Hi all, I have a server, with an Intel DG35EC motherboard, Q9300 CPU, 8GB Kingston DDRII RAM which can't take a lot of load. I have 4 XEN VPS's on there, which doesn't consume more than 4GBM RAM at this stage. Yet, the machine sky rockets at some times. I've moved the XEN VPS's to another server, with 4GM RAM, and it doesn't cause the same problems. So, apart from memtest86 how else can I stress test the server to find out what the problem is? -- Kind Regards Rudi Ahlers
Rudi Ahlers wrote:> Hi all, > > I have a server, with an Intel DG35EC motherboard, Q9300 CPU, 8GB > Kingston DDRII RAM which can't take a lot of load. I have 4 XEN VPS's > on there, which doesn't consume more than 4GBM RAM at this stage. Yet, > the machine sky rockets at some times. I've moved the XEN VPS's to > another server, with 4GM RAM, and it doesn't cause the same problems. > > So, apart from memtest86 how else can I stress test the server to find > out what the problem is? >4 instances of mprime (www.mersenne.org), running the torture test, each set to affinity on a different CPU. and, next time get a real server board with ECC.
Rudi Ahlers schrieb:> Hi all, > > I have a server, with an Intel DG35EC motherboard, Q9300 CPU, 8GB > Kingston DDRII RAM which can't take a lot of load. I have 4 XEN VPS's > on there, which doesn't consume more than 4GBM RAM at this stage. Yet, > the machine sky rockets at some times. I've moved the XEN VPS's to > another server, with 4GM RAM, and it doesn't cause the same problems. > > So, apart from memtest86 how else can I stress test the server to find > out what the problem is? > > >http://oca.microsoft.com/en/windiag.asp (Yeah, it's MSFT - but I heard good things about it - memtest is not everything....) I'm not sure if 8 GB and non-ECC (and non-buffered!) actually works that well.... Rainer
> So, apart from memtest86 how else can I stress test the server to find > out what the problem is?Have you looked at Inquisitor? There is a nice article about it which includes a download link at <http://www.linux.com/articles/149774> Hope this helps. Barry
Hi Rudi, On Tue, Nov 18, 2008 at 02:13, Rudi Ahlers <rudiahlers at 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
Rudi Ahlers wrote:> Hi all, > > I have a server, with an Intel DG35EC motherboard, Q9300 CPU, 8GB > Kingston DDRII RAM which can't take a lot of load. I have 4 XEN VPS's > on there, which doesn't consume more than 4GBM RAM at this stage. Yet, > the machine sky rockets at some times. I've moved the XEN VPS's to > another server, with 4GM RAM, and it doesn't cause the same problems. > > So, apart from memtest86 how else can I stress test the server to find > out what the problem is?I think I mentioned this already but I use the Cerberus test suite http://sourceforge.net/projects/va-ctcs/ Haven't had to use it in a while but works quite well, a lot of big OEMs use it as well for their burn in tests. For me it found problems much faster than memtest86. Apparently it was developed by VA Linux(If your familiar with that name) Been meaning to setup a pxe linux boot environment with this in there so I can run it without the full blown OS on there, but haven't had a chance yet. nate
on 11-17-2008 11:13 PM Rudi Ahlers spake the following:> Hi all, > > I have a server, with an Intel DG35EC motherboard, Q9300 CPU, 8GB > Kingston DDRII RAM which can't take a lot of load. I have 4 XEN VPS's > on there, which doesn't consume more than 4GBM RAM at this stage. Yet, > the machine sky rockets at some times. I've moved the XEN VPS's to > another server, with 4GM RAM, and it doesn't cause the same problems. > > So, apart from memtest86 how else can I stress test the server to find > out what the problem is? > >how can I stress a server? Tell it the printer is pregnant? Sorry... I couldn't resist. ;-P It has been a long day. -- MailScanner is like deodorant... You hope everybody uses it, and you notice quickly if they don't!!!! -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 250 bytes Desc: OpenPGP digital signature URL: <http://lists.centos.org/pipermail/centos/attachments/20081118/f2793961/attachment-0003.sig>