asmhatre
c7eccd1db5
Custom OrderProcessed event, CPU/allocation/lock workloads, a diagnostic endpoint over the JVM's live FlightRecorder state, a JUnit test using the jdk.jfr.Recording API, and nine captured recordings (flagship, mid-flight snapshot, isolated vs concurrent threshold comparisons, and a real dump+stop duplication bug) with their docs/output/*.txt transcripts.
40 lines
2.2 KiB
Plaintext
40 lines
2.2 KiB
Plaintext
Top stack frames from jdk.ExecutionSample, live-demo.jfr, during six concurrent
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GET /api/cpu/fibonacci?n=38 calls, aggregated by the top (leaf) frame only.
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$ jfr print --events jdk.ExecutionSample --stack-depth 1 recordings/live-demo.jfr \
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| grep -A1 stackTrace | grep -v 'stackTrace\|^--' | sed 's/^\s*//' | sort | uniq -c | sort -rn
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62 com.ankurm.jfr.service.WorkloadService.fibonacci(int) line: 40
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13 com.ankurm.jfr.service.WorkloadService.churnAllocations(int) line: 56
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9 com.ankurm.jfr.service.WorkloadService.churnAllocations(int) line: 52
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2 jdk.internal.util.DecimalDigits.uncheckedGetCharsLatin1(int, int, byte[]) line: 168
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1 org.apache.tomcat.util.net.NioEndpoint$Poller.run() line: 941
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1 org.apache.tomcat.util.http.MimeHeaders.addValue(byte[], int, int) line: 327
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1 org.apache.catalina.mapper.Mapper.compareIgnoreCase(CharChunk, int, int, String) line: 1401
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1 org.apache.catalina.core.ApplicationFilterFactory.createFilterChain(ServletRequest, Wrapper, Servlet) line: 75
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1 jdk.internal.util.DecimalDigits.stringSize(int) line: 101
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1 jdk.internal.misc.Unsafe.allocateUninitializedArray(Class, int) line: 1396
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1 java.util.concurrent.locks.LockSupport.unpark(Thread) line: 181
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1 java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.signalAll() line: 1590
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1 java.util.Arrays.copyOf(Object[], int) line: 3478
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1 java.nio.Buffer.position(int) line: 325
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1 java.lang.invoke.DirectMethodHandle.allocateInstance(Object) line: 500
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total jdk.ExecutionSample events in recording: 98
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fibonacci() share of samples: 62 / 98 = 63.3%
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$ jfr print --events jdk.ExecutionSample recordings/live-demo.jfr | head -13
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jdk.ExecutionSample {
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startTime = 09:59:03.699 (2026-10-01)
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sampledThread = "http-nio-8080-exec-1" (javaThreadId = 30)
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state = "STATE_RUNNABLE"
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stackTrace = [
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com.ankurm.jfr.service.WorkloadService.fibonacci(int) line: 40
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com.ankurm.jfr.service.WorkloadService.fibonacci(int) line: 40
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com.ankurm.jfr.service.WorkloadService.fibonacci(int) line: 40
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com.ankurm.jfr.service.WorkloadService.fibonacci(int) line: 40
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com.ankurm.jfr.service.WorkloadService.fibonacci(int) line: 40
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...
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]
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}
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