Ok, I now understand mlockall. But I'm not asking this question in the context of a memory contrived node; my production nodes have 32G ram; I used this setting in order to prevent OOM of prodution nodes.
I may misunderstood the informations a gathered from the web, but I deduced that with the following config params : bootstrap.mlockall: true index.fielddata.cache: node indices.fielddata.cache.size: 40% I would have better control of the memory usage of ES nodes. I still don't understand though, why a node started with -Xms256m -Xmx256 + mlockall: false only take 80M ram while a node started with -Xms256m -Xmx256 + mlockall: true take 600M. On Thu, Jan 30, 2014 at 1:34 AM, [email protected] < [email protected]> wrote: > The JVM uses reserved memory, buffers, and stacks beside the heap, most > can not be controlled by user settings. > To reduce memory as much as possible for a Java process, do not use > mlockall tricks, use 32bit JVM and reduce maximum allowed stack size with > -Xss (this will affect performance of course) > > You will also need many tweaks of Elasticsearch default settings to behave > under shrinked memory, for index loading, field caches, etc. > > Jörg > > -- > You received this message because you are subscribed to a topic in the > Google Groups "elasticsearch" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/elasticsearch/DijPr5PNTYM/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/elasticsearch/CAKdsXoFkHRUsTt-0s7vV_%2BCNL%2BdUW-erVS4JF_OiL%2B4h-X4mXg%40mail.gmail.com > . > > For more options, visit https://groups.google.com/groups/opt_out. > -- -- Arnaud Briche Développeur web / Préstataire de service informatique -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/elasticsearch/CADP2VkAD14qs0_dV7%2BgtaSOrBR3o0rJBWcc-xsyrHH%3DAHXp8cA%40mail.gmail.com. For more options, visit https://groups.google.com/groups/opt_out.
