Fix load explosion: use subprocess for binary data plots to avoid thread conflict

Co-authored-by: copilot-swe-agent[bot] <198982749+copilot@users.noreply.github.com>

plot_binary_data.py

@@ -8,6 +8,17 @@
 ##
 #################################################
 
+## Restrict BLAS/OpenMP to one thread per process so that running
+## many workers in parallel does not create an O(workers * BLAS_threads)
+## thread explosion.  These variables MUST be set before numpy/scipy
+## are imported, because the BLAS library reads them only at load time.
+import os
+os.environ.setdefault("OMP_NUM_THREADS",        "1")
+os.environ.setdefault("OPENBLAS_NUM_THREADS",   "1")
+os.environ.setdefault("MKL_NUM_THREADS",        "1")
+os.environ.setdefault("VECLIB_MAXIMUM_THREADS", "1")
+os.environ.setdefault("NUMEXPR_NUM_THREADS",    "1")
+
 import numpy
 import scipy
 import matplotlib
@@ -18,8 +29,6 @@ from   mpl_toolkits.mplot3d import Axes3D
 ## import torch
 import AMSS_NCKU_Input      as input_data
 
-import os
-
 
 #########################################################################################
 
@@ -194,3 +203,19 @@ def get_data_xy( Rmin, Rmax, n, data0, time, figure_title, figure_outdir ):
 
 ####################################################################################
 
+
+####################################################################################
+## Allow this module to be run as a standalone script so that each
+## binary-data plot can be executed in a fresh subprocess whose BLAS
+## environment variables (set above) take effect before numpy loads.
+##
+## Usage:  python3 plot_binary_data.py <filename> <binary_outdir> <figure_outdir>
+####################################################################################
+
+if __name__ == '__main__':
+    import sys
+    if len(sys.argv) != 4:
+        print(f"Usage: {sys.argv[0]} <filename> <binary_outdir> <figure_outdir>")
+        sys.exit(1)
+    plot_binary_data(sys.argv[1], sys.argv[2], sys.argv[3])
+