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Bug
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Resolution: Fixed
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Critical
Our Jenkins instance runs 1.553 (since two weeks, was an three year old version before) on Linux with 10 slaves: 6 Linux connected through SSH and 4 windows with WebStart agent started as services.
When no job is running, CPU is almost 0. Correct.
When only two or three jobs are running, Jenkins CPU raises between 70% to 160%. atop declares 96% of CPU time spent in IRQ (even with "no" disk access), most CPU consumption is considered as system time. On average since boot, the master node consumes 100% of one CPU. Even if it has 4 CPUs, job execution time is between 2x and 3x compared to older version.
I configured JMX and did a quick CPU profiling. Top consumer threads are unnamed and are all related to SSH communication
"Thread-13" - Thread t@90 java.lang.Thread.State: RUNNABLE at java.net.SocketInputStream.socketRead0(Native Method) at java.net.SocketInputStream.read(SocketInputStream.java:152) at java.net.SocketInputStream.read(SocketInputStream.java:122) at com.trilead.ssh2.crypto.cipher.CipherInputStream.fill_buffer(CipherInputStream.java:41) at com.trilead.ssh2.crypto.cipher.CipherInputStream.internal_read(CipherInputStream.java:52) at com.trilead.ssh2.crypto.cipher.CipherInputStream.getBlock(CipherInputStream.java:79) at com.trilead.ssh2.crypto.cipher.CipherInputStream.read(CipherInputStream.java:108) at com.trilead.ssh2.transport.TransportConnection.receiveMessage(TransportConnection.java:232) at com.trilead.ssh2.transport.TransportManager.receiveLoop(TransportManager.java:682) at com.trilead.ssh2.transport.TransportManager$1.run(TransportManager.java:480) at java.lang.Thread.run(Thread.java:744)
So there is chance the "SSH agent plugin" is concerned.
I am ready to do deeper analysis on my system if required, and of course to test patches.
- duplicates
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- Closed
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- is related to
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- Open
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