Re: Tclkit vs Tclkit Lite VFS performance

On windows with tcl 8.4 things don't look all that bad...

C:\opt\tcl\src\kitbench>tclkitsh vfsperf.tcl
kitten C:/opt/tcl/src/kitbench/kitten.kit
sdx C:/opt/tcl/src/kitbench/sdx.kit
tclkit 8.4.15 : C:/opt/tcl/src/kitbench/tclkitsh84.exe
  lite 8.4.15 : C:/opt/tcl/src/kitbench/tclkit-cli84.exe
                        run one  run two
tclkit {} :             27654.4  22847.0
  lite {} :             27350.7  21835.9
tclkit pkgreq :         29986.8  29551.2
  lite pkgreq :         45906.9  46630.4

tclkit stat :           123.349  133.361
  lite stat :           229.1    229.748
tclkit mtime :          115.989  122.39
  lite mtime :          216.122  223.718
tclkit glob :           1992.81  1944.34
  lite glob :           648.95   646.85
tclkit open :           173.49   173.91
  lite open :           395.8    397.56
tclkit read :           325.0    369.51
  lite read :           453.18   451.39
tclkit read-large :     4447.03  4529.73
  lite read-large :     6500.06  6798.68

However things are much worse with 8.5 ...
C:\opt\tcl\src\kitbench>tclkitsh85 vfsperf.tcl
kitten C:/opt/tcl/src/kitbench/kitten.kit
sdx C:/opt/tcl/src/kitbench/sdx.kit
tclkit 8.5a4 : C:/opt/tcl/src/kitbench/tclkitsh85.exe
  lite 8.5a6 : C:/opt/tcl/src/kitbench/tclkit-cli85.exe

tclkit {} : 21372.4
  lite {} : 34439.7
tclkit pkgreq : 27764.1
  lite pkgreq : 156321.6

tclkit stat : 151.223
  lite stat : 3809.82
tclkit mtime : 153.387
  lite mtime : 3792.815
tclkit glob : 1739.74
  lite glob : 36003.36
154.94 microseconds per iteration
called Tcl_Close on channel with refCount > 0

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.
    while executing
"exec $tclkit << $script"
    ("foreach" body line 3)
    invoked from within
"foreach {name script} {
    stat {
        source $kitten
        set file $kitten/lib/tcllib1.6/doctools/mpformats/idx.text
        puts [time {file ..."
    (file "vfsperf.tcl" line 26)


The tclkit 8.4 executable was built with msvc while the tclkit-cli
executable was built using gcc -- I will try and get them both built
the same way at some point. However the 8.5 executables have both been
built with the same compiler (msvc6). There is a catastophic slowdown
in the 8.5 case and I will guess from  previous experience that this
is to do with the new arbitrary length integer code. MD5 had trouble
with this at one point although I don't know if these tests run
something like that.
I don't know at this time what is causing the stacktrace for 8.5.
Possibly some rechan based issue.

Pat Thoyts