On 16 August 2013 16:13, Veencamp, Jonathon D. wrote:
> I appreciate the creative thought. Keeping the JVM active for INACTIVE
> development servers is kinda going in the wrong direction.
>
> What I really need is a kernel modification where I could cap the linux
> file cache size. That would m
Message-
From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Meyer,
Kenneth J
Sent: Friday, August 16, 2013 9:04 AM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: linux cache
Couldn't you make sure a mindless JAVA routine is running all the time, which
could at least keep so
, 2013 10:04 AM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: linux cache
Couldn't you make sure a mindless JAVA routine is running all the time, which
could at least keep some of the needed pages from being paged out by z/VM?
If the JVM is always busy, perhaps it would help perf
Couldn't you make sure a mindless JAVA routine is running all the time, which
could at least keep some of the needed pages from being paged out by z/VM?
If the JVM is always busy, perhaps it would help performance?
Ken
snip..
-
got some research ahead of me.
>
> Jon
>
> -Original Message-
> From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Rob
> van der Heij
> Sent: Friday, August 16, 2013 7:51 AM
> To: LINUX-390@VM.MARIST.EDU
> Subject: Re: linux cache
>
> W
Thanks again! I've got some research ahead of me.
Jon
-Original Message-
From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Rob van
der Heij
Sent: Friday, August 16, 2013 7:51 AM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: linux cache
When the pages are owned b
rk, does CMM need to be fully
> configured?
>
> And with "fairness in opinions" in mind, how would you recommend I
> approach my situation Mauro?
>
> Jon
>
>
> -Original Message-----
> From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Rob
> van
U] On Behalf Of Rob van
der Heij
Sent: Friday, August 16, 2013 5:22 AM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: linux cache
The thing that happened to your servers is that drop_caches frees up page
frames in Linux that have not been referenced for a long time. Linux starts
to use them for something else
The thing that happened to your servers is that drop_caches frees up page
frames in Linux that have not been referenced for a long time. Linux starts
to use them for something else, and requires z/VM to page it in. To make
room for that, VM will page out other parts of the guests.
You're still mis
I have read it now. And as I think there's no CMM involved, I still
disagree.
I said I would never ever drop caches because I saw it almost killing a
LPAR. I had a customer that put drop_caches on crontab, and at that time
*every* guest started dropping caches and zVM was crazy doing a lot of
page-
On 15 August 2013 17:34, Mauro Souza wrote:
> You can safely ignore the cache usage on Linux, zVM will realise the page
> was not in use and drop it itself. When Linux needs memory, it will reclaim
> cache pages automatically.
>
> So we disagree. Maybe we wouldn't if you had read the page that I
nning process or another
guest where all memory is utilized.
Do I have a misconception on how that works? With the absence of CMM or
equivalent, is VM natively aware that Linux cache is better to page out than
used memory on another guest? And won't the Linux be excessively penalized
while any
anks (again) Rob!
>
> -Original Message-
> From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Rob
> van der Heij
> Sent: Thursday, August 15, 2013 10:17 AM
> To: LINUX-390@VM.MARIST.EDU
> Subject: Re: linux cache
>
> On 15 August 2013 16:44, Dean, Dav
Fantastic. Thanks (again) Rob!
-Original Message-
From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Rob van
der Heij
Sent: Thursday, August 15, 2013 10:17 AM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: linux cache
On 15 August 2013 16:44, Dean, David (I/S) wrote
On 15 August 2013 16:44, Dean, David (I/S) wrote:
> Is there any benefit (or negative) to running a "drop_cache" periodically?
>
>
I don't find it helpful in most cases, especially since it does not reduce
the server footprint. Shaking up memory like that may even make performance
much worse.
But
Federated Insurance.
-Original Message-
From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Dean,
David (I/S)
Sent: Thursday, August 15, 2013 9:44 AM
To: LINUX-390@VM.MARIST.EDU
Subject: linux cache
Is there any benefit (or negative) to running a "
Is there any benefit (or negative) to running a "drop_cache" periodically?
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| cc:
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| Subject: Limiting
Is there a way to limit the amount of storage that Linux can use for caching
DASD (or block devices)?
I do not want to force Linux not to swap but I want to ensure Linux does not
swap my application and/or data areas out just to cache DASD ...
Regards,
Jeff
--
Jeffrey C Barnard
Barnard Software,
ssage-
From: Mark D Pace [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, April 17, 2002 1:33 PM
To: [EMAIL PROTECTED]
Subject: Linux cache
I should have asked this at WAVV.
One suggestion for improved sharing of resources was to use VM MDC to cache
instead of Linux. I have been unable to find how to l
I should have asked this at WAVV.
One suggestion for improved sharing of resources was to use VM MDC to cache
instead of Linux. I have been unable to find how to limit caching in
Linux. Any know how to accomplish this?
Thanks very much.
Mark D Pace
Senior Systems Engineer
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