gr-fosphor: error: work group size exceeds the maximum default value for the selected device (AMD HD 5450)
sipos.csaba at kvk.uni-obuda.hu
Fri Feb 27 12:47:05 UTC 2015
Thanks mate, with your patch its working all right :-)
With Tom, we talked about a feature wich would be nice to have: a 10ms trigger so we can see something like this:
What do you think about it?
----- Original Message -----
From: "Sylvain Munaut" <tnt at 246tnt.com>
To: "Sipos Csaba" <sipos.csaba at kvk.uni-obuda.hu>
Cc: osmocom-sdr at lists.osmocom.org, "Sylvain Munaut" <tnt at 246tnt.com>
Sent: Friday, February 27, 2015 11:19:06 AM
Subject: Re: gr-fosphor: error: work group size exceeds the maximum default value for the selected device (AMD HD 5450)
> I just compiled gr-fosphor on a PC equipped with a HD 5450 card, and when I try to run osmocom_fft -F I gut the following error:
> [+] Selected device: Cedar
> Build log for 'display.cl':
> "/tmp/OCL2287T8.cl", line 67: error: work group size exceeds the maximum
> default value for the selected device
> __attribute__((reqd_work_group_size(16, 16, 1)))
> 1 error detected in the compilation of "/tmp/OCL2287T8.cl".
> Frontend phase failed compilation.
Yes, that card only suppot 128 as a maximum work group size and
fosphor is written to use 256. I think this particular generation of
card is the only one that's new enough to support OpenCL but old
enough to not support WG of 256.
I did however write a patch to support it a while back and just never
bothered to clean it up (to select size dynamically depending on your
Try the attached patch and see if it works for you.
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