Problem: jemalloc warning message mess-up test logic

Solution:
- filter then from the cli stdout

testground/benchmark/benchmark/cli.py

@@ -9,10 +9,17 @@ def __init__(self, cmd):
  def raw(self, *args, stdin=None, stderr=subprocess.STDOUT, **kwargs):
  "execute the command"
  args = " ".join(build_cli_args_safe(*args, **kwargs))
- return interact(
+ stdout = interact(
  f"{self.cmd} {args}", input=stdin, stderr=stderr, env=os.environ
  )
 
+ # filter out "<jemalloc>:" warning messages
+ stdout = "\n".join(
+ line for line in stdout.splitlines() if not line.startswith("<jemalloc>:")
+ )
+
+ return stdout
+
  def __call__(self, *args, **kwargs):
  "execute the command and clean the output"
  return self.raw(*args, **kwargs).decode().strip()