 | | | Taroon-list Digest, Vol 18, Issue 3 | Taroon-list Digest, Vol 18, Issue 3 2005-08-04 - By Magnus Andersen
Back
I had a similar problem where it hurt my performance that OS grabbed
free memory resources into cache. In my case I made my shared memory
stay resident by the use of the hugetlb_pool. The server now puts my
entire shared memory realm into memory and it is not available as a
free resource for the OS to grab into cache. This took care of my
performance issues.
Magnus
On 8/4/05, taroon-list-request@(protected)
<taroon-list-request@(protected)> wrote:
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> Today's Topics:
>
> 1. Telnet & 3270 emulation (Shaw, Marco)
> 2. Re: Telnet & 3270 emulation (Cameron Showalter)
> 3. Re: Telnet & 3270 emulation (Ed Wilts)
> 4. Re: Telnet & 3270 emulation (nathan r. hruby)
> 5. Re: taroon] Telnet & 3270 emulation (R P Herrold)
> 6. Red Hat Enterprise WS 3 update 5 memory cache problem? (Comot KL)
> 7. Re: Red Hat Enterprise WS 3 update 5 memory cache problem?
> (Jussi Silvennoinen)
> 8. Re: Red Hat Enterprise WS 3 update 5 memory cache problem?
> (Comot KL)
> 9. Re: Red Hat Enterprise WS 3 update 5 memory cache problem?
> (Arjan van de Ven)
>
>
> -- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- --
>
> Message: 1
> Date: Wed, 3 Aug 2005 13:23:55 -0300
> From: "Shaw, Marco" <Marco.Shaw@(protected)>
> Subject: Telnet & 3270 emulation
> To: <taroon-list@(protected)>
> Message-ID:
> <A8A1C0013B2F944582B8C8BA66B7B27802013CD7@(protected)>
> Content-Type: text/plain; charset="us-ascii"
>
>
> I really don't understand the whole '3270 emulation' bit. I think I am
> searching for a telnet program that supports 3270...
>
> I'm looking for something hopefully packaged with RedHat (Workstation
> 3.0 actually) to replace some Win32 apps like Procomm Plus, Crosstalk
> Attachmate, and Exceed HostExplorer.
>
> Looks like I may need it to have some kind of scripting ability also to
> automate stuff like logins.
>
> I'm just starting to dig into this and am not sure where to start
> exactly so I may even have some of my above terminology wrong.
>
> Marco
>
>
>
> -- ---- ---- ---- ---- ---- --
>
> Message: 2
> Date: Wed, 03 Aug 2005 09:39:30 -0700
> From: Cameron Showalter <cameron@(protected)>
> Subject: Re: Telnet & 3270 emulation
> To: "Discussion of Red Hat Enterprise Linux 3 (Taroon)"
> <taroon-list@(protected)>
> Message-ID: <42F0F342.60908@(protected)>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> are you looking for a windows client? If so, I use Alphacom made by
> omnicomtech.com, works pretty good with telnet and ssh. and you can set
> it to automatically log in, and run commands.
>
> you may also want to look at putty which is free and works on both
> windows and *nix.
>
>
>
> -- ---- ---- ---- ---- ---- --
>
> Message: 3
> Date: Wed, 3 Aug 2005 12:33:50 -0500
> From: Ed Wilts <ewilts@(protected)>
> Subject: Re: Telnet & 3270 emulation
> To: taroon-list@(protected)
> Message-ID: <20050803173350.GA19017@(protected)>
> Content-Type: text/plain; charset=us-ascii
>
> On Wed, Aug 03, 2005 at 01:23:55PM -0300, Shaw, Marco wrote:
> >
> > I really don't understand the whole '3270 emulation' bit. I think I am
> > searching for a telnet program that supports 3270...
> >
> > I'm looking for something hopefully packaged with RedHat (Workstation
> > 3.0 actually) to replace some Win32 apps like Procomm Plus, Crosstalk
> > Attachmate, and Exceed HostExplorer.
>
> This is a good question for us old timers...
>
> TN3270 is not quite like any other telnet and most telnet/ssh programs
> don't do TN3270 at all. Remember that on the Linux platform, the
> terminal connection program typically doesn't do emulation, unlike
> Windows where emulation is done by the application (Kermit is a great
> example of the difference here).
>
> A google search for "linux tn3270" is a good start and led me to
> http://www.planetmvs.com/tn3270/ which in turn found x3270 at
> http://www.geocities.com/SiliconValley/Peaks/7814/index.html
>
> x3270 appears to be actively maintained.
>
> Thankfully I don't have any IBM mainframes around here but it also means
> that I don't have any personal experience with tn3270 products on Linux.
>
> .../Ed
>
> --
> Ed Wilts, RHCE
> Mounds View, MN, USA
> mailto:ewilts@(protected)
> Member #1, Red Hat Community Ambassador Program
>
>
>
> -- ---- ---- ---- ---- ---- --
>
> Message: 4
> Date: Wed, 3 Aug 2005 13:41:33 -0400 (EDT)
> From: "nathan r. hruby" <nhruby@(protected)>
> Subject: Re: Telnet & 3270 emulation
> To: "Discussion of Red Hat Enterprise Linux 3 (Taroon)"
> <taroon-list@(protected)>
> Message-ID: <Pine.LNX.4.62.0508031337220.14529@(protected)>
> Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
>
> On Wed, 3 Aug 2005, Ed Wilts wrote:
>
> > On Wed, Aug 03, 2005 at 01:23:55PM -0300, Shaw, Marco wrote:
> >>
> >> I really don't understand the whole '3270 emulation' bit. I think I am
> >> searching for a telnet program that supports 3270...
> >>
> >> I'm looking for something hopefully packaged with RedHat (Workstation
> >> 3.0 actually) to replace some Win32 apps like Procomm Plus, Crosstalk
> >> Attachmate, and Exceed HostExplorer.
> >
> > This is a good question for us old timers...
> >
> > TN3270 is not quite like any other telnet and most telnet/ssh programs
> > don't do TN3270 at all. Remember that on the Linux platform, the
> > terminal connection program typically doesn't do emulation, unlike
> > Windows where emulation is done by the application (Kermit is a great
> > example of the difference here).
> >
>
> That's not entirely true. Most of the XBased terminal apps do terminal
> emulation of some form, it's just that they tend to choose "xterm" as
> their termtype and most modern systems can grok this.
>
> > A google search for "linux tn3270" is a good start and led me to
> > http://www.planetmvs.com/tn3270/ which in turn found x3270 at
> > http://www.geocities.com/SiliconValley/Peaks/7814/index.html
> >
> > x3270 appears to be actively maintained.
> >
> > Thankfully I don't have any IBM mainframes around here but it also means
> > that I don't have any personal experience with tn3270 products on Linux.
> >
>
> Better yet:
>
> [nathan@(protected) nathan]$ up2date --showall | grep 3270
> Password for root:
> x3270-3.2.20-4.i386
> x3270-text-3.2.20-4.i386
> x3270-x11-3.2.20-4.i386
> [nathan@(protected) nathan]$
>
> I've used x3270 before to interact with a few mainframe apps. Normally
> it's "just worked." I don't know about x3270 supporting scripting,
> macros, or SSL. The SSL bit is easily addressed with stunnel.
>
> -n
>
> --
> -- ---- ---- ---- ---- ---- ---- ---- -----
> nathan hruby <nhruby@(protected)>
> uga enterprise information technology services
> production systems support
> -- ---- ---- ---- ---- ---- ---- ---- -----
>
> "Back in the good old days, we would just look in the system log file to
> see what was really going on. The new crowd of Linux users would rather
> not have to do that, however; they expect the system to tell them,
> politely, that their hardware is on fire and that they are about to deeply
> regret not having run any backups since sometime last winter."
> http://lwn.net/Articles/140815
>
>
>
> -- ---- ---- ---- ---- ---- --
>
> Message: 5
> Date: Wed, 3 Aug 2005 23:40:02 -0400 (EDT)
> From: R P Herrold <herrold@(protected)>
> Subject: Re: taroon] Telnet & 3270 emulation
> To: "Discussion of Red Hat Enterprise Linux 3 (Taroon)"
> <taroon-list@(protected)>
> Message-ID: <Pine.LNX.4.63.0508032325380.15223@(protected)>
> Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
>
> On Wed, 3 Aug 2005, Shaw, Marco wrote:
>
> > I really don't understand the whole '3270 emulation' bit.
> > I think I am searching for a telnet program that supports
> > 3270...
>
> x3270 works fine. Its sources are around forever, in SRPM
> form, and packages up easily if one feels a need for the
> latest and greatest. It may have dropped out of the RH line
> at some point, as I pulled a copy for building purposes on
> some other platform back in 2002.
> ftp://ftp.owlriver.com/pub/mirror/ORC/x3270/
> In doing a test build just now of that SRPM file on a CentOS
> 41 box (a RHEL rebuild project), it builds fine, save a stale
> unpackaged 'desktop link'. Trivial to update. [this file is
> part of a superceded approach to X-desktop management]
>
> I have used both the X and the text console variants without
> any problem.
>
> A screenshot, probably dating back to a RHL 7.3 X-client
> connecting downstream, displayed on a RHL 9 X-server (I see
> that the browser is a Netscape variant at the bottom of the
> screenshot) is at:
> http://www.herrold.com/x3270.png
>
> -- Russ Herrold
>
>
>
> -- ---- ---- ---- ---- ---- --
>
> Message: 6
> Date: Thu, 4 Aug 2005 01:30:53 -0700 (PDT)
> From: Comot KL <comotkl@(protected)>
> Subject: Red Hat Enterprise WS 3 update 5 memory cache problem?
> To: taroon-list@(protected)
> Message-ID: <20050804083054.96359.qmail@(protected)>
> Content-Type: text/plain; charset=iso-8859-1
>
> Hello experts,
>
> I have one system Running RHEL WS 3 update 5 in Sun
> Microsystem Model
> W2100z AMD64 16GB of memory 2GB swap file. Them model
> is a certified
> from redhat
> http://bugzilla.redhat.com/hwcert/show.cgi?id=148524 .
> I'm
> running kernel 2.4.21-32ELsmp.
>
> The situation is that it seems that redhat cannot
> release the cache
> that it have been use. Let say I start 1 program and
> it use 5GB of
> the memory then I quit the program and start another
> new different
> program. Let say that the new program need to use 3GB
> of memory. If
> I use free -m it shows that I've been using 8GB and so
> on... until
> it fill up all the 16GB. If I quit all the programs,
> still it wont
> release the cache.
>
> Is there any command that I can use to release the
> cache. Has anyone
> experience this.
>
> Is there any solution/patch for this issue..
>
> Thanks in advance,
>
> comot.
>
>
>
> __ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____
> Start your day with Yahoo! - make it your home page
> http://www.yahoo.com/r/hs
>
>
>
>
> -- ---- ---- ---- ---- ---- --
>
> Message: 7
> Date: Thu, 4 Aug 2005 11:45:56 +0300 (EEST)
> From: Jussi Silvennoinen <jussi_taroon@(protected)>
> Subject: Re: Red Hat Enterprise WS 3 update 5 memory cache problem?
> To: taroon-list@(protected)
> Message-ID: <Pine.LNX.4.44.0508041143240.30547-100000@(protected)>
> Content-Type: TEXT/PLAIN; charset=US-ASCII
>
> > The situation is that it seems that redhat cannot release the cache
> > that it have been use. Let say I start 1 program and it use 5GB of the
> > memory then I quit the program and start another new different program.
> > Let say that the new program need to use 3GB of memory. If I use free -m
> > it shows that I've been using 8GB and so on... until it fill up all the
> > 16GB. If I quit all the programs, still it wont release the cache.
> >
> > Is there any command that I can use to release the
> > cache. Has anyone experience this.
>
> Why should it "release the cache" if nothing actually needs the memory?
> This is not Solaris which hides things from you unless you install
> software which can tell you whats actually going on.
>
> --
>
> Jussi
>
>
>
> -- ---- ---- ---- ---- ---- --
>
> Message: 8
> Date: Thu, 4 Aug 2005 02:06:32 -0700 (PDT)
> From: Comot KL <comotkl@(protected)>
> Subject: Re: Red Hat Enterprise WS 3 update 5 memory cache problem?
> To: taroon-list@(protected)
> Message-ID: <20050804090632.82796.qmail@(protected)>
> Content-Type: text/plain; charset=iso-8859-1
>
> Jussi,
>
> You don't get me. If the os start taking all the
> memory and swap and nothing left, your machine will
> freez.
>
> It suppose to free all the memory that have not been
> use instead eat a bit by bit until nothing left..
>
> It seem that the same issue since update 3...
>
> Anyone... is there any way to free unused memory??
>
> Thanks,
> comot.
>
> --- Jussi Silvennoinen <jussi_taroon@(protected)>
> wrote:
>
> > > The situation is that it seems that redhat cannot
> > release the cache
> > > that it have been use. Let say I start 1 program
> > and it use 5GB of the
> > > memory then I quit the program and start another
> > new different program.
> > > Let say that the new program need to use 3GB of
> > memory. If I use free -m
> > > it shows that I've been using 8GB and so on...
> > until it fill up all the
> > > 16GB. If I quit all the programs, still it wont
> > release the cache.
> > >
> > > Is there any command that I can use to release the
> > > cache. Has anyone experience this.
> >
> > Why should it "release the cache" if nothing
> > actually needs the memory?
> > This is not Solaris which hides things from you
> > unless you install
> > software which can tell you whats actually going on.
> >
> > --
> >
> > Jussi
> >
> > --
> > Taroon-list mailing list
> > Taroon-list@(protected)
> > http://www.redhat.com/mailman/listinfo/taroon-list
> >
>
>
>
>
> __ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____
> Start your day with Yahoo! - make it your home page
> http://www.yahoo.com/r/hs
>
>
>
>
> -- ---- ---- ---- ---- ---- --
>
> Message: 9
> Date: Thu, 04 Aug 2005 12:15:29 +0200
> From: Arjan van de Ven <arjanv@(protected)>
> Subject: Re: Red Hat Enterprise WS 3 update 5 memory cache problem?
> To: "Discussion of Red Hat Enterprise Linux 3 (Taroon)"
> <taroon-list@(protected)>
> Message-ID: <1123150530.3318.12.camel@(protected)>
> Content-Type: text/plain; charset="us-ascii"
>
> On Thu, 2005-08-04 at 02:06 -0700, Comot KL wrote:
> > Anyone... is there any way to free unused memory??
>
> unused memory is freed automatic right when it becomes unused.
>
> cached memory is not unused. It's there for future use! And will be made
> unused by the kernel on demand, eg by asking it for memory for other
> purposes.
>
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> End of Taroon-list Digest, Vol 18, Issue 3
> ******************************************
>
--
Magnus Andersen
Systems Administrator / Oracle DBA
Walker & Associates, Inc.
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