在计算节点上通过代理收集数据会与用户的作业争夺内存和CPU时间。
Collecting data with agents on compute nodes can suck memory and CPU cycles from the user's jobs.
另外，可以按时间、节点或集合计算查询负载。
Additionally, you can evaluate the query load based on the time, nodes, or collections.
节点包含许多用于应用和解析序列的选项，包括字面值、来自 XPath 谓词的表达式计算和特定时间长度内的序列。
The nodes have a wide range of options for applying and parsing sequences, including literal values, expressions calculated from an XPath predicate, and sequences bounded by a given length of time.
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