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swapout: Dynamically size the chunk to reserve.

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This commit is contained in:
Ole Tange 2018-02-24 16:49:00 +01:00
parent e7dd4cf74a
commit 11d2fd96a1
1 changed files with 23 additions and 10 deletions
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25
swapout/swapout
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@ -2,20 +2,33 @@
$timeout = shift || 10;
$total=10000000;
my $giga=2**30;
my $forks=1;
my $free;
my $memtotal = int(
qx{ awk '/^(MemTotal):/ { sum += \$2} END { print sum }' /proc/meminfo }
/ 1024);
$total = 1;
$onemb = "x"x1048576;
do{
$start = time;
$total=int(1+$total*1.03);
$free = int (
qx{ awk '/^((Swap)?Cached|MemFree|Buffers):/ { sum += \$2} END { print sum }' /proc/meminfo }
/ 1024);
print "Free $free ";
$total += int($free/100);
$missing = $total - $sofar;
$buf{$forks}{$total}="x"x$missing;
for(1..$missing) {
$buf{$forks}{$total}{$_} = $onemb;
}
$sofar = $total;
$timediff = time - $start;
print "Chunk size: $missing Time for swapping: $timediff seconds. Total memory used: $total\n";
if($total > $forks * $giga) {
if($total * 1048576 > $forks * $giga) {
if($pid=fork()) {
print "child spawn ",$forks,"\n";
wait;
@ -25,5 +38,5 @@ do{
$forks++;
}
}
} until ($pid or $timediff>$timeout);
} until ($pid or $timediff>$timeout or $total > $memtotal);
print "exit ",$forks,"\n";