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SGIO

Default	0 (Off)
Valid in:	configuration file, SAS invocation
Windows specifics:	Valid only for Windows NT

no argument

activates the scatter-read / gather-write algorithm. Once active, scatter-read / gather-write is active until SAS ends.

Details

The SGIO system option greatly improves input and output performance for SAS data sets when the PC has a large amount of RAM and is using the Windows NT operating system. Scatter-read / gather-write bypasses intermediate buffer transfers between memory and disk.

When SGIO is active, SAS uses the number of buffers specified by the BUFNO system option to transfer data betwen disk and RAM. I/O performance improves as the value for the BUFNO increases.

The scatter-read / gather-write is active only for SAS I/O opened in INPUT or OUTPUT mode. If any SAS I/O files are opened in UPDATE or RANDOM mode, SGIO is inactive for that process.

To use the SGIO system option, Service Pack 4 must be installed.

See Also

• System Option: BUFNO

• SAS System Features that Optimize Performance

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