Andrew Haley

An ultra-lightweight high-precision logger for OpenJDK

By Andrew Haley June 24, 2014August 30, 2016

I had an interesting question from one of our developers here at Red Hat:

“When I was investigating a performance issue in our project after switched to oracle’s jdk7u40, I found a performance regression in class sun.net.www.protocl.http.HttpURLConnection.getOutputStream(). This method takes more cpu time than with jdk7u25.”

And it does, much more time. In fact, when fixedLengthStreamingMode is enabled HttpURLConnection.getOutputStream() takes ten times as long: about 1.2 milliseconds versus 47 microseconds.