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rpgreen/Latency.java

Last active December 10, 2018 19:33
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A simple script to measure API Gateway endpoint latency. Requires Apache HttpComponents
Raw
Latency.java
@Test
public void testPerf() throws IOException {
final HttpGet request = new HttpGet("https://11ro68yamg.execute-api.us-east-1.amazonaws.com/prod/lambda");
final int numRequests = 10000;
final int[] histogram = new int[100];
final List<Integer> latencies = new ArrayList<>();
final CloseableHttpClient client = HttpClients.createDefault();
for (int i = 0; i < numRequests; i++) {
final Stopwatch sw = Stopwatch.createStarted();
final CloseableHttpResponse resp = client.execute(request);
resp.close();
sw.stop();
long millis = sw.elapsed(TimeUnit.MILLISECONDS);
if (millis > 800) {
LOG.warn(String.format("Request took %dms" + ", request ID: %s, CF request ID: %s", millis,
resp.getFirstHeader("X-Amzn-Requestid"), resp.getFirstHeader("X-Amz-Cf-Id")));
}
histogram[((int) (millis / 100))]++;
latencies.add((int) millis);
}
Collections.sort(latencies);
final int p50 = latencies.get((50 * (numRequests) / 100) - 1);
final int p90 = latencies.get((90 * (numRequests) / 100) - 1);
final int p99 = latencies.get((99 * (numRequests) / 100) - 1);
final int p100 = latencies.get((100 * (numRequests) / 100) - 1);
LOG.info(String.format("Num requests: %d P50: %dms P90: %dms P99: %dms P100: %dms", numRequests, p50, p90, p99, p100));
LOG.info(String.format("Distribution: "));
for (int i = 0; i < histogram.length; i++) {
LOG.info(i*100 + "ms - " + (i+1)*100 + "ms: " + histogram[i]);
}
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