asmhatreandClaude Sonnet 5
0819993c51
Reproduces the pinning JEP 491 did not fix (native JNI frames) with a real native library, alongside the monitor case it did fix. Covers the jdk.VirtualThreadPinned JFR event, reading pinned vs unmounted virtual threads from a jcmd Thread.dump_to_file, the measured throughput cost on a capped carrier pool, and a bounded-executor pattern to contain the blast radius. Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01FhzLY5p6okFva3qsnsRyvM
46 lines
1.6 KiB
Plaintext
46 lines
1.6 KiB
Plaintext
$ java ThreadDumpPinnedDemo &
|
|
pid=7126
|
|
done
|
|
|
|
$ jcmd <pid> Thread.dump_to_file -format=json threaddump.json (taken mid-flight)
|
|
7126:
|
|
Created /home/claude/java-core-examples/vt-pinning/target/threaddump.json
|
|
|
|
--- the two virtual thread entries from that dump ---
|
|
{
|
|
"tid": "22",
|
|
"time": "2026-09-30T06:32:51.489994627Z",
|
|
"virtual": true,
|
|
"name": "",
|
|
"state": "TIMED_WAITING",
|
|
"stack": [
|
|
"java.base/jdk.internal.misc.Unsafe.park(Native Method)",
|
|
"java.base/java.lang.VirtualThread.parkOnCarrierThread(VirtualThread.java:822)",
|
|
"java.base/java.lang.VirtualThread.parkNanos(VirtualThread.java:801)",
|
|
"java.base/java.lang.VirtualThread.sleepNanos(VirtualThread.java:983)",
|
|
"java.base/java.lang.Thread.sleepNanos(Thread.java:507)",
|
|
"java.base/java.lang.Thread.sleep(Thread.java:540)",
|
|
"com.ankurm.vtpinning.ThreadDumpPinnedDemo.sleepCallback(ThreadDumpPinnedDemo.java:22)",
|
|
"com.ankurm.vtpinning.ThreadDumpPinnedDemo.blockingNativeCall(Native Method)",
|
|
"java.base/java.lang.VirtualThread.run(VirtualThread.java:460)"
|
|
],
|
|
"carrier": "23"
|
|
}
|
|
|
|
{
|
|
"tid": "24",
|
|
"time": "2026-09-30T06:32:51.490322496Z",
|
|
"virtual": true,
|
|
"name": "",
|
|
"state": "TIMED_WAITING",
|
|
"stack": [
|
|
"java.base/java.lang.VirtualThread.parkNanos(VirtualThread.java:787)",
|
|
"java.base/java.lang.VirtualThread.sleepNanos(VirtualThread.java:983)",
|
|
"java.base/java.lang.Thread.sleepNanos(Thread.java:507)",
|
|
"java.base/java.lang.Thread.sleep(Thread.java:540)",
|
|
"com.ankurm.vtpinning.ThreadDumpPinnedDemo.lambda$main$0(ThreadDumpPinnedDemo.java:34)",
|
|
"java.base/java.lang.VirtualThread.run(VirtualThread.java:460)"
|
|
]
|
|
}
|
|
|