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From "Aleksey Shipilev" <aleksey.shipi...@gmail.com>
Subject [general][performance] Serialization performance optimization results
Date Fri, 30 May 2008 11:39:24 GMT
Hi,

Here is the scrub of the serialization performance improvements we
have today. I had used SPECjvm2008:serial as reference benchmark,
running it on 8-core Xeon (E5440/2.86Ghz/HTN) / 24 Gb DDR2-667 /
Windows 2003 EE SP1. All measurements were done in 5 iterations, 240
secs per one iteration, max result was used as score. Scores are
ops/min, the more the better. All JVMs were run in "-server -Xmx512M
-Xms512M" mode. Measurement deviations are within 3%.

Baseline measurements:
  Sun 1.6.0_05 -server     145.0
  Harmony r641838 -server 29.4

So, Harmony performance was only 20% of RI on serialization workload.

The improvements:
(JIRA#, Harmony score, boost relative to baseline, status relative to RI.)

-- already in trunk -----
HARMONY-5635,  33.1,  13%,  23%
HARMONY-5634,  35.4,  20%,  24%
HARMONY-5640,  36.2,  23%,  25%
HARMONY-5633,  68.7,  134%,  47%
HARMONY-5735,  69.7,  137%,  48%
HARMONY-5722,  80.4,  174%,  55%
HARMONY-5756,  83.2,  183%,  57%
HARMONY-5770,  85.1,  190%,  59%

-- ready for review and commit ------
HARMONY-5761,  88.4,  201%,  61%
HARMONY-5829,  95.7,  226%,  66%
HARMONY-5847,  110.7,  277%,  76%
HARMONY-5771,  136.5,  365%,  94%

-- need debug and review (estimated boosts) -----
HARMONY-5713,  150.2,  411%,  >>>104%<<<

The dry results of these measurements are:
 1. After the committing rest of the _ready_ issues we will be close
to Sun's performance. Nathan is working on HARMONY-5829 and
HARMONY-5847 now, but HARMONY-5761 (WeakHashMap improvements) and
HARMONY-5771 (IdentityHashMap improvements) are still orphaned. Can
someone take them?

 2. After the completion of HARMONY-5713 we will beat the RI on
serialization benchmark.

Thanks,
Aleksey.

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