红帽全球峰会20.36.4. 显示有关给定域的虚拟 CPU 计数的信息
virsh vcpucount 命令需要一个 域名 或域 ID
vcpucount 可以采用以下参数：
--maximumget maximum on vcpus--activeget number 当前 active vcpus--live从运行的客户机虚拟机获取值--configget value 用于下一次引导时--current根据当前客户机虚拟机状态获取值- 返回的
--guest数量是从客户机的视角获得
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