HP 3000 Manuals HP 3000 Manuals
Recommendations For Using The Expert Facility Using the Expert facility will add a small amount of overhead to the GlancePlus program. On most systems this additional overhead is about 0.2% CPU; it should not cause any problems. On systems with many processes, the GlancePlus overhead might be higher. In this case, you can eliminate almost all the Expert facility's additional overhead by using the V command to set XLEVEL=LOW instead of HIGH. The high level analysis and suggested actions will not be available to you with this setting. You can use XLEVEL=LOW as a default and change it to HIGH only when you need more detailed information. See chapter 7 for details on how to select the default settings for GlancePlus. With XLEVEL=LOW and XPERT=DEMAND, the Expert facility adds no additional overhead. Press X to request an on-demand global analysis at any time. Since the overhead of the Expert facility on most systems is negligible, you can safely let it run in continuous mode. You may use XLEVEL=LOW and XPERT=CONTINUOUS to report any global problems and to accumulate the overview summary information (for the O command). Using XLEVEL=HIGH should not add significant overhead on most systems. (You can see the overhead by using GlancePlus to monitor itself under various settings on your system).
Hint The frequency of screen updates is one factor that affects GlancePlus's overhead most directly. If you set the update interval to its lowest setting (5 seconds), or press Return or Enter repeatedly to generate rapid updates, the CPU overhead can become very high. If you want to collect long-term summary information, set a longer update interval (60-90 seconds) to lower the GlancePlus overhead substantially. However in some cases, setting the update interval to longer than 90 seconds might not reduce the GlancePlus overhead. To keep process information from "backing up" in the measurement interface, information should be extracted every 60-90 seconds. Failure to do so can result in missing and inaccurate data. To avoid this problem if you select an update interval longer than 90-seconds, GlancePlus extracts the process data automatically once a minute to prevent backups.