[Xen-users] Re: [Xen-API] Frequent I/O error of HTTP server and memory error on XenServer5.6 FP1

[Frank <frank@xxxxxxxxx>]

Thank you. Are there many changes from 5.6 to 5.6FP1? with same 
software, xenserver5.6 works fine.
anyway, I will try your method to see how many threads run when the 
problem happens
On 01/13/2011 02:41 PM, Dave Scott wrote:
> Hi,
>
> My best guess is that the "Thread.create: Cannot allocate memory" means that 
> there's insufficient virtual address space in the process to allocate a 10MiB thread 
> stack. I suspect this is being caused by there being too many threads (approx 300 is the 
> max)
>
> Since xapi currently uses a thread per connection model there are probably too 
> many open connections -- could you describe the software which is using the 
> apache xmlrpc client? Is it possible that someone is opening connections but 
> not closing them quickly enough?
>
> If you install gdb and attach it to the running (child -- the big one) xapi 
> process it'll tell you how many threads are present and allow you to examine 
> the stacks of each one ('thread apply all bt') -- it should be easy to spot 
> where the threads are blocked (e.g. in a network recv or perhaps on a 
> pthread_mutex)
>
> At some point in future we'll have to switch to a different threading model and 
> make the connection handling more robust. In the meantime we have to be a bit 
> careful about connection cleanup :/
>
> Thanks,
> Dave
>
> > -----Original Message-----
> > From: xen-api-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-api-
> > bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Frank
> > Sent: 13 January 2011 22:14
> > To: xen-api@xxxxxxxxxxxxxxxxxxx; xen-users@xxxxxxxxxxxxxxxxxxx
> > Subject: [Xen-API] Frequent I/O error of HTTP server and memory error
> > on XenServer5.6 FP1
> >
> > Hi,
> >       I am using XenServer5.6 FP1 GA release with openvswitch as network
> > backend. When I create VM through xapi,  "apache.xmlrpc.XmlRpcException:
> > I/O error" happens very frequently. At meanwhile my xencenter lost
> > connection to hosts.
> >       Another thing is when I tried to kill VMs from xencenter, it
> > complains "Internal error:Sys_error("Thread.create: Cannot allocate
> > memory")", see attached picture.
> >       does anyone meet similar errors?
> >       Thank you.

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