for indexing, your can make use of multi cores easily by call IndexWriter.addDocument with multi-threads as far as I know, for searching, if there is only one request, you can't make good use of cpus.
On Sat, Oct 15, 2011 at 9:37 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 > >
