management", "database-administration", "performance-analysis", "postgresql-database", "postgresql-extension", "time-series-analysis"]
 authors = [{name = "Jimmy Angelakos", email = "[email protected]"}]
-classifiers = ["Development Status :: 3 - Alpha",
+classifiers = ["Development Status :: 4 - Beta",
                "License :: OSI Approved :: PostgreSQL License",
                "Programming Language :: Python :: 3",]
 dependencies = ["argh", "contourpy", "cycler", "fonttools", "kiwisolver", "matplotlib", "numpy", "packaging", "Pillow", "psycopg2", "pyparsing", "python-dateutil", "six"]

src/pg_statviz/libs/plot.py

@@ -17,7 +17,8 @@ def setup():
         fnt.fontManager.addfont(f)
     plt.rcParams['font.family'] = 'Noto Sans'
     plt.rcParams['font.size'] = 12
-    base_image_path=importlib.resources.files("pg_statviz.libs").joinpath("pg_statviz.png")
+    base_image_path = importlib.resources.files("pg_statviz.libs")\
+        .joinpath("pg_statviz.png")
     im = plt.imread(str(base_image_path))
     height = im.shape[0]
     fig = plt.figure(figsize=(19.2, 10.8))
@@ -31,7 +32,8 @@ def setup():
 def setupdouble():
     plt = setup()[0]
     fig, (splt1, splt2) = plt.subplots(2, figsize=(19.2, 10.8))
-    base_image_path=importlib.resources.files("pg_statviz.libs").joinpath("pg_statviz.png")
+    base_image_path = importlib.resources.files("pg_statviz.libs")\
+        .joinpath("pg_statviz.png")
     im = plt.imread(str(base_image_path))
     height = im.shape[0]
     fig.figimage(im, 5, (fig.bbox.ymax - height - 6), zorder=3)

src/pg_statviz/modules/cache.py

@@ -68,9 +68,8 @@ def cache(dbname=getpass.getuser(), host="/var/run/postgresql", port="5432",
         raise SystemExit("No pg_statviz snapshots found in this database")
 
     tstamps = [t['snapshot_tstamp'] for t in data]
-    ratio = [round(100 - (int(d['blks_read'])
-                   / (int(d['blks_hit']) if d['blks_hit'] != 0 else 1)
-                   * 100), 2)
+    ratio = [round(int(d['blks_hit'])
+                   / int(d['blks_read']) + int(d['blks_hit']) * 100, 2)
              for d in data]
 
     # Plot cache hit ratio

src/pg_statviz/pg_statviz.py

@@ -6,7 +6,7 @@
 __author__ = "Jimmy Angelakos"
 __copyright__ = "Copyright (c) 2023 Jimmy Angelakos"
 __license__ = "PostgreSQL License"
-__version__ = "0.3"
+__version__ = "0.4"
 
 import sys
 from argh import ArghParser