DEFLATE compression

If you use DEFLATE compression in HULFT, you need to specify environment variables in the CEEOPTS statement and adjust the threshold to use zEDC.

To adjust the threshold, use "_HZC_DEFLATE_THRESHOLD" (compression) and "_HZC_INFLATE_THRESHOLD" (expand) of the environment variables.

If you specify "1" to the environment variable, use of zEDC is forced for all DEFLATE requests with a default input size of one or more bytes.

For details, refer to the z/OS manual.

Startup JCL for the Send program

The example of startup JCL for the Send program is shown below.

[Example of JCL]

//HULSND JOB CLASS=A,MSGCLASS=B,TIME=1440                                       
//HULSND EXEC PGM=XRSND,REGION=4096K                                            
//* PARM='MODE=WARM'                                                            
//STEPLIB  DD   DSN=HULFT.LOAD,DISP=SHR                                         
//XRFILE   DD   DSN=HULFT.FILE,DISP=SHR                                         
//XRHOST   DD   DSN=HULFT.HOST,DISP=SHR                                         
//XRQUE    DD   DSN=HULFT.QUEUE,DISP=SHR                                        
//XRLOG    DD   DSN=HULFT.LOG,DISP=SHR                                          
//XRLOG1   DD   DSN=HULFT.LOG.PATH1,DISP=SHR                                    
//XRLOG2   DD   DSN=HULFT.LOG.PATH2,DISP=SHR                                    
//XRSYSIN  DD   DSN=HULFT.PARMLIB(HULPRM),DISP=SHR                              
//IPGET    DD   DSN=HULFT.HOSTS.LOCAL,DISP=SHR                                  
//*SYSTCPD DD   DSN=TCPIP.V3R4.TCPIP.DATA,DISP=SHR                              
//CEEOPTS  DD   DSN=HULFT.CEEOPTS.SND,DISP=SHR     (*1)                         
//SYSUDUMP DD SYSOUT=*                                                          
//

DD Name	Value	Description
STEPLIB	HULFT.LOAD	HULFT load module library
XRFILE	HULFT.FILE	Send and Receive Management File
XRHOST	HULFT.HOST	Host Information File
XRQUE	HULFT.QUEUE	Send Control File
XRLOG	HULFT.LOG	Send and Receive Log File ID Key File
XRLOG1	HULFT.LOG.PATH1	Send and Receive Log Host Name Key File
XRLOG2	HULFT.LOG.PATH2	Send and Receive Log Date Key File
XRSYSIN	HULFT.PARMLIB(HULPRM)	System Environment Settings File
IPGET	HULFT.HOSTS.LOCAL	IP Management File
CEEOPTS	HULFT.CEEOPTS.SND	(*1)

Set the environment variable

The attributes of the file that you create are shown below.

Attribute
Organization	Record Format	Record Length	Block Size
PS	FB	80	Any

[Example of HULFT.CEEOPTS.SND]

ENVAR("_HZC_DEFLATE_THRESHOLD=1")

Parameter Name	Value	Description
_HZC_DEFLATE_THRESHOLD=1	ENVAR	Threshold value for zEDC usage

Startup JCL for the Receive program

The example of startup JCL for the Receive program is shown below.

[Example of JCL]

//HULRCV JOB CLASS=A,MSGCLASS=B,TIME=1440                                       
//HULRCV EXEC PGM=XRRCV,REGION=4096K                                            
//* PARM=('MAX-CON=16,APPLNM=HULRCV,RCVRETRY=0,RCVRTIME=0,',                    
//* 'JOBWTIME=15,TCPIP=TCPIP')                                                  
//STEPLIB  DD   DSN=HULFT.LOAD,DISP=SHR                                         
//XRFILE   DD   DSN=HULFT.FILE,DISP=SHR                                         
//XRHOST   DD   DSN=HULFT.HOST,DISP=SHR                                         
//XRLOG    DD   DSN=HULFT.LOG,DISP=SHR                                          
//XRLOG1   DD   DSN=HULFT.LOG.PATH1,DISP=SHR                                    
//XRLOG2   DD   DSN=HULFT.LOG.PATH2,DISP=SHR                                    
//XRSYSIN  DD   DSN=HULFT.PARMLIB(HULPRM),DISP=SHR                              
//PORTGET  DD   DSN=HULFT.PROFILE.TCPIP,DISP=SHR                                
//CEEOPTS  DD   DSN=HULFT.CEEOPTS.RCV,DISP=SHR     (*1)                         
//SYSUDUMP DD   SYSOUT=*                                                        
//

DD Name	Value	Description
STEPLIB	HULFT.LOAD	HULFT load module library
XRFILE	HULFT.FILE	Send and Receive Management File
XRHOST	HULFT.HOST	Host Information File
XRLOG	HULFT.LOG	Send and Receive Log File ID Key File
XRLOG1	HULFT.LOG.PATH1	Send and Receive Log Host Name Key File
XRLOG2	HULFT.LOG.PATH2	Send and Receive Log Date Key File
XRSYSIN	HULFT.PARMLIB(HULPRM)	System Environment Settings File
PORTGET	HULFT.PROFILE.TCPIP	PORT Management File
CEEOPTS	HULFT.CEEOPTS.RCV	(*1)

Set the environment variable

The attributes of the file that you create are shown below.

Attribute
Organization	Record Format	Record Length	Block Size
PS	FB	80	Any

[Example of HULFT.CEEOPTS.RCV]

ENVAR("_HZC_INFLATE_THRESHOLD=1")

Parameter Name	Value	Description
_HZC_INFLATE_THRESHOLD=1	ENVAR	Threshold value for zEDC usage