Help Center/ Elastic Cloud Server/ Drawer/ Purchasing an ECS/ Advanced Settings/ CPU Options
Updated on 2026-02-27 GMT+08:00
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CPU Options

Description

  • CPU options

    You can set the number of virtual CPUs (vCPUs) contained in a CPU core by specifying CPU options.

    x86 ECSs support hyper-threading, which enables two threads to run concurrently on a single CPU core. Each thread is represented as a vCPU. When hyper-threading is enabled, each CPU core contains two vCPUs available to your workloads. Most x86 ECSs have hyper-threading enabled by default, which means a CPU core contains two vCPUs.

    Kunpeng magic core is a feature similar to hyper-threading. A CPU core can have two vCPUs concurrently available for different workloads. Most Kunpeng ECSs have magic core disabled by default, which means a CPU core contains one vCPU.

  • Enabling/Disabling hyper-threading

    When purchasing x86 ECSs, you can enable or disable hyper-threading by specifying CPU options. If you do not specify it, hyper-threading is enabled by default.

    When purchasing x86 ECSs, you can determine whether to enable hyper-threading based on your service requirements.
    • Enabled: Recommended for scenarios where CPU cores need to process a large amount of data and background tasks concurrently. Enabling hyper-threading can greatly improve compute performance.
    • Disabled: Recommended for compute-intensive workloads where performance is better without hyper-threading, such as computational materials science and other HPC scenarios.

    For details about ECS flavors that support hyper-threading, see A Summary List of x86 ECS Specifications.

    Enabling or Disabling Hyper-Threading

  • Enabling/Disabling magic core

    When purchasing Kunpeng ECSs, you can enable or disable magic core by specifying CPU options. By default, magic core is disabled.

    When purchasing Kunpeng ECSs, you can determine whether to enable magic core based on your service requirements.
    • Enabled: Recommended for workloads requiring higher compute density and concurrency, such as web services, middleware, big data processing, lightweight virtualization, and batch tasks. In these scenarios, enabling magic core can improve the compute throughput of each ECS.
    • Disabled: Recommended for pure compute-intensive workloads that demand high single-core performance and stability, such as HPC, simulation, and rendering. In these scenarios, disabling magic core can reduce thread contention and improve efficiency and consistency.

    For details about ECS flavors that support magic core, see A Summary List of Kunpeng ECS Specifications.

    Enabling Magic Core (with Hyper-Threading)

Parent Topic: Advanced Settings