[GregarianChild]

Speculation killed dataflow. (Attributed to Arvind 2005)

There have been many attempts at making data-flow applications compatible with general purpose computation workloads. They all failed to beat the performance of comparable conventional processors. [1] lists the following disadvantages of data-flow:

- Debugging difficult (no precise state)

- Interrupt/exception handling is difficult (what is precise state semantics?)

- Implementing dynamic data structures difficult in pure data flow models

- Too much parallelism? (Parallelism control needed)

- High bookkeeping overhead (tag matching, data storage)

- Instruction cycle is inefficient

[1] https://course.ece.cmu.edu/~ece740/f13/lib/exe/fetch.php?med...