Should log file streams be opened/closed on each write or kept open during a desktop application's lifetime?

Question

Should log classes open/close a log file stream on each write to the log file or should it keep the log file stream open throughout the application\'s lifetime until all log

Answer 1

For large intensive applications, what I usually do is I keep the log file open for the duration of the application and have a separate thread that flushes log content in the memory to HDD periodically. File open and close operation require system calls, which is a lot of work if you look into lower level.