failing to take a trace

[José Fonseca]

On Thu, Jan 12, 2012 at 9:40 AM, kalyan reddy <kalyanreddy2005 at gmail.com> wrote:
> Hi,
>
> I am a new user to api trace. I have been trying to get a trace out of
> chromium(when using webgl) on meego. I have used the following command :
>
> apitrace trace "..<apppath>/chromium-browser" --user-gl=egl
> --ignore-gpu-blacklist
> http:://webglsamples.googlecode.com/hg/field/field.html
>
> chromium is launched and I can see the fps and field page correctly. I close
> the browser and return to terminal. I cannot find any .trace file nor any
> errors are shown up. Any tips??
>
> reg,
> kalyan
>
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> apitrace at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/apitrace
>

There are several things to keep in mind here:
- chrome does a lot of inter-process comunnication, so it is important
to ensure that the renderer process is forked from the right parent
and actually gets the LD_PRELOAD environment variable. There are some
chrome options that help (--temp-profile --user-data-dir
--single-process)
- when tracing EGL you need to run apitrace trace --api egl ....

This works for me when using GL:

$ ./apitrace trace  --api gl chromium --temp-profile
--ignore-gpu-blacklist
http://webglsamples.googlecode.com/hg/field/field.html
apitrace: redirecting dlopen("libGL.so.1", 0x1)
apitrace: tracing to /home/jfonseca/projects/apitrace/chromium.2.trace
apitrace: warning: unknown function "glBindFragDataLocationIndexedARB"
apitrace: warning: unknown function "glBlitFramebufferANGLE"
apitrace: warning: unknown function "glEGLImageTargetTexture2DOES"
apitrace: warning: unknown function "glRenderbufferStorageMultisampleANGLE"
apitrace: redirecting dlopen("libGL.so.1", 0x102)
[3:3:555073509122:ERROR:nss_util.cc(394)] Error initializing NSS
without a persistent database: libsoftokn3.so: cannot open shared
object file: Permission denied
apitrace: redirecting dlopen("libGL.so.1", 0x1)
apitrace: tracing to /home/jfonseca/projects/apitrace/chromium.3.trace
apitrace: warning: unknown function "glBindFragDataLocationIndexedARB"
apitrace: warning: unknown function "glBlitFramebufferANGLE"
apitrace: warning: unknown function "glEGLImageTargetTexture2DOES"
apitrace: warning: unknown function "glRenderbufferStorageMultisampleANGLE"
apitrace: redirecting dlopen("libGL.so.1", 0x102)

And this *should* work for EGL:

$ ./apitrace trace  --api egl chromium --temp-profile --user-gl=egl
--ignore-gpu-blacklist
http://webglsamples.googlecode.com/hg/field/field.html

But by some reason chrome on my system refuses to use EGL, and always
uses GL, so it doesn't. But that's a chrome issue, and not apitrace's.

Jose