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jmap tool works only as root and output columns are not clear
Using jmap on Ubuntu Mate 18.04-64bits with Oracle JDK 10.0.1-64bits, the tool works only when running both the target and the tool as root, but using the same normal user for running both gives the following error:
<span class="typ" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #2b91af;"><code style="font-style: inherit; font-weight: inherit; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, sans-serif;"><span class="typ" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #2b91af;">Exception</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;"> in thread </span><span class="str" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #7d2727;">"main"</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;"> com</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">sun</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">tools</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">attach</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="typ" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #2b91af;">AttachNotSupportedException</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">:</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;"> </span><span class="typ" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #2b91af;">Unable</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;"> to open socket file </span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">/</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">proc</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">/</span><span class="lit" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #7d2727;">13538</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">/</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">cwd</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">/.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">attach_pid13538</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">:</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;"> target process </span><span class="lit" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #7d2727;">13538</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;"> doesn</span><span class="str" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #7d2727;">'</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">t respond within </span><span class="lit" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #7d2727;">10500ms</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;"> or </span><span class="typ" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #2b91af;">HotSpot</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;"> VM not loaded<br/>at jdk</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">attach</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">/</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">sun</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">tools</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">attach</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="typ" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #2b91af;">VirtualMachineImpl</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.<</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">init</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">>(</span><span class="typ" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #2b91af;">VirtualMachineImpl</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">java</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">:</span><span class="lit" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #7d2727;">103</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">)</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;"><br/>at jdk</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">attach</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">/</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">sun</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">tools</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">attach</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="typ" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #2b91af;">AttachProviderImpl</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">attachVirtualMachine</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">(</span><span class="typ" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #2b91af;">AttachProviderImpl</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">java</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">:</span><span class="lit" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #7d2727;">58</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">)</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;"><br/>at jdk</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">attach</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">/</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">com</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">sun</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">tools</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">attach</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="typ" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #2b91af;">VirtualMachine</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">attach</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">(</span><span class="typ" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #2b91af;">VirtualMachine</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">java</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">:</span><span class="lit" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #7d2727;">207</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">)</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;"><br/>at jdk</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">jcmd</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">/</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">sun</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">tools</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">jmap</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="typ" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #2b91af;">JMap</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">executeCommandForPid</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">(</span><span class="typ" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #2b91af;">JMap</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">java</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">:</span><span class="lit" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #7d2727;">124</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">)</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;"><br/>at jdk</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">jcmd</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">/</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">sun</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">tools</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">jmap</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="typ" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #2b91af;">JMap</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">main</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">(</span><span class="typ" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #2b91af;">JMap</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">.</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">java</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">:</span><span class="lit" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #7d2727;">114</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">)</span>
When using root user to run the following command <span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">jmap </span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">-</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">clstats </span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;"><</span><span class="pln" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">pid</span><span class="pun" style="font-style: inherit; font-weight: inherit; font-family: inherit; color: #303336;">></span>, everything works fine but I found some difficulties to understand the meaning of the output columns:
Is there any official documentation that explains the meaning of each column ?
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