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    <p>Checking OpenJDK 6/7 sources it seems <code>-XX:+PrintGCDetails</code> is not flushing</p> <pre><code>TraceCPUTime::~TraceCPUTime() { if (_active) { bool valid = false; if (!_error) { double real_secs; // walk clock time double system_secs; // system time double user_secs; // user time for all threads double real_time, user_time, system_time; valid = os::getTimesSecs(&amp;real_time, &amp;user_time, &amp;system_time); if (valid) { user_secs = user_time - _starting_user_time; system_secs = system_time - _starting_system_time; real_secs = real_time - _starting_real_time; _logfile-&gt;print(" [Times: user=%3.2f sys=%3.2f, real=%3.2f secs] ", user_secs, system_secs, real_secs); } else { _logfile-&gt;print("[Invalid result in TraceCPUTime]"); } } else { _logfile-&gt;print("[Error in TraceCPUTime]"); } if (_print_cr) { _logfile-&gt;print_cr(""); } } } </code></pre> <p>and it's fixed in OpenJDK 8 thanks to this <a href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8004170" rel="nofollow">bug report</a>.</p> <pre><code>TraceCPUTime::~TraceCPUTime() { if (_active) { bool valid = false; if (!_error) { double real_secs; // walk clock time double system_secs; // system time double user_secs; // user time for all threads double real_time, user_time, system_time; valid = os::getTimesSecs(&amp;real_time, &amp;user_time, &amp;system_time); if (valid) { user_secs = user_time - _starting_user_time; system_secs = system_time - _starting_system_time; real_secs = real_time - _starting_real_time; _logfile-&gt;print(" [Times: user=%3.2f sys=%3.2f, real=%3.2f secs] ", user_secs, system_secs, real_secs); } else { _logfile-&gt;print("[Invalid result in TraceCPUTime]"); } } else { _logfile-&gt;print("[Error in TraceCPUTime]"); } if (_print_cr) { _logfile-&gt;print_cr(""); } _logfile-&gt;flush(); } } </code></pre> <p>Maybe it gets backported if someone files it against 6/7.</p>
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    1. COGreat answer! Based on that I check and found that: http://hg.openjdk.java.net/jdk7u/jdk7u/hotspot/rev/8e478700068f It seems they backported it to JDK7. Based on the date, I would say it's available starting from jdk7u12 or jdk7u13
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