[lttng-dev] [tracecompass-dev] Scalability

[Doug Schaefer]

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.

I am using babeltrace that I get from my Ubuntu 18.04 distro. It has the version number 1.5.5.

Thanks for the help!

On Tue, 2019-03-12 at 15:47 +0000, Doug Schaefer wrote:
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.

I'll create a quick generator that shows the same issue and post it in a bit.

Doug.

On Tue, 2019-03-12 at 11:34 -0400, Jonathan Rajotte-Julien wrote:

On Tue, Mar 12, 2019 at 03:23:23PM +0000, Doug Schaefer wrote:

It should be easy to generate a random one with the class I mentioned below

and fill it with 16 million events.


Not if the problem is in the generator code ;).


BTW, two of the int fields are 5 and 10

bits respectively, but I'm not sure that matters (or at least it shouldn't).


Make sure to check the endian-ness of those fields.


What class? Not sure I see any reference to any.


Since you are generating CTF the error can be in the generator code. Please

provide either a trace reproducing the issue or a base reproducer. It will be

much easier overall than us trying to reproduce it blindly.


Cheers.


_______________________________________________

lttng-dev mailing list

lttng-dev at lists.lttng.org<mailto:lttng-dev at lists.lttng.org>

https://urldefense.proofpoint.com/v2/url?u=https-3A__lists.lttng.org_cgi-2Dbin_mailman_listinfo_lttng-2Ddev&d=DwICAg&c=yzoHOc_ZK-sxl-kfGNSEvlJYanssXN3q-lhj0sp26wE&r=NrrbvTHWa2Nbp_kAN0Hl1o3lM1WAwSes64uBjxjNhMc&m=DWwlFfl5FD5R8-HPY3GfbG6l6m7y_o2gXPER8IkQstk&s=bPK6X3vufUtEAemGpslNIlIL4UslBsgK-SWnraL-e9g&e=

---------------------------------------------------------------------
This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. Any use of this information by anyone other than the intended recipient is prohibited. If you have received this transmission in error, please immediately reply to the sender and delete this information from your system. Use, dissemination, distribution, or reproduction of this transmission by unintended recipients is not authorized and may be unlawful.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.lttng.org/pipermail/lttng-dev/attachments/20190312/25bd2322/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: scaletest.c
Type: text/x-csrc
Size: 5610 bytes
Desc: scaletest.c
URL: <https://lists.lttng.org/pipermail/lttng-dev/attachments/20190312/25bd2322/attachment-0001.c>