Subject: Re: NCR Driver Problems To: None <,> From: proprietor -
Foo Bar And Grill <> List: current-users Date: 01/31/1996
10:19:55 So which part of the system needs to handle the
concurrency?  Does FFS need to be rewhacked, or what?    *
People who say "use disksort" are missing something:
concurrency.  * There's a lot of literature out there, that's
been put out recently,  * about the fact that exposing I/O
concurrency to the OS, and to the  * hardware wins
significantly.  * In the recent SOSP paper that my group did, we
saw some occasionally  * quirky -- but always better --
performance by exposing more concurrency  * to the drive(s).
(The one particular case i can think of, that i  * think was
mentioned in that paper was a case where we were doing grep  *
string * for the files in one manual section, and disclosing our
future  * file accesses to the OS via hints, so that it would
prefetch the data.  * w/ one request outstanding at the drive,
we got horrible performance,  * with many, we got great perform