[Tcl-bugs] [ tcl-Bugs-219300 ] -buffersize seems to do nothing (?)

[<no...@so...>]

Bugs item #219300, was opened at 2000-10-25 22:10
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Category: 26. Channel Types
Group: = 8.2
>Status: Pending
Resolution: None
Priority: 4
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Andreas Kupries (andreas_kupries)
Summary: -buffersize seems to do nothing (?)

Initial Comment:
OriginalBugID: 2653 Bug
Version: 8.2
SubmitDate: '1999-08-31'
LastModified: '1999-11-07'
Severity: SER
Status: UnAssn
Submitter: techsupp
ChangedBy: hobbs
OS: Windows 95
Machine: X86
FixedDate: '2000-10-25'
ClosedDate: '2000-10-25'


Name:
keith lea

ObservedBehavior:
% fconfigure file56e9fc
    -blocking 1 -buffering full -buffersize 1048576 -encoding binary
    -eofchar {} -translation lf
    
    and yet, when copying to this file from a socket, the disk buzzes
    nonstop and the file's size increases steadily, instead of every
    megabyte. I do not use [flush].

DesiredBehavior:
configuring a channel as "-buffersize 1048576" should not write to the
    disk until the buffer reaches 1048576 bytes.





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Comment By: Andreas Kupries (andreas_kupries)
Date: 2001-09-11 12:57

Message:
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keith lea = <ke...@cs...>

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Comment By: Andreas Kupries (andreas_kupries)
Date: 2001-09-07 13:42

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A patch for Performance Bug #219148 (I/O for NT is 80-100
times slower than for Unix) was submitted today to the 8.4
and 8.3.3 branches. The submitter of this item is asked to
check if that patch helps him in his situation too.


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Comment By: Andreas Kupries (andreas_kupries)
Date: 2001-08-24 10:29

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A script exercising the problem would be nice.


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Comment By: Andreas Kupries (andreas_kupries)
Date: 2001-08-23 17:35

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Was something written to the file before the greater 
buffersize was configured ?

It could be a case or reusing the small buffer from
such a previous write.

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Comment By: Andreas Kupries (andreas_kupries)
Date: 2001-08-23 14:39

Message:
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See Tcl Bug #219148 for the item Donal spoke of.

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Comment By: Andreas Kupries (andreas_kupries)
Date: 2001-07-18 18:27

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This is not necessary a problem of the windows channel 
code. He claims that the write occurs before the buffer is 
full. This claim we will have to check.


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Comment By: Donal K. Fellows (dkf)
Date: 2001-01-31 12:40

Message:
This is a known misfeature of the Windows file channel code; it flushes on every write.  Apparently, this is necessary to get certain tests to behave in an expected way, but I reckon that it is probably better to rethink the tests instead...  :^)

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