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SubjectRe: Re: [RFC v5 0/7] Implement Data Access Monitoring-based Memory Operation Schemes
Date
On Tue, 31 Mar 2020 16:51:55 +0100 Jonathan Cameron <Jonathan.Cameron@Huawei.com> wrote:

> On Mon, 30 Mar 2020 13:50:35 +0200
> SeongJae Park <sjpark@amazon.com> wrote:
>
> > From: SeongJae Park <sjpark@amazon.de>
> >
> > DAMON[1] can be used as a primitive for data access awared memory management
> > optimizations. That said, users who want such optimizations should run DAMON,
> > read the monitoring results, analyze it, plan a new memory management scheme,
> > and apply the new scheme by themselves. Such efforts will be inevitable for
> > some complicated optimizations.
> >
> > However, in many other cases, the users could simply want the system to apply a
> > memory management action to a memory region of a specific size having a
> > specific access frequency for a specific time. For example, "page out a memory
> > region larger than 100 MiB keeping only rare accesses more than 2 minutes", or
> > "Do not use THP for a memory region larger than 2 MiB rarely accessed for more
> > than 1 seconds".
> >
> > This RFC patchset makes DAMON to handle such data access monitoring-based
> > operation schemes. With this change, users can do the data access awared
> > optimizations by simply specifying their schemes to DAMON.
>
>
> Hi SeongJae,
>
> I'm wondering if I'm misreading the results below or a data handling mixup
> occured. See inline.

Thank you for question, Jonathan!

>
> Thanks,
>
> Jonathan
>
> >
[...]
> > Results
> > -------
> >
> > Below two tables show the measurement results. The runtimes are in seconds
> > while the memory usages are in KiB. Each configurations except 'orig' shows
> > its overhead relative to 'orig' in percent within parenthesises.
> >
> > runtime orig rec (overhead) thp (overhead) ethp (overhead) prcl (overhead)
> > parsec3/blackscholes 107.594 107.956 (0.34) 106.750 (-0.78) 107.672 (0.07) 111.916 (4.02)
> > parsec3/bodytrack 79.230 79.368 (0.17) 78.908 (-0.41) 79.705 (0.60) 80.423 (1.50)
> > parsec3/canneal 142.831 143.810 (0.69) 123.530 (-13.51) 133.778 (-6.34) 144.998 (1.52)
> > parsec3/dedup 11.986 11.959 (-0.23) 11.762 (-1.87) 12.028 (0.35) 13.313 (11.07)
> > parsec3/facesim 210.125 209.007 (-0.53) 205.226 (-2.33) 207.766 (-1.12) 209.815 (-0.15)
> > parsec3/ferret 191.601 191.177 (-0.22) 190.420 (-0.62) 191.775 (0.09) 192.638 (0.54)
> > parsec3/fluidanimate 212.735 212.970 (0.11) 209.151 (-1.68) 211.904 (-0.39) 218.573 (2.74)
> > parsec3/freqmine 291.225 290.873 (-0.12) 289.258 (-0.68) 289.884 (-0.46) 298.373 (2.45)
> > parsec3/raytrace 118.289 119.586 (1.10) 119.045 (0.64) 119.064 (0.66) 137.919 (16.60)
> > parsec3/streamcluster 323.565 328.168 (1.42) 279.565 (-13.60) 287.452 (-11.16) 333.244 (2.99)
> > parsec3/swaptions 155.140 155.473 (0.21) 153.816 (-0.85) 156.423 (0.83) 156.237 (0.71)
> > parsec3/vips 58.979 59.311 (0.56) 58.733 (-0.42) 59.005 (0.04) 61.062 (3.53)
> > parsec3/x264 70.539 68.413 (-3.01) 64.760 (-8.19) 67.180 (-4.76) 68.103 (-3.45)
> > splash2x/barnes 80.414 81.751 (1.66) 73.585 (-8.49) 80.232 (-0.23) 115.753 (43.95)
> > splash2x/fft 33.902 34.111 (0.62) 24.228 (-28.53) 29.926 (-11.73) 44.438 (31.08)
> > splash2x/lu_cb 85.556 86.001 (0.52) 84.538 (-1.19) 86.000 (0.52) 91.447 (6.89)
> > splash2x/lu_ncb 93.399 93.652 (0.27) 90.463 (-3.14) 94.008 (0.65) 93.901 (0.54)
> > splash2x/ocean_cp 45.253 45.191 (-0.14) 43.049 (-4.87) 44.022 (-2.72) 46.588 (2.95)
> > splash2x/ocean_ncp 86.927 87.065 (0.16) 50.747 (-41.62) 86.855 (-0.08) 199.553 (129.57)
> > splash2x/radiosity 91.433 91.511 (0.09) 90.626 (-0.88) 91.865 (0.47) 104.524 (14.32)
> > splash2x/radix 31.923 32.023 (0.31) 25.194 (-21.08) 32.035 (0.35) 39.231 (22.89)
> > splash2x/raytrace 84.367 84.677 (0.37) 82.417 (-2.31) 83.505 (-1.02) 84.857 (0.58)
> > splash2x/volrend 87.499 87.495 (-0.00) 86.775 (-0.83) 87.311 (-0.21) 87.511 (0.01)
> > splash2x/water_nsquared 236.397 236.759 (0.15) 219.902 (-6.98) 224.228 (-5.15) 238.562 (0.92)
> > splash2x/water_spatial 89.646 89.767 (0.14) 89.735 (0.10) 90.347 (0.78) 103.585 (15.55)
> > total 3020.570 3028.080 (0.25) 2852.190 (-5.57) 2953.960 (-2.21) 3276.550 (8.47)
> >
> >
> > memused.avg orig rec (overhead) thp (overhead) ethp (overhead) prcl (overhead)
> > parsec3/blackscholes 1785916.600 1834201.400 (2.70) 1826249.200 (2.26) 1828079.200 (2.36) 1712210.600 (-4.13)
> > parsec3/bodytrack 1415049.400 1434317.600 (1.36) 1423715.000 (0.61) 1430392.600 (1.08) 1435136.000 (1.42)
> > parsec3/canneal 1043489.800 1058617.600 (1.45) 1040484.600 (-0.29) 1048664.800 (0.50) 1050280.000 (0.65)
> > parsec3/dedup 2414453.200 2458493.200 (1.82) 2411379.400 (-0.13) 2400516.000 (-0.58) 2461120.800 (1.93)
> > parsec3/facesim 541597.200 550097.400 (1.57) 544364.600 (0.51) 553240.000 (2.15) 552316.400 (1.98)
> > parsec3/ferret 317986.600 332346.000 (4.52) 320218.000 (0.70) 331085.000 (4.12) 330895.200 (4.06)
> > parsec3/fluidanimate 576183.400 585442.000 (1.61) 577780.200 (0.28) 587703.400 (2.00) 506501.000 (-12.09)
> > parsec3/freqmine 990869.200 997817.000 (0.70) 990350.400 (-0.05) 997669.000 (0.69) 763325.800 (-22.96)
> > parsec3/raytrace 1748370.800 1757109.200 (0.50) 1746153.800 (-0.13) 1757830.400 (0.54) 1581455.800 (-9.55)
> > parsec3/streamcluster 121521.800 140452.400 (15.58) 129725.400 (6.75) 132266.000 (8.84) 130558.200 (7.44)
> > parsec3/swaptions 15592.400 29018.800 (86.11) 14765.800 (-5.30) 27260.200 (74.83) 26631.600 (70.80)
> > parsec3/vips 2957567.600 2967993.800 (0.35) 2956623.200 (-0.03) 2973062.600 (0.52) 2951402.000 (-0.21)
> > parsec3/x264 3169012.400 3175048.800 (0.19) 3190345.400 (0.67) 3189353.000 (0.64) 3172924.200 (0.12)
> > splash2x/barnes 1209066.000 1213125.400 (0.34) 1217261.400 (0.68) 1209661.600 (0.05) 921041.800 (-23.82)
> > splash2x/fft 9359313.200 9195213.000 (-1.75) 9377562.400 (0.19) 9050957.600 (-3.29) 9517977.000 (1.70)
> > splash2x/lu_cb 514966.200 522939.400 (1.55) 520870.400 (1.15) 522635.000 (1.49) 329933.600 (-35.93)
> > splash2x/lu_ncb 514180.400 525974.800 (2.29) 521420.200 (1.41) 521063.600 (1.34) 523557.000 (1.82)
> > splash2x/ocean_cp 3346493.400 3288078.000 (-1.75) 3382253.800 (1.07) 3289477.600 (-1.70) 3260810.400 (-2.56)
> > splash2x/ocean_ncp 3909966.400 3882968.800 (-0.69) 7037196.000 (79.98) 4046363.400 (3.49) 3471452.400 (-11.22)
> > splash2x/radiosity 1471119.400 1470626.800 (-0.03) 1482604.200 (0.78) 1472718.400 (0.11) 546893.600 (-62.82)
> > splash2x/radix 1748360.800 1729163.400 (-1.10) 1371463.200 (-21.56) 1701993.600 (-2.65) 1817519.600 (3.96)
> > splash2x/raytrace 46670.000 60172.200 (28.93) 51901.600 (11.21) 60782.600 (30.24) 52644.800 (12.80)
> > splash2x/volrend 150666.600 167444.200 (11.14) 151335.200 (0.44) 163345.000 (8.41) 162760.000 (8.03)
> > splash2x/water_nsquared 45720.200 59422.400 (29.97) 46031.000 (0.68) 61801.400 (35.17) 62627.000 (36.98)
> > splash2x/water_spatial 663052.200 672855.800 (1.48) 665787.600 (0.41) 674696.200 (1.76) 471052.600 (-28.96)
> > total 40077300.000 40108900.000 (0.08) 42997900.000 (7.29) 40032700.000 (-0.11) 37813000.000 (-5.65)
> >
> >
[...]
> >
> > Efficient THP
> > ~~~~~~~~~~~~~
> >
> > THP 'always' enabled policy achieves 5.57% speedup but incurs 7.29% memory
> > overhead. It achieves 41.62% speedup in best case, but 79.98% memory overhead
> > in worst case. Interestingly, both the best and worst case are with
> > 'splash2x/ocean_ncp').
>
> The results above don't seems to support this any more?
>
> > runtime orig rec (overhead) thp (overhead) ethp (overhead) prcl (overhead)
> > splash2x/ocean_ncp 86.927 87.065 (0.16) 50.747 (-41.62) 86.855 (-0.08) 199.553 (129.57)

Hmm... But, I don't get what point you meaning... In the data, column of 'thp'
means the THP 'always' enabled policy. And, the following column shows the
overhead of it compared to that of 'orig', in percent. Thus, the data says THP
'always' enabled policy enabled kernel consumes 50.747 seconds to finish
splash2x/ocean_ncp, while THP disabled original kernel consumes 86.927 seconds.
Thus, the overhead is ``(50.747 - 86.927) / 86.927 = -0.4162``. In other
words, 41.62% speedup.

Also, 5.57% speedup and 7.29% memory overhead is for _total_. This data shows
it.

> > runtime orig rec (overhead) thp (overhead) ethp (overhead) prcl (overhead)
> > total 3020.570 3028.080 (0.25) 2852.190 (-5.57) 2953.960 (-2.21) 3276.550 (8.47)

Maybe I made you confused by ambiguously saying this. Sorry if so. Or, if I'm
still misunderstanding your point, please let me know.


Thanks,
SeongJae Park

[...]

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