Use of sim file opening option: Parallel on local host

dmangesh · May 16, 2019, 10:38

Hi,

I would like to know what is the use of an option you get when you try to open a sim file.

You can open a file in serial, parallel on local host and so on...

In that, if you just have ccmpsuite license and you open a sim using parallel on local host (let's say 4 cores) then how is that beneficial?

Best,
Mangesh Dake

fluid23 · May 16, 2019, 13:47

Are you asking why 4 cores is beneficial?

A computer scientist will probably give you a more technical answer, but it's all about RAM. Running a model in parallel distributes the calculations across multiple cores so that you can get around limits imposed by machine architecture (max RAM per core) and in some cases speed up your solutions by not running at the limits of what any one core can do on its own.

dmangesh · May 17, 2019, 09:52

Thanks for you reply. I don't think ccmpsuite licence allows for multicore processing. Have you used that option in STAR CCM+ before?

dmangesh · May 17, 2019, 09:54

Quote:

Originally Posted by fluid23

Are you asking why 4 cores is beneficial?

A computer scientist will probably give you a more technical answer, but it's all about RAM. Running a model in parallel distributes the calculations across multiple cores so that you can get around limits imposed by machine architecture (max RAM per core) and in some cases speed up your solutions by not running at the limits of what any one core can do on its own.

Thanks for you reply. I don't think ccmpsuite licence allows for multicore processing. Have you used that option in STAR CCM+ before?

fluid23 · May 17, 2019, 11:13

If you only have one seat of ccmpsuite available then you are limited to one core unless you have STAR-HPC or power tokes (depending on your version number). If you have multiple seats then you can check out multiple licenses, one for each core.

Our server uses one ccmpsuite license per user and power tokes as needed to meet the needed computational power.

Here is a link to a good discussion of licensing options.

LuckyTran · May 17, 2019, 13:35

Traditionally, you always need a ccmpsuite license to open anything in serial or parallel (unless you are using a power license or power-on-demand).

I don't really follow what is the question being asked. What do you need to know beyond this?

If you have only one ccmpsuite then you can only run in serial (or parallel with 1 process) since you don't have any more licenses to run additional processes.

If you want to run parallel with 4 cores then you need 3 more ccmpsuite licenses or 3 more parallel licenses or some mix-and-match combination that somehow sums up to 4. The difference is that 3 ccmpsuites will cost you a lot more $ than 3 parallel licenses because the ccmpsuite license allows you to run more jobs.

May 16, 2019, 10:38	Use of sim file opening option: Parallel on local host	#1
dmangesh New Member Mangesh Dake Join Date: Jan 2017 Location: USA Posts: 7 Rep Power: 9	Hi, I would like to know what is the use of an option you get when you try to open a sim file. You can open a file in serial, parallel on local host and so on... In that, if you just have ccmpsuite license and you open a sim using parallel on local host (let's say 4 cores) then how is that beneficial? Best, Mangesh Dake

May 17, 2019, 11:13		#5
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 17	If you only have one seat of ccmpsuite available then you are limited to one core unless you have STAR-HPC or power tokes (depending on your version number). If you have multiple seats then you can check out multiple licenses, one for each core. Our server uses one ccmpsuite license per user and power tokes as needed to meet the needed computational power. Here is a link to a good discussion of licensing options. dmangesh likes this.

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May 16, 2019, 13:47		#2
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 17	Are you asking why 4 cores is beneficial? A computer scientist will probably give you a more technical answer, but it's all about RAM. Running a model in parallel distributes the calculations across multiple cores so that you can get around limits imposed by machine architecture (max RAM per core) and in some cases speed up your solutions by not running at the limits of what any one core can do on its own.

May 17, 2019, 09:52		#3
dmangesh New Member Mangesh Dake Join Date: Jan 2017 Location: USA Posts: 7 Rep Power: 9	Thanks for you reply. I don't think ccmpsuite licence allows for multicore processing. Have you used that option in STAR CCM+ before?

May 17, 2019, 13:35		#6
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,668 Rep Power: 65	Traditionally, you always need a ccmpsuite license to open anything in serial or parallel (unless you are using a power license or power-on-demand). I don't really follow what is the question being asked. What do you need to know beyond this? If you have only one ccmpsuite then you can only run in serial (or parallel with 1 process) since you don't have any more licenses to run additional processes. If you want to run parallel with 4 cores then you need 3 more ccmpsuite licenses or 3 more parallel licenses or some mix-and-match combination that somehow sums up to 4. The difference is that 3 ccmpsuites will cost you a lot more $ than 3 parallel licenses because the ccmpsuite license allows you to run more jobs.