This page (figure 7-6) permits specifying the size of GDB page cache used for working with ObjectLand and also to change the values of time-outs (waiting periods) used in shared access to GDB.
Figure 7-6. GDB property sheet, page “Settings”
Page cache is located in the main memory and contains GDB files fragments (pages) read from the disk. If it is necessary to read the required page from the file, the system checks its presence in the cache at first. If the page is found in the cache there is no reading from the disk which results in considerable speedup of working with GDB. At the same time excessively big cache diminishes the size of the main memory accessible for other system parts. By default, the cache size is 160 kilobytes. An experienced user can try to select another size value optimal for a particular GDB and a particular computer.
If the box Keep statistics of cache hits is checked, then in further references to the GDB property sheet the system will display in the same pane a number specifying percentage of references to the window “GDB properties” which were satisfied without actual reading of these pages from the disk. If in the course of work with GDB this percentage is often low, most probably pages replace each other in the cache too often. In this case it may be recommended to increase the cache size.
The pane Shared access contains two parameters determining the values of time-outs during the attempt to set data locking and during scanning of shared work sessions. These values are set on the basis of ObjectLand settings (see chapter 8 “System parameters setting”, subsection “Page “Shared Access””), but can be changed in the course of work.
 |  |
