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<p class="MsoNormal"><span lang="EN-US">Hi erlangers,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Recently we have developed port (linked-in) driver and faced with some performance issues.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The port uses ERL_DRV_FLAG_USE_PORT_LOCKING locking mode, so as we understand calls to different port instances should have not blocked each other.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">SMP count is greater than 1.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">So the first question is: <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Is it possible to have multiple port instances executing time-consuming operation in parallel, i.e. at the same time?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">We expected port instances do not influence on each other. However, all the calls are blocked but the first one. So the scheduler thread seems to be blocked during the port instance invocation.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Is driver_async function required for the issues like above?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Is it possible to unblock the scheduler thread before erlang:port_call completes?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="color:black;mso-fareast-language:RU">Best Regards,<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="color:black;mso-fareast-language:RU">Sergey<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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