PrabhuJoseph commented on code in PR #4501: URL: https://github.com/apache/hadoop/pull/4501#discussion_r906998030
########## hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/markdown/UsingNuma.md: ########## @@ -0,0 +1,180 @@ +<!--- + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. See accompanying LICENSE file. +--> + +# NUMA + +Non-uniform memory access (NUMA) is a computer memory design used in multiprocessing, +where the memory access time depends on the memory location relative to the processor. +Under NUMA, a processor can access its own local memory faster than non-local memory +(memory local to another processor or memory shared between processors). +Yarn Containers can make benefit of this NUMA design to get better performance by binding to a +specific NUMA node and all subsequent memory allocations will be served by the same node, +reducing remote memory accesses. Review Comment: Can we also mention that NUMA support for YARN Container has to be enabled only if worker node machines has NUMA support. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
