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<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:34.8pt"><span lang="EN-US">In the sync case, the big buffer is retained in heap during the slow IO (until it eventually returns), even if it’s not needed anymore.</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:34.8pt"><span style="mso-fareast-language:FR"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:34.8pt"><span style="mso-fareast-language:FR">Are you sure you see an issue there once this code is warmed up? If so, are you running this in the IDE with the debugger (asking because the debugger need to access locals
will prevent the compiler from pruning locals).<br>
<br>
<br>
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:FR">I just execute the main() entry once _<i>without</i>_ debugger (from IDE).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:FR">I then check memory usage in VisualVM, and I force GC a few times to be sure memory is really retained.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:FR">The async app releases the big buffer but not the sync app. (The sync app releases memory if I uncomment the null assignment.)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:FR"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:FR">By warmed-up, you mean it has been JIT-ed? It’s a bit outside the control of a normal app, is it really supposed to have such an impact on object strong ref lifetime?
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:FR"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:FR">thanks<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:FR">Arnaud<o:p></o:p></span></p>
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