old_contents: from pysys.constants import *
  from xpybuild.microperf_basetest import MicroPerfPySysTest
  
  class PySysTest(MicroPerfPySysTest):
  	OPERATIONS = [
  	# resultKey (must be a valid filename), command, setup
  	('fileutils.exists() non-existent file with caching',"utils.fileutils.exists(OUTPUT_DIR+'/doesntexist')", ""),
  	]
new_contents: from pysys.constants import *
  from xpybuild.microperf_basetest import MicroPerfPySysTest
  
  class PySysTest(MicroPerfPySysTest):
  	OPERATIONS = [
  	# resultKey (must be a valid filename), command, setup
  	('fileutils.exists() non-existent file without caching',"utils.fileutils.exists(OUTPUT_DIR+'/doesntexist%d'%iteration)", ""),
  	('fileutils.exists() non-existent file with caching',"utils.fileutils.exists(OUTPUT_DIR+'/doesntexist')", ""),
  	]
subject: add perf test for .exists() without caching