A question about 5g Lena performarnce with a large number of UE-nodes

[jianming Yi]

Hello everyone,

I used the example: lena-lte-comparison-campaign to do the simulation with 8284 UEs in UE-containner. There is a small modification: support the moving UEs. Also add one ability to read the trace file generated in SUMO and assign the position to the nodes. 

The simulation started from around 16 o'clock yesterday (11.08.2022). However, it is still in this status until now. 

I checked my CPU utilization and found that it uses one CPU to do this computation and think, if it is possible to use multi-thread to do this computation so that the computation can be accelerated. Have you this experience or give me one feedback, if ns-3 could do the multiple-thread?  Thank you for your help in advance!

Best regards

Charlie

[Tom Henderson]

>
> I checked my CPU utilization and found that it uses one CPU to do this
> computation and think, if it is possible to use multi-thread to do this
> computation so that the computation can be accelerated. Have you this
> experience or give me one feedback, if ns-3 could do the
> multiple-thread?  Thank you for your help in advance!
>

ns-3 is not multi-threaded, and although it can be partitioned to run on
different CPUs or cores using MPI, it is difficult to do so on shared
wireless channels.

The LTE documentation states:

#. The simulator should scale up to tens of eNBs and hundreds of User
Equipment (UEs).

so running with thousands of UEs will likely require you to make some
modifications to the models to introduce more abstractions that are
compatible with your study.

- Tom

[Guy Gabay]

Hello, I would like to combine MPI with lena 5g moodle, I wanted to ask if this combination is possible?

ב-יום חמישי, 11 באוגוסט 2022 בשעה 17:49:24 UTC+3, Tom Henderson כתב/ה:

[Tom Henderson]

Presently, I believe that you need to partition the MPI nodes with
PointToPoint links; that is, you could have one 5G network on one node,
and a separate 5G network on another node, but you cannot split a single
5G network.

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[Guy Gabay]

Hi Tom, I've been trying to mix MPI module in some lena 5g codes,

every time i get an error:

NS_ASSERT failed, cond="tAbsolute.IsPositive()", +0.002000000s 0 file=/ns-allinone-3.38/ns-3.38/src/mpi/model/distributed-simulator-impl.cc, line=485

NS_FATAL, terminating.

Do you have any idea how to solve these?

ב-יום רביעי, 18 באוקטובר 2023 בשעה 06:53:34 UTC+3, Tom Henderson כתב/ה:

[Tom Henderson]

I do not know since I don't use MPI; you could ask on the ns-3-users
list where some MPI users subscribe. If you do so, please provide more
information there about what you are testing specifically.

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[Guy Gabay]

Hey Tom, I think I managed to solve the problem by uncommenting this line

I'm currently trying to run two networks at the same time and I encountered the same problem as here:

https://groups.google.com/g/ns-3-users/c/pOaVDnlA-YU/m/9ZF6-lhnAQAJ

ב-יום ראשון, 22 באוקטובר 2023 בשעה 06:10:51 UTC+3, Tom Henderson כתב/ה: