This just does some heavily contended things
vshakhov@ubuntu:~$ pidstat -w -I -t -p 2486 5
Linux 4.8.0-22-generic (ubuntu) 12/17/2016 _x86_64_ (2 CPU)
09:48:32 PM UID TGID TID cswch/s nvcswch/s Command
09:48:37 PM 1000 2486 - 0.00 0.00 java
09:48:37 PM 1000 - 2486 0.00 0.00 |__java
09:48:37 PM 1000 - 2488 12951.40 73.40 |__java
"main" #1 prio=5 os_prio=0 tid=0x00007f36a000a000 nid=0x9b8 (2488) waiting on condition [0x00007f36a7d40000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000000b3a08760> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:870)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1199)
at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:209)
at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:285)
at java.util.concurrent.ArrayBlockingQueue.offer(ArrayBlockingQueue.java:327)
at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1361)
at com.google.common.util.concurrent.MoreExecutors$ListeningDecorator.execute(MoreExecutors.java:556)
at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134)
at com.google.common.util.concurrent.AbstractListeningExecutorService.submit(AbstractListeningExecutorService.java:61)
at Contention.main(Contention.java:35)
09:48:37 PM 1000 - 2492 57.40 0.00 |__java
09:48:37 PM 1000 - 2493 62.80 0.00 |__java
09:48:37 PM 1000 - 2494 91.40 1.60 |__java
09:48:37 PM 1000 - 2495 0.00 0.00 |__java
09:48:37 PM 1000 - 2496 0.00 0.00 |__java
09:48:37 PM 1000 - 2497 0.00 0.00 |__java
09:48:37 PM 1000 - 2498 0.20 0.00 |__java
09:48:37 PM 1000 - 2499 0.20 0.00 |__java
09:48:37 PM 1000 - 2500 0.00 0.00 |__java
09:48:37 PM 1000 - 2501 20.00 0.00 |__java
09:48:37 PM 1000 - 2502 8482.00 224.20 |__java
"pool-1-thread-1" #9 prio=5 os_prio=0 tid=0x00007f36a012f000 nid=0x9c6 (2502) waiting on condition [0x00007f368cc0c000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000000b3a9afb0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
at java.util.concurrent.ArrayBlockingQueue.take(ArrayBlockingQueue.java:403)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
09:48:37 PM 1000 - 2503 8748.20 28.00 |__java
pool-1-thread-2" #10 prio=5 os_prio=0 tid=0x00007f36a013f000 nid=0x9c7 (2503) waiting on condition [0x00007f368cb0b000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000000b3a9afb0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
at java.util.concurrent.ArrayBlockingQueue.take(ArrayBlockingQueue.java:403)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
09:48:37 PM 1000 - 2566 0.00 0.00 |__javavshakhov@ubuntu:~$ sudo stap futexes.stp
^Cjava[3308] lock 0x7f481c0b5854 contended 1 times, 113 avg us
java[3308] lock 0x7f481c0b8028 contended 1 times, 94 avg us
java[3308] lock 0x7f481cdee114 contended 158 times, 34624 avg us
java[3333] lock 0x7f63d812fc70 contended 4037 times, 47 avg us
java[3333] lock 0x7f63d800b1e8 contended 22574 times, 18 avg us
java[3333] lock 0x7f63d8021f50 contended 12 times, 45 avg us
java[3333] lock 0x7f63d800b210 contended 13706 times, 47 avg us
java[3333] lock 0x7f63d8140634 contended 92765 times, 111 avg us
java[3333] lock 0x7f63d8140630 contended 2313 times, 33 avg us
java[3333] lock 0x7f63d812fc74 contended 95261 times, 118 avg us
java[3333] lock 0x7f63d8021f28 contended 57 times, 8 avg us
java[3333] lock 0x7f63d813fb54 contended 287 times, 825 avg us
java[3333] lock 0x7f63d8140608 contended 5401 times, 14 avg us
java[3333] lock 0x7f63d8021f54 contended 713 times, 26504 avg us
java[3333] lock 0x7f63d80b8328 contended 1 times, 4 avg us
java[3333] lock 0x7f63d800ad54 contended 251 times, 905 avg us
java[3333] lock 0x7f63d813fb28 contended 5 times, 9 avg us
java[3333] lock 0x7f63d8074850 contended 9 times, 26 avg us
java[3333] lock 0x7f63d8074828 contended 369 times, 17 avg us
java[3333] lock 0x7f63d8020328 contended 14 times, 13 avg us
java[3333] lock 0x7f63d812fc48 contended 8805 times, 14 avg us
java[3333] lock 0x7f63d800ad28 contended 7 times, 17 avg us
java[3333] lock 0x7f63d8074854 contended 603 times, 158 avg us
java[3333] lock 0x7f63d800b214 contended 111924 times, 110 avg us
java[3333] lock 0x7f63d8020350 contended 13 times, 24 avg us
java[3333] lock 0x7f63d812f854 contended 275 times, 900 avg us
java[3333] lock 0x7f63d812f850 contended 28 times, 29 avg us
java[3333] lock 0x7f63d813fb50 contended 23 times, 28 avg us
java[3333] lock 0x7f63d813f754 contended 3 times, 93 avg us
java[3333] lock 0x7f63d800ad50 contended 1 times, 26 avg us
java[3333] lock 0x7f63d812f828 contended 6 times, 18 avg us
java[3333] lock 0x7f63d812f454 contended 1 times, 442 avg us
java[3333] lock 0x7f63d813fd28 contended 1 times, 23 avg us
java[3333] lock 0x7f63d800af54 contended 1 times, 26 avg us
java[3333] lock 0x7f63d8020354 contended 762 times, 24803 avg us
java[3333] lock 0x7f63d813fd54 contended 4 times, 58 avg us
java[3333] lock 0x7f63d812fa54 contended 2 times, 85 avg us
WARNING: Number of errors: 0, skipped probes: 52
vshakhov@ubuntu:~$ pidstat -w -I -t -p 4357 5
Linux 4.8.0-22-generic (ubuntu) 12/18/2016 _x86_64_ (2 CPU)
03:11:34 PM UID TGID TID cswch/s nvcswch/s Command
03:11:39 PM 1000 4357 - 0.00 0.00 java
03:11:39 PM 1000 - 4357 0.00 0.00 |__java
03:11:39 PM 1000 - 4359 0.00 0.00 |__java
03:11:39 PM 1000 - 4363 29.20 4.80 |__java
03:11:39 PM 1000 - 4364 29.00 4.80 |__java
03:11:39 PM 1000 - 4365 49.20 0.80 |__java
03:11:39 PM 1000 - 4366 0.00 0.00 |__java
03:11:39 PM 1000 - 4367 0.00 0.00 |__java
03:11:39 PM 1000 - 4368 0.00 0.00 |__java
03:11:39 PM 1000 - 4369 0.20 0.00 |__java
03:11:39 PM 1000 - 4370 0.20 0.00 |__java
03:11:39 PM 1000 - 4371 0.00 0.00 |__java
03:11:39 PM 1000 - 4372 20.00 0.00 |__java
03:11:39 PM 1000 - 4373 465.00 330.80 |__java
"pusher 0" #8 prio=5 os_prio=0 tid=0x00007fe28810f800 nid=0x1115 runnable [0x00007fe2761f0000]
java.lang.Thread.State: RUNNABLE
at java.lang.Integer.valueOf(Integer.java:832)
at ContentionLess.lambda$null$0(ContentionLess.java:34)
at ContentionLess$$Lambda$6/558638686.run(Unknown Source)
at java.lang.Thread.run(Thread.java:745)
03:11:39 PM 1000 - 4374 475.00 363.60 |__java
"pusher 1" #9 prio=5 os_prio=0 tid=0x00007fe288113000 nid=0x1116 waiting on condition [0x00007fe2760ef000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000000b3a09fd0> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:870)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1199)
at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:209)
at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:285)
at ContentionLess.syncMax(ContentionLess.java:67)
at ContentionLess.lambda$null$0(ContentionLess.java:36)
at ContentionLess$$Lambda$6/558638686.run(Unknown Source)
at java.lang.Thread.run(Thread.java:745)
03:11:39 PM 1000 - 4392 0.00 0.00 |__java
03:11:39 PM 1000 - 4393 0.00 0.00 |__java
03:11:39 PM 1000 - 4397 0.00 0.00 |__javavshakhov@ubuntu:~$ sudo stap ./futexes.stp
[sudo] password for vshakhov:
^Cjava[4334] lock 0x7fc4b8d2eaf4 contended 192 times, 5534 avg us
java[4334] lock 0x7fc4b8d2eac8 contended 1 times, 33 avg us
java[4357] lock 0x7fe288112654 contended 261 times, 1422 avg us
java[4357] lock 0x7fe288074854 contended 449 times, 189 avg us
java[4357] lock 0x7fe288112b04 contended 12089 times, 37 avg us
java[4357] lock 0x7fe288020350 contended 5 times, 31 avg us
java[4357] lock 0x7fe288020328 contended 90 times, 5 avg us
java[4357] lock 0x7fe288112228 contended 5 times, 4 avg us
java[4357] lock 0x7fe288114630 contended 3258 times, 31 avg us
java[4357] lock 0x7fe288112ad8 contended 5996 times, 9 avg us
java[4357] lock 0x7fe288113e28 contended 3 times, 10 avg us
java[4357] lock 0x7fe288020354 contended 582 times, 29835 avg us
java[4357] lock 0x7fe288114608 contended 4208 times, 13 avg us
java[4357] lock 0x7fe288021f28 contended 11 times, 18 avg us
java[4357] lock 0x7fe288112254 contended 38 times, 374 avg us
java[4357] lock 0x7fe288112b00 contended 4495 times, 31 avg us
java[4357] lock 0x7fe288114254 contended 263 times, 1513 avg us
java[4357] lock 0x7fe288113e54 contended 20 times, 419 avg us
java[4357] lock 0x7fe288114228 contended 8 times, 428 avg us
java[4357] lock 0x7fe288114634 contended 9446 times, 37 avg us
java[4357] lock 0x7fe288074828 contended 232 times, 4 avg us
java[4357] lock 0x7fe288112650 contended 30 times, 26 avg us
java[4357] lock 0x7fe288112628 contended 3 times, 11 avg us
java[4357] lock 0x7fe288114250 contended 35 times, 26 avg us
java[4357] lock 0x7fe288021f54 contended 598 times, 29033 avg us
java[4357] lock 0x7fe288021f50 contended 14 times, 25 avg us
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent