Hitting X limit in launching maximum number of vkcube instances

[Anuj Phogat]

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?

Thanks
Anuj

On Fri, May 5, 2023 at 2:55 PM Adam Jackson <ajax at redhat.com> wrote:

> No, just MAXCLIENTS. Probably vkcube (or the driver it's using) should
> fail more robustly when it can't connect to the display, instead of letting
> you render without presenting though.
>
> On Fri, May 5, 2023 at 5:28 PM Anuj Phogat <anuj.phogat at gmail.com> wrote:
>
>> Hi All,
>>
>> I've been trying to run the maximum number of instances of vkcube (Vulkan
>> application)
>> in Ubuntu 22.04. I'm hitting one of these X errors when I get past ~256
>> instances:
>> - "Maximum number of clients reached"
>> - "_XSERVTransSocketUNIXAccept: accept() failed"
>>
>> I was able to get past these errors by adding below code in xorg conf
>> file passed to Xorg
>> using '-config' option:
>> Section "ServerFlags"
>>     Option "MaxClients" "512"
>> EndSection
>>
>> Now I'm not seeing X errors about the limit but X windows past the 256
>> limit don't render
>> anything. Do I need to adjust any other limits (other than MAXCLIENTS) to
>> make instances
>> past 256 limit render as expected ? I would appreciate any pointers to
>> help me debug and
>> resolve this issue.
>>
>> Adding Adam and Olivier in Cc as I noticed a few old patches from them
>> around changing
>> MAXCLIENTS.
>>
>> Thanks
>> Anuj
>>
>
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