# Multi-core support for elasticsearch **URL:** \ **Category:** Elasticsearch\ **Created:** [October 23, 2013, 2:53pm UTC](https://discuss.elastic.co/t/multi-core-support-for-elasticsearch/14073 "2013-10-23T14:53:47Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Ashish\_Nigam\_3](https://avatars.discourse-cdn.com/v4/letter/a/f19dbf/32.png) [@Ashish\_Nigam\_3](https://discuss.elastic.co/u/Ashish_Nigam_3)\ **Post date:** [October 23, 2013, 2:53pm UTC](https://discuss.elastic.co/t/multi-core-support-for-elasticsearch/14073/1 "2013-10-23T14:53:47Z")
I have been using 0.19.8 version for last 1+ year. For last two weeks, I have been running into lot of stability issues with the cluster - unassigned shards, CPU \> 100% etc. I am planning to migrate to latest ES version soon. But I have to support this version for few more weeks. I noticed that ES java process is only using one core, even though ES node has 6 cores. Did 0.19.8 version process runs only one core? If not, how can I enable ES process to use multi-core? Thanks Ashish -- 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). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**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:** [October 23, 2013, 3:23pm UTC](https://discuss.elastic.co/t/multi-core-support-for-elasticsearch/14073/2 "2013-10-23T15:23:29Z")
ES is by default using all available CPU cores. If you see Java consuming a single thread and goes up to 100% without going low again, you have an issue. Which OS are you running and how much resources (CPU, Memory) have you allocated to ES? Jörg -- 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). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![Alexander\_Petrovsky](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/alexander_petrovsky/32/832_2.png) [@Alexander\_Petrovsky](https://discuss.elastic.co/u/Alexander_Petrovsky)\ **Post date:** [March 13, 2015, 11:39am UTC](https://discuss.elastic.co/t/multi-core-support-for-elasticsearch/14073/3 "2015-03-13T11:39:26Z")
Hi! I have the same problem on my singe elasticsearch instance. # dpkg -l | grep elas ii elasticsearch 1.4.2 all Open Source, Distributed, RESTful Search Engine # uname -a Linux [s2322.serverel.net](http://s2322.serverel.net) 3.2.0-4-amd64 #1 SMP Debian 3.2.63-2+deb7u2 x86\_64 GNU/Linux # top Tasks: 98 total, 2 running, 96 sleeping, 0 stopped, 0 zombie %Cpu(s): 19.2 us, 5.8 sy, 0.9 ni, 74.0 id, 0.1 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem: 8178012 total, 6844332 used, 1333680 free, 190952 buffers KiB Swap: 8000508 total, 0 used, 8000508 free, 5040912 cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 23694 elastics 20 0 23740 3872 1080 R 100.2 0.0 517:24.56 core 50459 logstash 39 19 1019m 238m 15m S 3.7 3.0 1:36.33 java htop show me only one core consumption. Can you help me? среда, 23 октября 2013 г., 15:53:47 UTC+1 пользователь Ashish Nigam написал: > I have been using 0.19.8 version for last 1+ year. For last two weeks, I > have been running into lot of stability issues with the cluster - > unassigned shards, CPU \> 100% etc. I am planning to migrate to latest ES > version soon. But I have to support this version for few more weeks. > > I noticed that ES java process is only using one core, even though ES node > has 6 cores. > Did 0.19.8 version process runs only one core? > If not, how can I enable ES process to use multi-core? > > Thanks > Ashish -- 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/02254b17-69c0-4c09-82c6-48c06919cf78%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/02254b17-69c0-4c09-82c6-48c06919cf78%40googlegroups.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![Alexander\_Petrovsky](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/alexander_petrovsky/32/832_2.png) [@Alexander\_Petrovsky](https://discuss.elastic.co/u/Alexander_Petrovsky)\ **Post date:** [March 13, 2015, 11:40am UTC](https://discuss.elastic.co/t/multi-core-support-for-elasticsearch/14073/4 "2015-03-13T11:40:30Z")
Hi! I have the same problem on my singe elasticsearch instance. # dpkg -l | grep elas ii elasticsearch 1.4.2 all Open Source, Distributed, RESTful Search Engine # uname -a Linux .... 3.2.0-4-amd64 #1 SMP Debian 3.2.63-2+deb7u2 x86\_64 GNU/Linux # top Tasks: 98 total, 2 running, 96 sleeping, 0 stopped, 0 zombie %Cpu(s): 19.2 us, 5.8 sy, 0.9 ni, 74.0 id, 0.1 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem: 8178012 total, 6844332 used, 1333680 free, 190952 buffers KiB Swap: 8000508 total, 0 used, 8000508 free, 5040912 cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 23694 elastics 20 0 23740 3872 1080 R 100.2 0.0 517:24.56 core 50459 logstash 39 19 1019m 238m 15m S 3.7 3.0 1:36.33 java htop show me only one core consumption. Can you help me? среда, 23 октября 2013 г., 15:53:47 UTC+1 пользователь Ashish Nigam написал: > I have been using 0.19.8 version for last 1+ year. For last two weeks, I > have been running into lot of stability issues with the cluster - > unassigned shards, CPU \> 100% etc. I am planning to migrate to latest ES > version soon. But I have to support this version for few more weeks. > > I noticed that ES java process is only using one core, even though ES node > has 6 cores. > Did 0.19.8 version process runs only one core? > If not, how can I enable ES process to use multi-core? > > Thanks > Ashish -- 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/51a2808e-44bb-4740-9c72-c63eb15c06d5%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/51a2808e-44bb-4740-9c72-c63eb15c06d5%40googlegroups.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:** [March 13, 2015, 1:11pm UTC](https://discuss.elastic.co/t/multi-core-support-for-elasticsearch/14073/5 "2015-03-13T13:11:08Z")
How do you observe there is "only one core"? Elastisearch uses many threads by default and as many cores as possible. Jörg On Fri, Mar 13, 2015 at 12:40 PM, Alexander Petrovsky [askjuise@gmail.com](mailto:askjuise@gmail.com) wrote: > Hi! > > I have the same problem on my singe elasticsearch instance. > > # dpkg -l | grep elas > > ii elasticsearch 1.4.2 all > Open Source, Distributed, RESTful Search Engine > > # uname -a > > Linux .... 3.2.0-4-amd64 #1 SMP Debian 3.2.63-2+deb7u2 x86\_64 GNU/Linux > > # top > > Tasks: 98 total, 2 running, 96 sleeping, 0 stopped, 0 zombie > %Cpu(s): 19.2 us, 5.8 sy, 0.9 ni, 74.0 id, 0.1 wa, 0.0 hi, 0.0 si, > 0.0 st > KiB Mem: 8178012 total, 6844332 used, 1333680 free, 190952 buffers > KiB Swap: 8000508 total, 0 used, 8000508 free, 5040912 cached > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > > 23694 elastics 20 0 23740 3872 1080 R 100.2 0.0 517:24.56 core > > 50459 logstash 39 19 1019m 238m 15m S 3.7 3.0 1:36.33 java > > htop show me only one core consumption. > > Can you help me? > > среда, 23 октября 2013 г., 15:53:47 UTC+1 пользователь Ashish Nigam > написал: > > > I have been using 0.19.8 version for last 1+ year. For last two weeks, I > > have been running into lot of stability issues with the cluster - > > unassigned shards, CPU \> 100% etc. I am planning to migrate to latest ES > > version soon. But I have to support this version for few more weeks. > > > > I noticed that ES java process is only using one core, even though ES > > node has 6 cores. > > Did 0.19.8 version process runs only one core? > > If not, how can I enable ES process to use multi-core? > > > > Thanks > > Ashish > > > > -- > > 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/51a2808e-44bb-4740-9c72-c63eb15c06d5%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/51a2808e-44bb-4740-9c72-c63eb15c06d5%40googlegroups.com) > > [https://groups.google.com/d/msgid/elasticsearch/51a2808e-44bb-4740-9c72-c63eb15c06d5%40googlegroups.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/51a2808e-44bb-4740-9c72-c63eb15c06d5%40googlegroups.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/CAKdsXoHW%2BWoe6SMHXyDk%2BZvURk0xCpakOGHBrEPp3\_bTHFLLAQ%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoHW%2BWoe6SMHXyDk%2BZvURk0xCpakOGHBrEPp3_bTHFLLAQ%40mail.gmail.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![Aaron\_Mefford](https://avatars.discourse-cdn.com/v4/letter/a/f0a364/32.png) [@Aaron\_Mefford](https://discuss.elastic.co/u/Aaron_Mefford)\ **Post date:** [March 13, 2015, 5:48pm UTC](https://discuss.elastic.co/t/multi-core-support-for-elasticsearch/14073/6 "2015-03-13T17:48:31Z")
I saw this kind of behavior with some older versions of Java, but I mean old, not something I would expect to run ES, but then again your on an old build of ES so I thought I would mention it. > > -- 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/0d7720ea-9c00-4360-92a2-2a169a2b6497%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/0d7720ea-9c00-4360-92a2-2a169a2b6497%40googlegroups.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, 12:26am UTC](https://discuss.elastic.co/t/multi-core-support-for-elasticsearch/14073/7 "2017-07-06T00:26:55Z")