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Syncsort Step taking more time ..want to tune
IBM Mainframe Forums -> JCL & VSAM
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thesumitk

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Joined: 24 May 2013
Posts: 156
Location: INDIA
PostPosted: Tue Jul 23, 2013 12:50 pm
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Hi All,

Need your help in below scenario !!

I have a job runing daily in the system .. job is taking 10 mins at below sort step

Code:
PS010  EXEC  PGM=SORT                                             
//SORTLIB  DD  DSN=SORTLIB,DISP=SHR                             
//SYSPRINT DD  SYSOUT=*                                             
//SYSOUT   DD  SYSOUT=*                                             
//SORTIN   DD  DISP=SHR,DSN=&MODE..&SRCCUR.&GDG0
//         DD  DISP=SHR,DSN=&MODE..&SRCCUR1.&GDG0
//         DD  DISP=SHR,DSN=&MODE..&SRCCUR2.&GDG0
//         DD  DISP=SHR,DSN=&MODE..&SRCCUR3.&GDG0
//SORTOUT  DD  DSN=&MODE..SBO01T00.SRCCUR.&JOBNOD,     
//             DISP=(NEW,CATLG,DELETE),                 
//             UNIT=&UNIT1,                             
//             SPACE=&SPACE,                           
//             DCB=(MODEL,RECFM=FB,LRECL=1600,BLKSIZE=0)
//SORTWK01 DD  UNIT=&UNIT1,SPACE=(CYL,(1000,1000),RLSE)
//SORTWK02 DD  UNIT=&UNIT1,SPACE=(CYL,(1000,1000),RLSE)
//SORTWK03 DD  UNIT=&UNIT1,SPACE=(CYL,(1000,1000),RLSE)
//SORTWK04 DD  UNIT=&UNIT1,SPACE=(CYL,(1000,1000),RLSE)
//SORTWK05 DD  UNIT=&UNIT1,SPACE=(CYL,(1000,1000),RLSE)
//SORTWK06 DD  UNIT=&UNIT1,SPACE=(CYL,(1000,1000),RLSE)
//SORTWK07 DD  UNIT=&UNIT1,SPACE=(CYL,(1000,1000),RLSE) 
//SORTWK08 DD  UNIT=&UNIT1,SPACE=(CYL,(1000,1000),RLSE) 
//SORTWK09 DD  UNIT=&UNIT1,SPACE=(CYL,(1000,1000),RLSE) 
//SORTWK10 DD  UNIT=&UNIT1,SPACE=(CYL,(1000,1000),RLSE) 
//SYSIN    DD  *

SORT FIELDS=(8,20,CH,A,313,8,CH,A,387,6,PD,A)
//*



Input records are almost 35000000 each day .. I was wondering if can tune this step by anyway..

Please provide your inputs on this .. Many thanks in advance !!!
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prino

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Joined: 07 Feb 2009
Posts: 1306
Location: Vilnius, Lithuania
PostPosted: Tue Jul 23, 2013 1:36 pm
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Sort all input files when they are created and do a merge in this procedure.
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Arun Raj

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Joined: 17 Oct 2006
Posts: 2481
Location: @my desk
PostPosted: Tue Jul 23, 2013 2:15 pm
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Quote:
job is taking 10 mins at below sort step
Is this the elapsed time? If so, what about the CPU mins?
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Nic Clouston

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Joined: 10 May 2007
Posts: 2455
Location: Hampshire, UK
PostPosted: Tue Jul 23, 2013 2:43 pm
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Why are yuou specifying a MODEL DCB when you are not creating a GDG? Why are you specify DCB at all? Why are you specifying SORTWK?
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thesumitk

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Joined: 24 May 2013
Posts: 156
Location: INDIA
PostPosted: Tue Jul 23, 2013 3:11 pm
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Elapsed time is -11.09
CPU mins are -1.455

SORT work files are added when the job was created I am not sure if they are the reason of long run.. PLease sugegst

we are using DCB because creating a new output file with diffrent rules than input file.

Thanks
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Nic Clouston

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Joined: 10 May 2007
Posts: 2455
Location: Hampshire, UK
PostPosted: Tue Jul 23, 2013 7:02 pm
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Sort will create the file with the correct DCB information for you. As to the sort work files - try running with dynamc allocation and compare the results. There may be no difference but sort will allocated only what it needs. It would also help if you give sort the estimated number of records to be processed.
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Robert Sample

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Joined: 06 Jun 2008
Posts: 8696
Location: Dubuque, Iowa, USA
PostPosted: Tue Jul 23, 2013 7:13 pm
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10 minutes elapsed time to sort 35 million 1600-byte records does not sound too bad. You will find as you progress in your career that you cannot do much tuning on sort -- whether you are using DFSORT or SyncSort or another sort package, they are typically pretty much tuned by the vendor. Some changes, such as dynamic allocation instead of coding SORTWK files, may help somewhat but you're not going to make a few changes and cut 90% of the elapsed time out of the sort.
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dick scherrer

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Joined: 23 Nov 2006
Posts: 19244
Location: Inside the Matrix
PostPosted: Tue Jul 23, 2013 9:16 pm
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Hello,

Why does someone believe that 10 minutes elapsed time is "too much"?
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Anuj Dhawan

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Joined: 22 Apr 2006
Posts: 6250
Location: Mumbai, India
PostPosted: Tue Jul 23, 2013 9:59 pm
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dick scherrer wrote:
Why does someone believe that 10 minutes elapsed time is "too much"?
Ditto, specially when the number of records involved in are 35M+...
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thesumitk

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Joined: 24 May 2013
Posts: 156
Location: INDIA
PostPosted: Wed Jul 24, 2013 2:14 pm
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Ok..Thanks all for your inputs !!..
I will leave this job as is then and move forward to see some other opportunity for batch run tyime reduction.. Thanks
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Arun Raj

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Joined: 17 Oct 2006
Posts: 2481
Location: @my desk
PostPosted: Wed Jul 24, 2013 2:16 pm
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Quote:
move forward to see some other opportunity for batch run tyime reduction
Yes, the ones which are running for hours icon_smile.gif
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thesumitk

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Joined: 24 May 2013
Posts: 156
Location: INDIA
PostPosted: Wed Jul 24, 2013 2:20 pm
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icon_smile.gif icon_smile.gif
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