ilusha/blender
1
0
Fork 0
mirror of https://github.com/blender/blender synced 2026-09-29 04:37:17 +03:00
Code Issues Projects Releases Packages Wiki Activity Actions

Cycles: oneAPI: Use copy engine

Browse source 
The use of Intel GPU's Copy Engine was initially disabled for improved
stability but it seems more mature now.
Enabling it fixes a performance regression seen on Linux+A750,
indirectly introduced by #152649 that led to an increased use of
zeCommandListAppendMemoryFill.
Performance remains unchanged on Windows+newer GPUs.

Pull Request: https://projects.blender.org/blender/blender/pulls/153121
This commit is contained in:
Xavier Hallade 2026-01-21 11:44:23 +01:00 • committed by Gitea
parent bf49b6d1cc
commit 8abc0f2e57
1 changed files with 10 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

15
intern/cycles/device/oneapi/device.cpp
View file

@ -28,8 +28,9 @@ bool device_oneapi_init()
/* NOTE(@nsirgien): we need to enable JIT cache from here and
* right now this cache policy is controlled by env. variables. */
/* NOTE(hallade) we also disable use of copy engine as it
* improves stability as of intel/LLVM SYCL-nightly/20220529.
/* NOTE(@xavierh-intel) we enable the use of copy engine, incl. for fill
* operations as it lowers the overhead from zeCommandListAppendMemoryFill
* when running paths_array kernels on Linux+A750.
* All these env variable can be set beforehand by end-users and
* will in that case -not- be overwritten. */
/* By default, enable only Level-Zero and if all devices are allowed, also CUDA and HIP.
@ -53,8 +54,11 @@ bool device_oneapi_init()
if (getenv("ZES_ENABLE_SYSMAN") == nullptr) {
_putenv_s("ZES_ENABLE_SYSMAN", "1");
}
if (getenv("SYCL_PI_LEVEL_ZERO_USE_COPY_ENGINE") == nullptr) {
_putenv_s("SYCL_PI_LEVEL_ZERO_USE_COPY_ENGINE", "0");
if (getenv("UR_L0_USE_COPY_ENGINE") == nullptr) {
_putenv_s("UR_L0_USE_COPY_ENGINE", "1");
}
if (getenv("UR_L0_USE_COPY_ENGINE_FOR_FILL") == nullptr) {
_putenv_s("UR_L0_USE_COPY_ENGINE_FOR_FILL", "1");
}
# elif __linux__
setenv("SYCL_CACHE_PERSISTENT", "1", false);
@ -67,7 +71,8 @@ bool device_oneapi_init()
}
/* SYSMAN is needed for free_memory queries. */
setenv("ZES_ENABLE_SYSMAN", "1", false);
setenv("SYCL_PI_LEVEL_ZERO_USE_COPY_ENGINE", "0", false);
setenv("UR_L0_USE_COPY_ENGINE", "1", false);
setenv("UR_L0_USE_COPY_ENGINE_FOR_FILL", "1", false);
# endif
return true;