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Multi-threaded Output in CMS using ROOT
2019
EPJ Web of Conferences
CMS has worked aggressively to make use of multi-core architectures, routinely running 4- to 8-core production jobs in 2017. The primary impediment to efficiently scaling beyond 8 cores has been our ROOT-based output module, which has been necessarily single threaded. In this paper we explore the changes made to the CMS framework and our ROOT output module to overcome the previous scaling limits, using two new ROOT features: the TBufferMerger asynchronous file merger, and Implicit
doi:10.1051/epjconf/201921402016
fatcat:p5bgyvfzkvdxnjcpk7zwrsuttm