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Re: how can I stress a server?

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Filipe Brandenburger Re: [CentOS] how can I stress a server?
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Hi Rudi,

On Tue, Nov 18, 2008 at 02:13, Rudi Ahlers <rudiahlers@gmail.com> wrote:
> ...which can't take a lot of load...
> ...the machine sky rockets at some times...

The problem you have is that the Load Average is too high?

If that is indeed your problem, there is no way that this can be a
memory or CPU issue, since those would cause crashes and not high Load
Average.

If what you have is high Load Average, check this:
- Your machine has 8GB RAM. Are you using the 64-bit version of
CentOS? There would be an overhead in using a 32-bit PAE version on a
machine with more than 4GB, last time I tried it (some years ago) the
overhead was big enough to make a difference in the server's
performance.
- Your machine has SATA. If you don't use the correct SATA settings on
the BIOS, CentOS may use it in a backwards compatible mode and you
will not get enough performance out of it (see previous posts on
problems on SATA and on AHCI). If that's the case, changing the BIOS
settings might make a huge difference, but beware that if you do your
machine may no longer boot with the OS you installed right now. Better
thing to do would be to reinstall it once you found the right setting.

And next time, please state your problem clearly ("high Load Average")
instead of jumping the gun and saying you have a CPU or RAM issue
which does not seem to be the case here.

HTH,
Filipe
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Thread : how can I stress a server?
1)
Rudi Ahlers Hi all, I have a server, with an Intel DG35EC motherboard, Q9300 CPU, 8GB Kingston DDRII RAM which...
2)
John R Pierce 4 instances of mprime (www.mersenne.org), running the torture test, each set to affinity on a...
3)
Rudi Ahlers Next time I won't ask, don't worry
4)
Rudi Ahlers John, just cause the machines we use to serve web content to our clients doesn't use the grade of...
5)
John R Pierce ECC memory would have caught any memory errors, (including memory timing), and give a diagnostic...
6)
Rudi Ahlers John, I know what ECC does. I have 2 Dell PE860 servers with 8GB ECC DDRII RAM as well, and they're...
7)
Kai Schaetzl Rudi Ahlers wrote on Tue, 18 Nov 2008 11:25:31 +0200:...
8)
Matthew Kent stress! Configured correctly it will abuse a server pretty hard...
9)
boisver...@videotron.ca Wow! Everybody doing serious business wouldn't go without it (i work for a couple of Banks and...
10)
Rudi Ahlers I wasn't rejecting server grade hardware. I was a bit irritated by the fact that I don't have...
11)
RobertH Rudi, dont be irritated. you can afford server grade hardware no prob. goto ebay and search for...
12)
Kai Schaetzl RobertH wrote on Thu, 20 Nov 2008 09:15:03 -0800: And how does he squeeze that in 1U? AFAIR, Rudi's...
13)
RobertH Kai, it can be purcased and shipped to him, no biggie. you ask how does a DL380 G3 fit in 1U? not a...
14)
Kai Schaetzl A413A83E9A59C79A1C076@msys1> RobertH wrote on Thu, 20 Nov 2008 13:09:58 -0800: Sorry, I overlooked...
15)
RobertH kai, dont be sorry, i miss things in email here and there too. im make more *general* mistakes than...
16)
Rudi Ahlers Hi Kai, It's as you stated, server grade hardware are a) rather expensive in South Africa, b) very...
17)
William L. Maltby Having watched all this thread, I note that certain things are not mentioned. Assuming that you...
18)
Rob Townley Does this system have shared video/system RAM? If you have video memory shared with system memory,...
19)
nate Wondering if you had heard of this project? I don't trust doing this sort of thing myself(paranoid)...
20)
Scott Silva This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --==============56222904=Content-Type:...
21)
John R Pierce I dunno about Dell, but most vendors, their own 'branded' hard drives have customized firmware...
22)
Rudi Ahlers This is interesting, thank you for letting me know :) Sun, IBM & HP servers in our country are far...
23)
Les Mikesell I'm confused. Aren't you the same person who just put together some stuff that doesn't work well -...
24)
Rudi Ahlers Yes, the motherboard ended up being faulty. But what I said here is from a different supplier. I...
25)
Scott Silva This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --==============57993218=Content-Type:...
26)
Les Mikesell I kind of lost track of this thread and missed any useful performance information if you posted it....
27)
Scott Silva This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --==============13235843=Content-Type:...
28)
boisver...@videotron.ca Hi Rudy, John is a veteran on this list and you could probably learn many things from him. I...
29)
Rainer Duffner http://oca.microsoft.com/en/windiag.asp everything....) I'm not sure if 8 GB and non-ECC (and...
30)
Tru Huynh worse: Appendix System requirement Windows Memory Diagnostic is limited to testing only the first 4...
31)
Rudi Ahlers I don't use Windows, so this wouldn't have helped in anycase :)
32)
Rainer Duffner It's a boot CD... Rainer
33)
Rudi Ahlers Oh, my bad. I saw the microsoft.com URL :)
34)
Tru Huynh It's a diag floppy/cdrom, you don't need windows... except to expand it to the media. Read at least...
35)
Rudi Ahlers Tru, The hardware works, but the moment I start running server based application (i.e. XEN VPS's),...
36)
Rudi Ahlers Oh, and don't take this the wrong way, but the link to a microsoft related program (in my opinion)...
37)
Rainer Duffner SPEC 2006 Rainer...
38)
Ross Walker Or the LTP (Linux Test Project). -Ross
39)
Tru Huynh install sysstat and read the collected data with sar(1). Check for your IOwait. You don't provide...
40)
Barry Brimer Have you looked at Inquisitor? There is a nice article about it which includes a download link at...
41)
Filipe Brandenburger Hi Rudi, The problem you have is that the Load Average is too high? If that is indeed your problem,...
42)
Rudi Ahlers Hi Flippie, I have checked the BIOS settings, purely cause the new HDD was installed on a machine...
43)
David G. Mackay I seem to recall that one of the differences between AMD and Intel virtualization is that AMD chips...
44)
Rudi Ahlers Hi Dave, My experience & knowledge of AMD is limited, so I stick to what I know, Intel. The only...
45)
nate I think I mentioned this already but I use the Cerberus test suite...
46)
Rudi Ahlers Thanx nate, I'll check it out :)
47)
Scott Silva This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --==============62094278=Content-Type:...
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