is not a regular file (it may be a directory). it cannot be attached to the
时间: 2023-09-19 13:02:15 浏览: 233
“is not a regular file (it may be a directory). it cannot be attached to the” 这句话意味着我们无法将它作为附件添加。
在计算机系统中,文件可以分为两类:普通文件和目录。普通文件是指存储有特定数据的文件,可以被打开、读取、编辑和附加到其他文件中。而目录则是用于组织和存储文件的容器,其中包含了其他文件和子目录。
这句话中的“is not a regular file (it may be a directory)”表示我们选中的文件不是一个普通文件,可能是一个目录。由于目录本身不是具体的数据文件,而是一个容器,所以无法直接将它作为附件添加到其他文件中。
附件通常用于向电子邮件、文档或其他文件中添加额外的材料或数据。它可以是图像、音频、视频、文本文件等等。但由于目录本身的特殊性质,我们无法将其作为附件添加到其他文件中。如果我们需要将目录及其内容发送或共享,一种替代方案是将目录打包成一个压缩文件(如ZIP),然后将压缩文件作为附件发送或共享。
总之,“is not a regular file (it may be a directory). it cannot be attached to the”说明了选中的文件不是普通文件,不能直接作为附件添加到其他文件中。这是由于目录特殊的组织和存储功能所致。
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When all of a vertex’s input channels become ready a new execution record is created for the vertex and placed in a scheduling queue. A disk-based channel is considered to be ready when the entire file is present. A channel that is a TCP pipe or shared-memory FIFO is ready when the predecessor vertex has at least one running execution record. A vertex and any of its channels may each specify a “hardconstraint” or a “preference” listing the set of computers on which it would like to run. The constraints are combined and attached to the execution record when it is added to the scheduling queue and they allow the application writer to require that a vertex be co-located with a large input file, and in general let the scheduler preferentially run computations close to their data.数据库中这些具体能做什么
这段文本描述了一个分布式计算系统中的调度和执行过程,其中包括了对输入通道的就绪状态判断、执行记录的创建和调度队列的管理,以及对计算节点的硬性约束和偏好设置等。如果将这个系统应用到数据库中,可以实现分布式计算和查询,提高计算效率和并发能力。具体来说,可以将数据库中的查询和计算任务分解成不同的子任务,分配到不同的计算节点上进行处理,通过就绪状态判断和调度队列的管理,实现任务的并发执行和优化调度。同时,可以通过硬性约束和偏好设置,将计算节点与数据节点相结合,实现数据本地化和计算本地化,从而进一步优化计算效率和响应速度。
Another example is the SRIOV_NET_VF resource class, which is provided by SRIOV-enabled network interface cards. In the case of multiple SRIOV-enabled NICs on a compute host, different qualitative traits may be tagged to each NIC. For example, the NIC called enp2s0 might have a trait “CUSTOM_PHYSNET_PUBLIC” indicating that the NIC is attached to a physical network called “public”. The NIC enp2s1 might have a trait “CUSTOM_PHYSNET_INTRANET” that indicates the NIC is attached to the physical network called “Intranet”. We need a way of representing that these NICs each provide SRIOV_NET_VF resources but those virtual functions are associated with different physical networks. In the resource providers data modeling, the entity which is associated with qualitative traits is the resource provider object. Therefore, we require a way of representing that the SRIOV-enabled NICs are themselves resource providers with inventories of SRIOV_NET_VF resources. Those resource providers are contained on a compute host which is a resource provider that has inventory records for other types of resources such as VCPU, MEMORY_MB or DISK_GB. This spec proposes that nested resource providers be created to allow for distinguishing details of complex components of some resource providers. During review the question came up about “rolling up” amounts of these nested providers to the root level. Imagine this scenario: I have a NIC with two PFs, each of which has only 1 VF available, and I get a request for 2 VFs without any traits to distinguish them. Since there is no single resource provider that can satisfy this request, it will not select this root provider, even though the root provider “owns” 2 VFs. This spec does not propose any sort of “rolling up” of inventory, but this may be something to consider in the future. If it is an idea that has support, another BP/spec can be created then to add this behavior.
另一个例子是SRIOV_NET_VF资源类,它由支持SRIOV的网络接口卡提供。在计算主机上存在多个支持SRIOV的网卡的情况下,可以对每个网卡标记不同的定性特征。例如,名为enp2s0的网卡可能具有一个名为“CUSTOM_PHYSNET_PUBLIC”的特征,表示该网卡连接到名为“public”的物理网络。名为enp2s1的网卡可能具有一个名为“CUSTOM_PHYSNET_INTRANET”的特征,表示该网卡连接到名为“Intranet”的物理网络。我们需要一种表示这些网卡都提供SRIOV_NET_VF资源,但这些虚拟函数与不同的物理网络相关联的方式。在资源提供者的数据建模中,与定性特征相关联的实体是资源提供者对象。因此,我们需要一种表示支持SRIOV的网卡本身是具有SRIOV_NET_VF资源库存的资源提供者的方式。这些资源提供者包含在计算主机上,计算主机本身是一个资源提供者,具有其他类型资源(如VCPU、MEMORY_MB或DISK_GB)的库存记录。
该规范提议创建嵌套资源提供者,以区分某些资源提供者的复杂组件的详细信息。在审查过程中,出现了一个问题,即如何将这些嵌套提供者的数量“合并”到根级别。想象这样的情景:我有一张网卡,其中有两个物理功能(PFs),每个PF只有1个可用的虚拟功能(VF),我收到一个请求需要2个VF,并且没有任何可区分它们的特征。由于没有单个资源提供者能够满足此请求,它将不会选择此根提供者,即使根提供者“拥有”2个VF。该规范没有提议对库存进行任何形式的“合并”,但这可能是将来要考虑的事情。如果这是一个得到支持的想法,可以创建另一个BP/spec来添加此行为。
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