asmhatreandClaude Sonnet 5
4a74153d87
Adds JMH put/get throughput benchmarks (synchronizedMap vs ConcurrentHashMap, swept at 1/2/4/8 threads), a computeIfAbsent recursion trap demo (CHM tolerates recursion into a different key but throws IllegalStateException on the same key; plain HashMap throws ConcurrentModificationException even single-threaded), and a null-handling demo (CHM rejects null keys/values on put() and null keys on get() too). 7/7 JUnit tests pass; all output/ transcripts captured from real runs. Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01FhzLY5p6okFva3qsnsRyvM
92 lines
6.2 KiB
Plaintext
92 lines
6.2 KiB
Plaintext
$ java -jar benchmarks.jar PutGetBenchmark -t 8
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WARNING: A terminally deprecated method in sun.misc.Unsafe has been called
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WARNING: sun.misc.Unsafe::objectFieldOffset has been called by org.openjdk.jmh.util.Utils (file:/home/claude/java-core-examples/hashmap-concurrenthashmap/target/benchmarks.jar)
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WARNING: Please consider reporting this to the maintainers of class org.openjdk.jmh.util.Utils
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WARNING: sun.misc.Unsafe::objectFieldOffset will be removed in a future release
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# JMH version: 1.37
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# VM version: JDK 25.0.4.1, OpenJDK 64-Bit Server VM, 25.0.4.1+1-LTS
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# VM invoker: /tmp/tools/jdk-25.0.4.1+1/bin/java
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# VM options: -Djavax.net.ssl.trustStore=/etc/ssl/certs/java/cacerts -Djavax.net.ssl.trustStoreType=JKS -Dhttps.proxyHost=127.0.0.1 -Dhttps.proxyPort=36265 -Dhttp.nonProxyHosts=localhost|127.0.0.1|::1|127.*|0.*|::|169.254.*|api.anthropic.com|api-staging.anthropic.com|api-pr-preview.anthropic.com|mcp-proxy.anthropic.com|mcp-proxy-staging.anthropic.com|registry.npmjs.org|jsr.io|npm.jsr.io|pypi.org|files.pythonhosted.org|index.crates.io|proxy.golang.org|host.docker.internal|10.*|172.16.*|172.17.*|172.18.*|172.19.*|172.20.*|172.21.*|172.22.*|172.23.*|172.24.*|172.25.*|172.26.*|172.27.*|172.28.*|172.29.*|172.30.*|172.31.*|192.168.*|100.64.0.0/10|*.svc.cluster.local|*.svc.cluster.local -Djdk.http.auth.tunneling.disabledSchemes= -Djdk.http.auth.proxying.disabledSchemes=
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# Blackhole mode: compiler (auto-detected, use -Djmh.blackhole.autoDetect=false to disable)
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# Warmup: 3 iterations, 1 s each
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# Measurement: 5 iterations, 1 s each
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# Timeout: 10 min per iteration
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# Threads: 8 threads, will synchronize iterations
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# Benchmark mode: Throughput, ops/time
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# Benchmark: com.ankurm.hashmapconcurrenthashmap.PutGetBenchmark.concurrentHashMapPutGet
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# Run progress: 0.00% complete, ETA 00:00:16
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# Fork: 1 of 1
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WARNING: A terminally deprecated method in sun.misc.Unsafe has been called
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WARNING: sun.misc.Unsafe::objectFieldOffset has been called by org.openjdk.jmh.util.Utils (file:/home/claude/java-core-examples/hashmap-concurrenthashmap/target/benchmarks.jar)
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WARNING: Please consider reporting this to the maintainers of class org.openjdk.jmh.util.Utils
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WARNING: sun.misc.Unsafe::objectFieldOffset will be removed in a future release
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# Warmup Iteration 1: 34283.922 ops/ms
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# Warmup Iteration 2: 30625.356 ops/ms
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# Warmup Iteration 3: 45011.575 ops/ms
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Iteration 1: 45542.175 ops/ms
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Iteration 2: 43859.481 ops/ms
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Iteration 3: 40886.605 ops/ms
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Iteration 4: 40557.579 ops/ms
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Iteration 5: 45152.391 ops/ms
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Result "com.ankurm.hashmapconcurrenthashmap.PutGetBenchmark.concurrentHashMapPutGet":
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43199.646 ±(99.9%) 9044.242 ops/ms [Average]
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(min, avg, max) = (40557.579, 43199.646, 45542.175), stdev = 2348.761
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CI (99.9%): [34155.404, 52243.888] (assumes normal distribution)
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# JMH version: 1.37
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# VM version: JDK 25.0.4.1, OpenJDK 64-Bit Server VM, 25.0.4.1+1-LTS
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# VM invoker: /tmp/tools/jdk-25.0.4.1+1/bin/java
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# VM options: -Djavax.net.ssl.trustStore=/etc/ssl/certs/java/cacerts -Djavax.net.ssl.trustStoreType=JKS -Dhttps.proxyHost=127.0.0.1 -Dhttps.proxyPort=36265 -Dhttp.nonProxyHosts=localhost|127.0.0.1|::1|127.*|0.*|::|169.254.*|api.anthropic.com|api-staging.anthropic.com|api-pr-preview.anthropic.com|mcp-proxy.anthropic.com|mcp-proxy-staging.anthropic.com|registry.npmjs.org|jsr.io|npm.jsr.io|pypi.org|files.pythonhosted.org|index.crates.io|proxy.golang.org|host.docker.internal|10.*|172.16.*|172.17.*|172.18.*|172.19.*|172.20.*|172.21.*|172.22.*|172.23.*|172.24.*|172.25.*|172.26.*|172.27.*|172.28.*|172.29.*|172.30.*|172.31.*|192.168.*|100.64.0.0/10|*.svc.cluster.local|*.svc.cluster.local -Djdk.http.auth.tunneling.disabledSchemes= -Djdk.http.auth.proxying.disabledSchemes=
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# Blackhole mode: compiler (auto-detected, use -Djmh.blackhole.autoDetect=false to disable)
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# Warmup: 3 iterations, 1 s each
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# Measurement: 5 iterations, 1 s each
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# Timeout: 10 min per iteration
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# Threads: 8 threads, will synchronize iterations
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# Benchmark mode: Throughput, ops/time
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# Benchmark: com.ankurm.hashmapconcurrenthashmap.PutGetBenchmark.synchronizedHashMapPutGet
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# Run progress: 50.00% complete, ETA 00:00:08
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# Fork: 1 of 1
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WARNING: A terminally deprecated method in sun.misc.Unsafe has been called
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WARNING: sun.misc.Unsafe::objectFieldOffset has been called by org.openjdk.jmh.util.Utils (file:/home/claude/java-core-examples/hashmap-concurrenthashmap/target/benchmarks.jar)
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WARNING: Please consider reporting this to the maintainers of class org.openjdk.jmh.util.Utils
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WARNING: sun.misc.Unsafe::objectFieldOffset will be removed in a future release
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# Warmup Iteration 1: 6343.850 ops/ms
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# Warmup Iteration 2: 8158.137 ops/ms
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# Warmup Iteration 3: 7888.039 ops/ms
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Iteration 1: 7586.558 ops/ms
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Iteration 2: 8206.180 ops/ms
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Iteration 3: 7242.487 ops/ms
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Iteration 4: 7706.814 ops/ms
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Iteration 5: 8379.430 ops/ms
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Result "com.ankurm.hashmapconcurrenthashmap.PutGetBenchmark.synchronizedHashMapPutGet":
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7824.294 ±(99.9%) 1788.407 ops/ms [Average]
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(min, avg, max) = (7242.487, 7824.294, 8379.430), stdev = 464.444
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CI (99.9%): [6035.887, 9612.701] (assumes normal distribution)
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# Run complete. Total time: 00:00:17
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REMEMBER: The numbers below are just data. To gain reusable insights, you need to follow up on
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why the numbers are the way they are. Use profilers (see -prof, -lprof), design factorial
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experiments, perform baseline and negative tests that provide experimental control, make sure
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the benchmarking environment is safe on JVM/OS/HW level, ask for reviews from the domain experts.
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Do not assume the numbers tell you what you want them to tell.
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NOTE: Current JVM experimentally supports Compiler Blackholes, and they are in use. Please exercise
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extra caution when trusting the results, look into the generated code to check the benchmark still
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works, and factor in a small probability of new VM bugs. Additionally, while comparisons between
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different JVMs are already problematic, the performance difference caused by different Blackhole
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modes can be very significant. Please make sure you use the consistent Blackhole mode for comparisons.
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Benchmark Mode Cnt Score Error Units
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PutGetBenchmark.concurrentHashMapPutGet thrpt 5 43199.646 ± 9044.242 ops/ms
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PutGetBenchmark.synchronizedHashMapPutGet thrpt 5 7824.294 ± 1788.407 ops/ms
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