SQL Server Integration Services ( SSIS ) Parallel Processing
Parallel execution improves the performance on the computers that have multiple physical or logical processors. To support parallel execution of different tasks in the package, SSIS uses two properties: MaxConcurrentExecutables and EngineThreads.
In my next article on SSIS Parallel processing I will cover how you can utilize the parallel processing capabilities of SSIS. In the later part of this article, I will provide some tips for SSIS Performance optimization and finally I will talk of what you need to take care of when executing your SSIS Package on 64-bit computers.
Refer this link for more details.
https://www.sql-server-performance.com/articles/biz/SSIS_An_Inside_View_Part_4_p1.aspx