[pbs-devel] [PATCH 0/3] Add cache for live-restore
Stefan Reiter
s.reiter at proxmox.com
Wed Apr 28 18:06:52 CEST 2021
Adds a mmap-backed buffer (as suggested by Dietmar to avoid memory starvation)
of 64+256 MiB for accessing chunks from PBS. Helps to accelerate live-restore.
Quantitative benchmarking appears really hard, variance between live-restore
runs is really high for some reason (both time-to-desktop and time-to-finish).
On average it seems to be between equal and up to 30% faster - again, with a lot
of variance between runs.
In testing with a Windows VM I saw cache hit rates of about 25% or higher, so
the cache is certainly used, but there seem to be too many other factors in
play...
proxmox-backup: Stefan Reiter (2):
tools: add mmap_buffer module
RemoteChunkReader: add LRU cached variant
src/bin/proxmox_backup_client/mount.rs | 12 ++-
src/client/remote_chunk_reader.rs | 110 ++++++++++++++++++++----
src/tools.rs | 1 +
src/tools/mmap_buffer.rs | 113 +++++++++++++++++++++++++
4 files changed, 218 insertions(+), 18 deletions(-)
create mode 100644 src/tools/mmap_buffer.rs
proxmox-backup-qemu: Stefan Reiter (1):
access: use bigger cache and LRU chunk reader
src/restore.rs | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
--
2.20.1
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