This is SPBench v0.4-alpha. This version includes the following changes: v0.4-alpha General: new batching mode: by time window new feature: frequency patterns (available only globally for n-sources benchmarks) yasm(v1.3.0) library is now provided within SPBench Metrics: new metric: instantaneous throughput new metric: instantaneous latency metric update: monitoring now register also the current frequency and batch size (not available for n-sources) metric update: monitoring now uses instantaneous metrics too metric update: average latency now shows min and max latency too CLI: new feature: users now can use the exec argument '-repeat <n_repetitions>' to run a benchmark n times new feature: users now can use -app and -ppi filters to select multiple benchmarks to execute Workload: new workload classes: Test and Huge new input video for lane detection with low-quality (360p) and mid-quality (720p) versions. Other: frequency parameter is now items per second instead of item interval update in the frequency control: now the waiting time is added before the item reading at the source update in the frequency control: now it counts the processing time of the previous item in the source as part of the waiting time PPI update: FastFlow release 3 was replaced by its last master version available in the GitHub repository (august 2022) new benchmark: ferret-fastflow pipe-farm using all-to-all inter-farm communication benchmark update: improved implementation for ferret-fastflow pipe-farm