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Parsing huge logfiles in Node.js - read in line-by-line
... by line using stream & pipe. For testing I used a 2.1 gb file with 17.000.000 records. Ram usage did not exceed 60 mb.
First, install the event-stream package:
npm install event-stream
Then:
var fs = require('fs')
, es = require('event-stream');
var lineNr = 0;
var s = fs.createReadS...
R memory management / cannot allocate vector of size n Mb
...o have a matrix of the training data (up to 60 bands) and anywhere from 20,000 to 6,000,000 rows to feed to randomForest. Currently, I max out at about 150,000 rows because I need a contiguous block to hold the resulting randomForest object... Which is also why bigmemory does not help, as randomFore...
一个故事告诉你比特币的原理及运作机制 - 创意 - 清泛网 - 专注C/C++及内核技术
...知道，如果编号的每一个数字都是随机的，那么平均写1000多张幸运数字不同的纸才能获得一个有效的编号。
这就奇怪了，这些矿工为什么要拼命干这看似无意义的事情呢？还记得之前说过矿工有报酬吧，这就是矿工的动力了。...
Fastest way to check if a string matches a regexp in ruby?
...chmark:
require 'benchmark'
"test123" =~ /1/
=> 4
Benchmark.measure{ 1000000.times { "test123" =~ /1/ } }
=> 0.610000 0.000000 0.610000 ( 0.578133)
"test123"[/1/]
=> "1"
Benchmark.measure{ 1000000.times { "test123"[/1/] } }
=> 0.718000 0.000000 0.718000 ( 0.750010)
irb(...
How to put more than 1000 values into an Oracle IN clause [duplicate]
Is there any way to get around the Oracle 10g limitation of 1000 items in a static IN clause? I have a comma delimited list of many of IDs that I want to use in an IN clause, Sometimes this list can exceed 1000 items, at which point Oracle throws an error. The query is similar to this...
...
How does password salt help against a rainbow table attack?
...the purpose: let's say the attacker wants to build a rainbow table for 100,000 commonly used english words and typical passwords (think "secret"). Without salt she would have to precompute 100,000 hashes. Even with the traditional UNIX salt of 2 characters (each is one of 64 choices: [a–zA–Z0–...
What's the most efficient way to erase duplicates and sort a vector?
...
@Kyle: It's pretty large. I used datasets of 1,000,000 randomly drawn integers between 1 and 1000, 100, and 10 for this graph.
– Nate Kohl
Jun 26 '09 at 15:10
...
Does Django scale? [closed]
...21.4.2015) and 70 Million users in 2013
Bitbucket: 200TB of Code and 2.500.000 Users
Disqus: Serving 400 million people with Python.
curse.com: 600k daily visits.
tabblo.com: 44k daily visits, see Ned Batchelder's posts Infrastructure for modern web sites.
chesspark.com: Alexa rank about 179k.
pownc...
How can I parse a string with a comma thousand separator to a number?
...sues. 1. It cannot handle numbers with multiple commas, e.g. parseFloat("2,000,000.00".replace(',','')) returns 2000 and 2. it fails in many regions of the world where , is a decimal place, e.g. parseFloat("2.000.000,00".replace(',','')) returns 2 - see my answer below for something that works every...
How can I generate UUID in C#
...al generates sequential GUIDs like these:
19F287B4-8830-11D9-8BFC-000CF1ADC5B7
19F287B5-8830-11D9-8BFC-000CF1ADC5B7
19F287B6-8830-11D9-8BFC-000CF1ADC5B7
19F287B7-8830-11D9-8BFC-000CF1ADC5B7
19F287B8-8830-11D9-8BFC-000CF1ADC5B7
Here is a summary of ...