[ltt-dev] Events lost

[Matthew Khouzam]

On 11-01-17 11:17 AM, Alessandro Morari wrote:
>
> Hi all,
>
> I'm using LTTng ( kernel 2.6.29.1) and LTTV ( 0.12.20) to obtain 
> traces of an application running in a Blue Gene/P system.
> This is a run with 4 cores for each node. When running "LTTV -m 
> textDump ..." to process the traces I get the following message:
>
> ** (process:1002): WARNING **: 1842089 events lost so far in tracefile 
> trace116/net_2 at block 90
>
> Do you know how can I avoid this events to be lost and this message to 
> appear?
>


The message is very important, you don't want to lose it.

As for not getting it, you probably busted your buffer size.
trace116/net_2 <- this means that net of cpu3 had a buffer overrun.

The way I avoid that is by giving each channel more buffers.
  lttctl -C -o channel.net.bufsize=$((1<<23))  something like this 
should help a lot.

>
> Thank you,
>
> Alessandro
>
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