Did you read the documentation on the GridPP wiki (and the GridPP
Storage blog, and Alessandra's entries in the NorthGrid blog) about
making your DPM performant?
Sam
On 12 October 2012 09:44, Ben Waugh <[log in to unmask]> wrote:
> I'm increasing the allocated RAM so that I can increase
> innodb_buffer_pool_size. I can try increasing the number of CPUs too,
> although I doubt that is the bottleneck at the moment.
>
> Cheers,
> Ben
>
>
> On 12/10/12 09:33, Alessandra Forti wrote:
>>
>> If mysql starts many threads 1 cpu might be a problem and the memory
>> allocated is definitely small. Optimization is usually tied to the use
>> of more resources too in particular memory rather than disk. In
>> Manchester our old head node was 2single cpus with 4GB of memory and
>> couldn't cope. Manchester is larger it's true but still.
>>
>> cheers
>> alessandra
>>
>>
>> On 12/10/2012 09:27, Ben Waugh wrote:
>>>
>>> The host has four 7.2k RPM drives configured as RAID 10. At the moment
>>> there are only to guest systems, and the host is far from overloaded.
>>> The DPM head node only has one virtual CPU, but this doesn't seem
>>> likely to be a problem when it is I/O bound.
>>>
>>> I'll see if I can improve the MySQL performance before hunting for a
>>> better server.
>>>
>>> Cheers
>>> Ben
>>>
>>> On 11/10/12 22:57, Alessandra Forti wrote:
>>>>
>>>> What's the spec of the machine? and what else is on it?
>>>>
>>>> cheers
>>>> alessandra
>>>>
>>>> On 11/10/2012 21:21, Ben Waugh wrote:
>>>>>
>>>>> On 11/10/12 17:28, Ewan MacMahon wrote:
>>>>>>>
>>>>>>> -----Original Message-----
>>>>>>> From: GRIDPP2: Deployment and support of SRM and local storage
>>>>>>> management
>>>>>>> [mailto:[log in to unmask]] On Behalf Of Ben Waugh
>>>>>>>
>>>>>>> It does have a high load at the moment. This is about 7 now, but the
>>>>>>> baseline seems to be around 2, mostly in IO wait.
>>>>>>>
>>>>>>
>>>>>> That looks pretty abnormal to me; a DPM head node shouldn't be
>>>>>> showing much load. Does it also run the mysql database, and what
>>>>>> sort of hardware is it on (in particular, what sort of disk
>>>>>> system)?
>>>>>
>>>>>
>>>>> Actually it is on a KVM virtual machine, which I thought would be
>>>>> adequate, but I guess for the database maybe it isn't. Presumably the
>>>>> best thing would be to move either the DPM head node or just the MySQL
>>>>> server to its own physical machine.
>>>>>
>>>>> Cheers
>>>>> Ben
>>>>>
>>>>>>
>>>>>> Ewan
>>>>>
>>>>>
>>>>
>>>>
>>>
>>
>>
>
> --
> Dr Ben Waugh Tel. +44 (0)20 7679 7223
> Dept of Physics and Astronomy Internal: 37223
> University College London
> London WC1E 6BT
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