There are various operating system settings that MarkLogic prescribes for best performance. During the startup of a MarkLogic Server instance, some of these parameters are set to the recommended values. These parameters include:

• File descriptor limit
• Number of processes per user
• Swappiness
• Dirty background ratio
• Max sectors
• Read ahead

For some settings, Info level error log messages are recorded to indicate that these values were changed.  For example, the MarkLogic Server error log might include a line similar to:

2020-03-03 12:40:25.512 Info: Reduced Linux kernel swappiness to 1
2020-03-03 12:40:25.512 Info: Reduced Linux kernel dirty background ratio to 1
2020-03-03 12:40:25.513 Info: Reduced Linux kernel read ahead to 512KB for vda
2020-03-03 12:40:25.513 Info: Increased Linux kernel max sectors to 2048KB for vda