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vikramdr · Beginner Joined: 15 Feb 2003 Posts: 15 Topics: 11

Hi,
Can some one explain me how SYNC verb in cobol work. Also please explain what will be length of following group variable.

kolusu · Posted: Sat Dec 09, 2006 6:39 pm Post subject:

vikramdr,

Check this link which explains in detail about the SYNC verb

http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/IGY3LR10/5.3.15?DT=20020920180651

Hope this helps...

Cheers

Kolusu
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naveen · Beginner Joined: 03 Dec 2002 Posts: 90 Topics: 31

In layman's language , SYNC aligns storage to word boundaries. Every fetch/read instruction for CPU reads one complete word. If storage of an item is spilled over two words , it will need 2 CPU fetch cycles. With the help of SYNC storage is aligned to word boundaries and hence extra CPU fetch cyles are reduced , resulting in faster access.

At the same time the downside is the waste of space created because of movement of storage towards boundaries , these empty spaces are called slack bytes.