# Hyper-Threading **URL:** \ **Category:** Elasticsearch\ **Created:** [July 18, 2014, 7:57pm UTC](https://discuss.elastic.co/t/hyper-threading/18743 "2014-07-18T19:57:11Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![nik9000](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/nik9000/32/44947_2.png) [@nik9000](https://discuss.elastic.co/u/nik9000)\ **Post date:** [July 18, 2014, 7:57pm UTC](https://discuss.elastic.co/t/hyper-threading/18743/1 "2014-07-18T19:57:11Z")
Does hyper threading help Elasticsearch/Lucene? I'm looking for an answer like: Never Always Depends on workload Doesn't hurt Thanks! Nik -- 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 [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CAPmjWd05Rf6\_fJfz8YohXRvJNmREtCx6wGwikYdgHobqJMfKPA%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAPmjWd05Rf6_fJfz8YohXRvJNmREtCx6wGwikYdgHobqJMfKPA%40mail.gmail.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![jprante](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jprante/32/44941_2.png) [@jprante](https://discuss.elastic.co/u/jprante)\ **Post date:** [July 18, 2014, 8:34pm UTC](https://discuss.elastic.co/t/hyper-threading/18743/2 "2014-07-18T20:34:52Z")
Always. Elasticsearch makes heavy use of threading. A Java thread must be mapped to an execution pipeline in the CPU. The more Java threads an application creates, the more resources the CPU must provide. The "hyperthreading" feature of Intel CPUs is a core with two execution pipelines instead of one. So, for thread pooling, it helps to manage Java threading more efficiently. (In reality, it also depends on the compiler that was used for building the JVM, if the compiler can not exploit the power of CPU features like hyperthreading, it is useless for Java) Jörg On Fri, Jul 18, 2014 at 9:57 PM, Nikolas Everett [nik9000@gmail.com](mailto:nik9000@gmail.com) wrote: > Does hyper threading help Elasticsearch/Lucene? I'm looking for an answer > like: > Never > Always > Depends on workload > Doesn't hurt > > Thanks! > > Nik > > -- > 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 [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > To view this discussion on the web visit > [https://groups.google.com/d/msgid/elasticsearch/CAPmjWd05Rf6\_fJfz8YohXRvJNmREtCx6wGwikYdgHobqJMfKPA%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAPmjWd05Rf6_fJfz8YohXRvJNmREtCx6wGwikYdgHobqJMfKPA%40mail.gmail.com) > [https://groups.google.com/d/msgid/elasticsearch/CAPmjWd05Rf6\_fJfz8YohXRvJNmREtCx6wGwikYdgHobqJMfKPA%40mail.gmail.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/CAPmjWd05Rf6_fJfz8YohXRvJNmREtCx6wGwikYdgHobqJMfKPA%40mail.gmail.com?utm_medium=email&utm_source=footer) > . > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). -- 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 [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoFX26bXqRbTEK6mQ%2BLLuB1ELkGNSTO5O9cXfUrXc9UBNQ%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoFX26bXqRbTEK6mQ%2BLLuB1ELkGNSTO5O9cXfUrXc9UBNQ%40mail.gmail.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![Itamar\_Syn\_Hershko](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/itamar_syn_hershko/32/725_2.png) [@Itamar\_Syn\_Hershko](https://discuss.elastic.co/u/Itamar_Syn_Hershko)\ **Post date:** [July 20, 2014, 10:01am UTC](https://discuss.elastic.co/t/hyper-threading/18743/3 "2014-07-20T10:01:02Z")
It would also depends on the caching abilities and that the currently paralelized threads are not sharing a resource. In the end, like with all Computer Science stuff, the answer is "it depends" 🙂 -- Itamar Syn-Hershko [http://code972.com](http://code972.com) | @synhershko [https://twitter.com/synhershko](https://twitter.com/synhershko) Freelance Developer & Consultant Author of RavenDB in Action [http://manning.com/synhershko/](http://manning.com/synhershko/) On Fri, Jul 18, 2014 at 11:34 PM, [joergprante@gmail.com](mailto:joergprante@gmail.com) \< [joergprante@gmail.com](mailto:joergprante@gmail.com)\> wrote: > Always. > > Elasticsearch makes heavy use of threading. A Java thread must be mapped > to an execution pipeline in the CPU. The more Java threads an application > creates, the more resources the CPU must provide. The "hyperthreading" > feature of Intel CPUs is a core with two execution pipelines instead of > one. So, for thread pooling, it helps to manage Java threading more > efficiently. (In reality, it also depends on the compiler that was used for > building the JVM, if the compiler can not exploit the power of CPU features > like hyperthreading, it is useless for Java) > > Jörg > > On Fri, Jul 18, 2014 at 9:57 PM, Nikolas Everett [nik9000@gmail.com](mailto:nik9000@gmail.com) > wrote: > > > Does hyper threading help Elasticsearch/Lucene? I'm looking for an > > answer like: > > Never > > Always > > Depends on workload > > Doesn't hurt > > > > Thanks! > > > > Nik > > > > -- > > 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 [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > > To view this discussion on the web visit > > [https://groups.google.com/d/msgid/elasticsearch/CAPmjWd05Rf6\_fJfz8YohXRvJNmREtCx6wGwikYdgHobqJMfKPA%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAPmjWd05Rf6_fJfz8YohXRvJNmREtCx6wGwikYdgHobqJMfKPA%40mail.gmail.com) > > [https://groups.google.com/d/msgid/elasticsearch/CAPmjWd05Rf6\_fJfz8YohXRvJNmREtCx6wGwikYdgHobqJMfKPA%40mail.gmail.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/CAPmjWd05Rf6_fJfz8YohXRvJNmREtCx6wGwikYdgHobqJMfKPA%40mail.gmail.com?utm_medium=email&utm_source=footer) > > . > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). > > -- > 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 [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > To view this discussion on the web visit > [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoFX26bXqRbTEK6mQ%2BLLuB1ELkGNSTO5O9cXfUrXc9UBNQ%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoFX26bXqRbTEK6mQ%2BLLuB1ELkGNSTO5O9cXfUrXc9UBNQ%40mail.gmail.com) > [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoFX26bXqRbTEK6mQ%2BLLuB1ELkGNSTO5O9cXfUrXc9UBNQ%40mail.gmail.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoFX26bXqRbTEK6mQ%2BLLuB1ELkGNSTO5O9cXfUrXc9UBNQ%40mail.gmail.com?utm_medium=email&utm_source=footer) > . > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). -- 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 [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CAHTr4ZuE0QsaGOcwvUS13%2B\_nZfk%2BD6Y%2BeQcnC6%3D-YMo3x8v5Qw%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAHTr4ZuE0QsaGOcwvUS13%2B_nZfk%2BD6Y%2BeQcnC6%3D-YMo3x8v5Qw%40mail.gmail.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 1:14am UTC](https://discuss.elastic.co/t/hyper-threading/18743/4 "2017-07-06T01:14:41Z")