Re: [Jython-users] jython-2.1b1 startup time

[Jan W. <j.w...@sc...>]

On Tue, Dec 11, 2001 at 08:28:24PM +0000, Finn Bock wrote:
>=20
> I'm sure it have scanned the jar files. The question is whether jython
> wrote the scan result info cachedir/packages. Is the cachedir/packages
> directory empty or non-existing?
In ~/.jython:
python.cachedir=3D/home/ian/.jython-cachedir
ian@leo > ls -ld /home/ian/.jython-cachedir
drwxr-xr-x    3 ian      s+c            21 Dec  4 15:24 /home/ian/.jython=
-cachedir/=20
ian@leo jsse1.0.2 > ls -ld /home/ian/.jython-cachedir/packages=20
drwxr-xr-x    2 ian      s+c          4096 Dec 11 14:55 /home/ian/.jython=
-cachedir/packages/

So it should be existing and writable. In the packages directory there ar=
e the
files:
ian@leo > ls /home/ian/.jython-cachedir/packages
ant.pkc gl4java.pkc i18n.pkc jython$2.pkc optional.pkc rt$1.pkc sunrsasig=
n$1.pkc
xmlrpc-a$1.pkc crimson.pkc i18n$1.pkc jaxp.pkc jython$3.pkc packages.idx
rt$2.pkc sunrsasign$2.pkc xmlrpc-a.pkc gl4java-glutfonts.pkc i18n$2.pkc
jython$1.pkc jython.pkc png.pkc rt.pkc sunrsasign.pkc
, all -rw-r--r--, owner ian.

>=20
> The problem was fixed in Stefan's case by running a chmod on the files
> and subdirectories in cachedir.
>=20
> The prime suspect is still the lack of caching of the jar scan result.
> Try to remove cachedir just to verify that the startup time become
> significantly larger.

I removed the cachedir and started each jython version two times, and the=
re are
large differences between the first and second startup and not so large b=
etween
2.1a3 and 2.1b1.
Would it help if I tried different Java VMs? Although IBM Java gives a SI=
GSEGV
and must be killed -9, with both jython versions.

ian@leo > rm -rf ~/.jython-cachedir/packages
ian@leo > time jython -c 'import sys; sys.exit()'
*sys-package-mgr*: processing new jar, '/usr/local/jython-2.1b1/jython.ja=
r'
*sys-package-mgr*: processing new jar, '/home/ian/venus/200gui/gui/jar/xm=
lrpc-a.jar'
*sys-package-mgr*: processing new jar, '/usr/java/jdk1.3.1_01/jre/lib/rt.=
jar'
*sys-package-mgr*: processing new jar, '/usr/java/jdk1.3.1_01/jre/lib/i18=
n.jar'
*sys-package-mgr*: processing new jar, '/usr/java/jdk1.3.1_01/jre/lib/sun=
rsasign.jar'

real    0m10.758s
user    0m8.370s
sys     0m0.300s
ian@leo > time jython -c 'import sys; sys.exit()'

real    0m4.886s
user    0m3.440s
sys     0m0.110s
ian@leo > rm -rf ~/.jython-cachedir/packages
ian@leo > time ~/jython-2.1a3/jython -c 'import sys; sys.exit()'
*sys-package-mgr*: processing new jar, '/home/ian/jython-2.1a3/jython.jar=
'
*sys-package-mgr*: processing new jar, '/home/ian/venus/200gui/gui/jar/xm=
lrpc-a.jar'
*sys-package-mgr*: processing new jar, '/usr/java/jdk1.3.1_01/jre/lib/rt.=
jar'
*sys-package-mgr*: processing new jar, '/usr/java/jdk1.3.1_01/jre/lib/i18=
n.jar'
*sys-package-mgr*: processing new jar, '/usr/java/jdk1.3.1_01/jre/lib/sun=
rsasign.jar'

real    0m7.062s
user    0m6.530s
sys     0m0.180s
ian@leo > time ~/jython-2.1a3/jython -c 'import sys; sys.exit()'

real    0m1.878s
user    0m1.610s
sys     0m0.120s

ian@alpha > rm -rf ~/.jython-cachedir/packages
ian@alpha > time ~/jython-2.1a3/jython -c 'import sys; sys.exit()'
*sys-package-mgr*: processing new jar, '/net/leo/home/ian/jython-2.1a3/jy=
thon.jar'
*sys-package-mgr*: processing new jar, '/net/leo/home/ian/venus/200gui/gu=
i/jar/xmlrpc-a.jar'
*sys-package-mgr*: processing new jar, '/usr/opt/java130/jre/lib/rt.jar'
*sys-package-mgr*: processing new jar, '/usr/opt/java130/jre/lib/i18n.jar=
'
*sys-package-mgr*: processing new jar, '/usr/opt/java130/jre/lib/sunrsasi=
gn.jar'

real    0m30.020s
user    0m28.047s
sys     0m0.850s
ian@alpha > time ~/jython-2.1a3/jython -c 'import sys; sys.exit()'

real    0m2.595s
user    0m2.167s
sys     0m0.298s
ian@alpha > rm -rf ~/.jython-cachedir/packages
ian@alpha > time jython -c 'import sys; sys.exit()'
*sys-package-mgr*: processing new jar, '/usr/local/jython-2.1b1/jython.ja=
r'
*sys-package-mgr*: processing new jar, '/net/leo/home/ian/venus/200gui/gu=
i/jar/xmlrpc-a.jar'
*sys-package-mgr*: processing new jar, '/usr/opt/java130/jre/lib/rt.jar'
*sys-package-mgr*: processing new jar, '/usr/opt/java130/jre/lib/i18n.jar=
'
*sys-package-mgr*: processing new jar, '/usr/opt/java130/jre/lib/sunrsasi=
gn.jar'

real    0m36.303s
user    0m33.973s
sys     0m0.935s
ian@alpha > time jython -c 'import sys; sys.exit()'

real    0m11.431s
user    0m10.519s
sys     0m0.428s

I hope this helps, I really want to find the cause of this slowdown.

Cheerio,
--=20
J.W...@sc...  -  Fon +4970719457-257 Fax-211
science+computing ag - Hagellocher Weg 71-75 - 72070 T=FCbingen
Lisp is truly amazing.  Anything that's cool in any language existed in L=
isp
before, and probably is still more usable in Lisp. (W. Tanksley in c.l.py=
thon)