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sycl : Improve SYCL doc (#23025)

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* Tidy up SYCL doc a bit

- Add explicit links to referenced items
- Fix spelling errors

Signed-off-by: Todd Malsbary <todd.malsbary@intel.com>

* Correct documented default for GGML_SYCL_GRAPH

The default is ON, not OFF:

  $ cmake -LAH -B build | grep GGML_SYCL_GRAPH
  ...
  GGML_SYCL_GRAPH:BOOL=ON

Signed-off-by: Todd Malsbary <todd.malsbary@intel.com>

* Move docker instructions from SYCL.md to docker.md

This makes them directly accesible from the Quick Start section
of the top-level README.md.

Signed-off-by: Todd Malsbary <todd.malsbary@intel.com>

* Refer to intel.Dockerfile for ARGs and their defaults

The defaults are always changing; this avoids accuracy errors
from duplicating the information.

Signed-off-by: Todd Malsbary <todd.malsbary@intel.com>

* Remove mention of Nvidia in SYCL row of backend table

This support was removed in 2026.02 - refer to the SYCL.md News.

Signed-off-by: Todd Malsbary <todd.malsbary@intel.com>

---------

Signed-off-by: Todd Malsbary <todd.malsbary@intel.com>
This commit is contained in:
Todd Malsbary
2026-06-03 22:02:54 -07:00
committed by GitHub
parent 94a220cd67
commit f478f1b6d7
2 changed files with 48 additions and 40 deletions
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docs/backend/SYCL.md
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@@ -44,11 +44,11 @@ The following releases are verified and recommended:
### Ubuntu 24.04
The release packages for Ubuntu 24.04 x64 (FP32/FP16) only include the binary files of the llama.cpp SYCL backend. They require the target machine to have pre-installed Intel GPU drivers and oneAPI packages that are the same version as the build package. To get the version and installation info, refer to release.yml: ubuntu-24-sycl -> Download & Install oneAPI.
The release packages for Ubuntu 24.04 x64 (FP32/FP16) only include the binary files of the llama.cpp SYCL backend. They require the target machine to have pre-installed Intel GPU drivers and oneAPI packages that are the same version as the build package. To get the version and installation info, refer to [.github/workflows/release.yml#L713](../../.github/workflows/release.yml#L713): ubuntu-24-sycl -> Download & Install oneAPI.
It is recommended to use them with Intel Docker.
It is recommended to use them with [Intel Docker](https://hub.docker.com/r/intel/deep-learning-essentials).
The packages for FP32 and FP16 would have different accuracy and performance on LLMs. Please choose it acording to the test result.
The packages for FP32 and FP16 would have different accuracy and performance on LLMs. Please choose it according to the test result.
## News
@@ -159,35 +159,7 @@ You could update your test result in it directly.
## Docker
The docker build option is currently limited to *Intel GPU* targets.
### Build image
```sh
# Using FP32
docker build -t llama-cpp-sycl --build-arg="GGML_SYCL_F16=OFF" --target light -f .devops/intel.Dockerfile .
# Using FP16
docker build -t llama-cpp-sycl --build-arg="GGML_SYCL_F16=ON" --target light -f .devops/intel.Dockerfile .
```
*Notes*:
You can also use the `.devops/llama-server-intel.Dockerfile`, which builds the *"server"* alternative.
Check the [documentation for Docker](../docker.md) to see the available images.
### Run container
```sh
# First, find all the DRI cards
ls -la /dev/dri
# Then, pick the card that you want to use (here for e.g. /dev/dri/card1).
docker run -it --rm -v "/path/to/models:/models" --device /dev/dri/renderD128:/dev/dri/renderD128 --device /dev/dri/card0:/dev/dri/card0 llama-cpp-sycl -m /models/7B/ggml-model-q4_0.gguf -p "Building a website can be done in 10 simple steps:" -n 400 -e -ngl 33 -c 4096 -s 0
```
*Notes:*
- Docker has been tested successfully on native Linux. WSL support has not been verified yet.
- You may need to install Intel GPU driver on the **host** machine *(Please refer to the [Linux configuration](#linux) for details)*.
Please refer to [Docker with SYCL](../docker.md#docker-with-sycl) for details.
## Linux
@@ -197,7 +169,7 @@ docker run -it --rm -v "/path/to/models:/models" --device /dev/dri/renderD128:/d
- **Intel GPU**
Intel data center GPUs drivers installation guide and download page can be found here: [Get intel dGPU Drivers](https://dgpu-docs.intel.com/driver/installation.html#ubuntu-install-steps).
Intel data center GPUs drivers installation guide and download page can be found here: [Get Intel dGPU Drivers](https://dgpu-docs.intel.com/driver/installation.html#ubuntu-install-steps).
*Note*: for client GPUs *(iGPU & Arc A-Series)*, please refer to the [client iGPU driver installation](https://dgpu-docs.intel.com/driver/client/overview.html).
@@ -247,7 +219,7 @@ Please follow the instructions for downloading and installing the Toolkit for Li
Following guidelines/code snippets assume the default installation values. Otherwise, please make sure the necessary changes are reflected where applicable.
Upon a successful installation, SYCL is enabled for the available intel devices, along with relevant libraries such as oneAPI oneDNN for Intel GPUs.
Upon a successful installation, SYCL is enabled for the available Intel devices, along with relevant libraries such as oneAPI oneDNN for Intel GPUs.
|Verified release|
|-|
@@ -326,7 +298,7 @@ Similar to the native `sycl-ls`, available SYCL devices can be queried as follow
./build/bin/llama-ls-sycl-device
```
This command will only display the selected backend that is supported by SYCL. The default backend is level_zero. For example, in a system with 2 *intel GPU* it would look like the following:
This command will only display the selected backend that is supported by SYCL. The default backend is level_zero. For example, in a system with 2 *Intel GPU* it would look like the following:
```
found 2 SYCL devices:
@@ -472,7 +444,7 @@ In the oneAPI command line, run the following to print the available SYCL device
sycl-ls.exe
```
There should be one or more *level-zero* GPU devices displayed as **[ext_oneapi_level_zero:gpu]**. Below is example of such output detecting an *intel Iris Xe* GPU as a Level-zero SYCL device:
There should be one or more *level-zero* GPU devices displayed as **[ext_oneapi_level_zero:gpu]**. Below is example of such output detecting an *Intel Iris Xe* GPU as a Level-zero SYCL device:
Output (example):
```
@@ -724,7 +696,7 @@ use 1 SYCL GPUs: [0] with Max compute units:512
| GGML_SYCL_TARGET | INTEL *(default)* | Set the SYCL target device type. |
| GGML_SYCL_DEVICE_ARCH | Optional | Set the SYCL device architecture. Setting the device architecture can improve the performance. See the table [--offload-arch](https://github.com/intel/llvm/blob/sycl/sycl/doc/design/OffloadDesign.md#--offload-arch) for a list of valid architectures. |
| GGML_SYCL_F16 | OFF *(default)* \|ON *(optional)* | Enable FP16 build with SYCL code path. (1.) |
| GGML_SYCL_GRAPH | OFF *(default)* \|ON *(Optional)* | Enable build with [SYCL Graph extension](https://github.com/intel/llvm/blob/sycl/sycl/doc/extensions/experimental/sycl_ext_oneapi_graph.asciidoc). |
| GGML_SYCL_GRAPH | ON *(default)* \|OFF *(Optional)* | Enable build with [SYCL Graph extension](https://github.com/intel/llvm/blob/sycl/sycl/doc/extensions/experimental/sycl_ext_oneapi_graph.asciidoc). |
| GGML_SYCL_DNN | ON *(default)* \|OFF *(Optional)* | Enable build with oneDNN. |
| GGML_SYCL_HOST_MEM_FALLBACK | ON *(default)* \|OFF *(Optional)* | Allow host memory fallback when device memory is full during quantized weight reorder. Enables inference to continue at reduced speed (reading over PCIe) instead of failing. Requires Linux kernel 6.8+. |
| GGML_SYCL_SUPPORT_LEVEL_ZERO | ON *(default)* \|OFF *(Optional)* | Enable Level Zero API for device memory allocation. Requires Level Zero headers/library at build time and Intel GPU driver (Level Zero runtime) at run time. Reduces system RAM usage during multi-GPU inference. |
@@ -739,7 +711,7 @@ use 1 SYCL GPUs: [0] with Max compute units:512
|-------------------|------------------|---------------------------------------------------------------------------------------------------------------------------|
| GGML_SYCL_DEBUG | 0 (default) or 1 | Enable log function by macro: GGML_SYCL_DEBUG |
| GGML_SYCL_ENABLE_FLASH_ATTN | 1 (default) or 0| Enable Flash-Attention. It can reduce memory usage. The performance impact depends on the LLM.|
| GGML_SYCL_DISABLE_OPT | 0 (default) or 1 | Disable optimize features for Intel GPUs. (Recommended to 1 for intel devices older than Gen 10) |
| GGML_SYCL_DISABLE_OPT | 0 (default) or 1 | Disable optimize features for Intel GPUs. (Recommended to 1 for Intel devices older than Gen 10) |
| GGML_SYCL_DISABLE_GRAPH | 0 or 1 (default) | Disable running computations through SYCL Graphs feature. Disabled by default because SYCL Graph is still on development, no better performance. |
| GGML_SYCL_ENABLE_LEVEL_ZERO | 1 (default) or 0 | Use Level Zero API for device memory allocation instead of SYCL. Reduces system RAM usage on Intel dGPUs by avoiding DMA-buf/TTM host memory staging. Requires GGML_SYCL_SUPPORT_LEVEL_ZERO=ON at build time. |
| GGML_SYCL_DISABLE_DNN | 0 (default) or 1 | Disable running computations through oneDNN and always use oneMKL. |
@@ -784,8 +756,8 @@ Pass these via `CXXFLAGS` or add a one-off `#define` to enable a flag on the spo
- `Split-mode:[row]` is not supported.
- Missed the AOT (Ahead-of-Time) in buiding.
- Good: build quickly, smaller size of binary file.
- Missed the AOT (Ahead-of-Time) in building.
- Good: Builds quickly, smaller size of binary file.
- Bad: The startup is slow (JIT) in first time, but subsequent performance is unaffected.
## Q&A