我是python的新手，我正在学习线程和GIL。
这些是@import url(http://fonts.googleapis.com/css?family=Open+Sans:400,600,300);
@charset "UTF-8";
/* Base Styles */
#cssmenu,
#cssmenu ul,
#cssmenu li,
#cssmenu a {
margin: 0;
padding: 0;
border: 0;
list-style: none;
font-weight: normal;
direction: rtl;
line-height: 1.5;
font-family: tahoma, "Helvetica Neue", "Lucida Grande", sans-serif;
font-size: 14px;
position: relative;
}
#cssmenu {
width: 750px;
background: #fff;
-webkit-border-radius: 4px;
-moz-border-radius: 4px;
border-radius: 4px;
padding: 3px;
-moz-box-shadow: 0 0 5px rgba(0, 0, 0, 0.6);
-webkit-box-shadow: 0 0 5px rgba(0, 0, 0, 0.6);
box-shadow: 0 0 5px rgba(0, 0, 0, 0.6);
direction: rtl;
}
#cssmenu > ul > li {
margin: 0 0 2px 0;
}
#cssmenu > ul > li:last-child {
margin: 0;
}
#cssmenu > ul > li > a {
font-size: 15px;
display: block;
color: #ffffff;
text-shadow: 0 1px 1px #000;
background: #565656;
background: -moz-linear-gradient(#565656 0%, #323232 100%);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #565656), color-stop(100%, #323232));
background: -webkit-linear-gradient(#565656 0%, #323232 100%);
background: linear-gradient(#565656 0%, #323232 100%);
border: 1px solid #000;
-webkit-border-radius: 4px;
-moz-border-radius: 4px;
border-radius: 4px;
}
#cssmenu > ul > li > a > span {
display: block;
border: 1px solid #666666;
padding: 6px 10px;
-webkit-border-radius: 4px;
-moz-border-radius: 4px;
border-radius: 4px;
font-weight: bold;
}
#cssmenu > ul > li > a:hover {
text-decoration: none;
}
#cssmenu > ul > li.active {
border-bottom: none;
}
#cssmenu > ul > li.active > a {
background: #97be10;
background: -moz-linear-gradient(#97be10 0%, #79980d 100%);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #97be10), color-stop(100%, #79980d));
background: -webkit-linear-gradient(#97be10 0%, #79980d 100%);
background: linear-gradient(#97be10 0%, #79980d 100%);
color: #fff;
text-shadow: 0 1px 1px #000;
border: 1px solid #79980d;
}
#cssmenu > ul > li.active > a span {
border: 1px solid #97be10;
}
#cssmenu > ul > li.has-sub > a span {
background: url(images/icon_plus.png) 2% center no-repeat;
}
#cssmenu > ul > li.has-sub.active > a span {
background: url(images/icon_minus.png) 2% center no-repeat;
}
/* Sub menu */
#cssmenu ul ul {
padding: 5px 12px;
display: none;
}
#cssmenu ul ul li {
padding: 3px 0;
}
#cssmenu ul ul a {
display: block;
color: #595959;
font-size: 13px;
font-weight: bold;
}
#cssmenu ul ul a:hover {
color: #79980d;
}
#borderimg1 {
border: 10px solid red;
padding: 15px;
-webkit-border-image: url(border.png) 30 round;
/* Safari 3.1-5 */
-o-border-image: url(border.png) 30 round;
/* Opera 11-12.1 */
//border-image: url(border.png) 30 round;
}
.divstyyle {
direction: rtl;
text-align: justify;
}命令的统计信息：
lscpu当我运行这个简单的python线程示例时，我得到以下输出。
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 4
On-line CPU(s) list: 0-3
Thread(s) per core: 2
Core(s) per socket: 2
Socket(s): 1
NUMA node(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 69
Stepping: 1
CPU MHz: 1700.062
BogoMIPS: 4789.05
Virtualization: VT-x
L1d cache: 32K
L1i cache: 32K
L2 cache: 256K
L3 cache: 3072K
NUMA node0 CPU(s): 0-3
但是当我禁用3个内核并重新运行代码时：
import time
import threading
def counter(n):
for i in range(0,n):
i = i+1
return
t1 = threading.Thread(target=counter, args = (10000000,))
t2 = threading.Thread(target=counter, args = (10000000,))
t0 = time.clock()
t1.start()
t2.start()
t1.join()
t2.join()
t3 = time.clock()
print "Total time : %s"%str(t3-t0)
bash@bash:~/Desktop$ python threads.py
Total time : 2.115326
这些数字或多或少保持不变。为什么会这样？有人解释。提前谢谢......