On 9/23/24 14:00, Friedrich Weber wrote:
On 23/09/2024 11:17, Dominik Csapak wrote:
[...]
so i did some benchmarks (mostly disk writes) and wrote the short script
below
(maybe we can reuse that?)
----8<----
use strict;
use warnings;
use PVE::Tools;
my $size = shift;
sub get_bytes_written {
my $fh = IO::File->new("/proc/diskstats", "r");
die if !$fh;
my $bytes = undef;
while (defined(my $line = <$fh>)) {
if ($line =~ m/sdb/) {
my @fields = split(/\s+/, $line);
$bytes = $fields[10] * 512;
}
}
return $bytes;
}
sub test_write {
my ($k) = @_;
system("rm /etc/pve/testfile");
my $data = "a"x($k*1024);
system("sync; echo -n 3> /proc/sys/vm/drop_caches");
I'm not sure this actually drops the caches: Without the space between
`3` and `>` I think this redirects fd 3 to that file (so doesn't
actually write the `3`)? I didn't run the script though, so not sure if
it makes any difference for the results.
ah yeah, i noticed, but forgot to answer here. i fixed it here locally and
rerun the tests but had the same results (+- a bit of variation)
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