Support for composite devices #1993

ndgrigorian · 2025-02-14T00:01:15Z

This PR proposes supporting the oneAPI composite devices extension in dpctl, which exposes multi-tile GPU devices as root devices for each tile, but also provides access to the composite devices from level zero prior to ZE_FLAT_DEVICE_HIERARCHY=FLAT becoming the default. i.e., with ZE_FLAT_DEVICE_HIERARCHY=COMPOSITE, the composite devices are root devices, but with ZE_FLAT_DEVICE_HIERARCHY=COMBINED, a user gains access to these composite devices through dedicated APIs.

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github-actions · 2025-02-14T00:37:26Z

Deleted rendered PR docs from intelpython.github.com/dpctl, latest should be updated shortly. 🤞

github-actions · 2025-02-14T00:44:50Z

Array API standard conformance tests for dpctl= ran successfully.
Passed: 893
Failed: 3
Skipped: 118

coveralls · 2025-02-14T00:59:07Z

coverage: 86.379% (-0.4%) from 86.752%
when pulling c23cbcb on support-composite-devices
into 63f5129 on master.

github-actions · 2025-02-21T21:37:10Z

Array API standard conformance tests for dpctl=0.19.0dev0=py310h93fe807_544 ran successfully.
Passed: 894
Failed: 2
Skipped: 118

github-actions · 2025-03-01T09:51:56Z

Array API standard conformance tests for dpctl=0.20.0dev0=py310h93fe807_25 ran successfully.
Passed: 897
Failed: 0
Skipped: 125

github-actions · 2025-03-05T17:46:39Z

Array API standard conformance tests for dpctl=0.20.0dev0=py310h93fe807_27 ran successfully.
Passed: 896
Failed: 1
Skipped: 126

github-actions · 2025-03-06T00:45:04Z

Array API standard conformance tests for dpctl=0.20.0dev0=py310h93fe807_31 ran successfully.
Passed: 895
Failed: 2
Skipped: 126

github-actions · 2025-03-06T03:13:36Z

Array API standard conformance tests for dpctl=0.20.0dev0=py310h93fe807_31 ran successfully.
Passed: 895
Failed: 2
Skipped: 126

github-actions · 2025-03-06T05:56:08Z

Array API standard conformance tests for dpctl=0.20.0dev0=py310h93fe807_34 ran successfully.
Passed: 895
Failed: 2
Skipped: 126

github-actions · 2025-03-06T06:23:52Z

Array API standard conformance tests for dpctl=0.20.0dev0=py310h93fe807_34 ran successfully.
Passed: 895
Failed: 2
Skipped: 126

github-actions · 2025-03-06T06:26:14Z

Array API standard conformance tests for dpctl=0.20.0dev0=py310h93fe807_34 ran successfully.
Passed: 896
Failed: 1
Skipped: 126

github-actions · 2025-03-28T03:45:22Z

Array API standard conformance tests for dpctl=0.20.0dev0=py310h93fe807_82 ran successfully.
Passed: 894
Failed: 2
Skipped: 154

This leverages oneAPI extension for composite devices to add the free function `ext_oneapi_get_composite_devices` to the main dpctl namespace

This method is only applicable for level_zero backend, returning an empty list for all other backend types

…aspect_component` Aligns with the rest of the SyclDevice properties Adds tests for the aspects

Rename some variables for consistency

github-actions · 2025-03-31T17:20:09Z

Array API standard conformance tests for dpctl=0.20.0dev0=py310h93fe807_85 ran successfully.
Passed: 894
Failed: 2
Skipped: 154

ndgrigorian · 2025-04-01T01:48:45Z

@antonwolfy
ping

dpctl/__init__.py

dpctl/_sycl_device.pyx

dpctl/_sycl_device_factory.pyx

dpctl/_sycl_platform.pyx

dpctl/tests/test_sycl_device.py

libsyclinterface/tests/test_sycl_device_aspects.cpp

dpctl/_sycl_device.pyx

libsyclinterface/source/dpctl_sycl_device_interface.cpp

…vices_from_composite

github-actions · 2025-04-01T17:54:15Z

Array API standard conformance tests for dpctl=0.20.0dev0=py310h93fe807_99 ran successfully.
Passed: 894
Failed: 2
Skipped: 154

antonwolfy

Thank you @ndgrigorian, LGTM!

github-actions · 2025-04-01T18:38:02Z

Array API standard conformance tests for dpctl=0.20.0dev0=py310h93fe807_100 ran successfully.
Passed: 894
Failed: 2
Skipped: 154

AlexanderKalistratov · 2025-04-02T12:39:58Z

libsyclinterface/source/dpctl_sycl_device_interface.cpp

+DPCTLDevice_GetComponentDevices(__dpctl_keep const DPCTLSyclDeviceRef DRef)
+{
+    using vecTy = std::vector<DPCTLSyclDeviceRef>;
+    vecTy *ComponentDevicesVectorPtr = nullptr;


You can use unique_ptr here to avoid calling delete by hands.

__dpctl_give DPCTLDeviceVectorRef DPCTLDevice_GetComponentDevices(__dpctl_keep const DPCTLSyclDeviceRef DRef) { using vecTy = std::vector<DPCTLSyclDeviceRef>; if (!DRef) { return nullptr; } auto D = unwrap<device>(DRef); try { auto componentDevices = D->get_info<sycl::ext::oneapi::experimental::info::device:: component_devices>(); auto ComponentDevicesVectorPtr = std::make_unique(new vecTy()); ComponentDevicesVectorPtr->reserve(componentDevices.size()); for (const auto &cd : componentDevices) { ComponentDevicesVectorPtr->emplace_back( wrap<device>(new device(cd))); } return wrap<vecTy>(ComponentDevicesVectorPtr.release()); } catch (std::exception const &e) { error_handler(e, __FILE__, __func__, __LINE__); } return nullptr; }

This is something that might be smart to go back and do throughout the libsyclinterface codebase

AlexanderKalistratov · 2025-04-02T12:47:34Z

libsyclinterface/source/dpctl_sycl_device_interface.cpp

+__dpctl_give DPCTLSyclDeviceRef
+DPCTLDevice_GetCompositeDevice(__dpctl_keep const DPCTLSyclDeviceRef DRef)
+{
+    auto D = unwrap<device>(DRef);


This function feels a bit overcomplicated. Is this done for purpose?

__dpctl_give DPCTLSyclDeviceRef DPCTLDevice_GetCompositeDevice(__dpctl_keep const DPCTLSyclDeviceRef DRef) { if (!DRef) { return nullptr; } auto D = unwrap<device>(DRef); try { bool is_component = D->has(sycl::aspect::ext_oneapi_is_component); if (is_component) { const auto &compositeDevice = D->get_info<sycl::ext::oneapi::experimental::info::device:: composite_device>(); return wrap<device>(new device(compositeDevice)); } } catch (std::exception const &e) { error_handler(e, __FILE__, __func__, __LINE__); } return nullptr; }

AlexanderKalistratov · 2025-04-02T12:55:55Z

libsyclinterface/source/dpctl_sycl_device_manager.cpp

+ */
+__dpctl_give DPCTLDeviceVectorRef DPCTLDeviceMgr_GetCompositeDevices()
+{
+    using vecTy = std::vector<DPCTLSyclDeviceRef>;


Same here. unique_ptr + combine two try...catch into one:

__dpctl_give DPCTLDeviceVectorRef DPCTLDeviceMgr_GetCompositeDevices() { using vecTy = std::vector<DPCTLSyclDeviceRef>; try { auto Devices = std::make_unique(new vecTy()); auto composite_devices = ext::oneapi::experimental::get_composite_devices(); Devices->reserve(composite_devices.size()); for (const auto &CDev : composite_devices) { Devices->emplace_back(wrap<device>(new device(std::move(CDev)))); } return wrap<vecTy>(Devices.release()); } catch (std::exception const &e) { error_handler(e, __FILE__, __func__, __LINE__); } return nullptr; }

AlexanderKalistratov · 2025-04-02T13:18:22Z

libsyclinterface/source/dpctl_sycl_platform_interface.cpp

@@ -316,3 +316,39 @@ DPCTLPlatform_GetDevices(__dpctl_keep const DPCTLSyclPlatformRef PRef,
        return nullptr;
    }
 }
+
+__dpctl_give DPCTLDeviceVectorRef
+DPCTLPlatform_GetCompositeDevices(__dpctl_keep const DPCTLSyclPlatformRef PRef)


Same here:

__dpctl_give DPCTLDeviceVectorRef DPCTLPlatform_GetCompositeDevices(__dpctl_keep const DPCTLSyclPlatformRef PRef) { if (!PRef) { error_handler("Cannot retrieve composite devices from " "DPCTLSyclPlatformRef as input is a nullptr.", __FILE__, __func__, __LINE__); return nullptr; } auto P = unwrap<platform>(PRef); using vecTy = std::vector<DPCTLSyclDeviceRef>; try { auto DevicesVectorPtr = std::unique_ptr<>(new vecTy()); auto composite_devices = P->ext_oneapi_get_composite_devices(); DevicesVectorPtr->reserve(composite_devices.size()); for (const auto &Dev : composite_devices) { DevicesVectorPtr->emplace_back( wrap<device>(new device(std::move(Dev)))); } return wrap<vecTy>(DevicesVectorPtr.release()); } catch (std::exception const &e) { error_handler(e, __FILE__, __func__, __LINE__); } return nullptr; }

AlexanderKalistratov · 2025-04-02T13:42:28Z

libsyclinterface/source/dpctl_sycl_device_interface.cpp

+{
+    using vecTy = std::vector<DPCTLSyclDeviceRef>;
+    vecTy *ComponentDevicesVectorPtr = nullptr;
+    if (DRef) {


In some functions we are checking for XRef to be non nullptr. (https://github.com/IntelPython/dpctl/pull/1993/files#diff-93f8a41da82dd5dd2ae6b05e019d8104c87c244e6077d5a819625a2fc5e3a2f1R858)

In others we are checking that result of auto X = unwrap<...>(XRef) is non nullptr. (https://github.com/IntelPython/dpctl/pull/1993/files#diff-93f8a41da82dd5dd2ae6b05e019d8104c87c244e6077d5a819625a2fc5e3a2f1R883, https://github.com/IntelPython/dpctl/pull/1993/files#diff-2cee49fe41f858d191076f530e6c6ce6ca841be844b8bca525509ed3deddbbaeR324)

Is that intentionally?
Are these checks interchangeable?
Can we unwrap<...>(XRef) if XRef is nullptr?
Can result of unwrap<...>(XRef) be nullptr if XRef is not nullptr?

They are treated as more or less interchangeable throughout the file, and throughout libsyclinterface.

As to if we can unwrap a nullptr, yes, there are a few tests which more or less do this throughout the libsyclinterface tests.

And the last question, I can't think of such a case. Given it's treated as interchangeable: probably not.

AlexanderKalistratov

A bit late, but I have some comments:

try to avoid calling delete by hands and use unique_ptr instead
In most of the functions two try...catch blocks could be combined into one.
I have question about equivalence of two checks:

if (XRef) {
    auto X = unwrap<...>(XRef);
    ...
}

vs

auto X = unwrap<...>(XRef);
if (X) {
    ...
}

ndgrigorian · 2025-04-02T17:33:53Z

A bit late, but I have some comments:

try to avoid calling delete by hands and use unique_ptr instead

In most of the functions two try...catch blocks could be combined into one.

I have question about equivalence of two checks:
if (XRef) {
    auto X = unwrap<...>(XRef);
    ...
}
vs
auto X = unwrap<...>(XRef);
if (X) {
    ...
}

Suggestions themselves make sense, I think it may be most sensible to open up (a) PR(s) doing some refactoring and clean-up in libsyclinterface

ndgrigorian force-pushed the support-composite-devices branch 2 times, most recently from 2d5942d to 76f2fc2 Compare February 21, 2025 20:55

ndgrigorian force-pushed the support-composite-devices branch from 76f2fc2 to 00cb089 Compare March 1, 2025 09:10

ndgrigorian force-pushed the support-composite-devices branch from 00cb089 to cc5ef08 Compare March 5, 2025 17:03

ndgrigorian force-pushed the support-composite-devices branch from 7ea744b to b8c765f Compare March 6, 2025 02:31

ndgrigorian force-pushed the support-composite-devices branch 2 times, most recently from 4ab4cb0 to 8327887 Compare March 6, 2025 05:44

ndgrigorian marked this pull request as ready for review March 6, 2025 05:45

ndgrigorian requested review from antonwolfy, vlad-perevezentsev and vtavana as code owners March 6, 2025 05:45

ndgrigorian force-pushed the support-composite-devices branch from 8327887 to d27f1d0 Compare March 28, 2025 03:02

ndgrigorian added 6 commits March 31, 2025 09:34

Add dpctl.get_composite_devices

f787027

This leverages oneAPI extension for composite devices to add the free function `ext_oneapi_get_composite_devices` to the main dpctl namespace

Adds get_composite_devices method to dpctl.SyclPlatform

92bcdfd

This method is only applicable for level_zero backend, returning an empty list for all other backend types

Add composite device related attributes to dpctl.SyclDevice

d431ca1

Add a test for get_composite_devices

752d927

is_composite and is_component -> has_aspect_composite and `has_…

20ab076

…aspect_component` Aligns with the rest of the SyclDevice properties Adds tests for the aspects

Adds is_component and is_composite as dpctl aspect strings

a8aff3d

ndgrigorian added 4 commits March 31, 2025 09:34

Adds C-API tests for composite devices

c2274aa

More C-API tests for composite devices

cc1e023

Rename some variables for consistency

Add a test for component and composite device methods

be613bb

Add tests for dpctl.SyclPlatform.get_composite_devices

9cb7b50

ndgrigorian force-pushed the support-composite-devices branch from d27f1d0 to 9cb7b50 Compare March 31, 2025 16:34

ndgrigorian requested a review from AlexanderKalistratov April 1, 2025 02:00

antonwolfy reviewed Apr 1, 2025

View reviewed changes

ndgrigorian added 7 commits April 1, 2025 08:40

Add dpctl.get_composite_devices to docs

1013422

Remove debug print in SyclDevice aspect tests

ea4101f

Fix mistake in dpctl.SyclPlatform.get_composite_devices docstring

cf6fce2

Fix dpctl.SyclDevice.composite_device docstring

d51657a

Check component and composite device aspects in test_get_component_de…

1821b76

…vices_from_composite

Use reserve in DPCTLDevice_GetComponentDevices

340ffa2

SyclSubdeviceCreationError -> SyclSubDeviceCreationError

c23cbcb

antonwolfy approved these changes Apr 1, 2025

View reviewed changes

ndgrigorian merged commit 67317b0 into master Apr 1, 2025
71 of 72 checks passed

ndgrigorian deleted the support-composite-devices branch April 1, 2025 20:49

AlexanderKalistratov reviewed Apr 2, 2025

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Support for composite devices #1993

Support for composite devices #1993

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Support for composite devices #1993

Support for composite devices #1993

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