From: Dietmar Maurer <dietmar@proxmox.com>
To: Proxmox VE development discussion <pve-devel@lists.proxmox.com>,
Filip Schauer <f.schauer@proxmox.com>
Subject: Re: [pve-devel] [PATCH common] tools: file_set_contents: use syswrite instead of print
Date: Wed, 25 Sep 2024 10:39:54 +0200 (CEST) [thread overview]
Message-ID: <623295300.4070.1727253594226@webmail.proxmox.com> (raw)
In-Reply-To: <20240924143321.93696-1-f.schauer@proxmox.com>
Please can you add the column showing write amplification using dd instead of file_set_contents, so that we can also see the minimal write amplf. from sqlite.
> The table below illustrates the drastic reduction in write
> amplification when writing files of different sizes to `/etc/pve/` using
> `file_set_contents`:
>
> print big_writes+print big_writes+syswrite
> data size written amplif. written amplif. written amplif.
> 1 KiB 48 KiB 48.0 45 KiB 45.0 41 KiB 41.0
> 2 KiB 48 KiB 24.0 45 KiB 22.5 62 KiB 31.0
> 4 KiB 82 KiB 20.5 80 KiB 20.0 73 KiB 18.3
> 8 KiB 121 KiB 15.1 90 KiB 11.3 89 KiB 11.1
> 16 KiB 217 KiB 13.6 146 KiB 9.1 113 KiB 7.1
> 32 KiB 506 KiB 15.8 314 KiB 9.8 158 KiB 4.9
> 64 KiB 1472 KiB 23.0 826 KiB 12.9 259 KiB 4.0
> 128 KiB 5585 KiB 43.6 3765 KiB 29.4 452 KiB 3.5
> 256 KiB 20424 KiB 79.8 10743 KiB 42.0 2351 KiB 9.2
> 512 KiB 86715 KiB 169.4 43650 KiB 85.3 3204 KiB 6.3
> 1024 KiB 369568 KiB 360.9 187496 KiB 183.1 15845 KiB 15.5
>
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next prev parent reply other threads:[~2024-09-25 8:40 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-24 14:33 Filip Schauer
2024-09-25 8:39 ` Dietmar Maurer [this message]
2024-09-25 12:54 ` Filip Schauer
2024-09-25 14:37 ` Dominik Csapak
2024-09-30 11:38 ` Filip Schauer
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