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Latency Comparison Numbers (~2012) | |
---------------------------------- | |
L1 cache reference 0.5 ns | |
Branch mispredict 5 ns | |
L2 cache reference 7 ns 14x L1 cache | |
Mutex lock/unlock 25 ns | |
Main memory reference 100 ns 20x L2 cache, 200x L1 cache | |
Compress 1K bytes with Zippy 3,000 ns 3 us | |
Send 1K bytes over 1 Gbps network 10,000 ns 10 us | |
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD |
Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.
$ python -m SimpleHTTPServer 8000
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# Use this script to test that your Telegram bot works. | |
# | |
# Install the dependency | |
# | |
# $ gem install telegram_bot | |
# | |
# Run the bot | |
# | |
# $ ruby bot.rb | |
# |
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/* | |
* I add this to html files generated with pandoc. | |
*/ | |
html { | |
font-size: 100%; | |
overflow-y: scroll; | |
-webkit-text-size-adjust: 100%; | |
-ms-text-size-adjust: 100%; | |
} |
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package main | |
import ( | |
"fmt" | |
"io" | |
"log" | |
"net/http" | |
"os" | |
"time" | |
) |
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/* | |
A Tour of Go: page 44 | |
http://tour.golang.org/#44 | |
Exercise: Loops and Functions | |
As a simple way to play with functions and loops, implement the square root function using Newton's method. | |
In this case, Newton's method is to approximate Sqrt(x) by picking a starting point z and then repeating: z - (z*z - x) / (2 * z) |
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package main | |
import ( | |
"context" | |
"fmt" | |
"log" | |
"net/http" | |
"os" | |
"os/signal" | |
"strconv" |
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