I am in the same shoes. Using GeForce GT 525M/PCIe/SSE2 and it is slower
than CPU. My understanding is that the big benefit of fast GPU is only
if the GPU is significantly faster because there is time lost when the
data is copied from RAM to the GPU.
You may find this info useful.
https://www.mail-archive.com/darktable-user@lists.darktable.org/msg01087.html
Regards,
B
On 2019-12-25 19:02, Аl Воgnеr wrote:
I wonder why an old pc with a GeForce 210, AMD Athlon II X2 270, 8G RAM
is slower using opencl.
darktable 2.6.3~git2.22c690a53
Fresh installation of the pc, using default darktable-configuration
$ darktable-cli bench.srw bench.srw.xmp bench.jpg --core -d perf -d
opencl
[opencl_init] device 0: GeForce 210
GLOBAL_MEM_SIZE: 1024MB
MAX_WORK_GROUP_SIZE: 512
MAX_WORK_ITEM_DIMENSIONS: 3
MAX_WORK_ITEM_SIZES: [ 512 512 64 ]
DRIVER_VERSION: 340.107
DEVICE_VERSION: OpenCL 1.0 CUDA
0.254144 [opencl_init] FINALLY: opencl is AVAILABLE on this system.
227,385925 [dev_process_export] pixel pipeline processing took 225,369
secs (165,316 CPU)
I do not find "blended on _G_PU" in the log. Log attached.
$ darktable-cli bench.srw bench.srw.xmp bench.jpg --core
--disable-opencl -d perf
76,490890 [dev_process_export] pixel pipeline processing took 74,577
secs (144,522 CPU)
BTW:
GeForce GT 1030: 17,770 secs (26,050 CPU) / 37,168 secs (281,707 CPU),
AMD FX-8320, 8G RAM
So with a GT 1030 it is getting about 2 times faster using opencl.
Al
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