# Logstash high cpu usage when idle **URL:** \ **Category:** Logstash\ **Created:** [December 13, 2017, 4:08pm UTC](https://discuss.elastic.co/t/logstash-high-cpu-usage-when-idle/111600 "2017-12-13T16:08:12Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![alexus](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/alexus/32/12696_2.png) [@alexus](https://discuss.elastic.co/u/alexus)\ **Post date:** [December 13, 2017, 4:08pm UTC](https://discuss.elastic.co/t/logstash-high-cpu-usage-when-idle/111600/1 "2017-12-13T16:08:12Z")
I'm running ELK stack: elk & beats: ``` # rpm -q elasticsearch logstash kibana elasticsearch-6.0.1-1.noarch logstash-6.0.1-1.noarch kibana-6.0.1-1.x86_64 # rpm -q filebeat metricbeat filebeat-6.0.1-1.x86_64 metricbeat-6.0.1-1.x86_64 # ``` My environment: ``` # cat /etc/redhat-release Red Hat Enterprise Linux Server release 7.4 (Maipo) # uname -a Linux X 3.10.0-693.5.2.el7.x86_64 #1 SMP Fri Oct 13 10:46:25 EDT 2017 x86_64 x86_64 x86_64 GNU/Linux # ``` and I noticed that my CPU is being utilized: ``` # top -n 1 | head top - 11:01:00 up 3 days, 23:21, 2 users, load average: 4.30, 4.19, 4.21 Tasks: 157 total, 1 running, 156 sleeping, 0 stopped, 0 zombie %Cpu(s): 0.0 us, 3.2 sy, 95.2 ni, 1.6 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem : 8008592 total, 249368 free, 1972212 used, 5787012 buff/cache KiB Swap: 0 total, 0 free, 0 used. 5415744 avail Mem PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 2559 logstash 39 19 2908216 224376 13032 S 362.5 2.8 0:27.85 java 1 root 20 0 193712 6872 4092 S 0.0 0.1 2:09.25 systemd 2 root 20 0 0 0 0 S 0.0 0.0 0:00.08 kthreadd # ``` elasticsearch log: ``` # tail -1 /var/log/elasticsearch/x.log [2017-12-13T10:52:13,947][INFO][o.e.m.j.JvmGcMonitorService] [X] [gc][341727] overhead, spent [340ms] collecting in the last [1s] # ``` My ELK stack is not being super utilized. I did noticed that is CPU that being used is in `nice` CPU, so maybe it's not as bad? Please advise. ---
**Author:** ![alexus](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/alexus/32/12696_2.png) [@alexus](https://discuss.elastic.co/u/alexus)\ **Post date:** [December 13, 2017, 4:31pm UTC](https://discuss.elastic.co/t/logstash-high-cpu-usage-when-idle/111600/2 "2017-12-13T16:31:24Z")
in my case it was related to logstash rather then elasticsearch... after I took a look at /var/log/logstash/logstash-plain.log, I saw logstash had an issue writing to file/directory and that somehow generated this huge overhead with cpu (at least it was nice) after I addressed writing issue and restart logstash, cpu went down and now it's idle: ``` # top -n 1 | head top - 11:30:42 up 3 days, 23:50, 1 user, load average: 0.06, 0.23, 1.46 Tasks: 152 total, 1 running, 151 sleeping, 0 stopped, 0 zombie %Cpu(s): 3.2 us, 1.6 sy, 0.0 ni, 92.1 id, 3.2 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem : 8008592 total, 433696 free, 2055752 used, 5519144 buff/cache KiB Swap: 0 total, 0 free, 0 used. 5332192 avail Mem PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1095 root 20 0 1316972 62472 19240 S 13.3 0.8 27:30.18 dockerd-latest 1 root 20 0 193712 6872 4092 S 0.0 0.1 2:09.75 systemd 2 root 20 0 0 0 0 S 0.0 0.0 0:00.08 kthreadd # ``` ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [January 10, 2018, 4:31pm UTC](https://discuss.elastic.co/t/logstash-high-cpu-usage-when-idle/111600/3 "2018-01-10T16:31:31Z")
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