add script to plot histogram of allocation sizes from malt json files

1 files changed, 58 insertions, 0 deletions

diff --git a/scripts/histogram.py b/scripts/histogram.py
new file mode 100755
index 0000000..122035e
--- /dev/null
+++ b/scripts/histogram.py
@@ -0,0 +1,58 @@
+#!/usr/bin/env python3
+
+import argparse
+import json
+import matplotlib.pyplot as plt
+
+
+parser = argparse.ArgumentParser(description="Plot interactive histogram using a malt json output file")
+parser.add_argument("malt_output_file", help="path to malt output file", type=str)
+parser.add_argument("-e", "--export", help="export to csv", action="store_true")
+
+def main():
+    args = parser.parse_args()
+
+    with open(args.malt_output_file, "r") as f:
+        res = json.load(f)
+
+    if args.export:
+        with open(args.malt_output_file.replace("json", "csv"), "w") as f:
+            print("Size", "Amount", file=f)
+            for size, amount in res["memStats"]["sizeMap"].items():
+                print(size, amount, file=f)
+    
+    else:
+        sizes = []
+        sizes_smaller_4K = []
+        sizes_smaller_32K = []
+        sizes_bigger_32K = []
+        for size, amount in res["memStats"]["sizeMap"].items():
+            size = int(size)
+            sizes += [int(size)] * amount
+            if size < 4096:
+                sizes_smaller_4K += [int(size)] * amount
+            if size < 32000:
+                sizes_smaller_32K += [int(size)] * amount
+            else:
+                sizes_bigger_32K += [int(size)] * amount
+
+
+        plt.figure(0)
+        plt.hist(sizes_smaller_4K, 200)
+        plt.title("Sizes smaller than 4K")
+
+        plt.figure(1)
+        plt.hist(sizes_smaller_32K, 200)
+        plt.title("Sizes smaller than 32K")
+
+        plt.figure(2)
+        plt.hist(sizes_bigger_32K, 200)
+        plt.title("Sizes bigger than 32K")
+
+        plt.figure(3)
+        plt.hist(sizes, 200)
+        plt.title("All sizes")
+        plt.show()
+
+if __name__ == "__main__":
+    main()