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* [TUHS] 'Huge' file support removed from PWB1
@ 2023-03-08 13:10 Noel Chiappa
  2023-03-09  8:21 ` [TUHS] " Kenneth Goodwin
                   ` (2 more replies)
  0 siblings, 3 replies; 8+ messages in thread
From: Noel Chiappa @ 2023-03-08 13:10 UTC (permalink / raw)
  To: tuhs

In PWB1, support for 'huge' files appears to have been removed. If one
compares bmap() in PWB1'S subr.c with V6's, the "'huge' fetch of double
indirect block" code is gone. I guess PWB didn't need very large (> 8*256*512
= 1,048,576 bytes) files? I'm not sure what the _benefits_ of removing it
were, though - unless PWB was generating lots of files of between 7*256*512
and 8*256*512 bytes in length, and they wanted to avoid the overhead of the
double-indirect block? (The savings in code space are derisory - unlike in
LSX/MINI-UNIX.) Anyone know?

		Noel

^ permalink raw reply	[flat|nested] 8+ messages in thread

end of thread, other threads:[~2023-03-09 23:26 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-03-08 13:10 [TUHS] 'Huge' file support removed from PWB1 Noel Chiappa
2023-03-09  8:21 ` [TUHS] " Kenneth Goodwin
2023-03-09 12:40   ` Jonathan Gray
2023-03-09 15:07   ` Ron Natalie
2023-03-09 15:13     ` Ron Natalie
2023-03-09 17:35     ` arnold
2023-03-09 17:01 ` Tom Ivar Helbekkmo via TUHS
2023-03-09 23:25 ` Clem Cole

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