<div dir="ltr">I'm sure you're right (assuming the GUI tool still exists... the top answer is quite old.)  Mainly I linked to the answer since it seems to cover a spectrum of approaches which might Eliot might find useful.</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Sep 14, 2019 at 12:52 AM Nicola Mingotti <<a href="mailto:nmingotti@gmail.com">nmingotti@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
  
    
  
  <div bgcolor="#FFFFFF">
    <br>
    With high probability that GUI-tool is a wrapper to 'dummynet'.
    Anyhow, for sure it will be faster to deploy. <br>
    <br>
    n.<br>
    <br>
    <br>
    <div class="gmail-m_3955315540927127760moz-cite-prefix">On 9/13/19 9:32 PM, Phil B wrote:<br>
    </div>
    <blockquote type="cite">
      
      <div dir="ltr">It sounds like simulating a terrible (dropping
        packets) or painfully slow (kbps speeds) network connection
        might be a more controlled way to reproduce the issue:  <a href="https://apple.stackexchange.com/questions/24066/how-to-simulate-slow-internet-connections-on-the-mac" target="_blank">https://apple.stackexchange.com/questions/24066/how-to-simulate-slow-internet-connections-on-the-mac</a></div>
      <br>
      <div class="gmail_quote">
        <div dir="ltr" class="gmail_attr">On Fri, Sep 13, 2019 at 11:16
          PM Eliot Miranda <<a href="mailto:eliot.miranda@gmail.com" target="_blank">eliot.miranda@gmail.com</a>>
          wrote:<br>
        </div>
        <blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"> 
          <div dir="ltr">
            <div dir="ltr">
              <div dir="ltr">
                <div dir="ltr">
                  <div dir="ltr">Hi All,<br>
                    <div><br>
                    </div>
                    <div>    there is a VM bug in 64-bit Spur with the
                      Sista V1 bytecode set and full blocks.  The
                      symptom is that when waiting for a remote
                      Monticello repository to update and/or deliver a
                      package version the system crashes in JITTED code
                      after what appears to be some kind of wait.</div>
                    <div><br>
                    </div>
                    <div>This is a reliably occurring bug b ut
                      maddeningly difficult to reproduce.  The bug
                      reliably occurs when interacting with a remote
                      rep[ository (e.g. <a href="http://source.squeak.org/VMMaker" target="_blank">http://source.squeak.org/VMMaker</a>)
                      when the server is "cold", and hence makes the
                      image wait.  Every time I have tried to repeat the
                      failing sequence the crash has not occurre3d, I
                      think because the server is now "hot" and serves
                      up the version quickly.  Today I even tried
                      shutting down my machine for over an hour and
                      rebooting.  But I could not get the crash to occur
                      even though it seems to me that every time I try
                      it the first time in the4 day it does crash.</div>
                    <div><br>
                    </div>
                    <div>This is an important bug to fix.  If it cannot
                      be fixed then full blocks and Sista V1 are not
                      ready for use in the upcoming Squeak release.  I
                      am looking for help in debugging this.</div>
                    <div><br>
                    </div>
                    <div>- is anyone else uising the 64-bit VM with full
                      blocks and Sista V1 who sees hard VM crashes?  If
                      so, under what circumstances?</div>
                    <div><br>
                    </div>
                    <div>- is it possible to flush caches in the <a href="http://source.squeak.org/VMMaker" target="_blank">http://source.squeak.org/VMMaker</a>
                      server, or could people tolerate me rebooting the
                      server?</div>
                    <div><br>
                    </div>
                    <div>- is there a way of introducing network delays
                      in Mac OS that might help me induce the bug?</div>
                    <div><br>
                    </div>
                    <div>- can anyone think of any other strategies I
                      might take to try and reproduce this?</div>
                    <div><br>
                    </div>
                    <div>I may have to try and reproduce e the bug in
                      the simulator to have a chance of identifying the
                      bug.  Does anyone have a good enough mental model
                      of the Monticello server interaction and have
                      energy to help me figure this one out?</div>
                    <div><br>
                    </div>
                    <div>Here is some information from the last crash I
                      did see in the debugger (alas it is incomplete;
                      there are a number of additional pieces of info I
                      could have collected).</div>
                    <div><br>
                    </div>
                    <div>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica">(lldb)
                        thr b</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica">*
                        thread #1, queue = 'com.apple.main-thread', stop
                        reason = EXC_BAD_INSTRUCTION
                        (code=EXC_I386_INVOP, subcode=0x0)</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica"> 
                        * frame #0: 0x000000010de5700a</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica"> 
                          frame #1: 0x000000010dd7b174</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica"> 
                          frame #2: 0x000000010dd45f1c</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica"> 
                          frame #3: 0x000000010dd44534</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica"> 
                          frame #4: 0x000000010dd44c60</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica">(lldb)
                        x/10i 0x000000010de5700a</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica;min-height:14px"><br>
                      </p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica">(lldb)
                        call printStackCallStackOf($rbp)</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica"> 
                          0x7ffeefbdfc30 M Heap>upHeap: 0x11273ca90:
                        a(n) Heap</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica"> 
                          0x7ffeefbdfc68 M Heap>add: 0x11273ca90:
                        a(n) Heap</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica"> 
                          0x7ffeefbdfca0 M Delay
                        class>scheduleDelay:from: 0x1123ebfb8: a(n)
                        Delay class</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica"> 
                          0x7ffeefbdfcf0 M Delay
                        class>handleTimerEvent 0x1123ebfb8: a(n)
                        Delay class</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica"> 
                          0x7ffeefbdfd20 M Delay
                        class>runTimerEventLoop 0x1123ebfb8: a(n)
                        Delay class</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica;min-height:14px"><br>
                      </p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica">(lldb)
                        x/10i 0x000000010dd7b174</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica"> 
                          0x10dd7b174: 48 8b 55 10  movq   0x10(%rbp),
                        %rdx</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica"> 
                          0x10dd7b178: 48 89 ec     movq   %rbp, %rsp</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica"> 
                          0x10dd7b17b: 5d           popq   %rbp</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica"> 
                          0x10dd7b17c: c2 10 00     retq   $0x10</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica"> 
                          0x10dd7b17f: cc           int3</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica"> 
                          0x10dd7b180: cc           int3</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica"> 
                          0x10dd7b181: cc           int3</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica"> 
                          0x10dd7b182: cc           int3</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica"> 
                          0x10dd7b183: cc           int3</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica"> 
                          0x10dd7b184: cc           int3</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica">(lldb)
                        print whereIs(0x000000010dd7b174)</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica">(char
                        *) $0 = 0x00000001000f83ff " is in generated
                        methods"</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica"><span style="font-size:12px">(lldb) call
                          printCogMethodFor((void *)0x000000010dd7b174)</span><br>
                      </p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica">  
                            0x10dd7afc0 <->        0x10dd7b198:
                        method:        0x112f23c10 selector:       
                        0x112232c20 add:</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica">(lldb)
                        print whereIs(0x000000010de5700a)</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica">(char
                        *) $1 = 0x00000001000f83ff " is in generated
                        methods"</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica">(lldb)
                        call printCogMethodFor((void
                        *)0x000000010de5700a)</p>
                      <p style="margin:0px;font-stretch:normal;font-size:12px;line-height:normal;font-family:Helvetica">  
                            0x10de56ba0 <->        0x10de57078:
                        method:        0x1126ec218 prim 23856 selector:
                            0x7ffeefbf3d20</p>
                    </div>
                    <div><br>
                    </div>
                    <div>this method ends up being the fitted version of
                      Delay class>><span style="font-family:Helvetica;font-size:12px"> startTimerEventLoop</span></div>
                    <div dir="ltr" class="gmail-m_3955315540927127760gmail-m_7948985732391852149gmail_signature">
                      <div dir="ltr">
                        <div><span style="font-size:small;border-collapse:separate">
                            <div>_,,,^..^,,,_<br>
                            </div>
                            <div>best, Eliot</div>
                          </span></div>
                      </div>
                    </div>
                  </div>
                </div>
              </div>
            </div>
          </div>
        </blockquote>
      </div>
      <br>
      <fieldset class="gmail-m_3955315540927127760mimeAttachmentHeader"></fieldset>
      <pre class="gmail-m_3955315540927127760moz-quote-pre"></pre>
    </blockquote>
    <br>
  </div>

</blockquote></div>