[gpfsug-discuss] gpfs waiters debugging
Stijn De Weirdt
stijn.deweirdt at ugent.be
Tue Jun 6 14:06:57 BST 2017
oh sure, i meant waiters that last > 300 seconds or so (something that
could trigger deadlock). obviously we're not interested in debugging the
short ones, it's not that gpfs doesn't work or anything ;)
stijn
On 06/06/2017 02:57 PM, Frederick Stock wrote:
> Realize that generally any waiter under 1 second should be ignored. In an
> active GPFS system there are always waiters and the greater the use of the
> system likely the more waiters you will see. The point is waiters
> themselves are not an indication your system is having problems.
>
> As for creating them any steady level of activity against the file system
> should cause waiters to appear, though most should be of a short duration.
>
>
> Fred
> __________________________________________________
> Fred Stock | IBM Pittsburgh Lab | 720-430-8821
> stockf at us.ibm.com
>
>
>
> From: Stijn De Weirdt <stijn.deweirdt at ugent.be>
> To: gpfsug-discuss at spectrumscale.org
> Date: 06/06/2017 08:31 AM
> Subject: Re: [gpfsug-discuss] gpfs waiters debugging
> Sent by: gpfsug-discuss-bounces at spectrumscale.org
>
>
>
> hi bob,
>
> waiters from RPC replies and/or threads waiting on mutex are most
> "popular".
>
> but my question is not how to resolve them, the question is how to
> create such a waiter so we can train ourself in grep and mmfsadm etc etc
>
> we want to recreate the waiters a few times, try out some things and
> either script or at least put instructions on our internal wiki what to
> do.
>
> the instructions in the slides are clear enough, but there are a lot of
> slides, and typically when this occurs offshift, you don't want to start
> with rereading the slides and wondering what to do next; let alone debug
> scripts ;)
>
> thanks,
>
> stijn
>
> On 06/06/2017 01:44 PM, Oesterlin, Robert wrote:
>> Hi Stijn
>>
>> You need to provide some more details on the type and duration of the
> waiters before the group can offer some advice.
>>
>> Bob Oesterlin
>> Sr Principal Storage Engineer, Nuance
>>
>>
>>
>> On 6/6/17, 2:05 AM, "gpfsug-discuss-bounces at spectrumscale.org on behalf
> of Stijn De Weirdt" <gpfsug-discuss-bounces at spectrumscale.org on behalf of
> stijn.deweirdt at ugent.be> wrote:
>>
>>
>> but we are wondering if and how we can cause those waiters ourself,
> so
>> we can train ourself in debugging and resolving them (either on test
>> system or in controlled environment on the production clusters).
>>
>> all hints welcome.
>>
>> stijn
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>>
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