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import logging
from tasks.cephfs.fuse_mount import FuseMount
from tasks.cephfs.cephfs_test_case import CephFSTestCase
log = logging.getLogger(__name__)
class TestReadahead(CephFSTestCase):
def test_flush(self):
if not isinstance(self.mount_a, FuseMount):
self.skipTest("FUSE needed for measuring op counts")
# 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()
self.mount_a.wait_until_mounted()
initial_op_r = self.mount_a.admin_socket(['perf', 'dump', 'objecter'])['objecter']['op_r']
self.mount_a.run_shell(["dd", "if=foo", "of=/dev/null", "bs=128k", "count=32"])
op_r = self.mount_a.admin_socket(['perf', 'dump', 'objecter'])['objecter']['op_r']
assert op_r >= initial_op_r
op_r -= initial_op_r
log.info("read operations: {0}".format(op_r))
# 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_r >= 32:
raise RuntimeError("readahead not working")
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