GOSTSec/vanitygen
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Display a warning when used with low-difficulty patterns and -k.

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This commit is contained in:
samr7 2011-08-06 03:59:10 -07:00
parent dd2f5670e6
commit 216cb03c5c
1 changed files with 23 additions and 8 deletions
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31
oclvanitygen.c
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@ -1630,16 +1630,22 @@ vg_opencl_loop(vg_context_t *vcp, cl_device_id did, int safe_mode,
full_threads *= nthreads;
/*
* The work size should be set to a point of diminishing
* returns for the batch size of the heap_invert kernel.
* The work size selection is complicated, and the most
* important factor is the batch size of the heap_invert kernel.
* Each value added to the batch trades one complete modular
* inversion for four multiply operations.
* Selection of a work size depends on the throughput ratio of
* the multiply and modular inversion operations.
* inversion for four multiply operations. Ideally the work
* size would be as large as possible. The practical limiting
* factors are:
* 1. Available memory
* 2. Responsiveness and operational latency
*
* We take a naive approach and limit batch size to a point of
* sufficiently diminishing returns, hoping that responsiveness
* will be sufficient.
*
* The measured value for the OpenSSL implementations on my CPU
* is 80:1. This causes heap_invert to break even with batches
* of 20, and receive 10% incremental returns at 200. The CPU
* is 80:1. This causes heap_invert to get batches of 20 or so
* for free, and receive 10% incremental returns at 200. The CPU
* work size is therefore set to 256.
*
* The ratio on most GPUs with the oclvanitygen implementations
@ -1673,7 +1679,7 @@ vg_opencl_loop(vg_context_t *vcp, cl_device_id did, int safe_mode,
* multiplier or fill available memory.
*/
wsmult = 1;
while ((!worksize || (wsmult < worksize)) &&
while ((!worksize || ((wsmult * 2) < worksize)) &&
((ncols * nrows * 2 * 128) < memsize) &&
((ncols * nrows * 2 * 64) < allocsize)) {
if (ncols > nrows)
@ -1714,6 +1720,15 @@ vg_opencl_loop(vg_context_t *vcp, cl_device_id did, int safe_mode,
goto out;
}
if (!vcp->vc_remove_on_match &&
(vcp->vc_chance >= 1.0f) &&
(vcp->vc_chance < round) &&
(vcp->vc_verbose > 0)) {
printf("WARNING: low pattern difficulty\n");
printf("WARNING: better match throughput is possible "
"using vanitygen on the CPU\n");
}
nslots = 2;
slot = 0;
vocp->voc_ocl_rows = nrows;