Chris,
I did set -Djdk.tracePinnedThreads=full and found there were a few pinned
threads:
Thread[#43,ForkJoinPool-1-worker-4,5,CarrierThreads]
java.base/java.lang.VirtualThread$VThreadContinuation.onPinned(VirtualThread.java:185)
java.base/jdk.internal.vm.Continuation.onPinned0(Continuation.java:393)
java.base/java.lang.VirtualThread.parkNanos(VirtualThread.java:631)
java.base/java.lang.System$2.parkVirtualThread(System.java:2648)
java.base/jdk.internal.misc.VirtualThreads.park(VirtualThreads.java:67)
java.base/java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:408)
…
com.mysql.cj.protocol.FullReadInputStream.readFully(FullReadInputStream.java:64)
com.mysql.cj.protocol.a.SimplePacketReader.readHeaderLocal(SimplePacketReader.java:81)
…
com.mysql.cj.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:2005)
<== monitors:1
com.zaxxer.hikari.pool.ProxyConnection.setAutoCommit(ProxyConnection.java:401)
com.zaxxer.hikari.pool.HikariProxyConnection.setAutoCommit(HikariProxyConnection.java)
…
Over the 12 test runs I have performed, I found a 53% decrease in throughput
when using virtual threads:
http://ec2-18-188-185-212.us-east-2.compute.amazonaws.com:8080/web-report/
My example code is located here: https://github.com/wcrowell/rest-mysql-app/
The JMX test I used is located here:
https://github.com/wcrowell/rest-mysql-app/blob/main/virtual-thread-test.jmx
This test makes a POST request to save a record to MySQL:
http://ec2-18-117-196-158.us-east-2.compute.amazonaws.com:8080/vt/save
Regards,
William Crowell
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