Search perf OpenBLAS with OMP_WAIT_POLICY=PASSIVE

gistfile1.txt

OMP_WAIT_POLICY=PASSIVE ipython

Python 2.7.5 (default, Nov  6 2016, 00:28:07)
Type "copyright", "credits" or "license" for more information.

IPython 3.2.1 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object', use 'object??' for extra details.
execing pythonstartup.py

In [1]:

In [1]: import numpy as np

In [2]: import faiss
Failed to load GPU Faiss: No module named swigfaiss_gpu
Faiss falling back to CPU-only.

In [3]: import time

In [4]:

In [4]: # d = 160

In [5]: d = 128

In [6]: X = np.random.random((1000000, d)).astype('float32')

In [7]:

In [7]: index = faiss.IndexFlatL2(d)

In [8]:

In [8]: index.add(X)

In [9]:

In [9]: t0 = time.time(); index.search(X[:19], 20); print time.time() - t0
0.0814518928528

In [10]:

In [10]: t0 = time.time(); index.search(X[:20], 20); print time.time() - t0
0.398850917816

In [11]: t0 = time.time(); index.search(X[:20], 20); print time.time() - t0
0.389719963074

In [12]: t0 = time.time(); index.search(X[:20], 20); print time.time() - t0
0.384557008743

In [13]: t0 = time.time(); index.search(X[:20], 20); print time.time() - t0
^[[A0.414895057678

In [14]: t0 = time.time(); index.search(X[:20], 20); print time.time() - t0
0.394572973251

In [15]: t0 = time.time(); index.search(X[:20], 20); print time.time() - t0
0.402205944061

In [16]: t0 = time.time(); index.search(X[:20], 20); print time.time() - t0
0.437525987625