On 12/02/2013 00:42, Reindl Harald wrote:
Am 12.02.2013 01:17, schrieb Robert Moskowitz:
On 02/11/2013 06:07 PM, Reindl Harald wrote:
Am 11.02.2013 23:43, schrieb Robert Moskowitz:
Do I have this right?
since on a duo core system, /proc/cpuinfo reports both cores and a bogomips number for each, that number is the
value for a core. Thus 'in theory' the bogomips for the unit is the sum of the two values (the same in every duo
core I have seen)
practically i would say this value is hmm useless
is it hardcoded in the CPU?
is it measured?
if it is measured at which moment of time
which stepping had the CPU at the moment :-)
I realize it is rather relative, but it helps me keep my various systems classified, like system 1 is probably
twice the speed of system 2 (given same # of cores and memory)
not really :-)
home machine (16 GB)
model name: Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz
bogomips: 6784.31
production VMware guest (10 GB)
model name : Intel(R) Xeon(R) CPU E5-2640 0 @ 2.50GHz
bogomips : 4987.50
under real load the XEON is so much faster even
with the virualization overhead which is small
these days but still exists
Small as in un-noticeable if your VMs are largely idling. Not that small
if you intend to push the hardware to it's actual limits. On a Core2
class machine, the best hypervisors manage to do it with about a 25%
performance drop. Many do worse.
http://www.altechnative.net/2012/08/04/virtual-performance-part-1-vmware/
i have seen the XEON machine with a Load of 140 while a massive DDOS was running
with ten thousands of connections and 100Mbit incoming traffic from always the
same request on a mysql-driven website and ssh/lsof/ps aux was as fast as it would
be idle, on the home-machine with a load over 40 you are done
It's not that clear cut - it depends on where the DOS bottlenecks the
system. If you have a web server being DOS-ed and it's waiting for
responses from MySQL which is on a different server, then yes, you'll
have a very high load and very low CPU usage since most of the httpds
are waiting for a response from the DB. Since CPU usage is low, the
machine itself will be very responsive if you ssh into it. The web
response, may well not be.
Gordan
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