On Mon, May 17, 2010 at 6:02 PM, Curt Bererton <c...@zipzapplay.com> wrote:
> So pretty much the defaults aside from the 7Gig max heap. CPU is totally > hammered right now, and it is receiving 0 ops/sec from me since I > disconnected it from our application right now until I can figure out what's > going on. > > running top on the machine I get: > top - 18:56:32 up 2 days, 20:57, 2 users, load average: 14.97, 15.24, > 15.13 > Tasks: 87 total, 5 running, 82 sleeping, 0 stopped, 0 zombie > Cpu(s): 40.1%us, 33.9%sy, 0.0%ni, 0.1%id, 0.0%wa, 0.0%hi, 1.3%si, > 24.6%st > Mem: 7872040k total, 3618764k used, 4253276k free, 387536k buffers > Swap: 0k total, 0k used, 0k free, 1655556k cached > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ > COMMAND > 2566 cassandr 25 0 7906m 639m 10m S 150 8.3 5846:35 java > Since your heap isn't anywhere near exhausted, I don't think you have a GC storm happening. Is it one core or both that are pegged? One way to tell which thread is using all the CPU is to run top -H so you can see the threads, get the pid of the one using the CPU, convert that to hex, then run jmap <main java pid> and grep for the hex. -Brandon
