Wrap PrintWriter with BufferedWriter #540
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| context.setContextPath("/"); | ||
| context.addServlet(new ServletHolder(new MetricsServlet()), "/metrics"); | ||
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| Server server = new Server(1234); |
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Do we actually need to run a HTTP server to test this?
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This hasn't been addressed.
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It's required since bottleneck is container-specific. For example, with Jetty 8.1.7 the bottleneck seems to be the ByteArrayBuffer instances. But with Jetty 9.4.27, ByteArrayBuffer is no longer an issue but another part of the code is consuming CPU cycles. In either case, the wrapper patch improved the performance by approximately the same amount.
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Can we at least bind to 0 so we don't clash with any existing listeners?
Signed-off-by: Takanori Takase <scm@after-sunrise.com>
Signed-off-by: Takanori Takase <scm@after-sunrise.com>
Signed-off-by: Takanori Takase <scm@after-sunrise.com>
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Signed-off-by: Takanori Takase <scm@after-sunrise.com>
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Thanks! |
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Thanks for the review & merge :) |
This was referenced Mar 11, 2021
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Hi @brian-brazil,
Generating servlet output for a large number of metrics seems to be inefficient, since the underlying
PrintWriterimplementation is generating too manyorg.eclipse.jetty.io.ByteArrayBufferinstances.Performance improved by simply wrapping the
PrintWriterwithBufferedWriter. Microbenchmark (ExampleBenchmark, 10k gauges, 100 iterations, laptop machine) shows that it takes around 2.5 sec with the wrapper, and around 5.5 sec without the wrapper.