A station running on a QNX-based platform has the following additional PlatformServicesContainer properties, as shown in Figure 119.
These properties are in addition to the other standard configuration properties. Each of these additional properties has a read-only Status field on the far right side, plus the following configuration fields:
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RAM Disk Size
Has two configurable fields:
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Min Free — minimum allowable free size in %. If status is not Ok, a “Low RAM disk space” warning is overlaid in all Workbench views of the station.
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Size —in MB, where default is 16 for a JACE-4/5 series, 8 for a JACE-2 series, 32 for a JACE-6 series, or 48 for a JACE-7 series. Specifies the size of RAM disk used to store history and alarm files. Specifies size of RAM disk used to store history and alarm files.
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Java Heap
Has one configurable “Min Free” field, in MB. Specifies the minimum free Java heap size, in MB, against which the station compares (tests) for low memory conditions, that is excessive Java heap. The default varies according to JACE model.This test automatically runs once a minute. If the heap free byte count is less than the defined minimum free heap size, a “low memory warning” appears in all Workbench views of the station. The warning is a yellow message box overlaid on any new view accessed, or on any current view that is refreshed. This warning is removed when the heap free byte count rises above the defined minimum size—such as might occur if enough components are deleted from the station.
All memory statistics, including those for heap, are accessible on a station opened in Workbench, via the Resource Manager view of the Station component.
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Open File Descriptors
Has one configurable “Min Free” field, related to number of files (and/or open sockets). Specifies the maximum amount of file descriptors that can be used. That is, the read-only “Max Open” number minus the “Min Free” amount. File descriptors are used for histories, modules, and Fox connections If exceeded a “Station has too many open files or sockets” warning is overlaid in all Workbench views of the station.
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Free RAM
Has one configurable “Min Free” field, in KB. Specifies the minimum RAM that can be left free during station operation. If status is not Ok, a “Low free RAM” warning is overlaid in all Workbench views of the station.
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Disk Space
Has one configurable “Min Free” field, in %. Specifies the minimum percentage of disk storage that can be left free during station operation. Below this amount, a “Platform running low on disk space” warning is overlaid in all Workbench views of the station.
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Files
Has one configurable “Min Free” field, to specify the minimum number of free files available during station operation. Below this amount, a related platform warning appears. Note that starting in AX-3.6, the PlatformServiceContainer status property “Filesystem” includes both the current number of files and the maximum number of files for each partition on a QNX-based JACE.
Current statistics for memory, heap, and file descriptors (fd) are accessible on a station opened in Workbench, via the Resource Manager view of the Station component.
Also see previous section, configuration.