Deadlock ignorance technique is mostly using now a days In both cases i.e. system and real life scenario.
Lets Explain with Example
If deadlock occur then we restart the computer. Operating system has no particular code for it. We don’t want to affect the performance. Because, if we add particular code for deadlock prevention then functionality of OS will be increased. As a result, performance of operating system (speed) will be reduced. As deadlock never occur daily so it is a rare case that’s why we have no need to increase the functionality of OS