ReneNyffenegger

msys2 vs msys vs msysgit

MinGW doesn't provide a linux-like environment, that is MSYS(2) and/or Cygwin

Cygwin is an attempt to create a complete UNIX/POSIX environment on Windows. 
MinGW is a C/C++ compiler suite which allows you to create Windows executables - you only 
need the normal MSVC runtimes, which are part of any normal Microsoft Windows installation.

MinGW provides headers and libraries so that GCC (a compiler suite, 
not just a "unix/linux compiler") can be built and used against the Windows C runtime.

jboner

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