stream_utility.hpp Source File

stream_utility.hpp Source File#

Composable Kernel: stream_utility.hpp Source File

// SPDX-License-Identifier: MIT
// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
 
#pragma once
 
#include <hip/hip_runtime.h>
 
#include "ck/stream_config.hpp"
#include "ck/host_utility/hip_check_error.hpp"
 
static inline int getAvailableComputeUnitCount(const StreamConfig& stream_config)
{
    constexpr int MAX_MASK_DWORDS = 64;
 
    // assume at most 64*32 = 2048 CUs
    uint32_t cuMask[MAX_MASK_DWORDS];
 
    for(int i = 0; i < MAX_MASK_DWORDS; i++)
        cuMask[i] = 0;
 
    auto countSetBits = [](uint32_t dword) {
        int count = 0;
 
        while(dword != 0)
        {
            if(dword & 0x1)
                count++;
 
            dword = dword >> 1;
        };
 
        return (count);
    };
 
    hip_check_error(hipExtStreamGetCUMask(stream_config.stream_id_, MAX_MASK_DWORDS, &cuMask[0]));
 
    int ret = 0;
 
    for(int i = 0; i < MAX_MASK_DWORDS; i++)
        ret += countSetBits(cuMask[i]);
 
    return (ret);
};