Slowness when setting PS1 variable???
Thomas Chadwick
j_tetazoo@hotmail.com
Mon Jan 13 03:04:00 GMT 2003
I recently ran Cygwin setup and installed lots of updates. However, ever
since, I noticed that starting a new shell takes a relatively long time
(we're talking 10 seconds or so between typing "bash" and getting a prompt -
it might not sound like a lot, but try running make on something of moderate
size and see how many times it starts a new shell in the process!!).
I did some debugging, and the slowness seems to only occur when executing my
.bashrc file. More specifically, it seems to block when it gets to this
entry:
# Set the prompt
export PS1="
`whoami`@`uname -n`:\$PWD
$ "
If I take out the `whoami` and `uname -n` parts, the slowness goes away and
bash starts up almost instantaneously. However, what baffles me is if I run
either of these commands at the command-line (immediately after starting a
shell), they return a result immediately.
I guess my question is: why do `whoami` and `uname -n` take so stinking long
to run when inside the PS1 assignment???
Below is the output of cygcheck -s...
Cygwin Win95/NT Configuration Diagnostics
Current System Time: Wed Jan 08 09:04:38 2003
Windows 2000 Professional Ver 5.0 Build 2195 Service Pack 3
Path: .
C:\cygwin\home\tchadwic\bin
C:\cygwin\usr\local\bin
c:\WINNT\system32
c:\WINNT
c:\WINNT\System32\Wbem
c:\Utilities
c:\Program Files\IBM\Trace Facility
c:\Program Files\Personal Communications
c:\Notes
c:\PROGRA~1\COMMON~1\XCPCSync\TRANSL~1\LtNts4
C:\cygwin\bin
C:\cygwin\usr\X11R6\bin
SysDir: C:\WINNT\System32
WinDir: C:\WINNT
HOME = `C:\cygwin\home\tchadwic'
PWD = `/home/tchadwic'
Use `-r' to scan registry
c: hd NTFS 14998Mb 65% CP CS UN PA FC C_DRIVE
d: hd NTFS 509Mb 98% CP CS UN PA SWAP
e: cd N/A N/A
s: net NTFS 70312Mb 0% CP CS PA tchadwic
. /cygdrive user
binmode,cygdrive
C:/cygwin / system binmode
C:/cygwin/bin /usr/bin system binmode
C:/cygwin/lib /usr/lib system binmode
C:\cygwin\usr\X11R6\lib\X11\fonts /usr/X11R6/lib/X11/fonts system binmode
. /cygdrive user
binmode,cygdrive
Found: C:\cygwin\bin\bash.exe
Found: C:\cygwin\bin\cat.exe
Found: C:\cygwin\bin\cpp.exe
Found: C:\cygwin\bin\find.exe
Found: C:\cygwin\bin\gcc.exe
Found: C:\cygwin\bin\gdb.exe
Found: C:\cygwin\bin\ld.exe
Found: C:\cygwin\bin\ls.exe
Found: C:\cygwin\bin\make.exe
Found: C:\cygwin\bin\sh.exe
58k 2002/05/07 C:\cygwin\bin\cygbz2-1.dll
644k 2002/12/08 C:\cygwin\bin\cygcrypto.dll
380k 2002/07/24 C:\cygwin\bin\cygdb-3.1.dll
487k 2002/07/24 C:\cygwin\bin\cygdb_cxx-3.1.dll
45k 2001/04/25 C:\cygwin\bin\cygform5.dll
35k 2002/01/09 C:\cygwin\bin\cygform6.dll
19k 2002/02/20 C:\cygwin\bin\cyggdbm.dll
490k 2002/09/21 C:\cygwin\bin\cygguile-12.dll
488k 2002/07/18 C:\cygwin\bin\cygguile-14.dll
63k 2002/07/18 C:\cygwin\bin\cygguile-srfi-srfi-13-14-1.dll
63k 2002/09/21 C:\cygwin\bin\cygguile-srfi-srfi-13-14-v-1-1.dll
24k 2002/07/18 C:\cygwin\bin\cygguile-srfi-srfi-4-1.dll
24k 2002/09/21 C:\cygwin\bin\cygguile-srfi-srfi-4-v-1-1.dll
14k 2002/07/18 C:\cygwin\bin\cygguilereadline-14.dll
14k 2002/09/21 C:\cygwin\bin\cygguilereadline-v-12-12.dll
17k 2001/06/28 C:\cygwin\bin\cyghistory4.dll
20k 2002/10/10 C:\cygwin\bin\cyghistory5.dll
929k 2002/06/24 C:\cygwin\bin\cygiconv-2.dll
22k 2001/12/13 C:\cygwin\bin\cygintl-1.dll
28k 2002/09/20 C:\cygwin\bin\cygintl-2.dll
21k 2001/06/20 C:\cygwin\bin\cygintl.dll
45k 2002/02/08 C:\cygwin\bin\cygjbig1.dll
119k 2002/02/09 C:\cygwin\bin\cygjpeg6b.dll
59k 2002/09/20 C:\cygwin\bin\cygkpathsea-3-3-7.dll
32k 2002/12/27 C:\cygwin\bin\cygltdl-3.dll
26k 2001/04/25 C:\cygwin\bin\cygmenu5.dll
20k 2002/01/09 C:\cygwin\bin\cygmenu6.dll
156k 2001/04/25 C:\cygwin\bin\cygncurses++5.dll
175k 2002/01/09 C:\cygwin\bin\cygncurses++6.dll
226k 2001/04/25 C:\cygwin\bin\cygncurses5.dll
202k 2002/01/09 C:\cygwin\bin\cygncurses6.dll
15k 2001/04/25 C:\cygwin\bin\cygpanel5.dll
12k 2002/01/09 C:\cygwin\bin\cygpanel6.dll
40k 2001/11/21 C:\cygwin\bin\cygpcre.dll
39k 2001/11/21 C:\cygwin\bin\cygpcreposix.dll
175k 2002/07/22 C:\cygwin\bin\cygpng10.dll
179k 2002/07/22 C:\cygwin\bin\cygpng12.dll
170k 2002/01/21 C:\cygwin\bin\cygpng2.dll
22k 2002/06/09 C:\cygwin\bin\cygpopt-0.dll
108k 2001/06/28 C:\cygwin\bin\cygreadline4.dll
127k 2002/10/10 C:\cygwin\bin\cygreadline5.dll
66k 2001/11/20 C:\cygwin\bin\cygregex.dll
165k 2002/12/08 C:\cygwin\bin\cygssl.dll
550k 2002/12/19 C:\cygwin\bin\cygtcl83.dll
12k 2002/12/19 C:\cygwin\bin\cygtclpip83.dll
253k 2002/02/10 C:\cygwin\bin\cygtiff3.dll
217k 2002/12/19 C:\cygwin\bin\cygtix4183.dll
830k 2002/12/19 C:\cygwin\bin\cygtk83.dll
41k 2002/01/20 C:\cygwin\bin\cygXpm-noX4.dll
46k 2002/01/20 C:\cygwin\bin\cygXpm-X4.dll
50k 2002/03/12 C:\cygwin\bin\cygz.dll
880k 2002/12/25 C:\cygwin\bin\cygwin1.dll
Cygwin DLL version info:
DLL version: 1.3.18
DLL epoch: 19
DLL bad signal mask: 19005
DLL old termios: 5
DLL malloc env: 28
API major: 0
API minor: 69
Shared data: 3
DLL identifier: cygwin1
Mount registry: 2
Cygnus registry name: Cygnus Solutions
Cygwin registry name: Cygwin
Program options name: Program Options
Cygwin mount registry name: mounts v2
Cygdrive flags: cygdrive flags
Cygdrive prefix: cygdrive prefix
Cygdrive default prefix:
Build date: Wed Dec 25 15:37:50 EST 2002
Shared id: cygwin1S3
41k 2002/05/14 C:\cygwin\usr\X11R6\bin\cygPropList-0.dll
Cygwin Package Information
Package Version
WindowMaker 0.80.0-2
XFree86-base 4.2.0-1
XFree86-bin 4.2.0-2
XFree86-etc 4.2.0-1
XFree86-f100 4.2.0-2
XFree86-fenc 4.2.0-2
XFree86-fnts 4.2.0-2
XFree86-fscl 4.2.0-2
XFree86-lib 4.2.0-3
XFree86-man 4.2.0-1
XFree86-prog 4.2.0-1
XFree86-ps 4.2.0-1
XFree86-startup-scripts4.2.0-3
XFree86-xserv 4.2.0-15
_update-info-dir 00113-1
ash 20020731-1
autoconf 2.54-1
autoconf-devel 2.57-1
autoconf-stable 2.13-4
automake 1.7.1-1
automake-devel 1.7.2-1
automake-stable 1.4p5-5
base-files 1.1-1
base-passwd 1.0-1
bash 2.05b-8
binutils 20021117-1
bison 1.75-1
byacc 1.9-1
bzip2 1.0.2-2
clear 1.0-1
cpio 2.5-1
cron 3.0.1-7
crypt 1.0-1
ctags 5.2-1
cvs 1.11.0-1
cygrunsrv 0.95-1
cygutils 1.1.3-1
cygwin 1.3.18-1
cygwin-doc 1.2-1
dejagnu 20021217-1
diff 1.0-1
diffutils 2.8.1-1
ed 0.2-1
emacs 21.2-11
emacs-X11 21.2-11
expect 20021218-1
file 3.37-1
fileutils 4.1-1
findutils 4.1.7-4
flex 2.5.4-2
gawk 3.1.1-5
gcc 3.2-3
gcc-mingw 20020817-4
gdb 20021218-1
gdbm 1.8.0-4
gettext 0.11.5-1
ghostscript 7.05-2
ghostscript-base 7.05-2
ghostscript-x11 7.05-2
gnupg 1.2.1-1
gperf 2.7.2-1
grep 2.5-1
groff 1.18.1-2
gzip 1.3.3-4
inetutils 1.3.2-19
irc 20010101-1
jbigkit 1.2-6
jpeg 6b-7
less 378-1
libPropList 0.10.1-3
libbz2_1 1.0.2-2
libdb3.1 3.1.17-2
libguile12 1.6.0-1
libguile14 1.5.6-5
libiconv2 1.8-2
libintl 0.10.38-3
libintl1 0.10.40-1
libintl2 0.11.5-1
libkpathsea3 20020911-1
libltdl3 20021227-1
libncurses5 5.2-1
libncurses6 5.2-8
libpng 1.2.4-2
libpng10 1.0.14-2
libpng12 1.2.4-2
libpng2 1.0.12-1
libpopt0 1.6.4-4
libreadline4 4.1-2
libreadline5 4.3-2
lilypond 1.6.5-1
lilypond-doc 1.6.5-1
links 0.96-1
login 1.7-1
lynx 2.8.4-4
m4 1.4-1
make 3.79.1-7
man 1.5j-1
mingw 20010917-1
mingw-runtime 2.3-1
mktemp 1.4-1
mt 2.0.1-1
mutt 1.4-1
nano 1.1.10-1
ncftp 3.1.4-1
ncurses 5.2-8
newlib-man 20020801
opengl 1.1.0-6
openssh 3.5p1-2
openssl 0.9.6h-1
patch 2.5.8-2
pcre 3.7-1
perl 5.6.1-2
popt 1.6.4-4
postgresql 7.3-1
python 2.2.2-4
readline 4.3-2
regex 4.4-2
rsync 2.5.5-2
rxvt 2.7.9-4
sed 4.0.1-1
sh-utils 2.0-3
shutdown 1.2-2
squid 2.4.STABLE7-1
ssmtp 2.38.7-3
tar 1.13.25-1
tcltk 20021218-1
tcsh 6.11.00-5
termcap 20020930-1
terminfo 5.2-3
tetex-beta 20020911-1
tetex-bin 20020911-1
tetex-tiny 20020911-1
tetex-x11 20020911-1
texinfo 4.2-4
textutils 2.0.21-1
tidy 021202-1
tiff 3.5.7-1
time 1.7-1
unzip 5.50-1
vim 6.1-2
w32api 2.1-1
wget 1.8.2-2
which 1.5-1
x2x 1.27-2
xpm-nox 4.2.0-1
zip 2.3-2
zlib 1.1.4-1
Use -h to see help about each section
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