BUFNO y BUFSIZE

juanvg1972 — Wed, 22 Jul 2015 23:28:11 GMT

Hi,

I would like to know how to modify BUFNO and BUFSIZE to improve the performance of my process.

I know that option is related with size and number of buffers, but I don'y know which is the optimial value.

My process is the typical ETL process, I read from external files, I made filerts, join, aggrs and load to database. My main datasets is about 10 millions rows.

Thanks in advance

Re: BUFNO y BUFSIZE

ChrisNZ — Thu, 23 Jul 2015 01:04:26 GMT

There is no such thing as "optimal" once and for all. If performance matters to you, you have to test.

Here is a small excerpt from my book High-Performance SAS Coding

http://www.amazon.com/High-Performance-SAS-Coding-Christian-Graffeuille/dp/1514362317

fyi and to use as your testing framework.

Data Set Buffer Case Studies

Each case is different and ideally tests should be conducted in order to decide upon the values of BUFSIZE and BUFNO as well as to decide when to use direct I/O. These decisions will depend on the hardware, the data, how the data is used, and what other jobs are running. [..]

The first row uses the default SAS settings. The best times are underlined¸ and the grey zones are where enabling SGIO slowed down the data transfer compared to just using the default.

May the "search for better performance" bug be with you forever!

topic BUFNO y BUFSIZE in SAS Programming

BUFNO y BUFSIZE

Re: BUFNO y BUFSIZE

Data Set Buffer Case Studies