Fix Bytecode DSL checking in heap benchmarks

Author: steve-s

graalpython/com.oracle.graal.python.benchmarks/python/heap/import-a-lot.py

@@ -59,6 +59,13 @@
 import tomllib
 import argparse
 import subprocess
+import sys
+
+# We log the bytecode DSL flag only in this benchamark, because we do not want to influence
+# the other benchmarks by importing the sys module. Other benchmarks will print a warning
+# that bytecode DSL flag could not be verified
+if getattr(getattr(sys, "implementation", None), "name", None) == "graalpy":
+    print(f"### using bytecode DSL interpreter: {__graalpython__.is_bytecode_dsl_interpreter}")
 
 # Sleep a bit to shake out weakref callbacks and get more measurement samples
 for i in range(30):

mx.graalpython/mx_graalpython_benchmark.py

@@ -418,6 +418,9 @@ def is_bytecode_dsl_config(self):
         return bool(self._extra_vm_args and '--vm.Dpython.EnableBytecodeDSLInterpreter=true' in self._extra_vm_args)
 
     def _validate_output(self, code, out, dims):
+        if "using bytecode DSL interpreter:" not in out:
+            print(f"BENCHMARK WARNING: could not verify whether running on bytecode DSL or not (expected for heap benchmarks)")
+            return code, out, dims
         is_bytecode_dsl_config = self.is_bytecode_dsl_config()
         if code == 0 and not f"using bytecode DSL interpreter: {is_bytecode_dsl_config}" in out:
             print(f"ERROR: host VM config does not match what the the harness reported. "