Displaying and controlling memory usage
The high-speed connector uses system heap to maintain the endpoint information for each endpoint group descriptor that is loaded to the z/TPF system.
All system heap that is obtained by the high-speed connector uses the following naming convention: ICONN.groupname.usage.
- ICONN
- A high-level owner qualifier that is used for all high-speed connector system heap.
- groupname
- A mid-level owner qualifier that indicates the group name for the high-speed connector endpoint group.
- usage
- A low-level owner qualifier that indicates what the system heap storage is used for.
You can display how much system heap is in use for the high-speed connector endpoint groups that are defined by using the ZSTAT command with the SYSHEAP parameter specified.
The following example shows the system heap usage for all endpoint groups that are
defined.
User: ZSTAT SYSHEAP NAME-ICONN.*
System: STAT0126I 13.43.20 SYSTEM HEAP STORAGE OWNER DISPLAY
31-BIT HEAP 64-BIT HEAP
PREALLOCATED SIZE (KB) N/A 204800
PREALLOCATED IN USE (KB) N/A 110436
1MB FRAME STORAGE (KB) 3072 0
HEAP STORAGE IN USE (KB) 2516 110436
AVAILABLE LIST SIZE (KB) 556 94364
MAX STORAGE IN USE (KB) 2536 111824
SIZE OF HEAP (KB) 1691648 614400
-------------------------------------------------
RECOVERABLE SYSTEM HEAP
------------------------------------------------- _
SIZE OF RECOVERABLE SYSTEM HEAP (KB) 9437183
MAX 1MEG SEGMENTS IN USE SINCE LAST INIT 5
END OF DISPLAY+
TOTAL (KB) 31-BIT HEAP 64-BIT HEAP RECOVERABLE
linresp 388 0 388 0
tpf1http 264 0 264 0
tpfresp 252 0 252 0
tpfnores 204 0 204 0
SCBS 104 0 104 0
IMONGLOG 92 0 92 0
linnores 76 0 76 0
GCBS 4 0 4 0
END OF DISPLAY+The following example shows the system heap usage for a specific high-speed connector
endpoint group.
User: ZSTAT SYSHEAP NAME-ICONN.linresp.*
System: STAT0126I 13.48.00 SYSTEM HEAP STORAGE OWNER DISPLAY
31-BIT HEAP 64-BIT HEAP
PREALLOCATED SIZE (KB) N/A 204800
PREALLOCATED IN USE (KB) N/A 110436
1MB FRAME STORAGE (KB) 3072 0
HEAP STORAGE IN USE (KB) 2516 110436
AVAILABLE LIST SIZE (KB) 556 94364
MAX STORAGE IN USE (KB) 2536 111824
SIZE OF HEAP (KB) 1691648 614400
-------------------------------------------------
RECOVERABLE SYSTEM HEAP
------------------------------------------------- _
SIZE OF RECOVERABLE SYSTEM HEAP (KB) 9437183
MAX 1MEG SEGMENTS IN USE SINCE LAST INIT 5
END OF DISPLAY+
TOTAL (KB) 31-BIT HEAP 64-BIT HEAP RECOVERABLE
ASYNC REQUEST 188 0 188 0
ASYNC DATA 188 0 188 0
QUEUE 8 0 8 0
GROUP ITEM 4 0 4 0
END OF DISPLAY+You can configure the following areas of system heap storage:
- ASYNC REQUEST
- Related to the <maxAsyncMessage> element in the endpoint group descriptor file. The <maxAsyncMessage> element defines the maximum request size that can be passed on an asynchronous high-speed connector call. If the <maxAsyncMessage> value is greater than 0, the system preallocates a 4 KB block for every possible socket in the high-speed connector group.
- ASYNC DATA
- Related to the <maxAsyncData> element in the endpoint group descriptor file. The <maxAsyncData> element defines the maximum amount of user data that can be passed on an asynchronous high-speed connector call. If the <maxAsyncData> value is greater than 0, the system preallocates a 4 KB block for every possible socket in the high-speed connector group.
- QUEUE
- Related to the <qMaxDepth> element in the endpoint group descriptor file. The <qMaxDepth> element defines the maximum number of queued requests that wait to be processed by this group. The system allocates a minimum of one 4 KB block for the queue. More blocks are allocated for larger <qMaxDepth> values.