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Throttle evictions to one w2r task at a time #763

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Throttle evictions to one w2r task at a time #763

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14 changes: 11 additions & 3 deletions parsec/mca/device/device_gpu.c
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@
#include "parsec/scheduling.h"

#include <limits.h>
#include <threads.h>

#define PARSEC_DEVICE_DATA_COPY_ATOMIC_SENTINEL 1024

Expand All @@ -39,6 +40,8 @@ static int parsec_gpu_profiling_initiated = 0;
int parsec_gpu_output_stream = -1;
int parsec_gpu_verbosity;

static thread_local int active_w2r_tasks = 0;

static inline int
parsec_device_check_space_needed(parsec_device_gpu_module_t *gpu_device,
parsec_gpu_task_t *gpu_task)
Expand Down Expand Up @@ -2596,9 +2599,13 @@ parsec_device_kernel_scheduler( parsec_device_module_t *module,

/* TODO: check this */
/* If we can extract data go for it, otherwise try to drain the pending tasks */
gpu_task = parsec_gpu_create_w2r_task(gpu_device, es);
if( NULL != gpu_task )
goto get_data_out_of_device;
if (active_w2r_tasks == 0) {
gpu_task = parsec_gpu_create_w2r_task(gpu_device, es);
if( NULL != gpu_task ) {
active_w2r_tasks++;
goto get_data_out_of_device;
}
}
}
gpu_task = progress_task;

Expand Down Expand Up @@ -2694,6 +2701,7 @@ parsec_device_kernel_scheduler( parsec_device_module_t *module,
PARSEC_LIST_ITEM_SINGLETON(gpu_task);
if (gpu_task->task_type == PARSEC_GPU_TASK_TYPE_D2HTRANSFER) {
parsec_gpu_complete_w2r_task(gpu_device, gpu_task, es);
active_w2r_tasks--;
gpu_task = progress_task;
goto fetch_task_from_shared_queue;
}
Expand Down
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