System Performance: Multi-Tasking

One of the key drivers of advancments in computing systems is multi-tasking. On mobile devices, this is quite lightweight - cases such as background email checks while the user is playing a mobile game are quite common. Towards optimizing user experience in those types of scenarios, mobile SoC manufacturers started integrating heterogenous CPU cores - some with high performance for demanding workloads, while others were frugal in terms of both power consumption / die area and performance. This trend is now slowly making its way into the desktop PC space.

Multi-tasking in typical PC usage is much more demanding compared to phones and tablets. Desktop OSes allow users to launch and utilize a large number of demanding programs simultaneously. Responsiveness is dictated largely by the OS scheduler allowing different tasks to move to the background. Intel's Alder Lake processors work closely with the Windows 11 thread scheduler to optimize performance in these cases. Keeping these aspects in mind, the evaluation of multi-tasking performance is an interesting subject to tackle.

We have augmented our systems benchmarking suite to quantitatively analyze the multi-tasking performance of various platforms. The evaluation involves triggering a VLC transcoding task to transform 1716 3840x1714 frames encoded as a 24fps AVC video (Blender Project's 'Tears of Steel' 4K version) into a 1080p HEVC version in a loop. VLC internally uses the x265 encoder, and the settings are configured to allow the CPU usage to be saturated across all cores. The transcoding rate is monitored continuously. One complete transcoding pass is allowed to complete before starting the first multi-tasking workload - the PCMark 10 Extended bench suite. A comparative view of the PCMark 10 scores for various scenarios is presented in the graphs below. Also available for concurrent viewing are scores in the normal case where the benchmark was processed without any concurrent load, and a graph presenting the loss in performance.

UL PCMark 10 Load Testing - Digital Content Creation Scores

UL PCMark 10 Load Testing - Productivity Scores

UL PCMark 10 Load Testing - Essentials Scores

UL PCMark 10 Load Testing - Gaming Scores

UL PCMark 10 Load Testing - Overall Scores

The Alder Lake system has an inauspicious beginning, falling way behind in a set of tests it is supposedly tuned for. Based on our experience with the system, it is a combination of having lesser number of performance cores compared to Cezanne, and a BIOS that has not been tuned carefully yet.

Following the completion of the PCMark 10 benchmark, a short delay is introduced prior to the processing of Principled Technologies WebXPRT4 on MS Edge. Similar to the PCMark 10 results presentation, the graph below show the scores recorded with the transcoding load active. Available for comparison are the dedicated CPU power scores and a measure of the performance loss.

Principled Technologies WebXPRT4 Load Testing Scores (MS Edge)

The performance of Alder Lake-P is slightly better here, but still not what we saw in other Alder Lake reviews.

The final workload tested as part of the multitasking evaluation routine is CINEBENCH R23.

3D Rendering - CINEBENCH R23 Load Testing - Single Thread Score

3D Rendering - CINEBENCH R23 Load Testing - Multiple Thread Score

This is another dismal outing for the NUC BOX-1260P, with even the 1165G7 model having lesser performance loss.

After the completion of all the workloads, we let the transcoding routine run to completion. The monitored transcoding rate throughout the above evaluation routine (in terms of frames per second) for select systems are tabulated below.

VLC Transcoding Rate (Multi-Tasking Test) - Frames per Second
  Enc. Pass #1 PCMark 10 WebXPRT4 Cinebench Enc. Pass #2
ASRock NUC BOX-1260P
(Core i7-1260P ; BIOS 1.2E)
1.2859 1.1608 1.1178 1.2515 1.2855
ASRock 4X4 BOX-5800U
(Ryzen 7 5800U ; Performance Mode)
1.7057 1.5656 1.5053 1.7232 1.7086
ASRock 4X4 BOX-5800U
(Ryzen 7 5800U ; Normal Mode)
1.6200 1.4950 1.4103 1.5672 1.6708
ASRock 4X4 BOX-4800U
(Ryzen 7 4800U)
1.6366 1.5167 1.4080 1.5505 1.6073
Intel NUC11TNBi5 (Akasa Newton TN)
(Core i5-1135G7)
0.8662 0.7773 0.7275 0.7773 0.8722
ASRock NUC BOX-1165G7
(Core i7-1165G7)
0.8409 0.8004 0.7230 0.7534 0.8854

The transcoding rates in different systems drop down with simultaneous loading, as expected. While the gap is least for the Alder Lake-P system, it comes at the cost of excessive performance loss in the concurrent workloads.

GPU Performance HTPC Credentials
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  • yannigr2 - Friday, August 5, 2022 - link

    Nice review thanks.
    Considering Intel's optimizations for 3D benchmarks, 1-2 games are a necessity for closer to real life results.
  • Dante Verizon - Friday, August 5, 2022 - link

    Yes, some games and real world benchmarks...
  • PeachNCream - Saturday, August 6, 2022 - link

    Probably costs too much in terms of time and money to use real world applications. :(
  • xol - Friday, August 5, 2022 - link

    the color legend on the web/javascript seems to be messed up/makes no sense

    ..

    also I think to call the Xe gpu in the intel box as "new" is not quite right - it's not the new architecture (ie Arc) or even close, just shares the branding - it's clearly from the same series that gave us tehe HD 400 way back, and the HD 770 (such as found in the i5-12500) - the difference is that this box has 3x the EU (@96) compared to the i5-12500 (32 EU)... hence the good performance.
  • xol - Friday, August 5, 2022 - link

    postscript I'm just gonna say that using the old HD graphics architecture is no bad thing .. at least the drivers will work ! (jokes on Arc for now_
  • abufrejoval - Friday, August 5, 2022 - link

    Whatever the issues with ARC drivers might be, the iGPU drivers for Linux work quite well also with the newer Xe based variants. The worst I had to do was to force the i915 drivers to accept the unknown Xe PCI device ID via a boot parameter for the kernel.

    No issues on Windows 10/11 either, while there could be trouble with AMD GPUs on Windows server editions because AMD likes to save money on driver signatures there. I used to run Windows server on earlier APUs (Richmond/Kaveri) and had to fiddle hard to get them working anyway.
  • deil - Sunday, August 28, 2022 - link

    +1 Xe seems to work nice, EXCEPT os 21.10->22.04 upgrade. I had only one of 11400h, and it failed hard on gpu driver to the point where after bios integrated screen was completely unresponsive. (external worked fine though) Purge -> reboot -> new installation, fixed it. I always run proposed, but still that was unusual. I never had screen just nope and completely middle finger me. Otherwise, it's fine, but I personally feel like it's never under 50'c and It's annoying to use for longer, if there is any load. Might be acer fault, but I feel like all of intels are toasters now.
  • abufrejoval - Friday, August 5, 2022 - link

    I'm afraid there is no Thunderbolt in the Intel variant either..., I checked all references I could find.

    And that's really too bad, because for this to work as a µ-server I'd use the TB connector to attach 10GBase-T Ethernet based on AQC107 e.g. as sold by Sabrent. The main advantage is really solid Linux support since years, much better than for the various 2.5 variants from RealTek and Intel.

    The AQC113 chip is out there (hopefully fully AQC107 driver compatible), please ASRock add it to the base board on both devices and I shall buy one of each at least!

    2.5Gbit/s is a long overdue improvement over Gbit, but no longer adequate either. And while it will a few Watts when used at max speed (I think about 3 with Green Ethernet), these boxes aren't running on batteries.
  • abufrejoval - Friday, August 5, 2022 - link

    Ok, now finshed reading the review ;-)

    I guess the 2nd set of PCIe x4 would become allocated to Thunderbolt on the Intel variant, if that's really working. AFAIK at least some re-timer chips or similar are both required and in short supply, which is why I'd want working proof.

    AFAIK the AQC113 can do 10GBase-T out of PCIe 4.0 x1 or PCIe 3.0 x2 (or even PCIe 2.0 x4, like the AQC107). So just by dropping the 2nd Gbit, they'd gain all the resources required on Cezanne.

    Yes, a couple of millimeters in height and a Noctua cooler would make all the difference in conjunction with open power and fan settings in the BIOS.

    Since these mainboard are so similar, perhaps somebody (even ASRock) could come up with an alternate chassis?

    I have zero software issues with various kinds of Linux on my 5800U based notebook, while I'm pretty sure all that P/E drama isn't yet sorted out in enterprise Linux. I'm pretty sure that E/P won't reduce the energy footprint on such a NUC in my operations, nor provide better performance under load.

    But with systems so closely matched, at least now I could find out.
  • ganeshts - Friday, August 5, 2022 - link

    Yes, the Type-C port close to the Type-A one is indeed Thunderbolt 4. I tested out by connecting the Plugable Thunderbolt 4 Hub to it, and then connecting a Thunderbolt 3-only SSD to one of the downstream ports. I made sure that the TB3 SSD delivered PCIe performance with a quick CrystalDiskMark workload.

    ASRock also mentions it in their block diagram..

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