This method for running Tomcat on iSeries gives room for adequate system performance for production level uses of Tomcat.
First, run Tomcat in its own subsystem.
Create library RJSTOMCAT:
Create Library (CRTLIB)
Type choices, press Enter.
Library . . . . . . . . . . . . RJSTOMCAT Name
Library type . . . . . . . . . . *PROD *PROD, *TEST
Text 'description' . . . . . . . Tomcat Commands
Create a new source file and enter the source for the command and the command
processing program that will start Tomcat in the new subsystem.
Create Source Physical File (CRTSRCPF)
Type choices, press Enter.
File . . . . . . . . . . . . . . SOURCE Name
Library . . . . . . . . . . . RJSTOMCAT Name, *CURLIB
Record length . . . . . . . . . 132 Number
Member, if desired . . . . . . . *NONE Name, *NONE, *FILE
Text 'description' . . . . . . . *BLANK
Then create the two members:
Work with Members Using PDM S10571ZM
File . . . . . . SOURCE
Library . . . . RJSTOMCAT Position to . . . . .
Type options, press Enter.
2=Edit 3=Copy 4=Delete 5=Display 6=Print 7=Rename
8=Display description 9=Save 13=Change text 14=Compile 15=Create module...
Opt Member Type Text
STRRJSCAT CMD Start Apache Tomcat
STRRJSCATC CLP Start Apache Tomcat
Columns . . . : 1 120 Browse
RJSTOMCAT/SOURCE
SEU==>
STRRJSCAT
FMT ** ...+... 1 ...+... 2 ...+... 3 ...+... 4 ...+... 5 ...+... 6 ...+...
7 ...+... 8 ...+... 9 ...+... 0 ...+... 1 ...+... 2
*************** Beginning of data ********************************************
0001.00 CMD PROMPT('Start Apache Tomcat')
0002.00 PARM KWD(TOMCATFLR) TYPE(*CHAR) LEN(255) +
0003.00 DFT('/tomcat5028') PROMPT('Tomcat 5.x path')
****************** End of data ***********************************************
Columns . . . : 1 120 Browse
RJSTOMCAT/SOURCE
SEU==>
STRRJSCATC
FMT ** ...+... 1 ...+... 2 ...+... 3 ...+... 4 ...+... 5 ...+... 6 ...+...
7 ...+... 8 ...+... 9 ...+... 0 ...+... 1 ...+... 2
*************** Beginning of data ********************************************
0001.00 PGM PARM(&TOMCATFLR)
0002.00
0003.00 DCL VAR(&TOMCATFLR) TYPE(*CHAR) LEN(255)
0004.00 DCL VAR(&CMD) TYPE(*CHAR) LEN(1024)
0005.00
0006.00 MONMSG MSGID(CPF0000) EXEC(GOTO CMDLBL(ERRORS))
0007.00
0008.00 /* BUILD TOMCAT STARTUP COMMAND STRING */
0009.00 CHGVAR VAR(&CMD) VALUE(&TOMCATFLR |< +
0010.00 '/bin/catalina400.sh')
0011.00
0012.00 /* SUBMIT TOMCAT STARTUP TO BATCH */
0013.00 SBMJOB CMD(STRQSH CMD(&CMD)) JOB(TOMCATSVR) +
0014.00 JOBQ(RJSTOMCAT) CURLIB(*CRTDFT) INLLIBL(*NONE) +
0015.00 CPYENVVAR(*YES) ALWMLTTHD(*YES)
0016.00
0017.00 SNDPGMMSG MSGID(CPF9898) MSGF(QCPFMSG) MSGDTA('Tomcat +
0018.00 startup job was submitted') MSGTYPE(*COMP)
0019.00 RETURN
0020.00 ERRORS:
0021.00 SNDPGMMSG MSGID(CPF9898) MSGF(QCPFMSG) MSGDTA('Error +
0022.00 submitting Tomcat startup job. Check the +
0023.00 joblog') MSGTYPE(*ESCAPE)
0024.00
0025.00 ENDPGM
****************** End of data ***********************************************
Create a new subsystem description with the CRTSBSD command.
Create Subsystem Description (CRTSBSD)
Type choices, press Enter.
Subsystem description . . . . . > RJSTOMCAT Name
Library . . . . . . . . . . . > RJSTOMCAT Name, *CURLIB
Storage pools:
Pool identifier . . . . . . . > 1 1-10
Storage size . . . . . . . . . > 500000 Number, *BASE, *NOSTG...
Activity level . . . . . . . . > 100 Number
+ for more values
Maximum jobs . . . . . . . . . . *NOMAX 0-1000, *NOMAX
Text 'description' . . . . . . . > 'RJS Tomcat Subsystem'
Additional Parameters
Sign-on display file . . . . . . *QDSIGNON Name, *QDSIGNON
Library . . . . . . . . . . . Name, *LIBL, *CURLIB
Subsystem library . . . . . . . *NONE Name, *NONE
More...
F3=Exit F4=Prompt F5=Refresh F12=Cancel F13=How to use this display
F24=More keys
The important part here is the storage pool of adequate size.
It is easiest to manage this subsystem and Tomcat if the Tomcat start command
starts automatically when the subsystem is started. To do so, create a job
description and reference it in an autostart job entry relative to the subsystem.
Add a job queue to the subsystem so jobs submitted by the STRTOMCAT command can
route into the subsystem.
Create Job Queue (CRTJOBQ)
Type choices, press Enter.
Job queue . . . . . . . . . . . rjstomcat Name
Library . . . . . . . . . . . rjstomcat Name, *CURLIB
Text 'description' . . . . . . . Job queue for tomcat jobs
Bottom
F3=Exit F4=Prompt F5=Refresh F10=Additional parameters F12=Cancel
F13=How to use this display F24=More keys
Add the job queue to the subsystem description.
Add Job Queue Entry (ADDJOBQE)
Type choices, press Enter.
Subsystem description . . . . . rjstomcat Name
Library . . . . . . . . . . . rjstomcat Name, *LIBL, *CURLIB
Job queue . . . . . . . . . . . rjstomcat Name
Library . . . . . . . . . . . rjstomcat Name, *LIBL, *CURLIB
Maximum active jobs . . . . . . *nomax 0-1000, *NOMAX
Sequence number . . . . . . . . 10 1-9999
Max active priority 1 . . . . . *NOMAX 0-99, *NOMAX
Max active priority 2 . . . . . *NOMAX 0-99, *NOMAX
Max active priority 3 . . . . . *NOMAX 0-99, *NOMAX
Max active priority 4 . . . . . *NOMAX 0-99, *NOMAX
Max active priority 5 . . . . . *NOMAX 0-99, *NOMAX
Max active priority 6 . . . . . *NOMAX 0-99, *NOMAX
Max active priority 7 . . . . . *NOMAX 0-99, *NOMAX
Max active priority 8 . . . . . *NOMAX 0-99, *NOMAX
Max active priority 9 . . . . . *NOMAX 0-99, *NOMAX
Bottom
F3=Exit F4=Prompt F5=Refresh F12=Cancel F13=How to use this display
F24=More keys
Add a routing entry.
Add Routing Entry (ADDRTGE)
Type choices, press Enter.
Subsystem description . . . . . RJSTOMCAT Name
Library . . . . . . . . . . . RJSTOMCAT Name, *LIBL, *CURLIB
Routing entry sequence number . 9999 1-9999
Comparison data:
Compare value . . . . . . . . *ANY
Starting position . . . . . . 1-80
Program to call . . . . . . . . QCMD Name, *RTGDTA
Library . . . . . . . . . . . QSYS Name, *LIBL, *CURLIB
Class . . . . . . . . . . . . . QSYSCLS50 Name, *SBSD
Library . . . . . . . . . . . QSYS Name, *LIBL, *CURLIB
Maximum active routing steps . . *NOMAX 0-1000, *NOMAX
Storage pool identifier . . . . 1 1-10
Create the job description.
Create Job Description (CRTJOBD)
Type choices, press Enter.
Job description . . . . . . . . > RJSTOMCAT Name
Library . . . . . . . . . . . > RJSTOMCAT Name, *CURLIB
Job queue . . . . . . . . . . . > RJSJOBQ Name
Library . . . . . . . . . . . > RJSTOMCAT Name, *LIBL, *CURLIB
Job priority (on JOBQ) . . . . . 5 1-9
Output priority (on OUTQ) . . . 5 1-9
Print device . . . . . . . . . . *USRPRF Name, *USRPRF, *SYSVAL...
Output queue . . . . . . . . . . *USRPRF Name, *USRPRF, *DEV, *WRKSTN
Library . . . . . . . . . . . Name, *LIBL, *CURLIB
Text 'description' . . . . . . . > 'Autostart Tomcat'
Additional Parameters
User . . . . . . . . . . . . . . > DKIMMEL Name, *RQD
Print text . . . . . . . . . . . *SYSVAL
Accounting code . . . . . . . . *USRPRF
Routing data . . . . . . . . . . QCMDI
Request data or command . . . . > 'RJSTOMCAT/STRRJSCAT TOMCATFLR(''/tomcat
5028'')'
CL syntax check . . . . . . . . *NOCHK 0-99, *NOCHK
Initial library list . . . . . . *SYSVAL Name, *SYSVAL, *NONE
+ for more values
End severity . . . . . . . . . . 30 0-99
Message logging:
Level . . . . . . . . . . . . 4 0-4
Severity . . . . . . . . . . . 0 0-99
Text . . . . . . . . . . . . . *NOLIST *NOLIST, *MSG, *SECLVL
Log CL program commands . . . . *NO *NO, *YES
Inquiry message reply . . . . . *RQD *RQD, *DFT, *SYSRPYL
Hold on job queue . . . . . . . *NO *NO, *YES
Job date . . . . . . . . . . . . *SYSVAL Date, *SYSVAL
Job switches . . . . . . . . . . 00000000 Character value
Device recovery action . . . . . *SYSVAL
Time slice end pool . . . . . . *SYSVAL *SYSVAL, *NONE, *BASE
Authority . . . . . . . . . . . *LIBCRTAUT Name, *LIBCRTAUT, *CHANGE...
Job message queue maximum size *SYSVAL 2-64, *SYSVAL
Job message queue full action . *SYSVAL *SYSVAL, *NOWRAP, *WRAP...
Allow multiple threads . . . . . *NO *NO, *YES
Bottom
F3=Exit F4=Prompt F5=Refresh F12=Cancel F13=How to use this display
F24=More keys
Add an autostart job entry to the subsystem referencing the job description.
Add Autostart Job Entry (ADDAJE)
Type choices, press Enter.
Subsystem description . . . . . rjstomcat Name
Library . . . . . . . . . . . rjstomcat Name, *LIBL, *CURLIB
Job name . . . . . . . . . . . . rjstomcat Name
Job description . . . . . . . . rjstomcat Name, *SBSD
Library . . . . . . . . . . . rjstomcat Name, *LIBL, *CURLIB
Bottom
F3=Exit F4=Prompt F5=Refresh F12=Cancel F13=How to use this display
F24=More keys
The subsystem is complete for all that is needed to run Tomcat and optimize
it for performance. It may be started with the STRSBS command or added to the
QSTRUP program for the system so that the subsystem and the Tomcat job will
start whenever the iSeries is re-IPL'ed.
The regular ENDTOMCAT command will still end Tomcat as it listens for contol
strings on the same port no matter its subsystem.
The subsystem can now be tuned with the WRKSYSSTS command. Pool 1 of the
RJSTOMCAT subsystem as described above is system pool 5 in this screen print.
Work with System Status S10571ZM
03/04/06 15:14:19
% CPU used . . . . . . . : .5 Auxiliary storage:
% DB capability . . . . : .0 System ASP . . . . . . : 87.74 G
Elapsed time . . . . . . : 00:00:01 % system ASP used . . : 42.1663
Jobs in system . . . . . : 698 Total . . . . . . . . : 87.74 G
% perm addresses . . . . : .007 Current unprotect used : 3597 M
% temp addresses . . . . : .009 Maximum unprotect . . : 4101 M
Type changes (if allowed), press Enter.
System Pool Reserved Max -----DB----- ---Non-DB---
Pool Size (M) Size (M) Active Fault Pages Fault Pages
1 131.87 69.50 +++++ .0 .0 .8 .8
2 380.69 .98 61 .0 .0 .0 .0
3 51.19 2.10 26 .0 .0 4.4 10.5
4 10.23 .00 8 .0 .0 .0 .0
5 450.00 .24 100 .0 .0 .0 .0
Bottom
Command
===>
F3=Exit F4=Prompt F5=Refresh F9=Retrieve F10=Restart
F11=Display transition data F12=Cancel F24=More keys
IBM recommends that the Non-DB Fault pages should stay below about 50. Adjust the pool size such that it stays below 50. When the subsystem starts (and Tomcat starts) the activity and the Non-DB fault rate will be quite high. Wait until it settles before making your final adjustments.
