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It is used to monitor the server memory usage status, including current free memory, current total memory, current max memory, calculation result buffer, swap file number and swap file size etc. When the result buffer required by the user to carry out  large data calculation is greater than the configured result buffer, the calculation results will be changed to the disk. Quantity and size of files can be seen from swap file number and swap file size so that the user can use system resources more reasonably.  

➢Note: The system does not monitor the number and size of exchanged files by default. If the user wants to monitor the two messages, configure the attribute mem.serial.monitor=true in bi.properties.