Forums - Question about benchmark result(csv file)

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Question about benchmark result(csv file)
Join Date: 11 May 20
Posts: 4
Posted: Tue, 2020-05-19 23:53

Hi, I have two questions about benchmark( result.

In this experiments, I use mobilenetV2.onnx file (

The result is below.

DSP_timing(1 runs)
                               avg (us) max (us) min (us)  runtime
Load                        105          105            105          CPU
Deserialize             3848 3848        3848            CPU
Create                     75472    75472   75472         CPU
Init                            82414     82414 82414               CPU
De-Init                     17164      17164    17164           CPU
Total Inference Time 4828 4828     4828            CPU
DSP_mem(1 runs)
                       avg (kB) max (kB) min (kB) runtime
pss                14910 16671            13131                NA
prv_dirty     9079       10840            7300            NA
prv_clean 5380 5380              5380               NA

<dsp result (in /SNPE_ROOT/benchmarks/alexnet_sample.json file set "Runtimes":DSP, and also while running snpe-dlc-quantize, set runtime mode 'dsp ') >

GPU_timing(1 runs)
                                                      avg (us) max (us) min (us)   runtime
Load                                             88            88           88           CPU
Deserialize                                  11669       11669        11669     CPU
Create                                          632168     632168    632168 CPU
Init                                                 661088   661088 661088   CPU
De-Init                                          17130      17130       17130      CPU
Total Inference Time           7909            7909      7909 CPU
GPU_mem(1 runs)
                               avg (kB) max (kB) min (kB) runtime
pss                            67982 79273 35765     NA
prv_dirty                   45045 56128   12476      NA
prv_clean                 22378   22712 21548       NA

<gpu result (in /SNPE_ROOT/benchmarks/alexnet_sample.json file set "Runtimes":GPU) >

At the table, the first question is what's the meaning about 'pss', 'prv_dirty', 'prv_clean' ? 

Second question is I run on the 'dsp' and 'gpu' (different settings), but why 'runtime'  show 'cpu' in timing ? (bold in table)

Thanks for the help!

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Join Date: 4 Nov 18
Posts: 154
Posted: Thu, 2020-05-21 23:48

Hi Seo,

1. Proportional Set Size (PSS) is the portion of main memory (RAM) occupied by a process and is composed of the private memory of that process plus the proportion of shared memory with one or more other processes. Unshared memory including the proportion of shared memory is reported as the PSS.

PSS of a process P1 = Private memory allocated to P1 + (Shared Memory/ Toal number of process sharing the memory)

Clean refers to the page loaded into the memory and is not read by the process but not written into. If the page is written-into and the changes are not written-out into the storage, it is called as Dirty. Pages can move from Clean to Dirty when they're written to.

Private_Clean are the pages in the mapping that have been read and not written by this process but not referenced by any other process;
Private_Dirty are the pages in the mapping that have been written by this process but not referenced by any other process.

2. This happens in the following two possible cases,

        i. If the runtime either GPU or DSP is not available in the hardware you are running the NPE Benchmakkeing tool. In some end products which are not meant for development are restricted to use the GPU/DSP even they are physically available.

        ii. If the layer is not supported by the runtime you used and is supported by the Fallback runtime.

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