avoid div by zero when there is no I/O

Author: Phil Carns

darshan-util/pydarshan/darshan/cli/file_stats.py

@@ -212,7 +212,10 @@ def rich_print(df, mod, order_by):
     # calculate totals to plug in to table footer
     all_time_by_slowest = df["time_by_slowest"].sum()
     all_total_bytes = df["total_bytes"].sum()
-    all_perf_by_slowest = all_total_bytes / all_time_by_slowest
+    if all_total_bytes == 0:
+        all_perf_by_slowest = 0
+    else:
+        all_perf_by_slowest = all_total_bytes / all_time_by_slowest
     all_bytes_read = df["bytes_read"].sum()
     all_bytes_written = df["bytes_written"].sum()
     all_reads = df["reads"].sum()

darshan-util/pydarshan/darshan/cli/job_stats.py

@@ -130,7 +130,10 @@ def rich_print(df, mod, order_by):
     all_time_by_slowest = df['time_by_slowest'].sum()
     all_total_bytes = df['total_bytes'].sum()
     all_total_files = df['total_files'].sum()
-    all_perf_by_slowest = all_total_bytes / all_time_by_slowest
+    if all_total_bytes == 0:
+        all_perf_by_slowest = 0
+    else:
+        all_perf_by_slowest = all_total_bytes / all_time_by_slowest
 
     # instantiate a rich table and pretty print the dataframe
     console = Console()