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Increase GPU timing resolution to microsecond and add sanity check to ensure times are positive.

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This commit is contained in:
ckolivas 2012-06-26 12:50:52 +10:00
parent 999dba479a
commit dffda2382f
2 changed files with 16 additions and 13 deletions
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27
driver-opencl.c
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@ -1346,6 +1346,7 @@ static uint64_t opencl_scanhash(struct thr_info *thr, struct work *work,
struct cgpu_info *gpu = thr->cgpu;
_clState *clState = clStates[thr_id];
const cl_kernel *kernel = &clState->kernel;
const int dynamic_us = opt_dynamic_interval * 1000;
cl_int status;
size_t globalThreads[1];
@ -1359,21 +1360,23 @@ static uint64_t opencl_scanhash(struct thr_info *thr, struct work *work,
if (gpu->dynamic) {
struct timeval diff;
suseconds_t gpu_ms;
suseconds_t gpu_us;
timersub(&gpu->tv_gpuend, &gpu->tv_gpustart, &diff);
gpu_ms = diff.tv_sec * 1000 + diff.tv_usec / 1000;
gpu->gpu_ms_average = (gpu->gpu_ms_average + gpu_ms * 0.63) / 1.63;
gpu_us = diff.tv_sec * 1000 + diff.tv_usec;
if (likely(gpu_us > 0)) {
gpu->gpu_us_average = (gpu->gpu_us_average + gpu_us * 0.63) / 1.63;
/* Try to not let the GPU be out for longer than 6ms, but
* increase intensity when the system is idle, unless
* dynamic is disabled. */
if (gpu->gpu_ms_average > opt_dynamic_interval) {
if (gpu->intensity > MIN_INTENSITY)
--gpu->intensity;
} else if (gpu->gpu_ms_average < (float)opt_dynamic_interval / 2) {
if (gpu->intensity < MAX_INTENSITY)
++gpu->intensity;
/* Try to not let the GPU be out for longer than
* opt_dynamic_interval in ms, but increase
* intensity when the system is idle in dynamic mode */
if (gpu->gpu_us_average > dynamic_us) {
if (gpu->intensity > MIN_INTENSITY)
--gpu->intensity;
} else if (gpu->gpu_us_average < dynamic_us / 2) {
if (gpu->intensity < MAX_INTENSITY)
++gpu->intensity;
}
}
}
set_threads_hashes(clState->vwidth, &threads, &hashes, globalThreads,

2
miner.h
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@ -345,7 +345,7 @@ struct cgpu_info {
struct timeval tv_gpustart;;
struct timeval tv_gpuend;
double gpu_ms_average;
double gpu_us_average;
#endif
float temp;