[gpfsug-discuss] cpu shielding

Matt Weil mweil at genome.wustl.edu
Wed Mar 2 20:22:05 GMT 2016



On 3/2/16 2:15 PM, viccornell at gmail.com wrote:
> Hi,
>
> How sure are you that it is cpu scheduling that is your problem?

just spotted this maybe it can help spot something.
https://software.intel.com/en-us/articles/intel-performance-counter-monitor
>
> Are you using IB or Ethernet?

two 10 gig Intel nics in a LACP bond.  links are not saturated.
>
> I have seen problems that look like yours in the past with single-network Ethernet setups. 
>
> Regards,
>
> Vic
>
> Sent from my iPhone
>
>> On 2 Mar 2016, at 20:54, Matt Weil <mweil at genome.wustl.edu> wrote:
>>
>> Can you share anything more?
>> We are trying all system related items on cpu0 GPFS is on cpu1 and the
>> rest are used for the lsf scheduler.  With that setup we still see
>> evictions.
>>
>> Thanks
>> Matt
>>
>>> On 3/2/16 1:49 PM, Bryan Banister wrote:
>>> We do use cgroups to isolate user applications into a separate cgroup which provides some headroom of CPU and memory resources for the rest of the system services including GPFS and its required components such SSH, etc.
>>> -B
>>>
>>> -----Original Message-----
>>> From: gpfsug-discuss-bounces at spectrumscale.org [mailto:gpfsug-discuss-bounces at spectrumscale.org] On Behalf Of Matt Weil
>>> Sent: Wednesday, March 02, 2016 1:47 PM
>>> To: gpfsug main discussion list
>>> Subject: [gpfsug-discuss] cpu shielding
>>>
>>> All,
>>>
>>> We are seeing issues on our GPFS clients where mmfsd is not able to respond in time to renew its lease. Once that happens the file system is unmounted.  We are experimenting with c groups to tie mmfsd and others to specified cpu's.  Any recommendations out there on how to shield GPFS from other process?
>>>
>>> Our system design has all PCI going through the first socket and that seems to be some contention there as the RAID controller with SSD's and nics are on that same bus.
>>>
>>> Thanks
>>>
>>> Matt
>>>
>>>
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