The multi-threading property of SHAPEIT2 proved to be very convenient on clusters with low memory nodes (ex: only 2-3Gb of RAM per CPU core). For instance, on a single 8 CPU node, it is much more memory efficient to phase with SHAPEIT2 8 chunks of data sequentially each using 8 threads than running the 8 chunks in parallel. Both strategies need roughly the same running times while the second requires sharing of memory between the 8 chunks.
