I'm thinking about upgrading to Go 1.4 but am concerned because I no longer know how to change the max amount of memory I can address. I have been using Go to run some machine learning experiments on a large server, 512GB of main memory, which makes the 128GB limit set using a 37 bit address insufficient.
Previously I would edit malloc.h in the runtime package to change to 38 bit addresses but with the conversion from C to Go of the source I'm having difficulty finding if there is still something as simple to modify.
This commit that changed max memory to 128GB from 16GB shows the kind of change I am talking about https://code.google.com/p/go/source/detail?r=a310cb32c278
So I realized I did not find the file because I am not use to using the Google Code repo explorer. I located what are now 3 malloc.go files and have found the relevant section of code. https://code.google.com/p/go/source/browse/src/runtime/malloc2.go#122
Honestly I think the update using 1 and 0 booleans and multiplication rather than simple if statements is overly confusing and doesn't convey what is going on as clearly as the header file used to.
Also thank you bamboon I only realized my mistake after reading the mailing list and getting linked to a different repo viewer.