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<p style="margin-top:0;margin-bottom:0">Hi Doug & Efficios,</p>
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<p style="margin-top:0;margin-bottom:0">I suspect the issue is with libbabeltrace-ctf. When opening the trace in Trace Compass, it failed saying the sequence was 2gb big. When opening in babeltrace, it OOMed with 2gb allocations. When opening with a hex editor,
I saw 2gb allocations.</p>
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<p style="margin-top:0;margin-bottom:0">On another subject, fixing the trace made it scale well in both babeltrace and Trace Compass.</p>
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<p style="margin-top:0;margin-bottom:0">I don't know why, data_length writes the wrong data. Hope this helps all parties.</p>
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<p style="margin-top:0;margin-bottom:0">BR,</p>
<p style="margin-top:0;margin-bottom:0">Matthew<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> tracecompass-dev-bounces@eclipse.org <tracecompass-dev-bounces@eclipse.org> on behalf of Doug Schaefer <dschaefer@blackberry.com><br>
<b>Sent:</b> Tuesday, March 12, 2019 2:50:29 PM<br>
<b>To:</b> jonathan.rajotte-julien@efficios.com<br>
<b>Cc:</b> lttng-dev@lists.lttng.org; tracecompass-dev@eclipse.org<br>
<b>Subject:</b> Re: [tracecompass-dev] [lttng-dev] Scalability</font>
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<div>I have attached the C file for a generator that creates a trace that reproduces the memory issue with babeltrace. The same issue happens with a custom program in the call to add a trace to a context.</div>
<div><br>
</div>
<div>I am using babeltrace that I get from my Ubuntu 18.04 distro. It has the version number 1.5.5.</div>
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<div>Thanks for the help!</div>
<div><br>
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<div>On Tue, 2019-03-12 at 15:47 +0000, Doug Schaefer wrote:</div>
<blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid; padding-left:1ex">
<div>In the thread on the tracecompass list, I also mentioned that the babeltrace utility itself ran out of memory when reading the file. That's actually my biggest worry. I got around the generator issue by flushing every 100K events.</div>
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<div>I'll create a quick generator that shows the same issue and post it in a bit.</div>
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<div>Doug.</div>
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<div>On Tue, 2019-03-12 at 11:34 -0400, Jonathan Rajotte-Julien wrote:</div>
<blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid; padding-left:1ex">
<pre>On Tue, Mar 12, 2019 at 03:23:23PM +0000, Doug Schaefer wrote:</pre>
<pre></pre>
<pre>It should be easy to generate a random one with the class I mentioned below</pre>
<pre>and fill it with 16 million events.</pre>
<pre><br></pre>
<pre>Not if the problem is in the generator code ;).</pre>
<pre><br></pre>
<pre></pre>
<pre>BTW, two of the int fields are 5 and 10</pre>
<pre>bits respectively, but I'm not sure that matters (or at least it shouldn't).</pre>
<pre><br></pre>
<pre>Make sure to check the endian-ness of those fields.</pre>
<pre><br></pre>
<pre>What class? Not sure I see any reference to any.</pre>
<pre><br></pre>
<pre>Since you are generating CTF the error can be in the generator code. Please</pre>
<pre>provide either a trace reproducing the issue or a base reproducer. It will be</pre>
<pre>much easier overall than us trying to reproduce it blindly.</pre>
<pre><br></pre>
<pre>Cheers.</pre>
<pre><br></pre>
</blockquote>
<pre>_______________________________________________</pre>
<pre>lttng-dev mailing list</pre>
<pre><a href="mailto:lttng-dev@lists.lttng.org">lttng-dev@lists.lttng.org</a></pre>
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