asmhatreandClaude Sonnet 5.5
df13a904d7
Spring Boot 4.1.1 harness measuring first-response time versus initial heap size and a 20,000-request warmup. Shows -XX:+ZAdaptiveHeapSizing is not yet in any build. Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01WzVQ6zFh9cuLPj9RSbRH8U
38 lines
1.6 KiB
Java
38 lines
1.6 KiB
Java
import java.net.URI;
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import java.net.http.*;
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import java.util.*;
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import java.util.concurrent.*;
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import java.util.concurrent.atomic.*;
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/** Fires TOTAL requests with THREADS threads and reports how long each batch of BATCH took. */
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public class Warmup {
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public static void main(String[] a) throws Exception {
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int port = Integer.parseInt(a[0]);
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int total = 20_000, batch = 2_000, threads = 4;
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HttpClient c = HttpClient.newBuilder().version(HttpClient.Version.HTTP_1_1).build();
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HttpRequest rq = HttpRequest.newBuilder(URI.create("http://localhost:" + port + "/hello")).build();
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AtomicInteger done = new AtomicInteger();
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long[] batchEnd = new long[total / batch];
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long t0 = System.nanoTime();
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ExecutorService ex = Executors.newFixedThreadPool(threads);
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List<Future<?>> fs = new ArrayList<>();
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for (int t = 0; t < threads; t++) fs.add(ex.submit(() -> {
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try {
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while (true) {
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int n = done.incrementAndGet();
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if (n > total) return null;
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c.send(rq, HttpResponse.BodyHandlers.discarding());
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if (n % batch == 0) batchEnd[n / batch - 1] = System.nanoTime();
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}
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} catch (Exception e) { throw new RuntimeException(e); }
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}));
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for (Future<?> f : fs) f.get();
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ex.shutdown();
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StringBuilder sb = new StringBuilder("batch ms:");
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long prev = t0;
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for (long e : batchEnd) { sb.append(' ').append((e - prev) / 1_000_000); prev = e; }
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System.out.println(sb);
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System.out.println("total ms: " + (prev - t0) / 1_000_000);
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}
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}
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