From: "Amit K. Arora" <aarora@linux.vnet.ibm.com>
To: linux-numa@vger.kernel.org
Cc: aarora@linux.vnet.ibm.com
Subject: [PATCH 0/2] non-contiguous NUMA nodes handling in numactl and libnuma
Date: Mon, 2 Mar 2009 18:35:46 +0530 [thread overview]
Message-ID: <20090302130546.GA31167@amitarora.in.ibm.com> (raw)
PROBLEM: If the NUMA nodes in a system are not contiguous, numactl shows
incorrect output. Here is an example from one such system:
------------------------------------------------------
# ls /sys/devices/system/node
has_cpu has_normal_memory node0 node1 node4 node5 online possible
# numactl --hardware
available: 6 nodes (0-5)
node 0 cpus: 0 1 2 3
node 0 size: 15232 MB
node 0 free: 2265 MB
node 1 cpus: 4 5 6 7
node 1 size: 16256 MB
node 1 free: 3108 MB
libnuma: Warning: /sys not mounted or invalid. Assuming one node: No
such file or directory
node 2 cpus:
node 2 size: <not available>
node 2 free: <not available>
node 3 cpus:
node 3 size: <not available>
node 3 free: <not available>
node 4 cpus: 8 9 10 11
node 4 size: 16000 MB
node 4 free: 9292 MB
node 5 cpus: 12 13 14 15
node 5 size: 16128 MB
node 5 free: 9479 MB
node distances:
node 0 1 2 3 4 5
0: 10 20 20 20 20 10
1: 20 10 20 20 0 0
2: 0 0 0 0 0 0
3: 0 0 0 0 0 0
4: 0 0 0 1112145 1024 2607344
5: 1024 2607344 1024 2607344 0 0
------------------------------------------------------
As we see above, there are three problems with above output:
o it is showing wrong number of available nodes
Actually there are 4 nodes available, but it says "6".
o it tries to access information for non-exsistent nodes from /sys
Thus displaying a wrong warning message too
o the NUMA distances it shows above are clearly incorrect.
Following two patches fixes these problems:
1) numactl-handle-NUMA-dist-properly.patch
2) numactl-ignore-nonavailable-nodes.patch
--
Regards,
Amit Arora
next reply other threads:[~2009-03-02 13:05 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-02 13:05 Amit K. Arora [this message]
2009-03-02 13:19 ` [PATCH 1/2] handle NUMA distances properly for non-contiguous nodes Amit K. Arora
2009-03-02 13:23 ` [PATCH 2/2] ignore unavailable NUMA nodes Amit K. Arora
2009-03-02 13:27 ` Results after applying the patch Amit K. Arora
2009-03-02 13:58 ` [PATCH 0/2] non-contiguous NUMA nodes handling in numactl and libnuma Cliff Wickman
2009-03-09 13:17 ` [PATCH] distance table for non-contiguous NUMA nodes Amit K. Arora
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