Hi Peter I actually checked after 15-20 of observation of monitor and logs when everything calmed down then it was showing this many processes, shouldnt it be good to reduce the no. of threads once server is idle or almost idle. As I am not a Java guy the only thing that I can think of is that may be creating processes/threads again will consume more memory than having idle threads.
Regards Vineet Daniel Cell : +918106217121 Websites : Blog <http://vinetedaniel.blogspot.com> | Linkedin<http://in.linkedin.com/in/vineetdaniel> | Twitter <https://twitter.com/vineetdaniel> On Sat, Sep 18, 2010 at 10:50 PM, Peter Schuller < peter.schul...@infidyne.com> wrote: > > Even I would like to add here something and correct me if I am wrong, I > > downloaded 0.7 beta and ran it, just by chance I checked 'top' to see how > > the new version is doing and there were 64 processes running though > > Cassandra was on single node with default configuration options ( ran it > as > > is, as soon as I downloaded). No inserts done, no selects done nothing. I > > don't think this is normal. > > I presume those are threads. It adds up; various stages have multiple > threads in cassandra, and the JVM itself has a number of threads (e.g. > GC threads, compiler threads). A 'jstack' on a freshly started trunk > cassandra for me, grepping for 'prio', yields 92 threads the > following. > > "Attach Listener" daemon prio=9 tid=0x0000000805476800 nid=0x80554e3c0 > waiting on condition [0x0000000000000000] > "Timer-1" prio=5 tid=0x00000009103ed800 nid=0x910777280 in > Object.wait() [0x00007ffffa1a4000] > "LB-TARGET:1" prio=5 tid=0x00000009103ee800 nid=0x910777b40 waiting on > condition [0x00007ffffa2a5000] > "LB-OPERATIONS:1" prio=5 tid=0x00000009103f0000 nid=0x910778400 > waiting on condition [0x00007ffffa3a6000] > "ACCEPT-localhost/127.0.0.1" prio=5 tid=0x00000009103f0800 > nid=0x910778cc0 runnable [0x00007ffffa4a7000] > "Timer-0" prio=5 tid=0x00000009103f1800 nid=0x9103d4ac0 in > Object.wait() [0x00007ffffa5a8000] > "GC inspection" prio=5 tid=0x00000009103f2000 nid=0x91051c540 in > Object.wait() [0x00007ffffa6a9000] > "CompactionExecutor:1" prio=1 tid=0x0000000911805800 nid=0x9111fb3c0 > waiting on condition [0x00007ffffa7aa000] > "PERIODIC-COMMIT-LOG-SYNCER" prio=5 tid=0x00000009103f3000 > nid=0x91051ce00 waiting on condition [0x00007ffffa8ab000] > "COMMIT-LOG-WRITER" prio=5 tid=0x00000009103f3800 nid=0x91051d6c0 > waiting on condition [0x00007ffffa9ac000] > "MISC_STAGE:1" prio=5 tid=0x00000009103f4800 nid=0x91051df80 waiting > on condition [0x00007ffffaaad000] > "MIGRATION_STAGE:1" prio=5 tid=0x00000009103f5000 nid=0x91051e840 > waiting on condition [0x00007ffffabae000] > "AE_SERVICE_STAGE:1" prio=5 tid=0x00000009103f6000 nid=0x91051f100 > waiting on condition [0x00007ffffacaf000] > "GOSSIP_STAGE:1" prio=5 tid=0x00000009103f6800 nid=0x91051f9c0 waiting > on condition [0x00007ffffadb0000] > "STREAM_STAGE:1" prio=5 tid=0x00000009103f7800 nid=0x910520280 waiting > on condition [0x00007ffffaeb1000] > "RESPONSE_STAGE:4" prio=5 tid=0x00000009103f8000 nid=0x910520b40 > waiting on condition [0x00007ffffafb2000] > "RESPONSE_STAGE:3" prio=5 tid=0x00000009103f9000 nid=0x910521400 > waiting on condition [0x00007ffffb0b3000] > "RESPONSE_STAGE:2" prio=5 tid=0x00000009103f9800 nid=0x910521cc0 > waiting on condition [0x00007ffffb1b4000] > "RESPONSE_STAGE:1" prio=5 tid=0x00000009103fa800 nid=0x9103c8900 > waiting on condition [0x00007ffffb2b5000] > "READ_STAGE:8" prio=5 tid=0x0000000910505000 nid=0x9103ce380 waiting > on condition [0x00007ffffb3b6000] > "READ_STAGE:7" prio=5 tid=0x0000000910505800 nid=0x9103cec40 waiting > on condition [0x00007ffffb4b7000] > "READ_STAGE:6" prio=5 tid=0x0000000910506800 nid=0x9103cf500 waiting > on condition [0x00007ffffb5b8000] > "READ_STAGE:5" prio=5 tid=0x0000000910507000 nid=0x9103cfdc0 waiting > on condition [0x00007ffffb6b9000] > "READ_STAGE:4" prio=5 tid=0x0000000801cbf000 nid=0x9103d0680 waiting > on condition [0x00007ffffb7ba000] > "READ_STAGE:3" prio=5 tid=0x0000000801cbf800 nid=0x9103d0f40 waiting > on condition [0x00007ffffb8bb000] > "READ_STAGE:2" prio=5 tid=0x0000000801cc0800 nid=0x9103d1800 waiting > on condition [0x00007ffffb9bc000] > "READ_STAGE:1" prio=5 tid=0x0000000801cc1000 nid=0x9103d20c0 waiting > on condition [0x00007ffffbabd000] > "MUTATION_STAGE:32" prio=5 tid=0x0000000801cc2000 nid=0x9103d2980 > waiting on condition [0x00007ffffbbbe000] > "MUTATION_STAGE:31" prio=5 tid=0x0000000801cc2800 nid=0x9103d3240 > waiting on condition [0x00007ffffbcbf000] > "MUTATION_STAGE:30" prio=5 tid=0x0000000801cc3800 nid=0x9103d3b00 > waiting on condition [0x00007ffffbdc0000] > "MUTATION_STAGE:29" prio=5 tid=0x0000000801cc4000 nid=0x9103d43c0 > waiting on condition [0x00007ffffbec1000] > "MUTATION_STAGE:28" prio=5 tid=0x0000000801cc5000 nid=0x9103c21c0 > waiting on condition [0x00007ffffbfc2000] > "MUTATION_STAGE:27" prio=5 tid=0x0000000801cc5800 nid=0x9103c2a80 > waiting on condition [0x00007ffffc0c3000] > "MUTATION_STAGE:26" prio=5 tid=0x0000000801cc6800 nid=0x9103c3340 > waiting on condition [0x00007ffffc1c4000] > "MUTATION_STAGE:25" prio=5 tid=0x0000000801cc7000 nid=0x9103c3c00 > waiting on condition [0x00007ffffc2c5000] > "MUTATION_STAGE:24" prio=5 tid=0x0000000801cc8000 nid=0x9103c44c0 > waiting on condition [0x00007ffffc3c6000] > "MUTATION_STAGE:23" prio=5 tid=0x0000000801cc8800 nid=0x9103c4d80 > waiting on condition [0x00007ffffc4c7000] > "MUTATION_STAGE:22" prio=5 tid=0x0000000801cc9800 nid=0x9103c5640 > waiting on condition [0x00007ffffc5c8000] > "MUTATION_STAGE:21" prio=5 tid=0x0000000801ccb000 nid=0x9103c5f00 > waiting on condition [0x00007ffffc6c9000] > "MUTATION_STAGE:20" prio=5 tid=0x0000000801ccb800 nid=0x9103c67c0 > waiting on condition [0x00007ffffc7ca000] > "MUTATION_STAGE:19" prio=5 tid=0x0000000801ccc800 nid=0x9103c7080 > waiting on condition [0x00007ffffc8cb000] > "MUTATION_STAGE:18" prio=5 tid=0x0000000801ccd000 nid=0x9103c7940 > waiting on condition [0x00007ffffc9cc000] > "MUTATION_STAGE:17" prio=5 tid=0x0000000801cce000 nid=0x9103c8200 > waiting on condition [0x00007ffffcacd000] > "MUTATION_STAGE:16" prio=5 tid=0x0000000801cce800 nid=0x91037ae40 > waiting on condition [0x00007ffffcbce000] > "MUTATION_STAGE:15" prio=5 tid=0x0000000801ccf800 nid=0x9103b98c0 > waiting on condition [0x00007ffffcccf000] > "MUTATION_STAGE:14" prio=5 tid=0x0000000801cd0000 nid=0x9103ba180 > waiting on condition [0x00007ffffcdd0000] > "MUTATION_STAGE:13" prio=5 tid=0x0000000801cd1000 nid=0x9103baa40 > waiting on condition [0x00007ffffced1000] > "MUTATION_STAGE:12" prio=5 tid=0x0000000801cd1800 nid=0x9103bb300 > waiting on condition [0x00007ffffcfd2000] > "MUTATION_STAGE:11" prio=5 tid=0x0000000801cd2800 nid=0x9103bbbc0 > waiting on condition [0x00007ffffd0d3000] > "MUTATION_STAGE:10" prio=5 tid=0x0000000801cd3000 nid=0x9103bc480 > waiting on condition [0x00007ffffd1d4000] > "MUTATION_STAGE:9" prio=5 tid=0x0000000801cd4000 nid=0x9103bcd40 > waiting on condition [0x00007ffffd2d5000] > "MUTATION_STAGE:8" prio=5 tid=0x0000000801cd4800 nid=0x9103bd600 > waiting on condition [0x00007ffffd3d6000] > "MUTATION_STAGE:7" prio=5 tid=0x0000000801cd5800 nid=0x9103bdec0 > waiting on condition [0x00007ffffd4d7000] > "MUTATION_STAGE:6" prio=5 tid=0x0000000801cd7000 nid=0x9103be780 > waiting on condition [0x00007ffffd5d8000] > "MUTATION_STAGE:5" prio=5 tid=0x0000000801cd7800 nid=0x9103bf040 > waiting on condition [0x00007ffffd6d9000] > "MUTATION_STAGE:4" prio=5 tid=0x0000000801cd8800 nid=0x908d16c80 > waiting on condition [0x00007ffffd7da000] > "MUTATION_STAGE:3" prio=5 tid=0x0000000801cd9000 nid=0x910374700 > waiting on condition [0x00007ffffd8db000] > "MUTATION_STAGE:2" prio=5 tid=0x0000000801cda000 nid=0x910374fc0 > waiting on condition [0x00007ffffd9dc000] > "MUTATION_STAGE:1" prio=5 tid=0x0000000801cda800 nid=0x910375880 > waiting on condition [0x00007ffffdadd000] > "SSTABLE-CLEANUP-TIMER" prio=5 tid=0x0000000801cdb800 nid=0x910376140 > in Object.wait() [0x00007ffffdbde000] > "SSTABLE-DELETER" prio=5 tid=0x0000000801cdc000 nid=0x910376a00 in > Object.wait() [0x00007ffffdcdf000] > "DroppedMessagesLogger" prio=5 tid=0x0000000801cdd000 nid=0x9103772c0 > in Object.wait() [0x00007ffffdde0000] > "MESSAGE-STREAMING-POOL:1" prio=5 tid=0x0000000801cdd800 > nid=0x910377b80 waiting on condition [0x00007ffffdee1000] > "EXPIRING-MAP-TIMER-2" daemon prio=5 tid=0x0000000801cde800 > nid=0x910378440 in Object.wait() [0x00007ffffdfe2000] > "EXPIRING-MAP-TIMER-1" daemon prio=5 tid=0x0000000801cdf000 > nid=0x910378d00 in Object.wait() [0x00007ffffe0e3000] > "CONSISTENCY-MANAGER:4" prio=5 tid=0x0000000801ce0000 nid=0x9103795c0 > waiting on condition [0x00007ffffe1e4000] > "CONSISTENCY-MANAGER:3" prio=5 tid=0x0000000801ce0800 nid=0x910379e80 > waiting on condition [0x00007ffffe2e5000] > "CONSISTENCY-MANAGER:2" prio=5 tid=0x0000000801ce1800 nid=0x91037a740 > waiting on condition [0x00007ffffe3e6000] > "CONSISTENCY-MANAGER:1" prio=5 tid=0x0000000801ce3000 nid=0x908d10540 > waiting on condition [0x00007ffffe4e7000] > "MEMTABLE-POST-FLUSHER:1" prio=5 tid=0x0000000801ce3800 > nid=0x908d10e00 waiting on condition [0x00007ffffe5e8000] > "FLUSH-WRITER-POOL:1" prio=5 tid=0x0000000801ce4800 nid=0x908d116c0 > waiting on condition [0x00007ffffe6e9000] > "FLUSH-SORTER-POOL:1" prio=5 tid=0x0000000801ce5000 nid=0x908d11f80 > waiting on condition [0x00007ffffe7ea000] > "FLUSH-TIMER" prio=5 tid=0x0000000801ce6000 nid=0x908d12840 in > Object.wait() [0x00007ffffe8eb000] > "DynamicEndpointSnitch" prio=5 tid=0x0000000801ce6800 nid=0x908d13100 > in Object.wait() [0x00007ffffe9ec000] > "RMI TCP Accept-0" daemon prio=5 tid=0x0000000801ce7800 > nid=0x908d140c0 runnable [0x00007ffffebee000] > "RMI TCP Accept-8080" daemon prio=5 tid=0x0000000801ce8000 > nid=0x908d14980 runnable [0x00007ffffecef000] > "RMI TCP Accept-0" daemon prio=5 tid=0x0000000801ce9000 > nid=0x908d15240 runnable [0x00007ffffedf0000] > "Low Memory Detector" daemon prio=5 tid=0x0000000801ce9800 > nid=0x908d15cc0 runnable [0x0000000000000000] > "CompilerThread1" daemon prio=9 tid=0x0000000801cea800 nid=0x908d16580 > waiting on condition [0x0000000000000000] > "CompilerThread0" daemon prio=9 tid=0x0000000801ceb000 nid=0x801c3c380 > waiting on condition [0x0000000000000000] > "Signal Dispatcher" daemon prio=9 tid=0x0000000801cec000 > nid=0x801c3cc40 runnable [0x0000000000000000] > "Surrogate Locker Thread (CMS)" daemon prio=5 tid=0x0000000801cec800 > nid=0x801c3d500 waiting on condition [0x0000000000000000] > "Finalizer" daemon prio=8 tid=0x0000000801ced800 nid=0x801c3ddc0 in > Object.wait() [0x00007fffff3f6000] > "Reference Handler" daemon prio=10 tid=0x0000000801cef000 > nid=0x801c3e680 in Object.wait() [0x00007fffff4f7000] > "main" prio=5 tid=0x0000000801cef800 nid=0x800c0ae40 runnable > [0x00007fffffbfe000] > "VM Thread" prio=9 tid=0x0000000801d22000 nid=0x801c3ef40 runnable > "Gang worker#0 (Parallel GC Threads)" prio=9 tid=0x0000000801d26000 > nid=0x801c41cc0 runnable > "Gang worker#1 (Parallel GC Threads)" prio=9 tid=0x0000000801d25000 > nid=0x801c41400 runnable > "Gang worker#2 (Parallel GC Threads)" prio=9 tid=0x0000000801d24800 > nid=0x801c40b40 runnable > "Gang worker#3 (Parallel GC Threads)" prio=9 tid=0x0000000801d24000 > nid=0x801c40280 runnable > "Concurrent Mark-Sweep GC Thread" prio=9 tid=0x0000000801d23800 > nid=0x801c3f800 runnable > "VM Periodic Task Thread" prio=10 tid=0x0000000801d20800 > nid=0x908d139c0 waiting on condition > > > -- > / Peter Schuller >
