# Parallel File I/O (parallel-ascii-multifile)

Version's name: Parallel File I/O (parallel-ascii-multifile) ; a version of the Parallel File I/O program.
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Patterns and behaviours: Sequential ASCII file I/O ·
Implemented best practices: Parallel multi-file I/O ·

This is the simplest parallel file I/O for ASCII files, where every process reads or writes to a unique file, i.e. the number of processes equals the number of files. This may be disadvantageous for some situations, e.g. for checkpointing if needing to restart a computation on a different number of processes.

The following pseudo-code shows the process for writing data.

get_my_process_id(proc_id)
filename = "file" + to_string(proc_id) + ".txt"
open_file(filename)
write_ascii_data_to_file(data, filename)
close_file(filename)


The process is reversed when reading data from file, as follows.

get_my_process_id(proc_id)
filename = "file" + to_string(proc_id) + ".txt"
open_file(filename)
read_ascii_data_from_file(data, filename)
close_file(filename)