From: "Fabian Grünbichler" <f.gruenbichler@proxmox.com>
To: pbs-devel@lists.proxmox.com
Subject: [pbs-devel] [RFC proxmox-backup 2/2] image backup: use 4M input buffer
Date: Wed, 17 Jul 2024 15:08:27 +0200 [thread overview]
Message-ID: <20240717130827.1073067-3-f.gruenbichler@proxmox.com> (raw)
In-Reply-To: <20240717130827.1073067-1-f.gruenbichler@proxmox.com>
with the default 8k input buffer size, the client will spend most of the time
polling instead of reading/chunking/uploading.
tested with 16G random data file from tmpfs to fresh datastore backed by tmpfs,
without encryption.
stock:
Time (mean ± σ): 36.064 s ± 0.655 s [User: 21.079 s, System: 26.415 s]
Range (min … max): 35.663 s … 36.819 s 3 runs
patched:
Time (mean ± σ): 23.591 s ± 0.807 s [User: 16.532 s, System: 18.629 s]
Range (min … max): 22.663 s … 24.125 s 3 runs
Summary
patched ran
1.53 ± 0.06 times faster than stock
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
---
obviously, this slightly increases memory usage..
the effect here is less pronounced than for the example because the actual
reading and chunking part is not all the client has to do for a backup - digest
calculation and TLS crypto make up the bulk of the rest..
proxmox-backup-client/src/main.rs | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/proxmox-backup-client/src/main.rs b/proxmox-backup-client/src/main.rs
index 6a7d09047..5edb2a824 100644
--- a/proxmox-backup-client/src/main.rs
+++ b/proxmox-backup-client/src/main.rs
@@ -286,8 +286,12 @@ async fn backup_image<P: AsRef<Path>>(
let file = tokio::fs::File::open(path).await?;
- let stream = tokio_util::codec::FramedRead::new(file, tokio_util::codec::BytesCodec::new())
- .map_err(Error::from);
+ let stream = tokio_util::codec::FramedRead::with_capacity(
+ file,
+ tokio_util::codec::BytesCodec::new(),
+ 4 * 1024 * 1024,
+ )
+ .map_err(Error::from);
let stream = FixedChunkStream::new(stream, chunk_size.unwrap_or(4 * 1024 * 1024));
--
2.39.2
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next prev parent reply other threads:[~2024-07-17 13:08 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-17 13:08 [pbs-devel] [PATCH proxmox-backup 0/2] improve fixed size chunker performance Fabian Grünbichler
2024-07-17 13:08 ` [pbs-devel] [PATCH proxmox-backup 1/2] example: improve chunking speed example Fabian Grünbichler
2024-07-17 13:08 ` Fabian Grünbichler [this message]
2024-07-19 7:28 ` [pbs-devel] [RFC proxmox-backup 2/2] image backup: use 4M input buffer Dietmar Maurer
2024-07-22 8:03 ` [pbs-devel] applied: [PATCH proxmox-backup 0/2] improve fixed size chunker performance Thomas Lamprecht
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