bug#15578: Parameter -d or --direct to open files with flag O_DIRECT? (original) (raw)

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From: Kyle Sallee
Subject: bug#15578: Parameter -d or --direct to open files with flag O_DIRECT?
Date: Wed, 9 Oct 2013 21:49:21 -0700

Please forgive the inconvenience. Attaching a gzipped patch file ensures the integrity of patch file content. I should have presented only the idea rather than a patch for the implementation.

I concur dd is already suited to the task.

Please consider

| sed 's/^/if=/' | xargs -r --max-lines=1 dd iflag=direct # in contrast with | xargs -r --max-lines=4096 cat -d --

Invoking dd 466059 times costs only a slight performance decrease as compared with invoking cat 114 times. However, this example probably represents rare usage for cat.

Thanks for granting the time and consideration.