Planet Ceph

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May 12, 2015

Ceph Jerasure and ISA plugins benchmarks

In Ceph, a pool can be configured to use erasure coding instead of replication to save space. When used with Intel processors, the default Jerasure plugin that computes erasure code can be replaced by the ISA plugin for better write performances. Here is how they compare on a Intel(R) Xeon(R) CPU E3-1245 V2 @ 3.40GHz.

Encoding and decoding all used 4KB objects which is the default stripe width. Two variants of the jerasure plugins were used: Generic (jerasure_generic) and SIMD (erasure_sse4) which is used when running on an Intel processor with SIMD instructions.
This benchmark was run after compiling from sources using

$ ( cd src ; make ceph_erasure_code_benchmark )
$ TOTAL_SIZE=$((4 * 1024 * 1024 * 1024)) \
CEPH_ERASURE_CODE_BENCHMARK=src/ceph_erasure_code_benchmark \
PLUGIN_DIRECTORY=src/.libs \
  qa/workunits/erasure-code/bench.sh fplot | \
  tee qa/workunits/erasure-code/bench.js

and displayed with

firefox qa/workunits/erasure-code/bench.html

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