<div dir="ltr">Thanks :)</div><div class="gmail_extra"><br><br><div class="gmail_quote">2014-08-27 13:30 GMT-04:00 Julien Desfossez <span dir="ltr"><<a href="mailto:jdesfossez@efficios.com" target="_blank">jdesfossez@efficios.com</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
<div><div class="h5"><br>
On 14-08-26 11:21 PM, Jessica Foest wrote:<br>
> Hi<br>
><br>
> i tried to retrieve system calls traces with all perf context parameters<br>
> . the problem is that only a few PERF counters are activated and lttng<br>
> fails to activate the other perf context parameters.<br>
> how can i solve it ?<br>
<br>
</div></div>There is a hardware limit on the number perf PMU counters that can be<br>
activated at the same time. It depends on the CPU and if you are on a<br>
virtual machine.<br>
If I remember correctly it is 3 or 4 on the i7.<br>
<span class="HOEnZb"><font color="#888888"><br>
Julien<br>
</font></span></blockquote></div><br></div>