[Lustre-discuss] OST threads

[Mervini, Joseph A]

That could be awful handy - especially when trying to tune a live file system for performance. Is that going to be a 2.0 only enhancement or can it be applied to existing 1.8 versions?

On Feb 24, 2011, at 9:19 PM, Andreas Dilger wrote:

> Yes, this can be set at startup time to limit the number of started threads. There is a patch I wrote to also reduce the number of running treads but it wasn't landed yet. 
> 
> Cheers, Andreas
> 
> On 2011-02-24, at 14:04, "Mervini, Joseph A" <jamervi at sandia.gov> wrote:
> 
>> I'm inclined to agree. So apparently the only time that modifying the runtime max values has a benefit is while the threads_started is low?
>> 
>> Joe
>> ====
>> 
>> Joe Mervini
>> Sandia National Laboratories
>> High Performance Computing
>> 505.844.6770
>> jamervi at sandia.gov
>> 
>> 
>> 
>> On Feb 24, 2011, at 1:09 PM, Kevin Van Maren wrote:
>> 
>>> However, I don't think you can decrease the number of running threads.
>>> See https://bugzilla.lustre.org/show_bug.cgi?id=22417 (and also 
>>> https://bugzilla.lustre.org/show_bug.cgi?id=22516 )
>>> 
>>> Kevin
>>> 
>>> 
>>> Mervini, Joseph A wrote:
>>>> Cool! Thank you Johann.
>>>> ====
>>>> 
>>>> Joe Mervini
>>>> Sandia National Laboratories
>>>> High Performance Computing
>>>> 505.844.6770
>>>> jamervi at sandia.gov
>>>> 
>>>> 
>>>> 
>>>> On Feb 24, 2011, at 11:05 AM, Johann Lombardi wrote:
>>>> 
>>>> 
>>>>> On Thu, Feb 24, 2011 at 10:48:32AM -0700, Mervini, Joseph A wrote:
>>>>> 
>>>>>> Quick question: Has runtime modification of the number of OST threads been implemented in Lustre-1.8.3?
>>>>>> 
>>>>> Yes, see bugzilla ticket 18688. It was landed in 1.8.1.
>>>>> 
>>>>> Cheers,
>>>>> Johann
>>>>> 
>>>>> -- 
>>>>> Johann Lombardi
>>>>> Whamcloud, Inc.
>>>>> www.whamcloud.com
>>>>> 
>>>>> 
>>>> 
>>>> 
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>>>> 
>>> 
>>> 
>> 
>> 
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> 

==
 
Joe Mervini
Sandia National Laboratories
Dept 09326
PO Box 5800 MS-0823
Albuquerque NM 87185-0823