>Does having only 256meg for the machine result in more >paging? Well, it depends. The issue is saturation, so you need to see what the storage values are.
Using SYSVIEW or RMF check the UIC value. In OS/390 the maximum value is 254 which indicates the "oldest" page in the system. High UIC values imply a relatively inactive storage reference pattern. Of course, this isn't universally true since you might only have 1 page at that age, versus having several thousand, but it's one value to check. Similarly check the Available Frame Queue (AFQ) value. If I recall, in OS/390 the range of values was (50,100) which means that below 50 frames, MVS would begin a page stealing cycle and stop when 100 was reached. This ensures that MVS keeps at least 100 pages on the AFQ. If the numbers are significantly higher than this, then there is no serious competition for storage. You can also check your page-in rates to see how many pages are being brought back in from auxiliary storage, since this also indicates that many of the pages being removed are required for execution, so once again this indicates a level of storage competition. Finally you can use a display like ACTIVITY (in SYSVIEW) to examine how many real-storage frames are in use by each address space. You can use the TOTAL command on that column to get a sense of how much memory is allocated in total. Basically this approach allows you to see how much is used, how close you are to the trigger point (AFQ), and how many "old" pages are remaining in memory. Hope this helps. Adam ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
