执行h2d、d2h偶现不达标，如下所示：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | ******# ascend-dmi --bw -t d2h -s 33554432 -d 1 -q Device to Host *** Device 1:xxxxx. ------------------------------------------------------------------------------ ID Size(Bytes) Execute Times Bandwidth(GB/s) Elapsed Time(us) ------------------------------------------------------------------------------ 1 33554432 40 20.438206 1641.75 ------------------------------------------------------------------------------ ******# ascend-dmi --bw -t d2h -s 33554432 -d 0 -q Device to Host *** Device 0:xxxxx. ------------------------------------------------------------------------------ ID Size(Bytes) Execute Times Bandwidth(GB/s) Elapsed Time(us) ------------------------------------------------------------------------------ 0 33554432 40 27.396825 1224.76 ------------------------------------------------------------------------------ ******# ascend-dmi --bw -t d2h -s 33554432 -d 2 -q Device to Host *** Device 2:xxxxx. ------------------------------------------------------------------------------ ID Size(Bytes) Execute Times Bandwidth(GB/s) Elapsed Time(us) ------------------------------------------------------------------------------ 2 33554432 40 20.070948 1671.79 ------------------------------------------------------------------------------ ******# ascend-dmi --bw -t d2h -s 33554432 -d 1 -q Device to Host *** Device 1:xxxxx. ------------------------------------------------------------------------------ ID Size(Bytes) Execute Times Bandwidth(GB/s) Elapsed Time(us) ------------------------------------------------------------------------------ 1 33554432 40 26.271698 1277.21 ------------------------------------------------------------------------------ |
OS系统缓存不足，导致无法申请连续内存，从而影响性能不达标。
清理缓存或重启环境。