zzet--gortex/internal/indexer/gc_tune_linux.go

//go:build linux

package indexer

import "golang.org/x/sys/unix"

// hostPhysicalMemory returns total physical RAM in bytes via sysinfo(2).
// Totalram is reported in units of Unit bytes; both fields are widened to
// uint64 so the multiply is correct on 32-bit arches too. Returns 0 when the
// syscall fails, so the budget logic falls back cleanly.
func hostPhysicalMemory() uint64 {
	var si unix.Sysinfo_t
	if err := unix.Sysinfo(&si); err != nil {
		return 0
	}
	unit := uint64(si.Unit)
	if unit == 0 {
		unit = 1
	}
	return uint64(si.Totalram) * unit
}