[Cialug] One of my new servers
David Bierce
david at bierce.org
Wed Jul 15 17:40:57 CDT 2009
I run Ubuntu 8.04LTS on 8 core machines with 24GB of RAM using the
stock 64-bit server 2.6.24 kernel without issue.
Most of the processes I run on the box are set to load the box up to N
+1 cores and it has been performing marvelously. The database machine
in that setup does have a little bit of a cache thrashing issue, but
that is more of an application issue with the version of Postgres I'm
running.
The weirdest thing I've noticed is actually running with gobs of
memory. On some machines that only do batch processing, it's enough
memory that most files you write to the disk will stay in the cache
for a long time. So you write out your 6GB file, then go to compress
it and all of your disk activity is writes, since its pulling it from
cache. Also make your results from doing a quick I/O check on an idle
system doing a DD write DD read a little skewed.
Dave
On Jul 15, 2009, at 3:33 PM, Nathan C. Smith wrote:
> Yeah, stick to centos and don't try Debian or ubuntu unless you want
> to rebuild the kernels for more CPUs.
>
> I asked where all my CPUs were about a year ago on an 4 CPU Quad core.
>
> -Nate
>
> From: cialug-bounces at cialug.org [mailto:cialug-bounces at cialug.org]
> On Behalf Of Tom Pohl
> Sent: Wednesday, July 15, 2009 2:37 PM
> To: Central Iowa Linux Users Group
> Subject: [Cialug] One of my new servers
>
> I'm starting to build up one of my new servers (a Quad 6-core box
> with 64GB of ram). Has anyone ever worked on a linux box this big
> that has any advice on gotchas that might get me due to the massive
> number of CPU's and RAM. I'm running 64 bit centos 5.3 and it seems
> to be working fantastic ... almost too easy :)
>
>
>
> CPU0 CPU1 CPU2 CPU3 CPU4
> CPU5 CPU6 CPU7 CPU8 CPU9 CPU10
> CPU11 CPU12 CPU13 CPU14 CPU15 CPU16
> CPU17 CPU18 CPU19 CPU20 CPU21 CPU22
> CPU23
> 0: 2209320 0 0 0 0
> 0 0 0 0 0 0
> 0 0 0 0 0 0
> 0 0 0 0 0 0
> 0 IO-APIC-edge timer
> 1: 3 0 0 0 0
> 0 0 0 0 0 0
> 0 0 0 0 0 0
> 0 0 0 0 0 0
> 0 IO-APIC-edge i8042
> 8: 1 0 0 0 0
> 0 0 0 0 0 0
> 0 0 0 0 0 0
> 0 0 0 0 0 0
> 0 IO-APIC-edge rtc
> 9: 0 0 0 0 0
> 0 0 0 0 0 0
> 0 0 0 0 0 0
> 0 0 0 0 0 0
> 0 IO-APIC-level acpi
> 12: 4 0 0 0 0
> 0 0 0 0 0 0
> 0 0 0 0 0 0
> 0 0 0 0 0 0
> 0 IO-APIC-edge i8042
> 14: 151 0 0 0 18881
> 0 0 0 0 360 0
> 0 0 0 0 0 0
> 0 0 0 0 0 0
> 0 IO-APIC-edge ide0
> 15: 0 0 0 0 0
> 0 0 0 0 0 0
> 0 0 0 0 0 0
> 0 0 0 0 0 0
> 0 IO-APIC-edge ata_piix
> 170: 54 0 0 0 0
> 0 0 0 0 0 0
> 0 0 0 0 0 0
> 0 0 0 0 0 0
> 0 IO-APIC-level ehci_hcd:usb1
> 177: 6702 0 0 0 0
> 0 0 0 427 0 53
> 0 0 0 0 0 0
> 0 0 0 0 0 0
> 0 IO-APIC-level megasas
> 178: 69 0 0 0 0
> 0 0 0 3 0 0
> 0 0 0 0 0 0
> 0 0 0 0 0 0
> 0 IO-APIC-level uhci_hcd:usb2, uhci_hcd:usb3, uhci_hcd:usb4,
> uhci_hcd:usb5
> 202: 2670 0 0 0 0
> 0 0 0 0 0 0
> 0 0 0 0 0 0
> 0 0 0 0 0 0
> 0 PCI-MSI eth0
> NMI: 1802 123 120 120 123
> 126 120 120 115 119 118
> 115 115 118 116 113 114
> 113 114 113 110 112 110 113
> LOC: 2206644 2206498 2206579 2206476 2206521
> 2206358 2206278 2206181 2206399 2206069 2205980
> 2205890 2205924 2205769 2205691 2205597 2205680
> 2205482 2205389 2205298 2205463 2205181 2205100
> 2205004
> ERR: 0
> MIS: 0
>
>
>
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