# Parallel

- [Parallel by Chr (py)](/getting-started/developer-tutorials/concurrent-computing-tutorials/parallel/parallel-by-chr-py.md): This applet tutorial performs a SAMtools count using parallel threads.
- [Parallel by Region (py)](/getting-started/developer-tutorials/concurrent-computing-tutorials/parallel/parallel-by-region-py.md): This applet tutorial performs a SAMtools count using parallel threads.
- [Parallel by Region (sh)](/getting-started/developer-tutorials/concurrent-computing-tutorials/parallel/parallel-by-region-sh.md): This applet performs a basic SAMtools count on a series of sliced (by canonical chromosome) BAM files in parallel using wait.
- [Parallel xargs by Chr](/getting-started/developer-tutorials/concurrent-computing-tutorials/parallel/parallel-xargs-by-chr.md): This applet slices a BAM file by canonical chromosome and performs a parallelized SAMtools view.