A fix is available
APAR status
Closed as program error.
Error description
Source MAL transmission buffer shortage can occur in a heavily loaded CICSPlex environment. Because the CONL transaction depends on the EYU0CLER method to process almost everything that is coming from a MAS environment, a heavily loaded system, could cause a buffer shortage (EYUCL0122E). In this case there were over 1800 of the 2048 available buffers in use for topology information and messages (TSTP and XMLM MALs). EYURCLSD had CLSD_FRE_SMTB had zeros for an address and the CLSD_FLAGS = x'80' CLSD_NO_SMTBS.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All CICSPlex/SM V3R1M0 Users * **************************************************************** * PROBLEM DESCRIPTION: Elongated MAS CONNECT processing may * * occur in a heavily loaded CPSM * * environment. This is more likely to * * occur when a CMAS is started while a * * large number of MASes that will connect * * to the CMAS are already active. * * * * In some situations, this may result in * * MAS communications buffer shortages, * * which will be indicated by message * * EYUCL0122E. * **************************************************************** * RECOMMENDATION: After applying the PTF that resolves this * * APAR, all CMASes and MASes must be * * restarted. Note that the restarts do not * * need to occur at the same time. * * * * Before restarting any CMAS, it is necessary * * to use DFHCSDUP to upgrade the CPSM CSD * * groups for all CMASes. The CMASes must then * * be cold started to pick up the updates. * * * * If transaction security is active in CMAS * * regions, the XMLT transaction should be * * defined to the Security Manager. The access * * requirements for this transaction is the * * same as other CICSPlex SM transactions, for * * example XLST. * * * * If a monitor that purges long running tasks * * is active in CMAS regions, the new XMLT * * transaction should be excluded from being * * purged. * **************************************************************** The standard method that a MAS uses to ship data to the CMAS to which it is connected is: 1. Acquire a source MAL transmission buffer (SMTB) from a pool of pre-allocated buffers. 2. Place the data in the buffer. This consists of the data and the parameter list (MAL - method argument list) of the method that will run in the CMAS and process the data. 3. Chain the buffer to the CMAS's MAS receive link task. This is method EYU0CLER (CLER) running under transaction LEER in the CMAS. 4. Issue a cross memory POST for the LEER task to inform it that it has work to process. 5. The LEER task retrieves the buffer from its queue and calls the method whose MAL is in the buffer. For the most part this method is sufficient to handle all traffic from MASes to the CMAS. However, since all MASes connected to the CMAS use the same pool of SMTBs (2048 elements) and since all SMTBs are processed by the same task in the CMAS (LEER), if a large number of buffers need to be processed concurrently, the LEER task may get backed up, resulting in slow processing and possible SMTB shortages (EYUCL0122E). This is especially true during MAS connect processing, when many MAS generated messages are shipped to the CMAS (MAL XMLM) for inclusion in the EYULOG and many CICS resource updates are sent to the CMAS (MAL TSTP) so that the Topology resource maps can be updated.
Problem conclusion
To alleviate possible transmission congestion, the processing of XMLM and TSTP requests have been modified to not use the normal SMTB process. XMLM requests will now be shipped to the CMAS by writing the message to a CPSM queue structure. A new long running task in the CMAS will check for messages written to the queue, and when they arrive, will call method EYU0XMLM (XMLM) to process them. Additionally, CMAS generated messages will also use this process to send messages to the EYULOG. The following updates were made to affect this change: - New method EYU0XMLT (XMLT) has been created to run as a long running task under transaction XMLT in the CMAS to process all writing to the EYULOG in the CMAS. During initialization, it will allocate a wait queue to receive messages destined for the EYULOG, place the queue ID into the MSG component Major Object Environment Block (MOEB), and then go into a wait. When XMLT is posted because of a message being written to the wait queue, it will retrieve the message from the queue and then call method EYU0XMLT (XMLT) to write the message to the EYULOG. When XMLT is posted for termination, it will mark the queue unavailable, and then process any remaining messages already in the queue before terminating. XMLT will issue new message EYUXM0100I to the EYULOG at startup, and new message EYUXM0101I to the EYULOG at normal termination. If the EYULOG is not available during CMAS initialization, XMLT will issue new message EYUXM0110W to the joblog, console, and EYULOG. If this occurs, no messages will be written to the EYULOG. If an error causes XMLT to terminate abnormally, it will issue new message EYUXM0120E to the joblog, console, and EYULOG. If this occurs, the original methods of writing to the EYULOG will be used. The text of the new messages is as follows: EYUXM0100I Consolidated message log long running task started EYUXM0101I Consolidated message log long running task terminated EYUXM0110W Consolidated message log not available EYUXM0120E Consolidated message log long running task terminated abnormally - The CMAS CSD group EYU310G0, which is contained in EYU964G0, has been updated to include a definition for the new XMLT transaction. - Method EYU0XMIN (XMIN), which initializes the MSG component, has been updated to include a new function call (SETQUE) for a MAS environment to retrieve XMLT's wait queue ID and store it in the MSG MOEB. If the queue ID is not available, XMIN will issue new message EYUXM0020W to the joblog, console, and EYULOG. If this occurs, the MAS will deliver messages to the CMAS by shipping XMLM requests through SMTBs. The text of the new message is as follows: EYUXM0020W Consolidated message log queue not allocated - Method EYU0XLBV (XLBV), which is called in a CMAS and MAS to call the initialization routines for CPSM components, has been updated: - to start XMLT during CMAS initialization. - to call XMIN for the new SETQUE function during MAS initialization after the QUE component has completed initialization, to retrieve the wait queue ID and store it in the MAS's MSG MOEB. - Method EYU0XMSM (XMSM), which is called to issue messages in both a CMAS and MAS environment, has been updated to check if the XMLT wait queue is available. If it is, XMSM will write the EYULOG message to the queue. If the queue is not available or an error occurs writing to the queue: - if XMSM is running in a CMAS it will call XMLM directly. - if XMSM is running in a MAS it will ship the XMLM request to the CMAS through an SMTB. - Method EYU0XMLM (XMLM), which writes messages to the CMAS EYULOG, has been updated to detect if it has been called from XMLT, and if so to process accordingly. - Method EYU0XMTM (XMTM), which is called by method EYU0XLES (XLES) during CMAS and MAS termination to terminate the MSG component, has been updated to add two new functions: - function CLRQUE, which is called only in a MAS, clears the XMLT queue ID from the MSG MOEB. - function TRMXMLT, which is called only in a CMAS, will POST XMLT's termination ECB. - Method EYU0XLES (XLES), which is called during CMAS and MAS termination to call the termination routines for CPSM components, has been updated to call XMTM for the CLRQUE function in a MAS and for the TRMXMLT function in a CMAS. - Method EYU0CLEV (CLEV), which runs as a long running task in a MAS under transaction COI0 to receive requests from the CMAS, has been updated to call XMTM for the CLRQUE function when it is posted for CMAS termination. TSTP requests will now execute directly in the MAS. The following updates were made to affect this change: - Methods EYU0NLXD (NLXD) and EYU0NMMC (NMMC), which run in a MAS and send TSTP requests to the CMAS through SMTBs, have been updated to call TSTP directly. - Method EYU0TSTP (TSTP) has been updated to check if it is executing in a MAS and if so, to check if the CMAS supports TSTP execution in the MAS. If not, then TSTP will ship itself to the CMAS for processing. If MAS processing is supported, then TSTP will lock Topology update processing for the MAS, perform its processing, and then issue an unlock. - Method EYU0XSIN (XSIN), which performs initialization of the Common Services (SRV) component in CMASes and MASes, has been updated to add a new call that can be made during MAS restart (a MAS connected to a CMAS remains active while the CMAS is restarted) to clear data used by SRV for locking requests to ensure that subsequent lock requests by TSTP does not result in the use of outdated information. - Method EYU0TICT (TICT), which processes the data provided by TSTP in the CMAS, has been updated to lock Topology updates for the MAS before processing TSTP's data. TICT will issue an unlock when processing is complete. - Method EYU0TIML (TIML), which builds the Topology anchor control block (TIAB) during CMAS initialization, has been updated to place Topology datacache ID in the TIAB. - Method EYU0TSLM (TSLM), which runs in a MAS and retrieves the TIAB of the CMAS to which the MAS is connected, has been updated to place the Topology datacache ID into the MAS's Topology MOEB. This will allow TSTP to allocate storage in the Topology dataspace(s) when it runs locally in the MAS. - Method EYU0TISC (TISC), which builds a CICS System descriptor block (CSDB) for each CSYSDEF, has been updated to turn on a new flag in the CSDB. When TSTP is called in a MAS it will check this flag to determine if it can process locally. - Method EYU0TSSC (TSSC), which runs in a CMAS when a MAS connects to the CMAS, has been updated to register a lock in the CSDB for the MAS. This is the lock used by TICT and TSTP to serialize processing of the Topology update processing for the MAS. - Method EYU0TSSC (TSSC), which runs in a CMAS when a MAS disconnects from the CMAS, has been updated to unregister the lock in the CSDB for the MAS. - Method EYU0TSSD (TSSD), which runs in a CMAS when a CSYSDEF is removed from a CICSplex, has been updated to ensure that the lock located in the CSDB it is about to free has been unregistered.
Temporary fix
********* * HIPER * ********* FIX AVAILABLE BY PTF ONLY
Comments
Elongated MAS CONNECT processing may occur in a heavily loaded CPSM environment. This is more likely to occur when a CMAS is started while a large number of MASes that will connect to the CMAS are already active. In some situations, this may result in MAS communications buffer shortages, which will be indicated by message EYUCL0122E. The standard method that a MAS uses to ship data to the CMAS to which it is connected is: 1. Acquire a source MAL transmission buffer (SMTB) from a pool of pre-allocated buffers. 2. Place the data in the buffer. This consists of the data and the parameter list (MAL - method argument list) of the method that will run in the CMAS and process the data. 3. Chain the buffer to the CMAS's MAS receive link task. This is method EYU0CLER (CLER) running under transaction LEER in the CMAS. 4. Issue a cross memory POST for the LEER task to inform it that it has work to process. 5. The LEER task retrieves the buffer from its queue and calls the method whose MAL is in the buffer. For the most part this method is sufficient to handle all traffic from MASes to the CMAS. However, since all MASes connected to the CMAS use the same pool of SMTBs (2048 elements) and since all SMTBs are processed by the same task in the CMAS (LEER), if a large number of buffers need to be processed concurrently, the LEER task may get backed up, resulting in slow processing and possible SMTB shortages (EYUCL0122E). This is especially true during MAS connect processing, when many MAS generated messages are shipped to the CMAS (MAL XMLM) for inclusion in the EYULOG and many CICS resource updates are sent to the CMAS (MAL TSTP) so that the Topology resource maps can be updated. To alleviate possible transmission congestion, the processing of XMLM and TSTP requests have been modified to not use the normal SMTB process. XMLM requests will now be shipped to the CMAS by writing the message to a CPSM queue structure. A new long running task in the CMAS will check for messages written to the queue, and when they arrive, will call method EYU0XMLM (XMLM) to process them. Additionally, CMAS generated messages will also use this process to send messages to the EYULOG. The following updates were made to affect this change: - New method EYU0XMLT (XMLT) has been created to run as a long running task under transaction XMLT in the CMAS to process all writing to the EYULOG in the CMAS. During initialization, it will allocate a wait queue to receive messages destined for the EYULOG, place the queue ID into the MSG component Major Object Environment Block (MOEB), and then go into a wait. When XMLT is posted because of a message being written to the wait queue, it will retrieve the message from the queue and then call method EYU0XMLT (XMLT) to write the message to the EYULOG. When XMLT is posted for termination, it will mark the queue unavailable, and then process any remaining messages already in the queue before terminating. XMLT will issue new message EYUXM0100I to the EYULOG at startup, and new message EYUXM0101I to the EYULOG at normal termination. If the EYULOG is not available during CMAS initialization, XMLT will issue new message EYUXM0110W to the joblog, console, and EYULOG. If this occurs, no messages will be written to the EYULOG. If an error causes XMLT to terminate abnormally, it will issue new message EYUXM0120E to the joblog, console, and EYULOG. If this occurs, the original methods of writing to the EYULOG will be used. The text of the new messages is as follows: EYUXM0100I Consolidated message log long running task started EYUXM0101I Consolidated message log long running task terminated EYUXM0110W Consolidated message log not available EYUXM0120E Consolidated message log long running task terminated abnormally - The CMAS CSD group EYU310G0, which is contained in EYU964G0, has been updated to include a definition for the new XMLT transaction. - Method EYU0XMIN (XMIN), which initializes the MSG component, has been updated to include a new function call (SETQUE) for a MAS environment to retrieve XMLT's wait queue ID and store it in the MSG MOEB. If the queue ID is not available, XMIN will issue new message EYUXM0020W to the joblog, console, and EYULOG. If this occurs, the MAS will deliver messages to the CMAS by shipping XMLM requests through SMTBs. The text of the new message is as follows: EYUXM0020W Consolidated message log queue not allocated - Method EYU0XLBV (XLBV), which is called in a CMAS and MAS to call the initialization routines for CPSM components, has been updated: - to start XMLT during CMAS initialization. - to call XMIN for the new SETQUE function during MAS initialization after the QUE component has completed initialization, to retrieve the wait queue ID and store it in the MAS's MSG MOEB. - Method EYU0XMSM (XMSM), which is called to issue messages in both a CMAS and MAS environment, has been updated to check if the XMLT wait queue is available. If it is, XMSM will write the EYULOG message to the queue. If the queue is not available or an error occurs writing to the queue: - if XMSM is running in a CMAS it will call XMLM directly. - if XMSM is running in a MAS it will ship the XMLM request to the CMAS through an SMTB. - Method EYU0XMLM (XMLM), which writes messages to the CMAS EYULOG, has been updated to detect if it has been called from XMLT, and if so to process accordingly. - Method EYU0XMTM (XMTM), which is called by method EYU0XLES (XLES) during CMAS and MAS termination to terminate the MSG component, has been updated to add two new functions: - function CLRQUE, which is called only in a MAS, clears the XMLT queue ID from the MSG MOEB. - function TRMXMLT, which is called only in a CMAS, will POST XMLT's termination ECB. - Method EYU0XLES (XLES), which is called during CMAS and MAS termination to call the termination routines for CPSM components, has been updated to call XMTM for the CLRQUE function in a MAS and for the TRMXMLT function in a CMAS. - Method EYU0CLEV (CLEV), which runs as a long running task in a MAS under transaction COI0 to receive requests from the CMAS, has been updated to call XMTM for the CLRQUE function when it is posted for CMAS termination. TSTP requests will now execute directly in the MAS. The following updates were made to affect this change: - Methods EYU0NLXD (NLXD) and EYU0NMMC (NMMC), which run in a MAS and send TSTP requests to the CMAS through SMTBs, have been updated to call TSTP directly. - Method EYU0TSTP (TSTP) has been updated to check if it is executing in a MAS and if so, to check if the CMAS supports TSTP execution in the MAS. If not, then TSTP will ship itself to the CMAS for processing. If MAS processing is supported, then TSTP will lock Topology update processing for the MAS, perform its processing, and then issue an unlock. - Method EYU0XSIN (XSIN), which performs initialization of the Common Services (SRV) component in CMASes and MASes, has been updated to add a new call that can be made during MAS restart (a MAS connected to a CMAS remains active while the CMAS is restarted) to clear data used by SRV for locking requests to ensure that subsequent lock requests by TSTP does not result in the use of outdated information. - Method EYU0TICT (TICT), which processes the data provided by TSTP in the CMAS, has been updated to lock Topology updates for the MAS before processing TSTP's data. TICT will issue an unlock when processing is complete. - Method EYU0TIML (TIML), which builds the Topology anchor control block (TIAB) during CMAS initialization, has been updated to place Topology datacache ID in the TIAB. - Method EYU0TSLM (TSLM), which runs in a MAS and retrieves the TIAB of the CMAS to which the MAS is connected, has been updated to place the Topology datacache ID into the MAS's Topology MOEB. This will allow TSTP to allocate storage in the Topology dataspace(s) when it runs locally in the MAS. - Method EYU0TISC (TISC), which builds a CICS System descriptor block (CSDB) for each CSYSDEF, has been updated to turn on a new flag in the CSDB. When TSTP is called in a MAS it will check this flag to determine if it can process locally. - Method EYU0TSSC (TSSC), which runs in a CMAS when a MAS connects to the CMAS, has been updated to register a lock in the CSDB for the MAS. This is the lock used by TICT and TSTP to serialize processing of the Topology update processing for the MAS. - Method EYU0TSSC (TSSC), which runs in a CMAS when a MAS disconnects from the CMAS, has been updated to unregister the lock in the CSDB for the MAS. - Method EYU0TSSD (TSSD), which runs in a CMAS when a CSYSDEF is removed from a CICSplex, has been updated to ensure that the lock located in the CSDB it is about to free has been unregistered. ž**** PE07/03/22 FIX IN ERROR. SEE APAR PK41853 FOR DESCRIPTION ž**** PE07/08/30 FIX IN ERROR. SEE APAR PK52008 FOR DESCRIPTION
APAR Information
APAR number
PK25020
Reported component name
CPSM CICS 3.1
Reported component ID
5655M1501
Reported release
100
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt
Submitted date
2006-05-17
Closed date
2006-11-17
Last modified date
2007-09-12
APAR is sysrouted FROM one or more of the following:
PK24811
APAR is sysrouted TO one or more of the following:
UK19799
Modules/Macros
EYU#TSTP EYU#XMIN EYU#XMLM EYU#XMLT EYU#XMTM EYU#XSIN EYUNTSTP EYUNXMIN EYUNXMLM EYUNXMLT EYUNXMTM EYUNXSIN EYUQTSTP EYUQXMIN EYUQXMLM EYUQXMLT EYUQXMTM EYUQXSIN EYURTIAB EYURTISD EYURTSTP EYURXMIN EYURXMLM EYURXMLT EYURXMMO EYURXMTM EYURXSIN EYUTRDIR EYUTRMSG EYUTRSRV EYUTRTOP EYUTXMM0 EYUUNAEQ EYUUXMEQ EYUUXXFI EYUYTSTP EYUYXMIN EYUYXMLM EYUYXMLT EYUYXMTM EYUYXSIN EYUZTSTP EYUZXMIN EYUZXMLM EYUZXMLT EYUZXMTM EYUZXSIN EYU0CLEV EYU0NLXD EYU0NMMC EYU0TICT EYU0TIML EYU0TISC EYU0TSLM EYU0TSSC EYU0TSSD EYU0TSSE EYU0TSTP EYU0XLBV EYU0XLES EYU0XMIN EYU0XMLM EYU0XMLT EYU0XMSM EYU0XMTM EYU0XSIN EYU9TSPU EYU9TSP3 EYU9TSP4 EYU9TSP5 EYU9TSP6 EYU9XMPU EYU9XMP3 EYU9XMP4 EYU9XMP5 EYU9XMP6 EYU9XSPU EYU9XSP3 EYU9XSP4 EYU9XSP5 EYU9XSP6 EYU964G0 HCP3100J
| SC34645403 | GC34647103 |
Fix information
Fixed component name
CPSM CICS 3.1
Fixed component ID
5655M1501
Applicable component levels
R100 PSY UK19799
UP06/11/21 P F611
Fix is available
Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.
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Document Information
Modified date:
22 February 2023