Accelerating OpenSHMEM Collectives Using In-Network Computing Approach - Venkata, Manjunath Gorentla; Bloch, Gil; Shainer, Gilad; Graham, Richard (2019 31st International Symposium on Computer Architecture and High Performance Computing (SBAC-PAD), Computer Architecture and High Performance Computing (SBAC-PAD), 2019 31st International Symposium on, SBAC-PAD, 2019)