From: "Eric Wong (Contractor, The Linux Foundation)" <e@80x24.org>
To: meta@public-inbox.org
Subject: [WIP PATCH 0/12] v2: git repo rotation + parallel Xapian indexing
Date: Thu, 22 Feb 2018 21:42:10 +0000 [thread overview]
Message-ID: <20180222214222.1086-1-e@80x24.org> (raw)
The key thing is sharding git and sharding of Xapian are not
tied together:
git repos are sharded to reduce clone/repack costs; so we shard
them based on size (currently 1G or so).
Xapian DBs are sharded to take advantage of SMP during the indexing
phase.
Current import times are as follows:
git-only: ~1 minute
git+SQLite: ~12 minutes
git+Xapian+SQLite serial: ~45 minutes
git+Xapian+SQLite 4 parts: ~15 minutes (2 + 2 hyperthread)
More cores will help since the Xapian text+term indexing is the
slowest and the only partitioned work.
I also tested just the December 2017 archives on an 8-core AMD
FX-8320. I forget the specifics, but I seem to recall half the
cores on that chip are not full power:
4 parts: 58s
8 parts: 45s
Note: I use eatmydata (LD_PRELOAD to disable sync/fsync) for development
and I consider it perfectly safe to use for offline updates/reindexing.
next reply other threads:[~2018-02-22 21:42 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-22 21:42 Eric Wong (Contractor, The Linux Foundation) [this message]
2018-02-22 21:42 ` [PATCH 01/12] import: allow the epoch (0s) as a valid time Eric Wong (Contractor, The Linux Foundation)
2018-02-22 21:42 ` [PATCH 02/12] extmsg: fix broken Xapian MID lookup Eric Wong (Contractor, The Linux Foundation)
2018-02-22 21:42 ` [PATCH 03/12] search: stop assuming Message-ID is unique Eric Wong (Contractor, The Linux Foundation)
2018-02-22 21:42 ` [PATCH 04/12] www: stop assuming mainrepo == git_dir Eric Wong (Contractor, The Linux Foundation)
2018-02-22 21:42 ` [PATCH 05/12] v2writable: initial cut for repo-rotation Eric Wong (Contractor, The Linux Foundation)
2018-02-22 21:42 ` [PATCH 06/12] git: reload alternates file on missing blob Eric Wong (Contractor, The Linux Foundation)
2018-02-22 21:42 ` [PATCH 07/12] v2: support Xapian + SQLite indexing Eric Wong (Contractor, The Linux Foundation)
2018-02-22 21:42 ` [PATCH 08/12] import_vger_from_inbox: allow "-V" option Eric Wong (Contractor, The Linux Foundation)
2018-02-22 21:42 ` [PATCH 09/12] import_vger_from_mbox: use PublicInbox::MIME and avoid clobbering Eric Wong (Contractor, The Linux Foundation)
2018-02-22 21:42 ` [PATCH 10/12] v2: parallelize Xapian indexing Eric Wong (Contractor, The Linux Foundation)
2018-02-22 21:42 ` [PATCH 11/12] v2writable: round-robin to partitions based on article number Eric Wong (Contractor, The Linux Foundation)
2018-02-22 21:42 ` [PATCH 12/12] searchidxpart: increase pipe size for partitions Eric Wong (Contractor, The Linux Foundation)
2018-02-23 1:22 ` [WIP PATCH 0/12] v2: git repo rotation + parallel Xapian indexing Eric Wong
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