At compile-time, GNU Mach is parameterized with several constants. These might need some tuning. Debian has some patches.
IRC, freenode, #hurd, 2011-06-09
<braunr> youpi: in ipc/ipc_hash.c, there is code which computes the size of the global (space, port)->entry hash table <braunr> youpi: you may be interested in tuning this one too <youpi> I know <braunr> ok <youpi> the current value is not so bad <youpi> it's big enough for buildds to run fine <braunr> 256 if i'm right <braunr> well <braunr> it won't fail <youpi> we're limited by the 4000 object limitation anyway <braunr> since it's a chained hash table <braunr> but increasing it may help performances a bit <braunr> and it certainly can't hurt much