It is an open question whether there exist algorithms that cannot be parallelized. Some that are most likely to be inherently sequential are listed here: https:

It is an open question whether there exist algorithms that cannot be parallelized. Some that are most likely to be inherently sequential are listed here: https://en.wikipedia.org/wiki/P-complete#P-complete_problems https://en.wikipedia.org/wiki/P-complete#P-complete_problems