r4m0n changed the topic of #kspmodders to: Technical discussion ONLY (KSP related or not), for random shit-talking, join #shitshow (seriously)
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<Orum>
sure would be nice if there was a way to tell /what/ resource you're running out of when you get CL_OUT_OF_RESOURCES
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<Orum>
you know you're doing (j)it right when you have 42 lines of CPP for 1 line of code
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<Orum>
Well, despite being a scalar arch, nVidia drivers still insist on loading every vector entirely into registers to perform calculation, leading to starvation... sigh
<angavrilov>
what kind of calculation
<Orum>
pythagorean theorm on 2 vectors, followed by normalization to 0:1
<angavrilov>
well, for one there are vector memory read and write operations
<angavrilov>
which transfer the whole vector in one memory transaction, so they improve memory efficiency
<Orum>
yeah, this should do read coalescing, I would think...
<Orum>
either way debugging this blindly sucks
<Orum>
I'll have to see what disassembly tools there are for compiled kernels for various platforms
<angavrilov>
does opencl has a way to compile it to ptx assembly like cuda to see what the frontend compiler does?
<Orum>
I know you can save compiled binaries, either to the intermediate SPIR-V or to the actual platform binary itself
<Orum>
but without something to disassemble it's kind of pointless
<angavrilov>
binaries are kinda proprietary and secret, so there probably aren't good disassemblers
<Orum>
damn :\
<angavrilov>
cuda has a hardware independent somewhat abstract ptx assembly representation, which is standardized and you can read it as text
<Orum>
I'll see if there's a way I can compile a kernel to that, would do wonders to see what is actually going on
<GlassYuri>
...if you install the latest version of unity on ten computers, you get like 15 different versions
<angavrilov>
it does have some abstractions like an infinite number of registers, which is then appropriately reduced when recompiling to binary in the driver
<Orum>
hrm, interesting...
<angavrilov>
but it provides a more low level view at what's going on compared to source code
<Orum>
it looks like you can compile to ptx with clang 3.0
<Orum>
problem is, who knows how different the code will be from nvidia's compiler
<Orum>
well, it's at least worth a shot
<Orum>
oh god, I missed inserting a letter when copying my other kernel... (╯°□°）╯︵ ┻━┻
<Orum>
so it had the wrong vector type
<Orum>
and now it barely squeaks by, but is probably horribly broken on anything not made in the last 2 years
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