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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4 votes
3 answers
1k views

HP DL360p with Intel E5-2630 NUMA Capable?

I couldn't find any information via search to determine this via the Intel or HP website. Can you enable NUMA nodes on this? How can you tell the side of each node if so? Is it always best practice to ...
Untalented's user avatar
36 votes
1 answer
4k views

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 ...
Marc Micalizzi's user avatar
7 votes
2 answers
9k views

NUMA CPU numbering in Linux

I have access to two NUMA servers. One of them is Dell R720 and has these CPUs: $ cat /proc/cpuinfo |grep Xeon|sort|uniq -c 24 model name : Intel(R) Xeon(R) CPU E5-2630L v2 @ 2.40GHz The other ...
juhist's user avatar
  • 322
3 votes
1 answer
10k views

How can I tell if NUMA is enabled on a MongoDB server?

Our mongodb process is consistently using >100% of our CPU (this is on an Ubuntu 64-bit server on Linode) and we're casting about for performance improvements. One suggestion we found was that ...
dreeves's user avatar
  • 238
2 votes
0 answers
404 views

Current single system image solutions

I'm designing a cluster for a small research institute. Since our computations require a large amount of memory, I'm looking for a solution that will allow our applications access to the whole memory ...
Piotr M's user avatar
  • 33
2 votes
1 answer
1k views

Linux Opteron system appears to be UMA but should be NUMA

According to numactl, this dual CPU Opteron box is UMA rather than the expected NUMA: $ numactl --hardware available: 1 nodes (0) node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 node 0 size: 65534 ...
Wayne Conrad's user avatar
0 votes
1 answer
307 views

Incorrect # of Free Hugepages in `numastat`

$ numastat -vm Per-node system memory usage (in MBs): Node 0 Total --------------- --------------- MemTotal 32464.24 32464....
HCSF's user avatar
  • 245