VME Readout at and Below the Conversion Time Limit
VME Readout at and Below the Conversion Time Limit
复制标题
等于或低于转换时间限制的 VME 读数
DOI：
10.1109/tns.2018.2884979
复制
发表时间：
2018
影响因子：
1.8
通讯作者：
H. Johansson
中科院分区：
文献类型：
--
作者：
M. Munch;J. Jensen;B. Loher;H. Törnqvist;H. Johansson
现代触发核物理实验的可达到的采集率在很大程度上取决于读出软件，以及所使用的硬件给出的限制。本文提出了一种异步读出方案，该方案可以显著提高基于Versa模块的欧卡数据采集系统的生存时间。在基本数据传输操作方面，描述了该方案和其他读出方案的详细性能分析。对新方案和同步方案在两个系统上的性能进行了测试。测量结果与详细描述很好地吻合。对于之前使用同步读出的第二个系统，死区时间比率为20 kHz触发请求频率，与最近的竞争者相比降低了30%，允许在同一时间多记录10%的事件。研究了网络与单核处理器读出任务之间的相互作用。根据提供给操作系统内核用于网络传输的数据区块的大小，可以观察到生存期比率损失几个百分点。通过适当地选择块大小，可以减轻这种影响。
The achievable acquisition rates of modern triggered nuclear physics experiments are heavily dependent on the readout software, in addition to the limits given by the utilized hardware. This paper presents an asynchronous readout scheme that significantly improves the livetime of an otherwise synchronous triggered Versa Module Eurocard Bus-based data acquisition system. A detailed performance analysis of this and other readout schemes, in terms of the basic data transfer operations, is described. The performance of the newly developed scheme as well as synchronous schemes on two systems has been measured. The measurements show excellent agreement with the detailed description. For the second system, which previously used a synchronous readout, the deadtime ratio is at a 20-kHz trigger request frequency reduced by 30% compared to the nearest contender, allowing 10% more events to be recorded in the same time. The interaction between the network and readout tasks for single-core processors is also investigated. A livetime ratio loss of a few percents can be observed, depending on the size of the data chunks given to the operating system kernel for network transfer. With appropriately chosen chunk size, the effect can be mitigated.
DOI：
10.1016/j.nima.2010.02.120
发表时间：
2010-04-21
影响因子：
1.4
作者：
Baba, H.;Ichihara, T.;Shimoura, S.
通讯作者：
Shimoura, S.