iotop in openvz

haphan

Hi,

Does anyone have a patch for iotop? Mine is not working in openvz container. (python 2.6.6, iotop 1.4.2, squeeze x86)

Or if you have an alternative tool, let me know.

Cheers.

Corey

This is accurate when ran inside an openvz container?

haphan

@Corey said: This is accurate when ran inside an openvz container?

I even failed to start iotop in openvz container.

Traceback (most recent call last): File "/usr/bin/iotop", line 16, in main() File "/usr/local/lib/python2.6/dist-packages/iotop/ui.py", line 571, in main main_loop() File "/usr/local/lib/python2.6/dist-packages/iotop/ui.py", line 561, in main_loop = lambda: run_iotop(options) File "/usr/local/lib/python2.6/dist-packages/iotop/ui.py", line 465, in run_iotop return curses.wrapper(run_iotop_window, options) File "/usr/lib/python2.6/curses/wrapper.py", line 43, in wrapper return func(stdscr, *args, **kwds) File "/usr/local/lib/python2.6/dist-packages/iotop/ui.py", line 455, in run_iotop_window taskstats_connection = TaskStatsNetlink(options) File "/usr/local/lib/python2.6/dist-packages/iotop/data.py", line 146, in __init__ self.family_id = controller.get_family_id('TASKSTATS') File "/usr/local/lib/python2.6/dist-packages/iotop/genetlink.py", line 69, in get_family_id m = GeNlMessage.recv(self.conn) File "/usr/local/lib/python2.6/dist-packages/iotop/genetlink.py", line 51, in recv msg = conn.recv() File "/usr/local/lib/python2.6/dist-packages/iotop/netlink.py", line 229, in recv raise err OSError: Netlink error: No such file or directory (2)

Some people reported same issue here and here

haphan

Nobody has this problem?

gsrdgrdghd

Well what file or directory does /usr/local/lib/python2.6/dist-packages/iotop/netlink.py try to open in line 229?

haphan

def recv(self):
        contents, (nlpid, nlgrps) = _nl_recv(self.descriptor)
        msglen, msg_type, flags, seq, pid = struct.unpack("IHHII",
                                                          contents[:16])
        msg = Message(msg_type, flags, seq, contents[16:])
        msg.pid = pid
        if msg.type == NLMSG_ERROR:
            errno = -struct.unpack("i", msg.payload[:4])[0]
            if errno != 0:
                err = OSError("Netlink error: %s (%d)" % (
                                                     os.strerror(errno), errno))
                err.errno = errno
                raise err
        return msg

I have no idea what this script is trying to read. I am not a python developer so please bear with me :(

This post quickly becomes number 1 search result on google. I am a bit surprised nobody had this before.

Damian

What's the output of uname -r?

@haphan said: This post quickly becomes number 1 search result on google.

Web 2.0.

ghoulnet

Looks like your host is running an old kernel.

haphan

@ghoulnet said: Looks like your host is running an old kernel.

@Damian said: What's the output of uname -r?

hmm, does not seem old.

Host and container kernel: Linux server 2.6.32-11-pve

VictorZhang

I've tried iotop on kernel 2.6.32-042stab059.7, and it doesn't work as well. But it works fine on 2.6.18-308.el5.028stab099.3. It seems that the new OpenVZ kernel doesn't support iotop?!

haphan

@VictorZhang said: I've tried iotop on kernel 2.6.32-042stab059.7, and it doesn't work as well. But it works fine on 2.6.18-308.el5.028stab099.3. It seems that the new OpenVZ kernel doesn't support iotop?!

Yep I think it is the case too.

There is a patch for iotop 1.4.2 in openvz here. I tried and failed to apply this patch.

Can some one give it a shot?

black

I've had this problem before, all I did was remove that specific python module (can't remember what it was called) using apt-get and re-installed it using apt-get.

VictorZhang

@haphan said: There is a patch for iotop 1.4.2 in openvz here. I tried and failed to apply this patch.

Tried to apply this patch to iotop 1.4.2, also failed with the same error message :-(

yomero

Sorry, necromancing this thread

Anyone has an idea on how to get this working for .32?

Btw, the patch applies successfully, but doesn't work.

hostingwizard_net

I tried to write such a script a couple of days ago. Most disk IO stat tools use /proc/diskstats or /sys/block, both are not available inside OpenVZ. This is due to the nature of simfs so I don't think you can have something like iotop inside OpenVZ. OTOH, /proc/PROCESS_ID/io is there so you can probably build something around it but this is not the same information.

key900

iotop is working fine on both .32 and .18 without any issue.