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top threads
M. Isuru Tharanga Chrishantha Perera edited this page Feb 23, 2018
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Show top CPU consuming threads.
./top-threads -h
Usage:
top-threads -p <pid> [-n <number_of_threads>] [-x] [-o <output_directory>] [-t] [-l <number_of_lines>] [-h]
-p: The Java Process ID
-n: Number of top threads to display. Default: 10.
-x: Do not save thread dump and PS output
-o: Output directory to save results. Works with -s option. A temp directory is used by default.
-t: Print stack traces.
-l: Number of lines to print in stack traces. Works with -t option. Default: 3.
-h: Display this help.
Example: Monitoring highcpu sample program
./top-threads -p `pgrep -f highcpu`
Name %CPU %MEM Thread Status State Nice CPU Time LWP NID
"Thread 0: Math" 53.6 9.0 RUNNABLE R 0 00:00:32 30164 0x75d4
"Thread 1: Math" 53.2 9.0 RUNNABLE R 0 00:00:32 30165 0x75d5
"Thread 3: Hashing" 38.3 9.0 RUNNABLE R 0 00:00:23 30157 0x75cd
"Thread 2: Hashing" 37.9 9.0 RUNNABLE S 0 00:00:23 30156 0x75cc
"Thread 5: Hashing" 37.7 9.0 BLOCKED S 0 00:00:23 30159 0x75cf
"Thread 1: Hashing" 37.7 9.0 RUNNABLE S 0 00:00:23 30155 0x75cb
"Thread 0: Hashing" 37.7 9.0 BLOCKED S 0 00:00:23 30154 0x75ca
"Thread 4: Hashing" 37.2 9.0 RUNNABLE S 0 00:00:22 30158 0x75ce
"VM Thread" 2.5 9.0 S 0 00:00:01 30144 0x75c0
"C2 CompilerThread1" 0.9 9.0 RUNNABLE S 0 00:00:00 30149 0x75c5
PS output saved: /tmp/top-threads.3oT2Mb/1519363418363-ps.txt
Thread dump saved: /tmp/top-threads.3oT2Mb/1519363418363-thread-dump.txt
Top threads saved: /tmp/top-threads.3oT2Mb/1519363418363-top-threads.txt
./top-threads -p `pgrep -f highcpu` -t
Name %CPU %MEM Thread Status State Nice CPU Time LWP NID
"Thread 0: Math" 51.1 9.1 RUNNABLE R 0 00:00:49 30164 0x75d4
"Thread 0: Math" #20 prio=5 os_prio=0 tid=0x00007f091826e000 nid=0x75d4 runnable [0x00007f08f9c00000]
java.lang.Thread.State: RUNNABLE
at java.lang.StrictMath.atan(Native Method)
at java.lang.Math.atan(Math.java:222)
at com.github.chrishantha.sample.highcpu.MathWorker.run(MathWorker.java:32)
"Thread 1: Math" 50.6 9.1 RUNNABLE R 0 00:00:48 30165 0x75d5
"Thread 1: Math" #21 prio=5 os_prio=0 tid=0x00007f0918270000 nid=0x75d5 runnable [0x00007f08f9aff000]
java.lang.Thread.State: RUNNABLE
at sun.misc.FloatingDecimal$BinaryToASCIIBuffer.access$100(FloatingDecimal.java:259)
at sun.misc.FloatingDecimal.getBinaryToASCIIConverter(FloatingDecimal.java:1785)
at sun.misc.FloatingDecimal.getBinaryToASCIIConverter(FloatingDecimal.java:1738)
"Thread 5: Hashing" 37.2 9.1 RUNNABLE S 0 00:00:35 30159 0x75cf
"Thread 5: Hashing" #15 prio=5 os_prio=0 tid=0x00007f0918265000 nid=0x75cf runnable [0x00007f08fa105000]
java.lang.Thread.State: RUNNABLE
at java.util.Arrays.copyOfRange(Arrays.java:3664)
at java.lang.String.<init>(String.java:207)
at java.lang.StringBuilder.toString(StringBuilder.java:407)
"Thread 3: Hashing" 37.2 9.1 RUNNABLE S 0 00:00:35 30157 0x75cd
"Thread 3: Hashing" #13 prio=5 os_prio=0 tid=0x00007f0918262000 nid=0x75cd runnable [0x00007f08fa307000]
java.lang.Thread.State: RUNNABLE
at sun.security.provider.NativePRNG$RandomIO.implNextBytes(NativePRNG.java:534)
at sun.security.provider.NativePRNG$RandomIO.access$400(NativePRNG.java:331)
at sun.security.provider.NativePRNG.engineNextBytes(NativePRNG.java:220)
"Thread 4: Hashing" 37.1 9.1 RUNNABLE R 0 00:00:35 30158 0x75ce
"Thread 4: Hashing" #14 prio=5 os_prio=0 tid=0x00007f0918263800 nid=0x75ce runnable [0x00007f08fa206000]
java.lang.Thread.State: RUNNABLE
at java.util.Arrays.copyOfRange(Arrays.java:3664)
at java.lang.String.<init>(String.java:207)
at java.lang.StringBuilder.toString(StringBuilder.java:407)
"Thread 1: Hashing" 37.0 9.1 RUNNABLE R 0 00:00:35 30155 0x75cb
"Thread 1: Hashing" #11 prio=5 os_prio=0 tid=0x00007f091825e800 nid=0x75cb runnable [0x00007f08fa509000]
java.lang.Thread.State: RUNNABLE
at java.security.MessageDigest$Delegate.engineUpdate(MessageDigest.java:584)
at java.security.MessageDigest.update(MessageDigest.java:335)
at sun.security.provider.SecureRandom.engineNextBytes(SecureRandom.java:243)
"Thread 2: Hashing" 36.6 9.1 RUNNABLE R 0 00:00:35 30156 0x75cc
"Thread 2: Hashing" #12 prio=5 os_prio=0 tid=0x00007f0918260000 nid=0x75cc runnable [0x00007f08fa408000]
java.lang.Thread.State: RUNNABLE
at java.util.Arrays.copyOfRange(Arrays.java:3664)
at java.lang.String.<init>(String.java:207)
at java.lang.StringBuilder.toString(StringBuilder.java:407)
"Thread 0: Hashing" 36.4 9.1 RUNNABLE S 0 00:00:34 30154 0x75ca
"Thread 0: Hashing" #10 prio=5 os_prio=0 tid=0x00007f091825a800 nid=0x75ca runnable [0x00007f08fa60a000]
java.lang.Thread.State: RUNNABLE
at java.util.Arrays.copyOfRange(Arrays.java:3664)
at java.lang.String.<init>(String.java:207)
at java.lang.StringBuilder.toString(StringBuilder.java:407)
"VM Thread" 2.5 9.1 S 0 00:00:02 30144 0x75c0
"VM Thread" os_prio=0 tid=0x00007f0918140000 nid=0x75c0 runnable
"GC task thread#3 (ParallelGC)" 0.8 9.1 S 0 00:00:00 30143 0x75bf
"GC task thread#3 (ParallelGC)" os_prio=0 tid=0x00007f0918026000 nid=0x75bf runnable
PS output saved: /tmp/top-threads.vK8gFa/1519363452730-ps.txt
Thread dump saved: /tmp/top-threads.vK8gFa/1519363452730-thread-dump.txt
Top threads saved: /tmp/top-threads.vK8gFa/1519363452730-top-threads.txt
watch -n 1 ./top-threads -p `pgrep -f highcpu` -o /tmp/highcpu-threads
It's highly recommended to use -o option with a directory when using watch command.
The output directory can be later used with analyze-jstack-samples command.