September 2019 - Dev - lists.ceph.io

by Mark Nelson

Hi Guys, Earlier this week I was working on investigating the impact of OMAP performance on RGW and wanted to see if putting rocksdb on ramdisk would help speed up bucket index updates. While running tests I found out that the benchmark tool I was using consumed roughly 15 cores of CPU to push 4K puts/second to RGW from 128 threads. That wasn't really viable, so I started looking for alternate S3 benchmarking tools. COSBench is sort of the most well known choice out there, but it's a bit cumbersome if you just want to run some quick tests from the command-line. I managed to find a simple yet very nice benchmark written in go developed by Wasabi Inc called s3-benchmark. While it works well, it really only targets single buckets and is designed more for AWS testing than for Ceph. I forked the project and pretty much refactored the whole thing to be more useful for the kind of testing I want to do. It's now at the point where I think it might be ready to experiment with. S3 benchmarking has been a semi-recurring topic on the list so I figured other folks might be interested in trying it too and hopefully providing feedback. The new benchmark is called hsbench and it's available here: https://github.com/markhpc/hsbench See the README.md for some of the advantages over the original s3-benchmark program it was forked from. I consider this release to be alpha level quality and disclaim all responsibility if it breaks and deletes every object in all of your buckets. Consider yourself warned. :) Mark

4 years, 7 months

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by MarilynnGardemalGWJ

4 years, 7 months

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Static Analysis

by Brad Hubbard

Latest static analyser results are up on http://people.redhat.com/bhubbard/ Weekly Fedora Copr builds are at https://copr.fedorainfracloud.org/coprs/badone/ceph-weeklies/ -- Cheers, Brad

4 years, 7 months

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4 years, 7 months

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by Joyce

4 years, 7 months

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4 years, 7 months

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4 years, 7 months

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Re: customized equipment waterproof wiring

by wadeyuy

4 years, 7 months

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How to test PG mapping with reweight

by Robert LeBlanc

I'd like to test how reweighting an OSD will change how the PGs map in the cluster. I suspect that I'd dump the CRUSH map and PGs in the cluster that I'm interested in then use osdmaptool. I'm not understanding how to use osdmaptool to set the reweight, then query a PG or the entire set of PGs that I'm interested in. I then suspect that if I'm okay with the new map that I could inject it into the cluster instead of having to run reweight on the OSD(s). This is a Jewel cluster and I'm trying to calculate OSD usage offline, then inject a map that is more distributed instead of doing a reweight, move the PGs which take a long time to just rinse and repeat over and over again. Thanks, Robert LeBlanc ---------------- Robert LeBlanc PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1

4 years, 7 months

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4 years, 7 months

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Dev September 2019