








	*SMF Tools*

SMF Type 120 Record - Subtype 8

This table shows the record layout for type 120 SMF records
(WebSphere Appl - WebContainer Interval Record - Version 2).

List of other SMF record layouts available.
List of sample SMF reports.

Purpose: WebSphere Application Server writes record type 120 to collect WebSphere Application Server performance statistics.

Record type 120 has the following subtypes:

Subtype 1 - the Server Activity record
Subtype 6 - the Server Interval record
Subtype 5 - the J2EE Container Activity Record
Subtype 6 - the J2EE Container Interval Record
Subtype 7 - the WebContainer Activity record
Subtype 8 - the WebContainer Interval record

Subype 8 - WebContainer Interval Record (Version 2)

The purpose of the WebContainer interval SMF record is to record activity within a WebContainer running inside a WebSphere® Application Server for z/OS® transaction server.

The Web Container acts as a Web Server handling HttpSessions and Servlets. The EJB container is not aware of the purpose of the WebContainer activity record and only records that the EJB has been dispatched, but does not gather any of the detailed information, such as HttpSessions, Servlets, and their respective performance data. A single WebContainer record is created for each Web container.

In addition to data that is associated with an individual activity, there are some cases of Web container work that are performed outside the scope of an individual request. For example, some instances of http session finalization and http session invalidation are performed asynchronously. In such a case a WebContainer interval record would record this data

WebContainer SMF recording is activated and deactivated along with the activation and deactivation of SMF recording for the J2EE container.

The WebContainer Interval record contains:

WebContainer inverval section (one section per record):
Contains information about each activity that occurred within one Web Container in the specified interval.
HttpSessionManager activity section (one section per record):
Contains information about all sessions involved in this activity in the specified interval.
WebApplication activity section (multiple (0..n) sections per record):
Contains information about all WebApplications involved in this activity in the specified interval.
- Servlet activity section (multiple (0..n) sections per WebApplication section):
  Contains information about all Servlets involved in this activity in the specified interval.

It's easy to report on SMF 120 data! (Jump to sample reports)

We have a low-cost 4GL report writer especially for SMF files. It's called Spectrum SMF Writer.

Spectrum SMF Writer handles the difficult SMF record parsing for you automatically. You just specify which fields you want to see.

Spectrum SMF Writer also converts the arcane date and time fields and reformats them into an attractive report.

Plus, Spectrum SMF Writer can export SMF data as comma delimited files to use on your PC.

SMF Type 120 Record -- WebSphere Appl - WebContainer Interval Record - Version 2
Offset (Dec.)	Offset (Hex)	Name	Length	Format	Description
0	0	SMF120LEN	2	binary	Record length. This field and the next field (total of four bytes) form the RDW (record descriptor word).
2	2	SMF120SEG	2	binary	Segment descriptor (see record length field)
4	4	SMF120FLG	1	binary	Bit meaning when set 0: New SMF record format 1: Subtypes used 2: Reserved 3-6: Version indicators* 7: Reserved
5	5	SMF120RTY	1	binary	Record type 120(X'78')
6	6	SMF120TME	4	binary	Time since midnight, in hundredths of a second, that the record was moved into the SMF buffer.
10	A	SMF120DTE	4	packed	Date when the record was moved into the SMF buffer, in the form 0 cyydddF.
14	E	SMF120SID	4	EBCDIC	System identification (from the SMFPRMxx SID parameter)
18	12	SMF120SSI	4	EBCDIC	Subsystem identification from SUBSYS parameter
22	16	SMF120RST	2	binary	Record subtype: 1: Server activity 2: Container activity 3: Server interval 4: Container interval. 5: J2EE container activity 6: J2EE container interval 7: WebContainer activity 8: WebContainer interval
24	18	SMF120TRN	4	binary	Number of triplets in this record. A triplet is a set of three SMF fields (offset/length/number values) that defines a section of the record. The offset is the offset from the RDW. Subtypes: 1: Value is equal to the number of sessions +2 2 and 4: Value is equal to the number of classes +2.
28	1C	SMF120PRS	4	binary	Offset to product section from RDW.
32	20	SMF120PRL	4	binary	Length of product section.
36	24	SMF120PRN	4	binary	Number of product sections.
Individual header extension for subtype 8
40	28	SMF120WI1	4	binary	Offset to WebContainer interval section from RDW.
44	2C	SMF120WI2	4	binary	Length of WebContainer interval section.
48	30	SMF120WI3	4	binary	Number of WebContainer interval sections.
52	34	SMF120WI4	4	binary	Offset to HttpSessionManager interval section from RDW.
56	38	SMF120WI5	4	binary	Length of HttpSessionManager interval section.
60	3C	SMF120WI6	4	binary	Number of HttpSessionManager interval sections.
The following triplet appears once for each WebApplication section.
64	40	SMF120WI7	4	binary	Offset to WebApplication section from RDW.
68	44	SMF120WI8	4	binary	Length of WebApplication section.
72	48	SMF120WI9	4	binary	Number of WebApplication sections.
Product Section(Offset from beginning of record: SMF120PRS)
0	0	SMF120MFV	4	binary	CB SMF version
4	4	SMF120COD	8	EBCDIC	Character codeset in which strings in the SMF record are encoded
12	C	SMF120END	4	binary	Encode of numbers in the SMF record
16	10	SMF120TSF	4	binary	Encoding of timestamps: 1: S390STCK64: The time values are encoded in 64-bit S/390 Store Clock format.
Reassembly information.
20	14	SMF120IXR	4	binary	Index of this record
24	18	SMF120NRC	4	binary	Total number of records
28	1C	SMF120NTR	4	binary	Total number of triplets
Subtype 8 - WebContainer Activity Section There is one section per record. The WebContainer activity section contains information about each activity that occurred within one web container. (Offset from beginning of record: SMF120WI1)
0	0	SMF120WIA	64	EBCDIC	The WebSphere transaction server host name.
64	40	SMF120WIB	8	EBCDIC	The WebSphere transaction server name.
72	48	SMF120WIC	8	EBCDIC	The WebSphere transaction server instance name.
80	50	SMF120WID	16	S390STCK	The time the sample began.
96	60	SMF120WIE	16	S390STCK	The time the sample ended.
112	70	SMF120CL5	8	EBCDIC	Cell
120	78	SMF120ND5	8	EBCDIC	Node
HttpSessionManager Section There is one section per record. The HttpSessionManager section contains information about all (there may be zero or one) http sessions associated to one single activity. (Offset from beginning of record: SMF120WI4)
0	0	SMF120WIF	4	binary	'createdSessions': Number of http sessions that were created.
4	4	SMF120WIG	4	binary	'invalidatedSessions': Number of http sessions that were invalidated.
8	8	SMF120WIH	4	binary	'activeSessions': Current® number of http sessions that are actively referenced in the server at the end of the interval.
12	C	SMF120WII	4	binary	'minActiveSessions': Minimum number of active http sessions during the interval..
16	10	SMF120WIJ	4	binary	'maxActiveSessions': Maximum number of active http sessions during the interval.
20	14	SMF120WIK	4	binary	'sessionLifeTime': Average lifetime (in milliseconds) of invalidated http sessions.
24	18	SMF120WIL	4	binary	'sessionInvalidateTime': Average time (in milliseconds) that was required to process the invalidation of http sessions.
28	1C	SMF120WIM	4	binary	'finalizedSessions': Number of sessions that were finalized.
32	20	SMF120WIN	4	binary	'liveSessions': Total number of http sessions being tracked by the server at the end of the interval. This includes both active and inactive sessions.
36	24	SMF120WIO	4	binary	'minLiveSessions': Minimum number of live http sessions during the interval.
40	28	SMF120WIP	4	binary	'maxLiveSessions': Maximum number of live http sessions during the interval.
WebApplication Section There are multiple (0-n) sections per record. The WebApplication section contains information about all WebApplications involved in this activity. (Offset from beginning of record: SMF120WI7)
0	0	SMF120WIQ	256	Unicode	The WebApplication name.
256	100	SMF120WIR	4	binary	'numLoadedServlets': Number of servlets that were loaded.
260	104	SMF120WIS	4	binary	Number of servlet triplets in this web application section. Note: This value might differ from the number of servlet sections in this record since servlets might exist that have been inactive during the interval.
Servlet Triplets The following triplet appears 0-n times, once for each servlet section (Offset from beginning of record: SMF120WI7 + 264)
0	0	SMF120WIT	4	binary	Offset to servlet section from the beginning of this WebApplication section.
4	4	SMF120WIU	4	binary	Length of the servlet section.
8	8	SMF120WIV	4	binary	Number of servlet section.
Servlet Activity Section There are multiple (0-n) sections per WebApplication section. The Servlet activity section contains information about each servlet associated with WebApplications involved in this activity. (Offset from beginning of record: SMF120WI7 + SMF120WIT)
0	0	SMF120WIW	256	Unicode	The servlet name.
256	100	SMF120WIX	4	binary	'totalRequests': Number of times the servlet service was requested during the interval.
260	104	SMF120WIY	4	binary	'responseTime': Average response time in milliseconds.
264	108	SMF120WIZ	4	binary	'minResponseTime': Minimum response time in milliseconds.
268	10C	SMF120WJ1	4	binary	'maxResponseTime': Maximum response time in milliseconds.
272	110	SMF120WJ2	4	binary	'numErrors': The number of errors that were encountered during servlet execution.
276	114	SMF120WJ3	16	EBCDIC	'loadedSince': Timestamp when the servlet was loaded. Example: Fri May 25 08:42:25 EDT 2001
292	124	SMF120WJ4	8	binary	Average cpu time in microseconds.
300	12C	SMF120WJ5	8	binary	Minimum cpu time in microseconds.
308	134	SMF120WJ6	8	binary	Maximum cpu time in microseconds.

The table above is based on the description provided by IBM in its "MVS Systems Management Facilities (SMF)" manual.

Spectrum SMF Writer - the 4GL SMF Report Writer.

Sample Report from SMF 120
WebSphere Application Java CPU Times

The sample SMF report below was created with Spectrum SMF Writer, the low-cost 4GL SMF report writer. It reads as input the SMF file and selects just the type 120 WebSphere Application records for Jave 2 Enterprise Edition containers. (See SMF 120-5 record layout.) It then prints a report line for each Java bean method accounting section found. The report shows CPU time information about those Java bean methods. Note that a single SMF 120 record can contain information about multiple beans and multiple methods per bean.

All of this with just a few of code!
Why not install a Spectrum SMF Writer trial right now and start making your own SMF reports!

These Spectrum SMF Writer Statements:


INPUT:  SMF12005

INCLUDEIF: SMF120RTY=120   AND SMF120RST=5

TITLE: 'Z/OS WEBSPHERE APPLICATION SMF 120 DATA'
TITLE: 'SUBTYPE 5 -- J2EE CONTAINER ACTIVITY'

COL: SMF120RST(3 'SUB/TYP')
     SMF120JA4(5 'TRANS/SERVER/HOST')
     SMF120JA5(6 'TRANS/SERVER/NAME')
     SMF120JA8_EBC(8 'CONTAINER/NAME')
     SMF120CL2('CELL')
     SMF120ND2('NODE')
     SMF120JB1_EBC(10 'BEAN/NAME')
     SMF120JM1_EBC(25 'BEAN/METHOD')
     SMF120JM2(5 'TIMES/INVOK')
     SMF120JM3('AVG/RSP/TIME' TPIC'9.999' )
     SMF120JM4('MAX/RSP/TIME' TPIC'9.999'  )
     SMF120JMQ('AVG/CPU/TIME' TPIC'9.999999' )
     SMF120JMR('MIN/CPU/TIME' TPIC'9.999999')
     SMF120JMS('MAX/CPU/TIME' TPIC'9.999999')

Produce This SMF Report:


                                            Z/OS WEBSPHERE APPLICATION SMF 120 DATA
                                             SUBTYPE 5 -- J2EE CONTAINER ACTIVITY

     TRANS TRANS                                                                         AVG   MAX    AVG      MIN      MAX
 SUB SERVE SERVER CONTAINE                      BEAN              BEAN            TIMES  RSP   RSP    CPU      CPU      CPU
 TYP HOST   NAME    NAME     CELL     NODE      NAME             METHOD           INVOK TIME  TIME    TIME     TIME     TIME
 ___ _____ ______ ________ ________ ________ __________ _________________________ _____ _____ _____ ________ ________ ________

   5 AWT4  AXZ4S1 Default  AXZ4     AXZ44    Tonam::Inf invoke:java.lang.String,j     1 0.014 0.014 0.013665 0.013665 0.013665
   5 AWT4  AXZ4S1 Default  AXZ4     AXZ44    Tonam::Inf invoke:java.lang.String,j     1 0.020 0.020 0.006287 0.006287 0.006287
   5 AWT4  AXZ4S1 Default  AXZ4     AXZ44    Tonam::Inf login:java.lang.String,ja     1 0.006 0.006 0.004206 0.004206 0.004206
   5 AWT4  AXZ4S1 Default  AXZ4     AXZ44    Tonam::Inf invoke:java.lang.String,j     1 0.004 0.004 0.003605 0.003605 0.003605
   5 AWT4  AXZ4S1 Default  AXZ4     AXZ44    Tonam::Inf invoke:java.lang.String,j     1 0.007 0.007 0.004831 0.004831 0.004831
   5 AWT4  AXZ4S1 Default  AXZ4     AXZ44    Tonam::Inf invoke:java.lang.String,j     2 0.005 0.010 0.005650 0.001264 0.010036

 *** GRAND TOTAL (     6 ITEMS)

See other sample SMF reports.