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Underperform azure VM

R-Admin228 0 Reputation points
2024-07-06T13:43:41.5133333+00:00

Hi,

We recently using Azure VM with 16 vcpu to speed up the runtime of our modelling software, but the VM performance is significantly lower than expected.

We compared it with our physical pc (1 cpu, 32gb ram) which run the model in 6 hours, and the azure VM (16 vcpu, 64gb ram) which also run the model in 6 hours.

Why both have the same runtime? How to set the VM to fully utilized the vcpu ?

Azure Virtual Machines
Azure Virtual Machines
An Azure service that is used to provision Windows and Linux virtual machines.
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  1. Andreas Baumgarten 102.6K Reputation points MVP
    2024-07-06T13:57:14.28+00:00

    Hi @R-Admin228 ,

    there is a difference between the physical CPU(s) of the physical PC and the vCPU of an Azure Virtual Machine.

    Depending on the Azure VM SKU there is a ratio of vCPU/physical core. Which means 1 or 2 vCPU(s) using 1 core of a physical CPU in the Azure host. In addition the are maybe other VMs running on the same host in Azure.

    Source: Azure compute unit (ACU)

    Also there is a difference between the Azure VM Series what kind of processor is used in the Azure VM host computer. For instance:

    Dv2 series: 3rd Generation Intel® Xeon® Platinum 8370C (Ice Lake), Intel® Xeon® Platinum 8272CL (Cascade Lake), Intel® Xeon® 8171M 2.1GHz (Skylake), or the the Intel® Xeon® E5-2673 v4 2.3 GHz (Broadwell), or the Intel® Xeon® E5-2673 v3 2.4 GHz (Haswell)

    Dv5 series: Intel® Xeon® Platinum 8473C (Sapphire Rapids), Intel® Xeon® Platinum 8370C (Ice Lake)

    To get the highest performance of an Azure VM take a look on the link Azure compute unit (ACU) and compare the ACU value of the series. Higher ACU value = more performance.

    (If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

    Regards

    Andreas Baumgarten

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