v2 init error on MAC

[guoshengCS]

when executing paddle.init on MAC, following errors occurred:

Traceback (most recent call last):
  File "paddle_demo_final.py", line 63, in <module>
    paddle.init(use_gpu=False, trainer_count=1)
  File "/Users/baidu/build_doc/build_env/lib/python2.7/site-packages/paddle/v2/__init__.py", line 133, in init
    set_omp_mkl_env_vars(kwargs.get('trainer_count', 1))
  File "/Users/baidu/build_doc/build_env/lib/python2.7/site-packages/paddle/v2/__init__.py", line 105, in set_omp_mkl_env_vars
    num_cores = num_physical_cores()
  File "/Users/baidu/build_doc/build_env/lib/python2.7/site-packages/paddle/v2/__init__.py", line 95, in num_physical_cores
    return int(os.popen(cmds.get(platform.system(), "expr 1")).read())
ValueError: invalid literal for int() with base 10: 'hw.physicalcpu: 2\n'

It seems that os.popen(cmds.get(platform.system(), "expr 1") returns hw.physicalcpu: 2\n rather than an integer.

[luotao1]

related with #5801, @tensor-tang can you help to see it?

[NHZlX]

 File "infer.py", line 78, in <module>
    out = main()
  File "infer.py", line 26, in main
    paddle.init(use_gpu=False)
  File "/home/xingzhaolong/.jumbo/lib/python2.7/site-packages/paddle/v2/__init__.py", line 133, in init
    set_omp_mkl_env_vars(kwargs.get('trainer_count', 1))
  File "/home/xingzhaolong/.jumbo/lib/python2.7/site-packages/paddle/v2/__init__.py", line 105, in set_omp_mkl_env_vars
    num_cores = num_physical_cores()
  File "/home/xingzhaolong/.jumbo/lib/python2.7/site-packages/paddle/v2/__init__.py", line 86, in num_physical_cores
    os.popen("lscpu |grep \"Socket\" |awk -F':' '{print $2}'|xargs")
ValueError: invalid literal for int() with base 10: ''

i meet this on my develop machine(linux).

[Yancey1989]

What's the output with execute the command lscpu in the terminal?

[NHZlX]

Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                12
On-line CPU(s) list:   0-11
Thread(s) per core:    1
Core(s) per socket:    6
CPU socket(s):         2
NUMA node(s):          2
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 62
Stepping:              4
CPU MHz:               2100.178
BogoMIPS:              4206.46
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              15360K
NUMA node0 CPU(s):     0-5
NUMA node1 CPU(s):     6-11

[luotao1]

This is that socket in CPU socket(s) is lowercase letter, but in lscpu |grep \"Socket\" |awk -F':' '{print $2}'|xargs is uppercase letter.

[luotao1]

 num_sockets = int(
                os.popen("lscpu |grep \"Socket\" |awk -F':' '{print $2}'|xargs")
                .read())
 num_cores_per_socket = int(
                os.popen(
                    "lscpu |grep \"per socket\" |awk -F':' '{print $2}'|xargs")
                .read())
            return num_sockets * num_cores_per_socket

由于num_sockets和num_cores_per_socket都只用了一次，因此在使用grep的时候可以不区分大小写：

num_sockets, num_cores_per_socket = os.popen("lscpu | grep -i \"socket\" |awk -F':' '{print $2}'|xargs").read().strip('\n').split(" ")
return int(num_sockets) * int(num_cores_per_socket)

[tensor-tang]

写反了，应该是 num_cores_per_socket, num_sockets = os.popen(...)
或者这里就不用区分这个名字了。