bm_get_vpu_instant_usage不生效？

[imaben]

代码如下：

TEST_F(VPUTest, VPUUsage) {
    unsigned int card_num = 0;
    bm_status_t ret;
    ret = bm_get_card_num(&card_num);
    ASSERT_EQ(ret, BM_SUCCESS);
    std::cout << "Card num: " << card_num << std::endl;
    for (unsigned int i = 0; i < card_num; i++) {
        unsigned int chip_num = 0;
        unsigned int dev_start_index = 0;
        ret = bm_get_chip_num_from_card(i, &chip_num, &dev_start_index);
        if (ret != BM_SUCCESS) {
            std::cerr << "Error: Failed to get chip num from card " << i << ", skipping..." << std::endl;
            continue;
        }
        std::cout << "Card " << i << ": Chip num: " << chip_num << " Dev start index: " << dev_start_index << std::endl;
        for (unsigned int j = 0; j < chip_num; j++) {
            unsigned int dev_id = dev_start_index + j;
            bm_handle_t handle = nullptr;
            ret = bm_dev_request(&handle, dev_id);
            EXPECT_EQ(ret, BM_SUCCESS) << "Failed to request device " << dev_id;
            if (ret != BM_SUCCESS) {
                std::cerr << "Error: Failed to request device " << dev_id << ", skipping..." << std::endl;
                continue;
            }
            int vpu_usage = 0;
            ret = bm_get_vpu_instant_usage(handle, &vpu_usage);
            if (ret == BM_SUCCESS) {
                std::cout << "Device " << dev_id << " (Card " << i << ", Chip " << j << ") VPU usage: " << vpu_usage << std::endl;
            } else {
                std::cerr << "Error: Failed to get VPU usage for device " << dev_id << ", ret=" << ret << std::endl;
            }
            bm_dev_free(handle);
        }
    }
}

实际执行结果：

Card num: 8
Card 0: Chip num: 3 Dev start index: 0
Device 0 (Card 0, Chip 0) VPU usage: -1973305992
Device 1 (Card 0, Chip 1) VPU usage: -1973305992
Device 2 (Card 0, Chip 2) VPU usage: -1973305992
Card 1: Chip num: 3 Dev start index: 3
Device 3 (Card 1, Chip 0) VPU usage: -1973305992
Device 4 (Card 1, Chip 1) VPU usage: -1973305992
Device 5 (Card 1, Chip 2) VPU usage: -1973305992
Card 2: Chip num: 3 Dev start index: 6
Device 6 (Card 2, Chip 0) VPU usage: -1973305992
Device 7 (Card 2, Chip 1) VPU usage: -1973305992
Device 8 (Card 2, Chip 2) VPU usage: -1973305992
Card 3: Chip num: 3 Dev start index: 9
Device 9 (Card 3, Chip 0) VPU usage: -1973305992
Device 10 (Card 3, Chip 1) VPU usage: -1973305992
Device 11 (Card 3, Chip 2) VPU usage: -1973305992
Card 4: Chip num: 3 Dev start index: 12
Device 12 (Card 4, Chip 0) VPU usage: -1973305992
Device 13 (Card 4, Chip 1) VPU usage: -1973305992
Device 14 (Card 4, Chip 2) VPU usage: -1973305992
Card 5: Chip num: 3 Dev start index: 15
Device 15 (Card 5, Chip 0) VPU usage: -1973305992
Device 16 (Card 5, Chip 1) VPU usage: -1973305992
Device 17 (Card 5, Chip 2) VPU usage: -1973305992
Card 6: Chip num: 3 Dev start index: 18
Device 18 (Card 6, Chip 0) VPU usage: -1973305992
Device 19 (Card 6, Chip 1) VPU usage: -1973305992
Device 20 (Card 6, Chip 2) VPU usage: -1973305992
Card 7: Chip num: 3 Dev start index: 21
Device 21 (Card 7, Chip 0) VPU usage: -1973305992
Device 22 (Card 7, Chip 1) VPU usage: -1973305992
Device 23 (Card 7, Chip 2) VPU usage: -1973305992

看着usage完全不生效，每次取出来的数值都在变，像是内存随机值