Oodle 2.3.0 Thread-Phased Performance

Thread-Phased (two threads) decoding can be used with Mermaid just as it was with Kraken.

It's not as big a benefit on Mermaid as it is for Kraken. (Kraken gets around 1.5X, Mermaid much less).

There is a little neat thing about thread-phased Mermaid though, and that's the ability to run Mermaid+ at almost the exact same speed as Mermaid.

Mermaid+ is a hybrid option that's hidden in Oodle 2.3.0 and will be exposed in the next release. It gets compression between Mermaid & Kraken, with a small speed hit vs Mermaid.

Seven :

ooSelkie    :  2.19:1 ,    3.0 enc MB/s , 3668.0 dec MB/s
ootp2Mermaid:  2.46:1 ,    2.3 enc MB/s , 3046.1 dec MB/s
lz4hc       :  2.00:1 ,   12.8 enc MB/s , 2532.4 dec MB/s
ooMermaid   :  2.46:1 ,    2.3 enc MB/s , 2364.4 dec MB/s
ootp2Kraken :  2.91:1 ,    2.6 enc MB/s , 1660.9 dec MB/s
ooKraken    :  2.91:1 ,    2.6 enc MB/s , 1049.6 dec MB/s
zlib9       :  2.33:1 ,    7.9 enc MB/s ,  315.1 dec MB/s

ootp2Merm+  :  2.64:1 ,    2.3 enc MB/s , 3042.4 dec MB/s
ooMermaid+  :  2.64:1 ,    2.3 enc MB/s , 2044.5 dec MB/s

Silesia :

ooSelkie    :  3.05:1 ,    1.3 enc MB/s , 2878.4 dec MB/s
ootp2Mermaid:  3.57:1 ,    1.1 enc MB/s , 2600.8 dec MB/s
lz4hc       :  2.72:1 ,   13.6 enc MB/s , 2273.5 dec MB/s
ooMermaid   :  3.57:1 ,    1.1 enc MB/s , 1994.2 dec MB/s
ootp2Kraken :  4.08:1 ,    1.2 enc MB/s , 1434.4 dec MB/s
ooKraken    :  4.08:1 ,    1.2 enc MB/s , 1000.5 dec MB/s
zlib9       :  3.13:1 ,    8.3 enc MB/s ,  358.4 dec MB/s

ootp2Merm+  :  3.58:1 ,    1.1 enc MB/s , 2583.9 dec MB/s
ooMermaid+  :  3.58:1 ,    1.1 enc MB/s , 1986.8 dec MB/s

Game Test Set :

ooSelkie    :  2.03:1 ,    3.3 enc MB/s , 4548.0 dec MB/s
lz4hc       :  1.78:1 ,   14.0 enc MB/s , 3171.1 dec MB/s
ootp2Mermaid:  2.28:1 ,    2.7 enc MB/s , 3099.4 dec MB/s
ooMermaid   :  2.28:1 ,    2.7 enc MB/s , 2622.8 dec MB/s
ootp2Kraken :  2.57:1 ,    2.9 enc MB/s , 1812.7 dec MB/s
ooKraken    :  2.57:1 ,    2.9 enc MB/s , 1335.9 dec MB/s
zlib9       :  1.99:1 ,    8.3 enc MB/s ,  337.2 dec MB/s

ootp2Merm+  :  2.35:1 ,    2.7 enc MB/s , 3034.9 dec MB/s
ooMermaid+  :  2.35:1 ,    2.7 enc MB/s , 2409.0 dec MB/s

Pulling out just the relevant numbers on Seven, you can see Mermaid+ is between Mermaid and Kraken, but thread-phased it runs at full Mermaid speed :

Seven :

ooMermaid   :  2.46:1 ,    2.3 enc MB/s , 2364.4 dec MB/s
ooMermaid+  :  2.64:1 ,    2.3 enc MB/s , 2044.5 dec MB/s
ooKraken    :  2.91:1 ,    2.6 enc MB/s , 1049.6 dec MB/s

ootp2Mermaid:  2.46:1 ,    2.3 enc MB/s , 3046.1 dec MB/s
ootp2Merm+  :  2.64:1 ,    2.3 enc MB/s , 3042.4 dec MB/s
ootp2Kraken :  2.91:1 ,    2.6 enc MB/s , 1660.9 dec MB/s