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The Question is: Usage of SYSGEN GBLPAGFIL? In order to see what is going on, $INSTALL does provide some (incomplete) information about GBLPAGES. $INSTALL L/G/SUMM does tell me gblpages in use/total and the gblsections in use (omitting the number of total section available). The number of GBLSECTIONS can be found MCR SYSGEN show GBL*. GBLPAGFIL is set to some value, how can I find out something about the actual usage in the running system of this value (to make sure the value is suffient and not excessive)?. It would be very nice, if INSTALL could simply show all these values in the summary statement in a reasonable way. regards winfried h. oppermann The Answer is : INSTALL is the user command interface into the image activator, and is not particularly intended as a mechanism for monitoring system page file usage. The mechanisms underneath INSTALL do use global sections and the global section system services, but these installed sections are typically file-backed sections, and not pagefile-backed sections. Global sections (created via INSTALL or via system service) will clearly use GBLPAGES and GBLSECTS, but the underlying page table data structures are small and thus reasonable overconfigurations of these parameters are not particularly wasteful of memory. The GBLPAGEFIL prevents excess use of the pagefile, but having sufficient pagefile configured is also not particularly wasteful of resources given the current costs of large-scale disk storage. For information on the system configuration, please see the $getsyi service (or f$getsyi lexical) and FREE_GBLPAGES, CONTIG_GBLPAGES, FREE_GBLSECTS, PAGEFILE_FREE, PAGEFILE_PAGE, etc. In the specific case of the GBLPAGFIL parameter, this is a dynamic parameter that controls the amount of pagefile that can be allocated for use as backing storage for global sections, meaning that the PAGEFILE_FREE and PAGEFILE_PAGE parameters would be among the most interesting, as well as (obviously) the DCL command SHOW MEMORY. If you wish to reduce the amount of storage used in the pagefile, you can use file-backed sections. Some of the related topics include (7752), (6536), and (5002).
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