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Fix cards stalling out on degenerate flames

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Steven Robertson 2011-10-29 11:14:11 -04:00
parent 6204f36ebc
commit 0936e34b88
1 changed files with 5 additions and 6 deletions
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11
cuburn/code/iter.py
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@ -391,7 +391,11 @@ void iter(uint64_t accbuf_ptr, mwc_st *msts, float4 *points,
}
int num_okay = __popc(__ballot(fuse_rounds == 0.0f));
if (threadIdx.x == 0) atomicSub(&nsamps, num_okay * 32);
// Some xforms give so many badvals that a thread is almost guaranteed
// to hit another badval before the fuse is over, causing the card to
// spin forever. To avoid this, we count a fuse round as 1/4 of a
// sample below.
if (threadIdx.x == 0) atomicSub(&nsamps, 256 + num_okay * 24);
fuse_rounds = fmaxf(0.0f, fuse_rounds - 1.0f);
__syncthreads();
@ -406,11 +410,6 @@ void iter(uint64_t accbuf_ptr, mwc_st *msts, float4 *points,
points[this_rb_idx] = make_float4(x, y, color, fuse_rounds);
msts[this_rb_idx] = rctx;
return;
/*if (rctx.state == 0xffffffff && rctx.carry == 0xffffffff) {
printf("Warning: runaway sequence, multiplier %8x.\n", rctx.mul);
rctx.state = gtid();
}*/
}
''')
return tmpl.substitute(