hrj

• The certificate file used by the reverse proxy should be exactly the same as the one used by synapse. If you use the concatenated certificate chain on the reverse-proxy, it should be the same in synapse.
• You need to generate and give Diffie Hellman parameters to the reverse proxy. This ensures that the cipher suites required by matrix are available in the reverse proxy.
• Matrix servers use the 8448 port to talk with each other by default.
• Either you need to expose this port (8448) in the firewall, or you need to add a SRV record in the DNS pointing to port 443 (https port).
• This tool can help diagnose problems.

hrj

public class Compute {
  public static void main(String args[]) {
    final long start = System.currentTimeMillis();
    final long ans = rep(8000);
    final long end = System.currentTimeMillis();
    System.out.println(ans);
    System.out.println("Time taken (ms): " + (end - start));
  }

  public static long rep(long n) {

hrj

list

-fbranch-probabilities
-fbranch-target-load-optimize
-fbranch-target-load-optimize2
-fbtr-bb-exclusive
-fconserve-stack
-fcx-fortran-rules
-fcx-limited-range
-fdata-sections

hrj

// Huffman estimation given symbol counts

val symbolCountsIn = Array(57728,32858,49395,15703,26381,4506,5797,1129,958,392,164,278,61,206,30,193,19,172,9,150,4,91,4,91,1,71,4,44,2,29,1,28,1,32,0,15,0,8,0,12,0,11,0,15,0,6,0,4,0,0,0,2,0,1,0,2)

case class Symbol(count:Int, idx: Int)

sealed trait TreeNode {
  def value:Int
}

hrj

Static data

nm --size-sort -S -C -r flif | grep "\<[Rr]\>" 

size               name
----------------------------
0000000000002002 R log4k
0000000000000800 R crc32k_tab

hrj

Languages designed for learning

• Racket
• Pyret

hrj

#!/usr/bin/python

import SocketServer
import BaseHTTPServer
import SimpleHTTPServer

class ThreadingSimpleServer(SocketServer.ThreadingMixIn,
                   BaseHTTPServer.HTTPServer):
    pass

hrj

TL;DR

When you are in a shell in Linux, you may be led to believe you are in directory xyz but might actually be in directory pqr.

---

Demonstration

In a terminal,

hrj

import net.iryndin.jdbf.reader.*
import net.iryndin.jdbf.core.*

val fis = java.io.FileInputStream(args[0])
val reader = DbfReader(fis)

val md = reader.getMetadata()

val fields = md.getFields()

hrj

Navigating to Wikipedia home page was causing a massive slowdown of the browser. After analysis the problem turned out to be due to a long chain of causes.

A] Whenever mouse is hovered on an element, the element and its descendants are invalidated.

This is a known and important issue, but will take time to fix. Issue #89. See Update below.

B] Invalidation causes re-layouting of the whole DOM tree

As a consequence of A, every mouse move causes the body element to be invalidated, and also its descendants. By itself, this is correct behaviour. (Not really, see update below).

C] Re-layouting of inline-blocks was causing new instances of RInlineBlock to be created.

This is bad but by itself it is not terribly inefficient. However, it causes more trouble...