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<br><div><div>On Nov 4, 2013, at 1:48 PM, Dun Peal <<a href="mailto:dunpealer@gmail.com">dunpealer@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div dir="ltr"><div class="gmail_default" style="font-family:'courier new',monospace">In my case, it's a vector of vectors of pairs of ints, i.e. vector<vector<pair<int,int>>>.</div><div class="gmail_default" style="font-family:'courier new',monospace">
<br></div><div class="gmail_default" style="font-family:'courier new',monospace">I'm not sure what "a sample of lldb taken while it's sitting there" means. Sorry, I'm an LLVM newbie.</div><div class="gmail_default" style="font-family:'courier new',monospace">
<br></div></div></blockquote><div><br></div><div>If you are on OSX, it simply means typing <b>sample lldb</b> at a bash prompt :)</div><div>It will periodically look at the state of LLDB and generate a report of what is most likely taking up all that time</div><div><br></div><div>On Linux/Windows/.. I suppose there are equivalent facilities. Google is your friend. A process sample has nothing to do with LLVM specifically.</div><br><blockquote type="cite"><div dir="ltr"><div class="gmail_default" style="font-family:'courier new',monospace">I have reproduced the problem with minimal code, posted below. Two interesting observations:</div><div class="gmail_default" style="font-family:'courier new',monospace">
<br></div><div class="gmail_default" style="font-family:'courier new',monospace">1) For some reason, lldb prints each vector<pair<int,int>> as:</div><div class="gmail_default" style="font-family:'courier new',monospace">
<br></div><div class="gmail_default"><div class="gmail_default"><font face="courier new, monospace"> [0] = size=4294967295 {</font></div><div class="gmail_default"><font face="courier new, monospace"> [0] = (first = 0, second = 1)</font></div>
<div class="gmail_default"><font face="courier new, monospace"> [1] = (first = 1, second = 2)</font></div><div class="gmail_default"><font face="courier new, monospace"> [2] = (first = 2, second = 3)</font></div><div class="gmail_default">
<font face="courier new, monospace"> [3] = (first = 3, second = 4)</font></div><div class="gmail_default"><font face="courier new, monospace"> ...</font></div><div class="gmail_default"><font face="courier new, monospace"> } </font></div>
<div style="font-family:'courier new',monospace"><br></div><div style="font-family:'courier new',monospace">Since each of those vectors is exactly 4 pairs, it is printed in its entirety, so I'm not sure why there's an ellipsis there.</div>
<div style="font-family:'courier new',monospace"><br></div></div></div></blockquote><div><br></div><div>It looks like something is wrong with this data structure and we believe its size to be the large number</div><div>That value is not just a placeholder, it’s how many elements LLDB actually thinks are in the vector!</div><div>Most likely we end up realizing those are not valid and so we omit printing them, but we still believe they exist, and since you likely asked to see all of them, we are trying to create 4 billion elements and failing. Here your 300 seconds</div><div>Why we end up with malformed data like that is an interesting question. I will try to repro</div><br><blockquote type="cite"><div dir="ltr"><div class="gmail_default"><div style="font-family:'courier new',monospace">2) The times I quoted above are surprisingly preserved with this sample code. For example, printing the first 256 elements is still about 8 seconds. Printing all 300 elements, which is only about 20% more, takes 300 seconds, i.e. almost x40 the time! Curious.</div>
<div style="font-family:'courier new',monospace"><br></div><div><div><font face="courier new, monospace">#include <iostream></font></div><div><font face="courier new, monospace">#include <vector></font></div>
<div><font face="courier new, monospace"><br></font></div><div><font face="courier new, monospace">using namespace std;</font></div><div><font face="courier new, monospace"><br></font></div><div><font face="courier new, monospace">int main() {</font></div>
<div><font face="courier new, monospace"> vector<vector<pair<int,int> > > vec;</font></div><div><font face="courier new, monospace"> for (int i=0; i < 300; ++i) {</font></div><div><font face="courier new, monospace"> vector<pair<int,int> > v;</font></div>
<div><font face="courier new, monospace"> for (int j=0; j < 4; ++j) {</font></div><div><font face="courier new, monospace"> v.push_back(make_pair(i+j, i+j+1));</font></div><div><font face="courier new, monospace"> }</font></div>
<div><font face="courier new, monospace"> vec.push_back(v);</font></div><div><font face="courier new, monospace"> }</font></div><div><font face="courier new, monospace"> return 0; // to reproduce, put a breakpoint in this line, and `p vec`</font></div>
<div><font face="courier new, monospace">}</font></div></div></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Nov 4, 2013 at 12:49 PM, Enrico Granata <span dir="ltr"><<a href="mailto:egranata@apple.com" target="_blank">egranata@apple.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div>Yes please. Possibly with a sample of lldb taken while it's sitting there.</div><div>From your email, it sounds like the repro case is just a vector of pairs of int and int, with about 400 elements. Is that all?</div>
<div><br>Sent from the iPhone of<div><i>Enrico Granata</i> <egranata@🍎.com></div></div><div><div class="h5"><div><br>On Nov 4, 2013, at 12:42 PM, Dun Peal <<a href="mailto:dunpealer@gmail.com" target="_blank">dunpealer@gmail.com</a>> wrote:<br>
<br></div><blockquote type="cite"><div dir="ltr"><div class="gmail_default" style="font-family:courier new,monospace">Thanks! This works, though surprisingly slow; I just printed a vector<vector<pair<int,int>>> of 384 elements, and it blocked for about 390 seconds (6:30 minutes!) before rendering.</div>
<div class="gmail_default" style="font-family:courier new,monospace"><br></div><div class="gmail_default" style="font-family:courier new,monospace">The print only blocks for about 8 seconds when rendering the first 256 elements (i.e. without the settings change).</div>
<div class="gmail_default" style="font-family:courier new,monospace"><br></div><div class="gmail_default" style="font-family:courier new,monospace">This is LLDB 3.4 from the LLVM aptitude repo, running on a high end Xubuntu Linux 13.04 developer workstation.</div>
<div class="gmail_default" style="font-family:courier new,monospace"><br></div><div class="gmail_default" style="font-family:courier new,monospace">This is obviously a major usability issue for me with LLDB. Should I file a bug for this?</div>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Nov 4, 2013 at 10:05 AM, Greg Clayton <span dir="ltr"><<a href="mailto:gclayton@apple.com" target="_blank">gclayton@apple.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">(lldb) settings show target.max-children-count<br>
target.max-children-count (int) = 256<br>
(lldb) settings set target.max-children-count 10000<br>
<br>
<br>
You can then add this line to your ~/.lldbinit file if you want the setting to always be increased.<br>
<div><br>
<br>
On Nov 3, 2013, at 7:57 PM, Dun Peal <<a href="mailto:dunpealer@gmail.com" target="_blank">dunpealer@gmail.com</a>> wrote:<br>
<br>
> Hi,<br>
><br>
> When I do:<br>
><br>
> (lldb) p some_vector<br>
><br>
> It seems LLDB only actually prints the first 256 values. How do I get it to print the entire vector?<br>
><br>
> Thanks, D.<br>
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</blockquote></div><br></div>
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