[ceph.git] / ceph / qa / tasks / cephfs / test_readahead.py

import logging
from tasks.cephfs.cephfs_test_case import CephFSTestCase

log = logging.getLogger(__name__)


class TestReadahead(CephFSTestCase):
    def test_flush(self):
        # Create 32MB file
        self.mount_a.run_shell(["dd", "if=/dev/urandom", "of=foo", "bs=1M", "count=32"])

        # Unmount and remount the client to flush cache
        self.mount_a.umount_wait()
        self.mount_a.mount_wait()

        initial_op_read = self.mount_a.get_op_read_count()
        self.mount_a.run_shell(["dd", "if=foo", "of=/dev/null", "bs=128k", "count=32"])
        op_read = self.mount_a.get_op_read_count()
        self.assertGreaterEqual(op_read, initial_op_read)
        op_read -= initial_op_read
        log.info("read operations: {0}".format(op_read))

        # with exponentially increasing readahead, we should see fewer than 10 operations
        # but this test simply checks if the client is doing a remote read for each local read
        if op_read >= 32:
            raise RuntimeError("readahead not working")
Commit	Line	Data
7c673cae	1	import logging
7c673cae FG	2	from tasks.cephfs.cephfs_test_case import CephFSTestCase
	3
	4	log = logging.getLogger(__name__)
	5
	6
	7	class TestReadahead(CephFSTestCase):
	8	def test_flush(self):
7c673cae FG	9	# Create 32MB file
	10	self.mount_a.run_shell(["dd", "if=/dev/urandom", "of=foo", "bs=1M", "count=32"])
	11
	12	# Unmount and remount the client to flush cache
	13	self.mount_a.umount_wait()
e306af50	14	self.mount_a.mount_wait()
7c673cae	15
f67539c2	16	initial_op_read = self.mount_a.get_op_read_count()
7c673cae	17	self.mount_a.run_shell(["dd", "if=foo", "of=/dev/null", "bs=128k", "count=32"])
f67539c2	18	op_read = self.mount_a.get_op_read_count()
2a845540	19	self.assertGreaterEqual(op_read, initial_op_read)
f67539c2 TL	20	op_read -= initial_op_read
f67539c2 TL	21	log.info("read operations: {0}".format(op_read))
7c673cae FG	22
	23	# with exponentially increasing readahead, we should see fewer than 10 operations
	24	# but this test simply checks if the client is doing a remote read for each local read
f67539c2	25	if op_read >= 32:
7c673cae	26	raise RuntimeError("readahead not working")