Recommendation for optimal BLKSIZE

This forum provides the support of Dezhi Mainframe systems. Please post your questions about logon, usage of our mainframe environment.

Moderators: sysprog, prino, sfan, steve-myers, Tim001

Recommendation for optimal BLKSIZE

Postby axdmlm » Thu 24 Aug 2017, 18:36

I have a PDSE I use to hold assembly listings.
I allocated it with BLSKIZE=13300.
Shoulld I change it?

Thanks
axdmlm
 
Posts: 7
Joined: Sun 13 Aug 2017, 17:28
Location: Arroyo Grande, California USA

Re: Recommendation for optimal BLKSIZE

Postby steve-myers » Thu 24 Aug 2017, 18:55

Not worth the effort. Remember PDSE maps PDS data records over 4K records.
steve-myers
 
Posts: 462
Joined: Tue 04 May 2010, 15:43

Re: Recommendation for optimal BLKSIZE

Postby axdmlm » Thu 24 Aug 2017, 22:11

Just wanted to be sure.
Thanks.
axdmlm
 
Posts: 7
Joined: Sun 13 Aug 2017, 17:28
Location: Arroyo Grande, California USA

Re: Recommendation for optimal BLKSIZE

Postby steve-myers » Thu 24 Aug 2017, 23:02

On second thought, use SDB. This will allocate BLKSIZE=32718. It won't make any difference in data set size or EXCPs, but it will reduce - a little - your CPU time as there will be fewer interactions between the program and PDSE.

HLASM supports RECFM=VBA or VBM. This will mean a larger BLKSIZE , and the data set will have fewer bytes because of trailing blank elimination, so there will be fewer interactions between your program and PDSE.
steve-myers
 
Posts: 462
Joined: Tue 04 May 2010, 15:43

Re: Recommendation for optimal BLKSIZE

Postby steve-myers » Fri 25 Aug 2017, 17:09

As for your

IEC141I 013-EC,IGG0191A,AXDMLMJ,L,SYSPRINT,0A77,FUSR27,AXDMLM.LINKLIST(PGM1)

I think the Binder wants RECFM=FBA,LRECL=121. It won't do LRECL=133.

See http://publibz.boulder.ibm.com/cgi-bin/ ... 0709091949
steve-myers
 
Posts: 462
Joined: Tue 04 May 2010, 15:43


Return to Dezhi systems: Mainframe

Who is online

Users browsing this forum: No registered users and 1 guest

cron