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6.6 Increasing maximum memory on Windows and Cygwin
Windows and Cygwin (see section 3.1.4 for Cygwin installation specifics) users may find that they run
out of memory when running some of the programs shipped with TEX Live. For example, asy might
run out of memory if you try to allocate an array of 25,000,000 reals, and LuaTEX might run out of
memory if you try to process a document with a lot of big fonts.
For Cygwin, you can increase the amount of available memory by following the instructions in the
Cygwin User's Guide (http://www.cygwin.com/cygwin-ug-net/setup-maxmem.html).
For Windows, you have to create a file, say moremem.reg, with these four lines:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\Software\Cygwin]
"heap_chunk_in_mb"=dword:ffffff00
and then execute the command regedit /s moremem.reg as administrator. (If you want to change
memory only for the current user instead of system-wide, use HKEY_CURRENT_USER.)