Re: "miniserv.pl" and buffer-increasement

[vuph <vu...@ca...>]

Hi,
I know how Linux system manage buffer/cache.
I have already checked all perl modules is needed by webmin.
Then, it work ok.

Thanks,
--PHAM HUY VU--

----- Original Message -----
From: "Joe Cooper" <jo...@sw...>
To: <web...@li...>
Sent: Monday, September 23, 2002 6:40 PM
Subject: Re: "miniserv.pl" and buffer-increasement


> Oh, you didn't mention you were using an alternate C library.
>
> Regardless, what do you expect the buffer to do?  The job of the
> buffer/cache layer is to buffer disk I/O so that you don't have to wait
> for disks to do their job.  It should go up very rapidly on the start of
> any new program, or while saving out anything to disk.  Have you never
> watched buffer on a normal Linux system running with glibc, or any Unix
> with a properly functioning VM layer?
>
> If it doesn't level off at a reasonable level (i.e. with 3-6MB of free
> RAM) or you see some indication of a leak (buffer increasing is not an
> indication of a leak), then you'll need to take it up with the library
> people.  Webmin does not do memory management--it is a perl program, and
> perl handles memory management behind the scenes for perl programs.  And
> since perl on other C libs does not have any reproduceable leaks that I
> know of, it will be a bug in the memory management functions of the C
> lib you are using.
>
> vuph wrote:
> > Hi all,
> >
> >
> >>What do you mean you have "ported".  As far as I know, Webmin runs as-is
> >>on perl 5.00503.  It certainly causes no problems on the Solaris box I
> >>administer with that perl version.
> >>
> >>And what buffers are you speaking of?
> >
> >
> > I compiled perl5.00503 with uclibc ( www.uclibc.org )
> > [root@vuph webmin]# ldd /usr/bin/perl
> >         libdl.so.0 => /usr/i386-linux-uclibc/lib/libdl.so.0
(0x0x40006000)
> >         libm.so.0 => /usr/i386-linux-uclibc/lib/libm.so.0 (0x0x40009000)
> >         libcrypt.so.0 => /usr/i386-linux-uclibc/lib/libcrypt.so.0
> > (0x0x40017000)
> >         libc.so.0 => /usr/i386-linux-uclibc/lib/libc.so.0 (0x0x4002c000)
> >         ld-uClibc.so.0 => /usr/i386-linux-uclibc/lib/ld-uClibc.so.0
> > (0x0x40000000)
> > -----------------
> > During webmin running system buffer always increase
> > [root@vuph webmin]# free
> >                   total         used         free              shared
> > buffers     cached
> > Mem:         58004      34084      23920          0            5464
> > 12820
> > -/+ buffers/cache:      15800      42204
> > Swap:       530104       5644     524460
> > ////////////////After 1 second
> > [root@vuph webmin]# free
> >                   total         used         free              shared
> > buffers     cached
> > Mem:         58004      34092      23912          0            5472
> > 12820
> > -/+ buffers/cache:      15800      42204
> > Swap:       530104       5644     524460
> > ///////////////////After 15 seconds
> > [root@vuph webmin]# free
> >                   total          used       free               shared
> > buffers     cached
> > Mem:         58004      34220      23784          0            5600
> > 12820
> > -/+ buffers/cache:      15800      42204
> > Swap:       530104       5644     524460
> > --------------------
> > Buffer: 5464->5472->5600
> > The buffer increase very fast
> > ---------------------
> > After I have stoped webmin, the buffer also increase
> > [root@vuph webmin]# /etc/webmin/stop
> > Stopping Webmin server in /usr/local/webmin
> > [root@vuph webmin]# free
> >              total       used       free     shared    buffers
cached
> > Mem:         58004      32396      25608          0       5732
12984
> > -/+ buffers/cache:      13680      44324
> > Swap:       530104       5644     524460
>
> --------------------------------------------------------------------------
--
> > --
> >
> > Thanks
> > --PHAM HUY VU--
> >
> >
> >
> > -------------------------------------------------------
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>
> --
> Joe Cooper <jo...@sw...>
> Web caching appliances and support.
> http://www.swelltech.com
>
>
>
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