Re: Why Does restart/gracefull makes httpd grow ?
On Thu, Oct 19, 2000 at 01:55:50PM -0400, Philippe M. Chiasson wrote:
> Hi, I recently upgraded our servers to mod_perl 1.24.1 so I decided to
> give DSO mod_perl a try. And it now works perfectly, even with our perl
> modules implementing core httpd configuration directives (Wich was broken
> under DSO until 24.1)
>
> So, I decided to start playing with restart/graceful too, thinking that DSO might
>solve
> the problems of cleanly restarting a mod_perl server without loss of service...
>
> Here is a bit of top while restarting my server a few times :
[]
I've found that mod_so combined with Perl's dynamic loading causes this memory
leakage.
I ended up compiling apache without mod_so (i.e. all modules compiled in static, no
DSO) and
I do not see this memory leakage at all.
> And everything apparently behaves fine and keeps on working, but my main question is
>where is the 12Mb that adds to
> each process on restart comes from ? What is hapenning ?
>
> I know these issues have been brought before in the case of statically compiled-in
>mod_perl, but doesn't restarting the
> server freeing libperl.so and re-loading it freshly ?
>
> Any information would be more than welcome ...
>
> ## My version info is :
> Redhat 6.2 running on a i386 Linux 2.2.17
>
> Server version: Apache/1.3.14 (Unix)
> Server built: Oct 18 2000 14:00:36
>
> perl5 (5.0 patchlevel 5 subversion 3)
>
> mod_perl 1.24.1
>
> /usr/local/apache/bin/httpd -l
> Compiled-in modules:
> http_core.c
> mod_so.c
>
>
> --
> +---+
> | Philippe M. Chiasson <[EMAIL PROTECTED]> |
> | SmartWorker http://www.smartworker.org|
> | IM : gozerhbe ICQ : gozer/18279998 |
> +---+
> /* * Hash table gook.. */
> -- Linux2.4.0-test2
> /usr/src/linux/fs/buffer.c
>
> perl -e '$$=\${gozer};{$_=unpack(P26,pack(L,$$));/^Just Another Perl
>Hacker!\n$/&&print||$$++&&redo}'
--
Paul Lindner
[EMAIL PROTECTED]
Red Hat Inc.
Why Does restart/gracefull makes httpd grow ?
Hi, I recently upgraded our servers to mod_perl 1.24.1 so I decided to
give DSO mod_perl a try. And it now works perfectly, even with our perl
modules implementing core httpd configuration directives (Wich was broken
under DSO until 24.1)
So, I decided to start playing with restart/graceful too, thinking that DSO might solve
the problems of cleanly restarting a mod_perl server without loss of service...
Here is a bit of top while restarting my server a few times :
#INITIAL STARTUP
PID USER PRI NI SIZE SWAP RSS SHARE STAT LIB %CPU %MEM TIME COMMAND
17940 nobody10 0 275920 26M 27376 S 0 0.0 2.6 0:00
/usr/local/apache/bin/httpd -Dhttpd_perl
17941 nobody10 0 275920 26M 27376 S 0 0.0 2.6 0:00
/usr/local/apache/bin/httpd -Dhttpd_perl
17942 nobody10 0 275920 26M 27376 S 0 0.0 2.6 0:00
/usr/local/apache/bin/httpd -Dhttpd_perl
17943 nobody10 0 275920 26M 27376 S 0 0.0 2.6 0:00
/usr/local/apache/bin/httpd -Dhttpd_perl
17944 nobody10 0 275920 26M 27380 S 0 0.0 2.6 0:00
/usr/local/apache/bin/httpd -Dhttpd_perl
17939 root 10 0 275160 26M 27312 S 0 0.0 2.6 0:01
/usr/local/apache/bin/httpd -Dhttpd_perl
#RESTART #1
17971 nobody 5 0 401160 39M 39888 S 0 0.0 3.8 0:00
/usr/local/apache/bin/httpd -Dhttpd_perl
17972 nobody 7 0 401160 39M 39888 S 0 0.0 3.8 0:00
/usr/local/apache/bin/httpd -Dhttpd_perl
17973 nobody 9 0 401160 39M 39888 S 0 0.0 3.8 0:00
/usr/local/apache/bin/httpd -Dhttpd_perl
17974 nobody10 0 401160 39M 39888 S 0 0.0 3.8 0:00
/usr/local/apache/bin/httpd -Dhttpd_perl
17975 nobody10 0 401160 39M 39888 S 0 0.0 3.8 0:00
/usr/local/apache/bin/httpd -Dhttpd_perl
17961 root 10 0 400400 39M 39816 S 0 0.0 3.8 0:03
/usr/local/apache/bin/httpd -Dhttpd_perl
#RESTART #2
17980 nobody 6 0 526400 51M 52404 S 0 0.6 5.0 0:00
/usr/local/apache/bin/httpd -Dhttpd_perl
17981 nobody13 0 526400 51M 52404 S 0 0.2 5.0 0:00
/usr/local/apache/bin/httpd -Dhttpd_perl
17982 nobody16 0 526400 51M 52404 S 0 0.0 5.0 0:00
/usr/local/apache/bin/httpd -Dhttpd_perl
17983 nobody18 0 526400 51M 52404 S 0 0.0 5.0 0:00
/usr/local/apache/bin/httpd -Dhttpd_perl
17984 nobody19 0 526400 51M 52404 S 0 0.0 5.0 0:00
/usr/local/apache/bin/httpd -Dhttpd_perl
17961 root 19 0 525600 51M 52332 S 0 41.1 5.0 0:05
/usr/local/apache/bin/httpd -Dhttpd_perl
[...]
#RESTART #5
18007 nobody 8 0 902040 88M 89976 S 0 7.1 8.7 0:00
/usr/local/apache/bin/httpd -Dhttpd_perl
18008 nobody 9 0 902040 88M 89976 S 0 0.0 8.7 0:00
/usr/local/apache/bin/httpd -Dhttpd_perl
18009 nobody10 0 902040 88M 89976 S 0 2.3 8.7 0:00
/usr/local/apache/bin/httpd -Dhttpd_perl
18010 nobody11 0 902040 88M 89976 S 0 4.7 8.7 0:00
/usr/local/apache/bin/httpd -Dhttpd_perl
18011 nobody15 0 902040 88M 89976 S 0 0.0 8.7 0:00
/usr/local/apache/bin/httpd -Dhttpd_perl
17961 root 15 0 901280 88M 89908 S 0 57.2 8.6 0:11
/usr/local/apache/bin/httpd -Dhttpd_perl
And everything apparently behaves fine and keeps on working, but my main question is
where is the 12Mb that adds to
each process on restart comes from ? What is hapenning ?
I know these issues have been brought before in the case of statically compiled-in
mod_perl, but doesn't restarting the
server freeing libperl.so and re-loading it freshly ?
Any information would be more than welcome ...
## My version info is :
Redhat 6.2 running on a i386 Linux 2.2.17
Server version: Apache/1.3.14 (Unix)
Server built: Oct 18 2000 14:00:36
perl5 (5.0 patchlevel 5 subversion 3)
mod_perl 1.24.1
/usr/local/apache/bin/httpd -l
Compiled-in modules:
http_core.c
mod_so.c
--
+---+
| Philippe M. Chiasson <[EMAIL PROTECTED]> |
| SmartWorker http://www.smartworker.org|
| IM : gozerhbe ICQ : gozer/18279998 |
+---+
/* * Hash table gook.. */
-- Linux2.4.0-test2
/usr/src/linux/fs/buffer.c
perl -e '$$=\${gozer};{$_=unpack(P26,pack(L,$$));/^Just Another Perl
Hacker!\n$/&&print||$$++&&redo}'
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