Hi all,
I have Robinhood v3.2 running on a Lustre 2.15, and might have misconfigured /
misunderstood the thread count.
The Robinhood box has 96 cores, so I have set the number of threads to 96
(EntryProcessor {nb_threads = 96;})
When checking the robinhood.log, most cores do nothing:
2026/02/02 21:46:58 [4479/1] STATS | ==== EntryProcessor Pipeline Stats ===
2026/02/02 21:46:58 [4479/1] STATS | Idle threads: 95
2026/02/02 21:46:58 [4479/1] STATS | Id constraints count: 100 (hash
min=0/max=3/avg=0.0)
2026/02/02 21:46:58 [4479/1] STATS | Name constraints count: 98 (hash
min=0/max=2/avg=0.0)
2026/02/02 21:46:58 [4479/1] STATS | Stage | Wait | Curr | Done |
Total | ms/op |
2026/02/02 21:46:58 [4479/1] STATS | 0: GET_FID | 0 | 0 | 0 |
0 | 0.00 |
2026/02/02 21:46:58 [4479/1] STATS | 1: GET_INFO_DB | 57 | 0 | 41 |
38819 | 0.35 |
2026/02/02 21:46:58 [4479/1] STATS | 2: GET_INFO_FS | 0 | 0 | 0 |
26390 | 10.08 |
2026/02/02 21:46:58 [4479/1] STATS | 3: PRE_APPLY | 0 | 0 | 0 |
37960 | 0.00 |
2026/02/02 21:46:58 [4479/1] STATS | 4: DB_APPLY | 1 | 1 | 0 |
37958 | 1.17 | 2.64% batched (avg batch size: 3.8)
2026/02/02 21:46:58 [4479/1] STATS | 5: CHGLOG_CLR | 0 | 0 | 0 |
38823 | 0.01 |
2026/02/02 21:46:58 [4479/1] STATS | 6: RM_OLD_ENTRIES | 0 | 0 | 0 |
0 | 0.00 |
This is quite single-threaded ;-(
Right now, the file system is not in production and quite idle, so Robinhood is
working to close a gap of ~100M changelog entries.
But I am afraid that with this configuration, once in production, the
changelogs will run away and fill up the MDS disk.
Regards,
Thomas
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Thomas Roth
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