这是一个创建于 4986 天前的主题，其中的信息可能已经有所发展或是发生改变。
According to http://www.cs.cornell.edu/projects/ladis2009/talks/dean-keynote-ladis2009.pdf
• L1 cache reference: 0.5 ns
• Branch mispredict: 5 ns
• L2 cache reference: 7 ns
• Mutex lock/unlock: 100 ns
• Main memory reference: 100 ns
• Compress 1K bytes with Zippy: 10,000 ns
• Send 2K bytes over 1 Gbps network: 20,000 ns
• Read 1 MB sequentially from memory: 250,000 ns
• Round trip within same datacenter: 500,000 ns
• Disk seek: 10,000,000 ns
• Read 1 MB sequentially from network: 10,000,000 ns
• Read 1 MB sequentially from disk: 30,000,000 ns
• Send packet CA->Netherlands->CA: 150,000,000 ns
• L1 cache reference: 0.5 ns
• Branch mispredict: 5 ns
• L2 cache reference: 7 ns
• Mutex lock/unlock: 100 ns
• Main memory reference: 100 ns
• Compress 1K bytes with Zippy: 10,000 ns
• Send 2K bytes over 1 Gbps network: 20,000 ns
• Read 1 MB sequentially from memory: 250,000 ns
• Round trip within same datacenter: 500,000 ns
• Disk seek: 10,000,000 ns
• Read 1 MB sequentially from network: 10,000,000 ns
• Read 1 MB sequentially from disk: 30,000,000 ns
• Send packet CA->Netherlands->CA: 150,000,000 ns
7 条回复 • 1970-01-01 08:00:00 +08:00
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1
willwen 2011-04-04 09:58:54 +08:00
这可以用超频调。。取决于性能。。
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2
Oliver 2011-04-04 10:59:11 +08:00
L1 Cache 的速度好快啊。寄存器的速度是否会更快，或者和 L1 Cache 持平？
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3
stranbird 2011-04-04 11:22:15 +08:00
寄存是硬件实现 显然很快啊。 L1就是用寄存器们来实现的。
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6
dogFish 2011-04-04 11:49:13 +08:00
错了, 是减少命中失败次数
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