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<p class="p1"><span class="s1"><span style="font-size:10.5pt">Hi,<o:p></o:p></span></span></p>
<p class="p1"><span class="s1"><span style="font-size:10.5pt"><o:p> </o:p></span></span></p>
<p class="p1"><span class="s1"><span style="font-size:10.5pt">I need to measure the memory usage of opt passes and have some questions in this regard.<o:p></o:p></span></span></p>
<p class="p1"><span class="s1"><span style="font-size:10.5pt"><o:p> </o:p></span></span></p>
<p class="p1"><span class="s1"><span style="font-size:10.5pt">First off, this does not really do anything;
</span></span><span style="font-size:10.5pt">is it a bug?<span class="s1"><o:p></o:p></span></span></p>
<p class="p1"><span class="s1"><span style="font-size:10.5pt"><o:p> </o:p></span></span></p>
<p class="p1"><span class="s1"><span style="font-size:10.5pt">$ clang -mllvm -time-passes -mllvm -track-memory -c -O3 ./p0.c</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Menlo"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Menlo">So, instead, I do:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Menlo"><o:p> </o:p></span></p>
<p class="p1"><span class="s1"><span style="font-size:10.5pt">$ clang -emit-llvm -O3 -c ./p0.c</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p>
<p class="p1"><span class="s1"><span style="font-size:10.5pt">$ opt -time-passes -track-memory ./p0.bc -O3 -o p0.O3.bc 2> p0.O3.txt</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Menlo"><o:p> </o:p></span></p>
<p class="p1"><span style="font-size:10.5pt">Which gets me the report I am looking for, however, I do not understand why there are negative numbers in the Mem column.<o:p></o:p></span></p>
<p class="p1"><span class="s1"><span style="font-size:10.5pt"><o:p> </o:p></span></span></p>
<p class="p1"><span class="s1"><span style="font-size:10.5pt">===-------------------------------------------------------------------------===</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p>
<p class="p1"><span class="apple-converted-space"><span style="font-size:10.5pt">                     
</span></span><span class="s1"><span style="font-size:10.5pt">... Pass execution timing report ...</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p>
<p class="p1"><span class="s1"><span style="font-size:10.5pt">===-------------------------------------------------------------------------===</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p>
<p class="p1"><span class="s1"><span style="font-size:10.5pt"><o:p> </o:p></span></span></p>
<p class="p1"><span class="s1"><span style="font-size:10.5pt">…<o:p></o:p></span></span></p>
<p class="p1"><span class="s1"><span style="font-size:10.5pt"><o:p> </o:p></span></span></p>
<p class="p1"><span class="s1"><span style="font-size:10.5pt">---User Time--- </span>
</span><span class="apple-converted-space"><span style="font-size:10.5pt">  </span>
</span><span class="s1"><span style="font-size:10.5pt">--User+System-- </span></span><span class="apple-converted-space"><span style="font-size:10.5pt"> 
</span></span><span class="s1"><span style="font-size:10.5pt">---Wall Time---</span></span><span class="apple-converted-space"><span style="font-size:10.5pt"> 
</span></span><span class="s1"><span style="font-size:10.5pt">---Mem---</span></span><span class="apple-converted-space"><span style="font-size:10.5pt"> 
</span></span><span class="s1"><span style="font-size:10.5pt">--- Name ---<o:p></o:p></span></span></p>
<p class="p1"><span class="apple-converted-space"><span style="font-size:10.5pt"></span></span><span class="s1"><span style="font-size:10.5pt">0.0010 ( 33.3%)
</span></span><span class="apple-converted-space"><span style="font-size:10.5pt"> 
</span></span><span class="s1"><span style="font-size:10.5pt">0.0010 ( 33.3%) </span>
</span><span class="apple-converted-space"><span style="font-size:10.5pt">  </span>
</span><span class="s1"><span style="font-size:10.5pt">0.0012 ( 41.2%) </span></span><span class="apple-converted-space"><span style="font-size:10.5pt">   
</span></span><span class="s1"><span style="font-size:10.5pt">324576</span></span><span class="apple-converted-space"><span style="font-size:10.5pt"> 
</span></span><span class="s1"><span style="font-size:10.5pt">Simplify the CFG</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p>
<p class="p1"><span class="s1"><span style="font-size:10.5pt">…<o:p></o:p></span></span></p>
<p class="p1"><span class="apple-converted-space"><span style="font-size:10.5pt"> </span></span><span class="s1"><span style="font-size:10.5pt">0.0000 (</span></span><span class="apple-converted-space"><span style="font-size:10.5pt"> 
</span></span><span class="s1"><span style="font-size:10.5pt">0.0%) </span></span><span class="apple-converted-space"><span style="font-size:10.5pt"> 
</span></span><span class="s1"><span style="font-size:10.5pt">0.0000 (</span></span><span class="apple-converted-space"><span style="font-size:10.5pt"> 
</span></span><span class="s1"><span style="font-size:10.5pt">0.0%) </span></span><span class="apple-converted-space"><span style="font-size:10.5pt"> 
</span></span><span class="s1"><span style="font-size:10.5pt">0.0000 (</span></span><span class="apple-converted-space"><span style="font-size:10.5pt"> 
</span></span><span class="s1"><span style="font-size:10.5pt">0.4%)</span></span><span class="apple-converted-space"><span style="font-size:10.5pt">     
</span></span><span class="s1"><span style="font-size:10.5pt">-7184</span></span><span class="apple-converted-space"><span style="font-size:10.5pt"> 
</span></span><span class="s1"><span style="font-size:10.5pt">Scalar Evolution Analysis</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p>
<p class="p1"><span style="font-size:10.5pt">…<o:p></o:p></span></p>
<p class="p1"><span style="font-size:10.5pt"><o:p></o:p></span></p>
<p class="p1"><span style="font-size:10.5pt"> Also, what are the units for the numbers in the Mem column?<o:p></o:p></span></p>
<p class="p1"><span style="font-size:10.5pt"><o:p> </o:p></span></p>
<p class="p1"><span style="font-size:10.5pt">I found the <span class="s1">-ftime-report option to clang; is there a similar way to request memory usage tracking of opt passes from clang?</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Menlo"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Menlo">Thank you,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Menlo">Anmol.<o:p></o:p></span></p>
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