Behavior when using distributed CPUs

Question

question

Ryusuke T asked Jul 07 2023 at 1:43 AM Ryusuke T commented Jul 10 2023 at 9:34 AM

Behavior when using distributed CPUs

Hi,

I'm doing distributed CPU verification.

I noticed some strange behavior there.

First, confirm that you can connect to the external CPU, and then execute Optquest using the distributed CPU.

At this time, it can be confirmed that the distributed CPU processing is going well because the number of CPUs is exceeded.

Next, I disconnected the network of the external PC and confirmed the disconnection from the properties.

However, it seems that the number of CPUs used by OptQuest exceeds the number of CPUs it owns, and distributed CPUs continue to be enabled.

what is happening?

Software Version:

FlexSim 23.0.8

optquest use distributed cpus

image.png (29.0 KiB)

image2.png (49.9 KiB)

image3.png (40.3 KiB)

image4.png (68.1 KiB)

· 3

Joerg Vogel commented · Jul 07 2023 at 6:37 AM

@Ryusuke T , you are aware of multi-threading? A CPU computes two threads.

0 ·

Jordan Johnson ♦♦ Joerg Vogel commented · Jul 07 2023 at 7:26 PM

This question isn't related to hyper threading. If the user specifies that 2 CPUs are available, then only two child processes should be launched. The issue is that more child processes are being launched than were specified.

2 ·

Jason Lightfoot ♦♦ Joerg Vogel commented · Jul 07 2023 at 11:12 AM

Hyper-Threading or Simultaneous Multi-Threading is where a single physical core presents two logical cores to the operating system for job allocation.

0 ·

______

Cookie preferences

Your privacy is important to us and so is an optimal experience. To help us customize information and build applications, we collect data about your use of this site.

May we collect and use your data?

Learn more about the Third Party Services we use and our Privacy Statement.

Strictly necessary – required for our site to work and to provide services to you

These cookies allow us to record your preferences or login information, respond to your requests or fulfill items in your shopping cart.

YES

Improve your experience – allows us to show you what is relevant to you

These cookies enable us to provide enhanced functionality and personalization. They may be set by us or by third party providers whose services we use to deliver information and experiences tailored to you. If you do not allow these cookies, some or all of these services may not be available for you.

YES

NO

Customize your advertising – permits us to offer targeted advertising to you

These cookies collect data about you based on your activities and interests in order to show you relevant ads and to track effectiveness. By collecting this data, the ads you see will be more tailored to your interests. If you do not allow these cookies, you will experience less targeted advertising.

YES

NO

Are you sure you want a less customized experience?

We can access your data only if you select "yes" for the categories on the previous screen. This lets us tailor our marketing so that it's more relevant for you. You can change your settings at any time by visiting our privacy statement

Your experience. Your choice.

We care about your privacy. The data we collect helps us understand how you use our products, what information you might be interested in, and what we can improve to make your engagement with Autodesk more rewarding.

May we collect and use your data to tailor your experience?

Explore the benefits of a customized experience by managing your privacy settings for this site or visit our Privacy Statement to learn more about your options.

Answer 1 · 2023-07-07T20:30:36Z

Jordan Johnson answered Jul 07 2023 at 8:30 PM Ryusuke T commented Jul 10 2023 at 9:34 AM

It is hard to say exactly what is happening. Based on your description, I would expect only 20 processes to run on the localhost, and none on the other computer. The optimizer should not show more than 20 active processes concurrently. It is not correct that there are 27.

I'm unable to replicate the issue on two computers on my network. If the "Use Distributed CPUs" box is checked, the number of concurrent processes is within what I specified in global preferences:

If one of the connections is not available, then no processes are created for that connection, and the total number of processes is less:

In order to further support you, I will need more information.

Do you get an exception in the system console, reporting that the disconnected host did not return valid ports?
Does the connected webserver report a request to create child processes, like this? Or does it not respond?
Are you sure the "Use Distributed CPUs" box was not checked?

It may be helpful if you could record a video, or if we could arrange a web meeting.

1688761611655.png (72.4 KiB)

1688761646148.png (73.5 KiB)

· 1

question