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Using dual core CPU with Nastran


Hello,
I'm using NX Nastran 5 with FEMAP 9.3 with a AMD Athlon 64 X2 dual core processor
4200+. When I use the solver only 50% of CPU is working: is there any chance to
have it 100% working? Is this supported by Nastran and/or FEMAP?
Thanks
Marco
8 REPLIES

Re: Using dual core CPU with Nastran


"Marco" wrote:
>
>Hello,
>
>I'm using NX Nastran 5 with FEMAP 9.3 with a AMD Athlon 64 X2 dual core processor
>4200+. When I use the solver only 50% of CPU is working: is there any chance
>to
>have it 100% working? Is this supported by Nastran and/or FEMAP?
>
>Thanks
>
>Marco

To make full use of all processors, when setting up the anlysis section, set the
number of processors to as may cores as you have. My PC has 2 dual core Xeon processors.
With the number of processors set at 4, I can get all working at 100% when running
Nastran. Unfortunately, FEMAP can still only make use of a single processor.
Carlton.

Re: Using dual core CPU with Nastran


Hello Carlton,
thanks for the answer. I have tried your advice, putting number of processors=2
in FEMAP analysis manager, and I saw it adds the command NASTRAN PARALLEL = 2 in
the .dat file, but running the analysis nothing changes, that is the CPU usage is
still 50% and not more... maybe I have to modify some setting somewhere?
Bye
Marco
"Carlton Matthew" wrote:
>
>"Marco" wrote:
>>
>>Hello,
>>
>>I'm using NX Nastran 5 with FEMAP 9.3 with a AMD Athlon 64 X2 dual core processor
>>4200+. When I use the solver only 50% of CPU is working: is there any chance
>>to
>>have it 100% working? Is this supported by Nastran and/or FEMAP?
>>
>>Thanks
>>
>>Marco

>To make full use of all processors, when setting up the anlysis section, set
>the
>number of processors to as may cores as you have. My PC has 2 dual core Xeon
>processors.
>With the number of processors set at 4, I can get all working at 100% when
>running
>Nastran. Unfortunately, FEMAP can still only make use of a single processor.
>Carlton.

Re: Using dual core CPU with Nastran


wrote:
>
>Hello Carlton,
>
>thanks for the answer. I have tried your advice, putting number of processors=2
>in FEMAP analysis manager, and I saw it adds the command NASTRAN PARALLEL
>= 2 in
>the .dat file, but running the analysis nothing changes, that is the CPU usage
>is
>still 50% and not more... maybe I have to modify some setting somewhere?
>
>Bye
>
>Marco
>
>"Carlton Matthew" wrote:
>>
>>"Marco" wrote:
>>>
>>>Hello,
>>>
>>>I'm using NX Nastran 5 with FEMAP 9.3 with a AMD Athlon 64 X2 dual core

>processor
>>>4200+. When I use the solver only 50% of CPU is working: is there any chance
>>>to
>>>have it 100% working? Is this supported by Nastran and/or FEMAP?
>>>
>>>Thanks
>>>
>>>Marco

>>To make full use of all processors, when setting up the anlysis section,
>set
>>the
>>number of processors to as may cores as you have. My PC has 2 dual core Xeon
>>processors.
>>With the number of processors set at 4, I can get all working at 100% when
>>running
>>Nastran. Unfortunately, FEMAP can still only make use of a single processor.
>>Carlton.

>
There are no other settings as far as I know, however, if the job reads/writes
to the disc a lot, then the CPU usage will be lower. For example, CPU usage will
be lower whilst reading/writting scratch files across a network connection.
What size and type of job are you running? I have found that not all jobs are able
to work all 4 cores I have to 100%.
Another potential problem could be using 32bit code on a 64bit processor.
Carlton.

Re: Using dual core CPU with Nastran


It will depend of your licensing. Basic Nastran license doesn't allow for more than
1 processor to be used.
Frederic Boilard
"Carlton Matthew" wrote:
>
> wrote:
>>
>>Hello Carlton,
>>
>>thanks for the answer. I have tried your advice, putting number of processors=2
>>in FEMAP analysis manager, and I saw it adds the command NASTRAN PARALLEL
>>= 2 in
>>the .dat file, but running the analysis nothing changes, that is the CPU

>usage
>>is
>>still 50% and not more... maybe I have to modify some setting somewhere?
>>
>>Bye
>>
>>Marco
>>
>>"Carlton Matthew" wrote:
>>>
>>>"Marco" wrote:
>>>>
>>>>Hello,
>>>>
>>>>I'm using NX Nastran 5 with FEMAP 9.3 with a AMD Athlon 64 X2 dual core

>>processor
>>>>4200+. When I use the solver only 50% of CPU is working: is there any chance
>>>>to
>>>>have it 100% working? Is this supported by Nastran and/or FEMAP?
>>>>
>>>>Thanks
>>>>
>>>>Marco
>>>To make full use of all processors, when setting up the anlysis section,

>>set
>>>the
>>>number of processors to as may cores as you have. My PC has 2 dual core

>Xeon
>>>processors.
>>>With the number of processors set at 4, I can get all working at 100% when
>>>running
>>>Nastran. Unfortunately, FEMAP can still only make use of a single processor.
>>>Carlton.

>>
>There are no other settings as far as I know, however, if the job reads/writes
>to the disc a lot, then the CPU usage will be lower. For example, CPU usage
>will
>be lower whilst reading/writting scratch files across a network connection.
>What size and type of job are you running? I have found that not all jobs
>are able
>to work all 4 cores I have to 100%.
>Another potential problem could be using 32bit code on a 64bit processor.
>Carlton.

Re: Using dual core CPU with Nastran


wrote:
>
>It will depend of your licensing. Basic Nastran license doesn't allow for
>more than
>1 processor to be used.
>
>Frederic Boilard
>

This is absolutely incorrect. NX Nastran does NOT require any special license to
use multiple processors.

Re: Using dual core CPU with Nastran


wrote:
>
>It will depend of your licensing. Basic Nastran license doesn't allow for
>more than
>1 processor to be used.
>
>Frederic Boilard
>
>"Carlton Matthew" wrote:
>>
>> wrote:
>>>
>>>Hello Carlton,
>>>
>>>thanks for the answer. I have tried your advice, putting number of processors=2
>>>in FEMAP analysis manager, and I saw it adds the command NASTRAN PARALLEL
>>>= 2 in
>>>the .dat file, but running the analysis nothing changes, that is the CPU

>>usage
>>>is
>>>still 50% and not more... maybe I have to modify some setting somewhere?
>>>
>>>Bye
>>>
>>>Marco
>>>
>>>"Carlton Matthew" wrote:
>>>>
>>>>"Marco" wrote:
>>>>>
>>>>>Hello,
>>>>>
>>>>>I'm using NX Nastran 5 with FEMAP 9.3 with a AMD Athlon 64 X2 dual core
>>>processor
>>>>>4200+. When I use the solver only 50% of CPU is working: is there any

>chance
>>>>>to
>>>>>have it 100% working? Is this supported by Nastran and/or FEMAP?
>>>>>
>>>>>Thanks
>>>>>
>>>>>Marco
>>>>To make full use of all processors, when setting up the anlysis section,
>>>set
>>>>the
>>>>number of processors to as may cores as you have. My PC has 2 dual core

>>Xeon
>>>>processors.
>>>>With the number of processors set at 4, I can get all working at 100% when
>>>>running
>>>>Nastran. Unfortunately, FEMAP can still only make use of a single processor.
>>>>Carlton.
>>>

>>There are no other settings as far as I know, however, if the job reads/writes
>>to the disc a lot, then the CPU usage will be lower. For example, CPU usage
>>will
>>be lower whilst reading/writting scratch files across a network connection.
>>What size and type of job are you running? I have found that not all jobs
>>are able
>>to work all 4 cores I have to 100%.
>>Another potential problem could be using 32bit code on a 64bit processor.
>>Carlton.
>

Re: Using dual core CPU with Nastran


I'm not sure what the point of bumping this post from August to the top is, but to
reiterate my follow up, this statement is absolutely incorrect for NX Nastran. NX
Nastran does NOT require any special license to use multiple processors.
Jim
P.S. I believe that MSC Nastran does charge extra... Maybe that was the source of
your confusion.

wrote:
>
> wrote:
>>
>>It will depend of your licensing. Basic Nastran license doesn't allow for
>>more than
>>1 processor to be used.
>>
>>Frederic Boilard
>>
>>"Carlton Matthew" wrote:
>>>
>>> wrote:
>>>>
>>>>Hello Carlton,
>>>>
>>>>thanks for the answer. I have tried your advice, putting number of processors=2
>>>>in FEMAP analysis manager, and I saw it adds the command NASTRAN PARALLEL
>>>>= 2 in
>>>>the .dat file, but running the analysis nothing changes, that is the CPU
>>>usage
>>>>is
>>>>still 50% and not more... maybe I have to modify some setting somewhere?
>>>>
>>>>Bye
>>>>
>>>>Marco
>>>>
>>>>"Carlton Matthew" wrote:
>>>>>
>>>>>"Marco" wrote:
>>>>>>
>>>>>>Hello,
>>>>>>
>>>>>>I'm using NX Nastran 5 with FEMAP 9.3 with a AMD Athlon 64 X2 dual core
>>>>processor
>>>>>>4200+. When I use the solver only 50% of CPU is working: is there any

>>chance
>>>>>>to
>>>>>>have it 100% working? Is this supported by Nastran and/or FEMAP?
>>>>>>
>>>>>>Thanks
>>>>>>
>>>>>>Marco
>>>>>To make full use of all processors, when setting up the anlysis section,
>>>>set
>>>>>the
>>>>>number of processors to as may cores as you have. My PC has 2 dual core
>>>Xeon
>>>>>processors.
>>>>>With the number of processors set at 4, I can get all working at 100%

>when
>>>>>running
>>>>>Nastran. Unfortunately, FEMAP can still only make use of a single processor.
>>>>>Carlton.
>>>>
>>>There are no other settings as far as I know, however, if the job reads/writes
>>>to the disc a lot, then the CPU usage will be lower. For example, CPU usage
>>>will
>>>be lower whilst reading/writting scratch files across a network connection.
>>>What size and type of job are you running? I have found that not all jobs
>>>are able
>>>to work all 4 cores I have to 100%.
>>>Another potential problem could be using 32bit code on a 64bit processor.
>>>Carlton.

>>
>

Re: Using dual core CPU with Nastran


If the software is not setup for parallel then you can gain a little by setting all
of your overheads (other processes) to one core and devoting an entire core to the
simulation. It's not much but for a serial application it's the best use of a dual
core machine.

wrote:
>
>It will depend of your licensing. Basic Nastran license doesn't allow for
>more than
>1 processor to be used.
>
>Frederic Boilard
>
>"Carlton Matthew" wrote:
>>
>> wrote:
>>>
>>>Hello Carlton,
>>>
>>>thanks for the answer. I have tried your advice, putting number of processors=2
>>>in FEMAP analysis manager, and I saw it adds the command NASTRAN PARALLEL
>>>= 2 in
>>>the .dat file, but running the analysis nothing changes, that is the CPU

>>usage
>>>is
>>>still 50% and not more... maybe I have to modify some setting somewhere?
>>>
>>>Bye
>>>
>>>Marco
>>>
>>>"Carlton Matthew" wrote:
>>>>
>>>>"Marco" wrote:
>>>>>
>>>>>Hello,
>>>>>
>>>>>I'm using NX Nastran 5 with FEMAP 9.3 with a AMD Athlon 64 X2 dual core
>>>processor
>>>>>4200+. When I use the solver only 50% of CPU is working: is there any

>chance
>>>>>to
>>>>>have it 100% working? Is this supported by Nastran and/or FEMAP?
>>>>>
>>>>>Thanks
>>>>>
>>>>>Marco
>>>>To make full use of all processors, when setting up the anlysis section,
>>>set
>>>>the
>>>>number of processors to as may cores as you have. My PC has 2 dual core

>>Xeon
>>>>processors.
>>>>With the number of processors set at 4, I can get all working at 100% when
>>>>running
>>>>Nastran. Unfortunately, FEMAP can still only make use of a single processor.
>>>>Carlton.
>>>

>>There are no other settings as far as I know, however, if the job reads/writes
>>to the disc a lot, then the CPU usage will be lower. For example, CPU usage
>>will
>>be lower whilst reading/writting scratch files across a network connection.
>>What size and type of job are you running? I have found that not all jobs
>>are able
>>to work all 4 cores I have to 100%.
>>Another potential problem could be using 32bit code on a 64bit processor.
>>Carlton.
>