diff options
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 65 |
1 files changed, 52 insertions, 13 deletions
@@ -1,12 +1,43 @@ -2001-09-06 Don Porter <dgp@users.sourceforge.net> - - * doc/http.n: - * library/http/*.tcl: - * tools/tcl.wse.in: - * tools/tclmin.wse: - * unix/Makefile.in: - * win/{Mm}akefile.*: Updated http package to version 2.4, - reflecting the new features just added. +2001-09-06 Andreas Kupries <andreas_kupries@users.sourceforge.net> + + * All the changes below serve to fix bug [219148] which reports a + 80x performance hit for file I/O on Win* systems. On my system + it was closer to a 120x hit. Problem report by Uwe Traum <no + email address available>. + + The fix goes like this: The obstacle is 'FlushFileBuffers', + executed whenever Tcl writes data to the OS, as Tcl has to wait + for the disk to complete I/O, and disks are slow. We remove that + obstacle. This opens another problem, [file size] reports back + wrong numbers. So for [file size] we add the call back in. As + optimization we keep track of the channels which were written to + and flush only these. + + * win/tclWinFile.c (TclpObjStat): Added a call to + 'TclWinFlushDirtyChannels'. This ensures that [file size] and + related commands report the correct size of a file even if Tcl + has recently written to it. Unixoid OS's always report the + correct size even for files with pending data, but Win* + syssystem don't. They only report what is actually on disk. + + * win/tclWinInt.h: Added declaration of + 'TclWinFlushDirtyChannels', making it available to other parts + of the tcl core. + + * win/tclWinChan.c (TclWinFlushDirtyChannels): New, internal, + procedure. Goes through the list of open file channels and + forces the OS to flush its file buffers for all which were + written to since the last call of this function. This is an + expensive operation as Tcl has to wait for the OS to complete + actual writes to the disk. + + (FileInfo): Added dirty flag required by the procedure above. + + (FileOutputProc): Removed flushing of file buffers, setting the + dirty flag instead. This means that the previously incurred + delays do not happen anymore. + + (TclWinOpenFileChannel): Added initialization of 'dirty' flag. 2001-09-06 Jeff Hobbs <jeffh@ActiveState.com> @@ -24,10 +55,18 @@ 2001-09-06 Don Porter <dgp@users.sourceforge.net> - * tests/unixInit.test (unixInit-3.2): Updated test to support - newer HP-UX releases that properly report euc-jp as the system - encoding for Japanese. Bug report and patch verification by - Bob Techentin. [Bug 453883] + * tests/unixInit.test (unixInit-3.2): Updated test to support + newer HP-UX releases that properly report euc-jp as the system + encoding for Japanese. Bug report and patch verification by Bob + Techentin. [Bug 453883] + + * doc/http.n: + * library/http/*.tcl: + * tools/tcl.wse.in: + * tools/tclmin.wse: + * unix/Makefile.in: + * win/{Mm}akefile.*: Updated http package to version 2.4, + reflecting the new features just added. 2001-09-06 Vince Darley <vincentdarley@users.sourceforge.net> |