https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81421
--- Comment #13 from martin <mfe at live dot de> --- Thanks for the fast reply. It prints: nas-02-90-38:/media/gcc-7.1.0/libgo# sed '/^package /q' < /media/gcc-7.1.0/libgo/go/runtime/mksizeclasses.go // Copyright 2016 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // +build ignore // Generate tables for small malloc size classes. // // See malloc.go for overview. // // The size classes are chosen so that rounding an allocation // request up to the next size class wastes at most 12.5% (1.125x). // // Each size class has its own page count that gets allocated // and chopped up when new objects of the size class are needed. // That page count is chosen so that chopping up the run of // pages into objects of the given size wastes at most 12.5% (1.125x) // of the memory. It is not necessary that the cutoff here be // the same as above. // // The two sources of waste multiply, so the worst possible case // for the above constraints would be that allocations of some // size might have a 26.6% (1.266x) overhead. // In practice, only one of the wastes comes into play for a // given size (sizes < 512 waste mainly on the round-up, // sizes > 512 waste mainly on the page chopping). // // TODO(rsc): Compute max waste for any given size. package main nas-02-90-38:/media/gcc-7.1.0/libgo#
