Run oprofile and see where this mod is spending its time. strace is also an
option to see what API it's using (select with a timeout probably).
BTW (not related to your problem) I have submitted a set of fixes to the mono
folks that will make a huge set of methods available that currently
Oracle is apparently closing down their
support for OpenSolaris.
In fairness to them, they are closing down support for their own binary
distribution of OpenSolaris (eponymously and confusingly named). They still
refuse to make any official public statement on the future of the OpenSolaris
I was taught it was pronouced something like: wa lay. The latin v
is more like a w sound.
Also (like Greek), the emphasis is on the penultimate syllable, moving to
ultimate syllable if the statement is an imperative (if I remember correctly).
Yes, this is a problem. We call it virtual hostile. Rob van der Heij
has been doing a tremendous amount of research in this area for the last
4 years, we've been trying to educate our customers (and IBM) on what
this means.
Back in 2001, there was the Linux timer, had the same problem. Got
The non-hostile list is quite short unfortunately. For the most part
Oracle is not hostile and queue drops nicely.
Getting vendors including IBM to:
1. acknowledge the problem is hard.
2. once acknowledged repairing (woops, I mean adding a feature) doesn't
happen quickly or for that matter
I have the source to mod_mono and the right to commit to the Mono source tree.
If we can identify what is waking up then I can make the change(s) to make it
friendlier.
On 8/17/10 11:47 AM, David Kreuter dkreu...@vm-resources.com wrote:
The non-hostile list is quite short unfortunately. For
Hello.
Anyone with experience in configure CUPS to work with PCL Commands,
please contact me off list.
Thanks
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Carlos Bodra
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Sao Paulo - Brazil
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mod_mono itself is just a stub that kicks off the xsp_server app so I assume
you're seeing the process called mono doing the damage. In which case oprofile
is not going to help. strace may produce useful information that we may be
able to track back to a specific method.
On 8/17/10 8:56 AM,
I¹m looking at my system which has mod_mono in the apache config file and
it¹s barely registering on top for CPU though it's quite memory hungry:
1476 wwwrun15 0 59756 28m 6652 S 0.0 5.7 24:58.73 mono
1477 wwwrun15 0 10264 2980 1404 S 0.0 0.6 0:00.00 httpd2-prefork
1478
Yep, this is exactly the problem. These processes do not use much
cpu, but they blip every 10ms or so. You need to check the queue from
the z/VM side to see if they are in Q3. If in Q3, then they are blipping
(think i need to trademark that word).
The reason these blips are so virtual
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David Kreuter wrote:
The non-hostile list is quite short unfortunately. For the most part
Oracle is not hostile and queue drops nicely.
Getting vendors including IBM to:
1. acknowledge the problem is hard.
2. once acknowledged repairing (woops,
I was referring to his observation that he was seeing 55-65% CPU. As for
blipping, that's why I suggested he use strace to see what API is being used if
there is blipping taking place. Unlike java we can't use oprofile to easily
identify the method responsible (if it is blipping). I'll try it
Pat - sure, any intelligent code paths will help. Certainly in a
virtualized environment including but not limited to system z resources
are being shared intensely. The q4 problem (maybe I should trademark
it!) -- errant q3 -- is insidious and damaging.
These aren't grandpa's CMS machines
Fortunately it's no longer a Linux on z only problem anymore. With more systems
being run under VMware, KVM, virtualbox etc. the number of people who are being
affected is getting larger and, hopefully, that translates into vendors whose
applications misbehave being lobbied to get their act
It seems to me that this issue has certain parallels to the current and
long running debate about linux kernel power management hacks targeting
embedded devices (e.g. android wake locks)
Yes and no. The analogy to embedded systems is dead on (especially wrt to
efficient use of resources), but
This is an auto-replied message. I am out of office right now. If you need
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contact my manager, Dawit Bereket at dawit.bere...@oracle.com
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