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From: Alexander Zeidler <a.zeidler@proxmox.com>
To: Markus Frank <m.frank@proxmox.com>, pmg-devel@lists.proxmox.com
Date: Mon, 19 Feb 2024 19:04:43 +0100
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Subject: Re: [pmg-devel] [PATCH pmg-api v3] config: adjust max_filters
calculation to reflect current memory usage
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On Thu, 2024-01-18 at 15:55 +0100, Markus Frank wrote:
> my $max_servers =3D 5;
> my $servermem =3D 120;
> + my $base;
> my $memory =3D physical_memory();
> - my $add_servers =3D int(($memory - 512)/$servermem);
> + if ($memory < 3840) {
> + warn "low amount of system memory installed, recommended is 4+ GB\n"
> + ."to prevent OOM kills, it is better to set max_filters manually\n"=
;
> + $base =3D $memory > 1536 ? 1024 : 512;
> + } else {
> + $base =3D 2816;
> + $servermem =3D 150;
> + }
> + my $add_servers =3D int(($memory - $base)/$servermem);
> $max_servers +=3D $add_servers if $add_servers > 0;
> $max_servers =3D 40 if $max_servers > 40;
1. Perhaps we also want to increase the current max_filters limit of 40
minus 2?
2. With the recommended 4GB setup, the patch now only returns
max_filters =3D 10 instead of the previous 32 as marked in the table
below.
(table with temporarily removed 38-limit for the patch columns)
[1] [2] [3] [4] [5]
RAM *0.975=3D yet *120 left patch left
0.5 499 3 139 3 *120 139
1 998 7 158 7 *120 158
2 1996 15 196 11 *120 676
3 2995 23 235 19 *120 715
4 3993 32 153 =3D=3D> 10 *150 2493
8 7987 38 3427 37 *150 2437
16 15974 38 11414 90 *150 2474
32 31948 38 27388 197 *150 2398
64 63897 38 59337 410 *150 2397
[1] installed
[2] ca. MemTotal according to /proc/meminfo, hence used for calculation
[3] max_filters returned by current code
[4] expected servermem used in code and table for calculation
[5] (RAM * 0.975) - (max_filters * servermem)