Questions tagged [numa]

Non-Uniform Memory Access is what it stands for. For x86 architectures this is the method used to handle memory architectures where each processor has local memory and accessing another processor's memory is appreciably more expensive.

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Unexpected and unexplained slow (and unusual) memory performance with Xeon Skylake SMP

We've been testing a server using 2x Xeon Gold 6154 CPUs with a Supermicro X11DPH-I motherboard, and 96GB RAM, and found some very strange performance issues surrounding memory when compared to ...
5
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1answer
155 views

Server computational slowdown when RAM is used extensively

I have problem with server slowdowns in very specific scenario. The facts are: 1) I use computational application WRF (Weather Research and Forecast) 2) I use Dual Xeon E5-2620 v3 with 128GB RAM (...
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0answers
1k views

IIS Performance NUMA

I have been struggling with an IIS issue and can't seem to find any answers. Basically here is the setup. I have a Dell Server with 4 processors 10 cores each with hyper-threading enabled. Giving ...
3
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0answers
185 views

Hyper-V 2016 DDA issue: a VM boot fails when a drive is connected to an opposite NUMA node

Brief description: the host is Windows Server 2016 Datacenter Build 14393 (UEFI) running Hyper-V role. SR-IOV and Intel VT are enabled. 4x Intel® Optane ™ SSD 900P 280GB PCIe NVMe 3.0 drives are ...
3
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0answers
788 views

Kernel parameter isolcpus seems to have no effect on Ubuntu Server with NUMA

I use the isolcpus kernel parameter to restrict the CPUs the Linux scheduler should use to place processes. cat /proc/cmdline BOOT_IMAGE=/boot/vmlinuz-4.2.0-18-generic.efi.signed root=UUID=78e5b46f-...
3
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0answers
566 views

Move process across NUMA system

I am running many multi-threaded processes on a larger NUMA system with dozens of sockets. The memory access across different nodes is very slow, so I restrict each process to one socket and let it ...
2
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0answers
10 views

Slurm - Does it maintain ccNUMA?

Does a SLURM cluster control, maintain or enforce Cache Coherence across the Nodes? Is it a configuration property, or does something like this not exist? I can't find anything inside the docs.
2
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2answers
1k views

NUMA placement failed, performance might be affected

I'm running SuperMicro 6048R-E1CR36H Storageserver on Ubuntu Xenial 16.04.03 LTS and Xen Kernel: 4.4.0-97-generic Xen: xen-hypervisor-4.6-amd64:amd64/xenial-security 4.6.5-0ubuntu1.2 Problem: when ...
2
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0answers
73 views

find out NUMA locality of process RAM

I am doing an application benchmark with multiple instances of the same application. I found out that pinning their processes (with sched_setaffinity under Linux, with TaskManager under Windows) to ...
2
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1answer
506 views

NUMA node interleaving doesn't work for MariaDB

Please help activating NUMA node interleaving for MariaDB. Using MariaDB 10.1.21 on CentOS Linux release 7.3.1611. Per instructions on https://mariadb.com/kb/en/mariadb/systemd/ added /etc/systemd/...
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0answers
223 views

openstack shared PCI between numa with SR-IOV

I'm building SR-IOV supported compute node on HP 360g8 hardware and i have Qlogic interface card, my compute node has 32 core & 32GB memory. Problem: when i launch vm-1 (with flavor 16 vCPU core)...
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0answers
76 views

Bad performance on better hardware

I have postgresql streaming replication on 2 hosts and I've faced with the problem of different performance compared between two servers. It looks like all sql queries on one host are slower on 70-90% ...
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0answers
695 views

Memcpy bandwidth ~1.6x faster on 1 vs 2 socket Intel Scalable (Skylake)?

I'm in the process of porting a complex performance oriented application to run on a new dual socket machine. I encountered some performance anomalies while doing so and, after much experimentation, ...
1
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0answers
61 views

Writing a Numa load balancer

I originally asked this question on StackOverflow, but as there came no answers, and this question is more about how to configure a server, this question might be more suited on ServerFault. I have ...
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0answers
325 views

NUMA - all CPU's bound to node 0

I am running Dell PE 815 servers with two 16-core Opteron's, with four memory modules on each, OS - RHEL6, when I've started optimizing it for NUMA operation, found, that all cores are shown as bound ...
1
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0answers
408 views

NUMA enabled but can't detect node

I have a Centos 6.4 (kernel 2.6.32) machine with 2x Intel X5670 (Westmere) in a SuperMicro X8DTG-D motherboard with 2.0a BIOS version. BIOS Settings for ACPI are: ACPI Aware O/S: Enabled APCI ...
0
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0answers
24 views

How do I create NUMA nodes on Windows 2008

I have a VM with 8 logical processors. I want to set up different NUMA nodes to test some things, performance doesn't matter. How do I go about doing this or is there any documentation/instructions I ...
0
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0answers
56 views

Linux NFS server NUMA affinity - pool_mode

From the Linux kernel-parameters.txt I have seen that it is possible to change the NFS pool behaviour to have the nfsd threads bound to NUMA zones. The parameter in question is sunrpc.pool_mode and ...
0
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0answers
195 views

CPU & Memory Reservation in vSphere & Numa concept

by googling/studying vSphere documentation I have found the possibility to use "Reservation" concept in vSphere. What it is not clear to me is : CPU and Memory reservations are configured separately ...
0
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1answer
70 views

NUMA processor definition

NUMA, non-uniform memory access designates a symetric multi-processing system where processors are grouped into nodes, with each group sharing some level of memory, so that memory access on same node ...
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2answers
1k views

Hyper-V NUMA setting

My machine is running on Window 2012 R2, with 48 Logical processors and 240GB RAM. I have create a VM with 48 processors and 230GB ram. I am double about the NUMA nodes I should create and memory ...