client/tests/bash_shared_mapping/bash_shared_mapping.py

import test
from autotest_utils import *
import signal

class bash_shared_mapping(test.test):
	version = 3

	# http://www.zip.com.au/~akpm/linux/patches/stuff/ext3-tools.tar.gz
	def setup(self, tarball = 'ext3-tools.tar.gz'):
		self.tarball = unmap_url(self.bindir, tarball, self.tmpdir)
		extract_tarball_to_dir(self.tarball, self.srcdir)

		os.chdir(self.srcdir)
		system('make bash-shared-mapping usemem')


	def execute(self, testdir = None):
		if not testdir:
			testdir = self.tmpdir
		os.chdir(testdir)
		file = os.path.join(testdir, 'foo')
		# Want to use twice total memsize
		kilobytes = 2 * memtotal()

		# Want two usemem -m megabytes in parallel in background.
		pid = [None, None]
		for i in (0,1):
			usemem = os.path.join(self.srcdir, 'usemem')
			args = ('usemem', '-N', '-m', '%d' % (kilobytes / 1024))
			pid[i] = os.spawnv(os.P_NOWAIT, usemem, args)

		cmd = "%s/bash-shared-mapping %s %d -t %d" % \
				(self.srcdir, file, kilobytes, count_cpus())
		os.system(cmd)

		for i in (0,1):
			os.kill(pid[i], signal.SIGKILL)