From: shibata.hiroshi@...
Date: 2014-08-12T03:59:51+00:00
Subject: [ruby-core:64328] [ruby-trunk - Feature #9997] [Closed] Specifying non volatile registers for increase performence in ppc64

Issue #9997 has been updated by Hiroshi SHIBATA.

Status changed from Open to Closed
% Done changed from 0 to 100

Applied in changeset r47149.

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* vm_exec.c: improve performance in ppc64 arch.
  [ruby-core:63437] [Feature #9997]

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Feature #9997: Specifying non volatile registers for increase performence in ppc64
https://bugs.ruby-lang.org/issues/9997#change-48307

* Author: Leonardo Bianconi
* Status: Closed
* Priority: Normal
* Assignee: Leonardo Bianconi
* Category: core
* Target version: current: 2.2.0
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To increase performance on ppc64 machines, the registers 14 and 15 were specified for the architecture, just like for x86_64 machines.

I've executed some benchmarks, see below:

bm_loop_for.rb
Before              After
real	0m2.524s    real	0m2.781s
user	0m2.520s    user	0m2.777s
sys	0m0.004s    sys         0m0.004s

bm_loop_whileloop.rb
Before              After
real    0m1.142s    real        0m1.267s
user    0m1.138s    user        0m1.263s
sys     0m0.004s    sys         0m0.004s

bm_so_array.rb
Before              After
real    0m1.556s    real        0m1.832s
user    0m1.552s    user        0m1.828s
sys     0m0.004s    sys         0m0.004s

bm_so_matrix.rb
Before              After
real    0m1.070s    real        0m1.107s
user    0m1.066s    user        0m1.104s
sys     0m0.004s    sys         0m0.004s

---Files--------------------------------
enhac_ppc64.patch (781 Bytes)
Ruby_ppc64_benchmark.pdf (53.6 KB)


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