Text 319, 44 rader
Skriven 2006-10-17 21:07:48 av Mike Luther (1:117/3001.0)
    Kommentar till text 318 av Richard Steiner (1:123/789.0)
Ärende: Connection problems??
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In deed ..

 RS> HPFS came from MS (Gordon Letwin), but he actually had a clue.  :-)

From my prized copy of "Inside OS/2" by Gordon Letwin, Chief Architect Systems
Software, Microsoft, I note that the foundation for the HPFS might be there
courtesy of him as early as even version 1.0.  That discussion begins on page
197 of the book and ends on page 203.  He notes, "Naturally every DosRead or
DosWrite call takes time to execute,so if your program makes few I/O calls,
each for large amounts of data,it will execute faster."

Further he goes on, "I/O performance can be further improved by making sector
aligned calls, that is by requesting a transfer of an integral multiple of 512
bytes to or from a file seek position that is itself a multiple of 512.  OS/2
reads and writes entire disk sectors directly from and to the device hardware
without an intermediate copy step through the system buffers.  Because the file
system keeps logically adjacent sectors physically adjacent on the disk, disk
seek times and rotational latency are such that one can read or write four
sectors of data (2048 bytes) in essentially the same time needed to read or
write one sector (512 bytes).

But as far as I can tell .. the actual name "HPFS" file system didn't come
about until long after Bill Gates wrote in the Foreward of that book, "OS/2 is
destined to be a very important piece of software. During the next 10 years
millions of programmers and users will utilize this system."  And long after,
as Gates further wrote, of Gordon Letwin, "He put a sign on his door that read

     Do not disturb, feed, poke, tease ... the animal

and in 5 months wrote the superb compiler that is the the basis for all our
Basic compilers."

But as far as I can recall, the actual name "HPFS" for the file system didn't
at least start out under his ideaship.  It isn't in that book as far as I have
ever seen.



--> Sleep well; OS/2's still awake! ;)

Mike @ 1:117/3001

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