Hi Olivier, Adam My apologies for the delayed response. I was pulled into something more urgent. Listing down my findings after experimentation based on your suggestions:
- I was earlier using x server version 1.21.1.4. I recently upgraded the version to 1.21.1.8. This upgrade fixed issues (dead windows and rendering) with launching kcalc instances past the 256 default max client limit. I tested launching 300 kcalc instances. - I'm still getting the "_XSERVTransSocketUNIXAccept: accept() failed" error after launching ~ 256 instances of vkcube. I was able to find the root cause of error after patching libxtrans based on Adam's suggestion: "_XSERVTransSocketUNIXAccept: accept() failed (Too many open files)" - Based on the hint from the error string, I changed the system wide limit to increase the maximum number of open files allowed from default 1024 to 'ulimit -n' confirmed the new limit. But, this change doesn't change the error past launching ~ 256 instances of vkcube. - I hit the same error but at ~330 instances when I try to run glxgears. Questions: What am I missing when changing the open files limit ? What else can I try to get past this error ? Should I reopen xserver issue [1] or create a new issue to track it ? [1] : https://gitlab.freedesktop.org/xorg/xserver/-/issues/1310 Thanks Anuj On Tue, May 23, 2023 at 1:41 AM Olivier Fourdan <ofour...@redhat.com> wrote: > > Hi > > On Thu, May 18, 2023 at 10:45 AM Anuj Phogat <anuj.pho...@gmail.com> wrote: > > > > On Sat, May 6, 2023 at 9:04 AM Alan Coopersmith > > <alan.coopersm...@oracle.com> wrote: > > > > > > On 5/5/23 16:07, Anuj Phogat wrote: > > > > Thanks for the quick response Adam. I've seen this behavior across > > > > multiple > > > > graphics applications > > > > and graphics drivers. This is an extreme use case I'm trying out. So, > > > > there's a > > > > possibility of this use > > > > case not being handled correctly by any of the applications or graphics > > > > drivers. > > > > But I also see some basic X functionality, like closing the window > > > > using the "x" > > > > button, not working > > > > properly with windows opened past the 256 limit. This happens with a > > > > modified > > > > limit of 512. I had to > > > > use xkill to close those windows. Any thoughts about this? > > > > > > Closing the window with the "x" button is a function of the window > > > manager. > > > Does the window manager you are using assume the number of X clients is > > > limited to 256? That xkill works suggests the X server is handling it > > > correctly. > > Alan, I took the window manager out of the equation by running multiple > > instances of vkcube with Xorg without running any window manager. > > Xorg.0.log file does show a log about set max clients through a .conf file: > > (**) Option "MaxClients" "512" > > > > But, I start seeing below error messages at the end of the log file once > > the number of vkcube instances go past 256: > > "_XSERVTransSocketUNIXAccept: accept() failed" > > > > Seems like the modified max clients limit of 512 is not getting configured > > correctly in X. > > > > What can I do to fix / debug this error ? > > I didn't find a mention of the actual version of the Xserver you're > running (not knowing what Ubuntu ships), but this may be relevant for > your issue: > > https://gitlab.freedesktop.org/xorg/xserver/-/issues/1310 > > Fixed with: > > https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/937 > > And backported to the 21.1 branch with: > > https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/953 > > HTH > > Cheers > > Olivier >