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From Peter Schuller <peter.schul...@infidyne.com>
Subject Re: 0.7 memory usage problem
Date Sat, 18 Sep 2010 17:20:36 GMT
> 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

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