[R] increase the usage of CPU and Memory

[Christofer Bogaso]

On 26-06-2012 16:33, Oliver Ruebenacker wrote:
>       Hello Xi,
>
>    If a program has input or output to disk or network, this may cause
> it to wait and not use the available CPU.
>
>    Output is usually buffered, but may cause delay if the buffer gets
> full (I'm not sure though whether this is an issue with plenty of
> memory available)
>
>       Take care
>       Oliver
>
> On Mon, Jun 25, 2012 at 8:07 PM, Xi <amzhangxi at gmail.com> wrote:
>> Dear All,
>>
>> I have been searching online for help increasing my R code more efficiently
>> for almost a whole day, however, there is no solution to my case. So if
>> anyone could give any clue to solve my problem, I would be very appreciate
>> for you help. Thanks in advance.
>>
>> Here is my issue:
>>
>> My desktop is with i7-950 Quad-core CPU with 24Gb memory, and a  NVIDIA GTX
>> 480  graphic card, and I am using a 64-bit version of R under 64-bit Windows
>> .
>>
>> I am running a "for" loop to generate a 461*5 matrix data, which is coming
>> from the coefficients of 5 models. The loop would produce 5 values one
>> time, and it will run 461 times in total. I have tried to run the code
>> inside the loop just once, it will cost almost 10 seconds, so if
>> we intuitively calculate the time of the whole loop will cost, it would be
>> 4610 seconds, equal to almost one and a half hours, which is exactly the
>> whole loop taking indeed. But I have to run this kinda loop for
>> 30 data-sets!
>>
>> Although I thought I am using a not-bad at all desktop, I checked the usage
>> of CPU and memory during my running R code, and found out the whole code
>> just used 15% of CPU and 10% of memory. Does anyone have the same issue
>> with me? or Does anyone know some methods to shorten the running time and
>> increase the usage of CPU and memory?
>>
>> Many thanks,
>> Xi
>>
>>         [[alternative HTML version deleted]]
>>
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>> and provide commented, minimal, self-contained, reproducible code.
>
>
Hi Oliver, can you please give some details on what you are meaning by 
'Output is usually buffered'?

Thanks and regards,