On 2011-08-29 07:56+1000 Ben Peddell wrote:
On 29/08/2011 2:37 AM, Alan W. Irwin wrote:
bash.exe-3.1$ time /z/home/wine/newstart1/MinGW/msys/1.0/bin/echo.exe
hello
hello
real 0m0.503s
user 0m0.080s
sys 0m0.020s
Also, I tried
time (x; x; x; x; x; x; x; x; x; x), where "x" represents the complete
echo command above, and the result was
real 0m5.281s
user 0m0.800s
sys 0m0.200s
[snip]
While I am doing those additional investigations, please consider the
question of why there is a huge difference between built-in and
executable latency for MSYS bash commands under wine. To start that
investigation it would be good to compare the wine results for those
two cases with the Windows results for those two cases. (I assume the
two time results for built-in versus executable will be fairly similar
in the Windows case, but that assumption needs to be checked.) I don't
have access to Windows myself. Anybody up for doing that simple test
and reporting the results back here? The automatic MinGW/MSYS
installer at http://sourceforge.net/projects/mingw/files/Automated
MinGW Installer/mingw-get-inst/ makes it easy to install the relevant
MinGW/MSYS software on both wine and Windows.
Under MSYS 1.0.17 running on Windows 7 x64 SP1:
bash.exe-3.1$ /bin/bash --version
GNU bash, version 3.1.17(1)-release (i686-pc-msys)
Copyright (C) 2005 Free Software Foundation, Inc.
bash.exe-3.1$ alias x='/bin/echo.exe -n .'
bash.exe-3.1$ time x
.
real 0m0.031s
user 0m0.000s
sys 0m0.015s
bash.exe-3.1$ time (x;x;x;x;x;x;x;x;x;x)
..........
real 0m0.296s
user 0m0.075s
sys 0m0.136s
This shows a latency of approximately 2 jiffies for each command - 1
jiffy in Windows is 15.6ms.
--
Ben Peddell
IT Support Bowen, Collinsville, Proserpine and Home Hill Catholic schools
http://klightspeed.killerwolves.net/
Thanks, Ben, for doing the requested test for the executable echo
test. That shows the Windows startup latency is measureable but
acceptable for that executable. Just out of curiosity, what happens
for the corresponding bash executable built-in echo functionality? Is
it essentially instantaneous (i.e., elapsed time less than 0.001
seconds) like in the wine case?
Alan
__________________________
Alan W. Irwin
Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).
Programming affiliations with the FreeEOS equation-of-state
implementation for stellar interiors (freeeos.sf.net); the Time
Ephemerides project (timeephem.sf.net); PLplot scientific plotting
software package (plplot.sf.net); the libLASi project
(unifont.org/lasi); the Loads of Linux Links project (loll.sf.net);
and the Linux Brochure Project (lbproject.sf.net).
__________________________
Linux-powered Science
__________________________
