How much memory is needed?

No exact number can be given as the recommendation for the amount of memory needed for a system running InfoPrint Manager. The amount of memory depends on how many jobs are going through the system at what frequency, the size, complexity, and data type of the jobs, and what else is running on the system.

With InfoPrint Manager, the more memory the better.InfoPrint Manager performs best when it has enough memory that it does not need to use paging space. That is, the more paging space it must use, the worse the performance.

What defines a memory bound system? If the number of active virtual memory pages exceed the amount of real memory pages, page space is used for those pages that cannot be kept in real memory.

To determine if InfoPrint Manager for AIX is using paging space, use the vmstat or topas command. With vmstat, look at the paging columns, such as re, pi, po, fr, sr, and cy. On a system with no paging, these columns contain zeros. On a machine with memory constraints, you see the free memory frames (fre) go toward zero, and then paging begins.

To start the vmstat command, enter:

vmstat interval  length

To tune the memory load control mechanism of AIX, use the schedo command. The schedo command is part of the bos.perf.tune fileset, and it can be found in the /usr/sbin directory. The schedo command lets you tune the load control mechanism.

For information and recommendations for changing values for your configuration, see:

  • Optimizing AIX 7.1 Performance tuning, which is available at http://www.ibm.com/redbooks.
  • IBM eServer pSeries Information Center, which is available at http://publib.boulder.ibm.com/infocenter/pseries/.