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Hi Laura,<br>
<br>
<div class="moz-cite-prefix">On 30.01.2014 16:55, Baxter, Laura
wrote:<br>
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<div><span style="background-color:rgb(255,255,255)">Hi,</span>
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<div style="background-color:rgb(255,255,255)">I'm running
VirtualBox version 4.3.6 r91406. </div>
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<div style="background-color:rgb(255,255,255)">The basic
problem I am having is that although my (Linux) server
has 64 CPUs, (4 nodes each with 16 CPUs/8cores with 2
threads per core), my VM is only allowing me to set 8
processors (max).</div>
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VirtualBox can definitely deal with multi-socket systems (has been
tested on 8 socket systems with 10 cores with 2 threads per core),
so we need to get a bit more detail about the reality (the output of
"cat /dev/cpuinfo") and what VirtualBox thinks (the output of
"VBoxManage list hostinfo"), as the combination will give us a lot
of hints what information might be wrong. lscpu is a very useful
command to get a quick overview, but we need the lower level
details. Actually the lscpu output you provided somewhat contradicts
your claims above, you have a system with 8 nodes with 8 cores each
- AMD doesn't do hyperthreading.<br>
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<div style="background-color:rgb(255,255,255)">My question
is, how can i get my VM to "see" all 64 nodes, to
increase the VM's processing power?</div>
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Careful with the assumption "more VCPUs = faster VM" - even if the
workload on real hardware scales very well, it might be different in
a VM, as the I/O overhead is much higher, and the cross-VCPU
synchronization can be extremely expensive.<br>
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<div style="background-color:rgb(255,255,255)">Is this an
issue with NUMA not being supported/implemented?</div>
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NUMA as such isn't supported (as far as optimizing memory placement
is concerned), but VirtualBox should definitely be able to use all
CPUs and the entire memory.<br>
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<div style="background-color:rgb(255,255,255)">Below are
some details of the VM and the server, I hope someone
has some ideas to help, i wonder if this issue affects
other users?</div>
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We should be able to figure out what's going on... it's definitely
not affecting everyone (and as you're using Linux it's definitely
not the issue that modern Windows versions pretend that AMD does
hyperthreading, assuming that the CPUs in the systems are actually
threads, and that the core count is half the thread count).<br>
<br>
Klaus<br>
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<div style="background-color:rgb(255,255,255)">Many
thanks,</div>
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<div style="background-color:rgb(255,255,255)">Laura</div>
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