On Oct 16, 2011, at 1:44pm, Rob Brown wrote: > Looks like I checked the load during a quiet period, ab -n 10000 -c 1000 > saw a decent 40% load on each core. > > Still a little confused as to why 1 core stays at 100% constantly - even > during the quiet periods?
Could be background GC, depending on what you've got your JVM configured to use. Though that shouldn't stay at 100% for very long. -- Ken > -----Original Message----- > From: Johannes Goll <johannes.g...@gmail.com> > Reply-to: solr-user@lucene.apache.org > To: solr-user@lucene.apache.org <solr-user@lucene.apache.org> > Subject: Re: Multi CPU Cores > Date: Sat, 15 Oct 2011 21:30:11 -0400 > > Did you try to submit multiple search requests in parallel? The apache ab > tool is great tool to simulate simultaneous load using (-n and -c). > Johannes > > On Oct 15, 2011, at 7:32 PM, Rob Brown <r...@intelcompute.com> wrote: > >> Hi, >> >> I'm running Solr on a machine with 16 CPU cores, yet watching "top" >> shows that java is only apparently using 1 and maxing it out. >> >> Is there anything that can be done to take advantage of more CPU cores? >> >> Solr 3.4 under Tomcat >> >> [root@solr01 ~]# java -version >> java version "1.6.0_20" >> OpenJDK Runtime Environment (IcedTea6 1.9.8) >> (rhel-1.22.1.9.8.el5_6-x86_64) >> OpenJDK 64-Bit Server VM (build 19.0-b09, mixed mode) >> >> >> top - 14:36:18 up 22 days, 21:54, 4 users, load average: 1.89, 1.24, >> 1.08 >> Tasks: 317 total, 1 running, 315 sleeping, 0 stopped, 1 zombie >> Cpu0 : 0.0%us, 0.0%sy, 0.0%ni, 99.6%id, 0.4%wa, 0.0%hi, 0.0%si, >> 0.0%st >> Cpu1 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, >> 0.0%st >> Cpu2 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, >> 0.0%st >> Cpu3 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, >> 0.0%st >> Cpu4 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, >> 0.0%st >> Cpu5 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, >> 0.0%st >> Cpu6 : 99.6%us, 0.4%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, >> 0.0%st >> Cpu7 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, >> 0.0%st >> Cpu8 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, >> 0.0%st >> Cpu9 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, >> 0.0%st >> Cpu10 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, >> 0.0%st >> Cpu11 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, >> 0.0%st >> Cpu12 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, >> 0.0%st >> Cpu13 : 0.7%us, 0.0%sy, 0.0%ni, 99.3%id, 0.0%wa, 0.0%hi, 0.0%si, >> 0.0%st >> Cpu14 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, >> 0.0%st >> Cpu15 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, >> 0.0%st >> Mem: 132088928k total, 23760584k used, 108328344k free, 318228k >> buffers >> Swap: 25920868k total, 0k used, 25920868k free, 18371128k cached >> >> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ >> COMMAND >> >> >> 4466 tomcat 20 0 31.2g 4.0g 171m S 101.0 3.2 2909:38 >> java >> >> >> 6495 root 15 0 42416 3892 1740 S 0.4 0.0 9:34.71 >> openvpn >> >> >> 11456 root 16 0 12892 1312 836 R 0.4 0.0 0:00.08 >> top >> >> >> 1 root 15 0 10368 632 536 S 0.0 0.0 0:04.69 >> init >> >> >> > -------------------------- Ken Krugler +1 530-210-6378 http://bixolabs.com custom big data solutions & training Hadoop, Cascading, Mahout & Solr
