### 🔀 [#150](https://github.com/ikawrakow/ik_llama.cpp/pull/150) - IQ4_KS_R4

| **Author** | `ikawrakow` |
| :--- | :--- |
| **State** | ❌ **Closed** |
| **Created** | 2024-12-18 |
| **Updated** | 2024-12-18 |

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#### Description

Adding `IQ4_KS` with 4 interleaved rows.

We get very signifiant performance gains on `ARM_NEON` and good gains on `AVX2/Zen4`. 

Here is `PP-512` for LLaMA-3.1-8B on `Zen4` (Ryzen-7950X), `ARM_NEON` (M2-Max) and `AVX2` (Ryzen-5975WX)

| Platform |  Threads | IQ4_KS | IQ4_KS_R4 | Speedup |
| ---: | ---: | ---: | ---: | ---: |
| ARM_NEON |  8 |  67.29 ± 1.02  | 124.91 ± 0.62 | 1.856 |
| Zen4            | 16 | 180.42 ± 0.68 | 266.05 ± 0.45  | 1.475 |
| AVX2           | 32 | 201.79 ± 0.48 |  245.37 ± 0.52  | 1.216 |

We get decent performance gains for TG as well.
Here results for TG-128 on LLaMA-3.1-8B with different numbers of threads:

| Platform |  Threads | IQ4_KS | IQ4_KS_R4 | Speedup |
| ---: | ---: | ---: | ---: | ---: |
| ARM_NEON | 2 |  10.84 ± 0.01 | 12.55 ± 0.00 | 1.158 |
|                      | 4 | 19.81 ± 0.12 | 22.06 ± 0.06 | 1.114 |
|                      | 8 | 25.74 ± 0.47 | 26.47 ± 0.21  | 1.039 |
| Zen4            | 1 |  6.18 ± 0.00  | 7.97 ± 0.11  |  1.290 |
|                      | 2 |  11.73 ± 0.02 | 13.43 ± 0.00  |  1.145 |
|                      | 4 |  13.09 ± 1.13  | 14.46 ± 0.00  |  1.105 |
| AVX2           | 2 | 4.74 ± 0.00  | 7.30 ± 0.00 | 1.540 |
|                     | 4 | 8.75 ± 0.00  |  11.39 ± 0.00 | 1.302 |
|                     | 8 |  12.38 ± 0.01  | 12.73 ± 0.00  | 1.028 |