Is it possible to find the number of cores

2014-04-12 Thread Cecil Westerhof 
I am experimenting with concurrent programming. Is it possible to determine
how many cores there are on a system? Because it is in the case I am
working on at the moment not profitable to use more threads as there are
cores. (That slows the program down.) Can I find out the number of cores of
the system where the program is running. Preferable system independent.

Is there also a possibility to get the load of a system? When the load is
low, I could start more threads as when the load is high.

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Cecil Westerhof

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Re: Is it possible to find the number of cores

2014-04-12 Thread Patrick Kristiansen 
http://stackoverflow.com/questions/4759570/finding-number-of-cores-in-java

On Saturday, April 12, 2014 4:43:56 PM UTC+2, Cecil Westerhof wrote:
>
> I am experimenting with concurrent programming. Is it possible to 
> determine how many cores there are on a system? Because it is in the case I 
> am working on at the moment not profitable to use more threads as there are 
> cores. (That slows the program down.) Can I find out the number of cores of 
> the system where the program is running. Preferable system independent.
>
> Is there also a possibility to get the load of a system? When the load is 
> low, I could start more threads as when the load is high.
>
> -- 
> Cecil Westerhof 
>

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Re: Is it possible to find the number of cores

2014-04-12 Thread Cecil Westerhof 
2014-04-12 16:51 GMT+02:00 Patrick Kristiansen :

> http://stackoverflow.com/questions/4759570/finding-number-of-cores-in-java
>

Thanks. I use now:
(. (. Runtime (getRuntime)) availableProcessors)



> On Saturday, April 12, 2014 4:43:56 PM UTC+2, Cecil Westerhof wrote:
>>
>> I am experimenting with concurrent programming. Is it possible to
>> determine how many cores there are on a system? Because it is in the case I
>> am working on at the moment not profitable to use more threads as there are
>> cores. (That slows the program down.) Can I find out the number of cores of
>> the system where the program is running. Preferable system independent.
>>
>> Is there also a possibility to get the load of a system? When the load is
>> low, I could start more threads as when the load is high.
>>
>
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Cecil Westerhof

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Re: Is it possible to find the number of cores

2014-04-12 Thread Fergal Byrne 
(.. Runtime getRuntime availableProcessors) is a bit cleaner


On Sat, Apr 12, 2014 at 4:18 PM, Cecil Westerhof wrote:

> 2014-04-12 16:51 GMT+02:00 Patrick Kristiansen :
>
>> http://stackoverflow.com/questions/4759570/finding-number-of-cores-in-java
>>
>
> Thanks. I use now:
> (. (. Runtime (getRuntime)) availableProcessors)
>
>
>
>> On Saturday, April 12, 2014 4:43:56 PM UTC+2, Cecil Westerhof wrote:
>>>
>>> I am experimenting with concurrent programming. Is it possible to
>>> determine how many cores there are on a system? Because it is in the case I
>>> am working on at the moment not profitable to use more threads as there are
>>> cores. (That slows the program down.) Can I find out the number of cores of
>>> the system where the program is running. Preferable system independent.
>>>
>>> Is there also a possibility to get the load of a system? When the load
>>> is low, I could start more threads as when the load is high.
>>>
>>
> --
> Cecil Westerhof
>
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Re: Is it possible to find the number of cores

2014-04-12 Thread Cecil Westerhof 
2014-04-12 17:20 GMT+02:00 Fergal Byrne :

> (.. Runtime getRuntime availableProcessors) is a bit cleaner
>

Did not know that one. Definitely better. But I already changed the way I
do it. I think I will use Runtime more often, so I do now:
(def runtime (. Runtime (getRuntime)))
(.availableProcessors runtime) 




> On Sat, Apr 12, 2014 at 4:18 PM, Cecil Westerhof 
> wrote:
>
>> 2014-04-12 16:51 GMT+02:00 Patrick Kristiansen :
>>
>>>
>>> http://stackoverflow.com/questions/4759570/finding-number-of-cores-in-java
>>>
>>
>> Thanks. I use now:
>> (. (. Runtime (getRuntime)) availableProcessors)
>>
>
-- 
Cecil Westerhof

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