ApolloChoiceModelling forum

Dear Apollo team,

Thank you for producing this wonderful library!
Please forgive my poor writing, I am not from a English speaking country.

I am encountering a strange problem during the estimation of ICLV models.

I have 2 computers, one laptop with Inter i7-1065G7, and a desktop with AMD Ryzen 5600x. Both of them are using R4.1.1 on windows 10, with Apollo version 0.2.5. I found that Apollo on my AMD platform estimating the ICLV model far slower than my Inter Laptop, which is theoretically unlikely.

To ensure the problem doesn't come from my coding, I run example 24 on Apollo homepage, only changing the nCores in apollo_control to enable multi-threading. During the estimation, I can tell from the windows Task manager that the Intel CPU utilization is always at 100% for all 8 cores, while the AMD CPU utilization is only around 2%-10% for all 12 cores. None of the AMD cores get fully used.

By the way I also do the same test based on Apollo example 16, and the multi-threading works perfectly on both CPU platforms... this completely confused me.

Is this a bug? Or did I do something wrong in setting my environment for the AMD platform?
Any feedback would be appreciated.

Best Regards,
Gao

Gao

it doesn't make sense that this problem happens with hybrid choice but not with mixed logit, as the multi-threading part of the code is the same.

Can I suggest that you run some tests using the apollo_speedTest function on both machines, for both of the below examples, and then send us the output in reply to this post.

Stephane

Hi, Professor Stephane

My apologies for the late reply. I actually solve this myself by resetting my windows 10... so I cannot reproduce this problem currently. Once I met the problem again (I hope not) I will try to run apollo_speedTest and show you the results.

Sorry to bother you.

Best regards,
gao