🚀 go-pugleaf

In article <FOISON.92Jun4083821@sun.ips.tytlabs.co.jp> foison@ips.tytlabs.co.jp (Mitsuhiro Araki) writes:
 |$B6qBNE*$K$O(B /etc/rc $B$N(B mach_swapon $B$ND>A0$K0J2<$N(B - $B$G$O$5$^$l$F$$$k(B1$B9T(B
 |$B$r2C$($l$PNI$$$H;W$$$^$9(B$B!%(B
 |
 |----------------------------------------------------------------------
 |cp /dev/null /private/vm/swapfile
 |----------------------------------------------------------------------
 |
 |$B$A$J$_$K!$(B/etc/swaptab $B$NCf$K(B swapfile $B$N:GBgCM$r;XDj$9$k$3$H$,$G$-$k(B
 |$B$O$:$G$9$N$G!$(Bswapfile $B$N$?$a$K!$%G%#%9(B$B%/$,$"$U$l$k$3$H$O!$$"$kDxEY2s(B
 |$BHr$G$-$k$H;W$$$^$9!%(B


$B%V!<%H$7$?>l9g!"(Blowat$B$G;XDj$7$?%5%$%:$K(Bswapfile$B$O@_Dj$5$l$k!J$O$:!K$J(B
$B$N$G!"$3$N=hM}$O$"$s$^$jI,MW$J$$$N$G$O!)$H;W$&;d$G$9!#(B

Swapfile$B$NBg$-$5$K4X(B$B$7$F$O(BNeXT Answer / Sysadmin.569$B$K$3$s$JIw$K=q$$$F(B
$B$$$^$9!#!J0JA0!"4_K\$5$s$+$i65$($F$b$i$C$?$G$"$C$?(B$B!#!K(B

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Q: Will the swapfile get smaller (if above the low water mark)
while the system is running, or is it reset only upon reboot?

The swapfile works in a stack-oriented manner   it will shrink
only if the system detects that all pages above a certain address
are unallocated.  This rarely occurs.  Consider launching a 4MB
application which is completely paged out followed by one more
page owned by some other application in the system.  Even if the
4MB is freed the swapfile cannot be truncated until that extra
page is freed.  What generally happens is that long running
applications allocate a few pages at the high addresses, and
swapfile apparently never shrinks. 

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