[DTrace-devel] [PATCH] Reduce memory consumption of tst.llquantstep.d
Kris Van Hees
kris.van.hees at oracle.com
Thu Jan 28 12:21:10 PST 2021
On Thu, Jan 28, 2021 at 02:49:28PM -0500, eugene.loh at oracle.com wrote:
> From: Eugene Loh <eugene.loh at oracle.com>
>
> For log-linear aggregation, the parameters are factor, lmag, hmag,
> and steps. For each log range -- from pow(factor,mag) to
> pow(factor,mag+1) -- values are quantized into steps bins.
> Thus, it is sufficient for steps to divide pow(factor,lmag) even
> if it does not divide pow(factor,2). Checking this is the aim of
> this test.
>
> The test clearly checks the case where lmag>2. At a minimum, lmag=3.
> The test uses steps=pow(factor,3).
>
> The size of the aggregation is
> ((hmag - lmag + 1) * (steps - steps / factor) * 2 + 3) * sizeof(u64)
> For the test's parameters, that comes out to about 57 Kbytes, which is
> relatively large. Since the test's footprint scales as pow(factor,3),
> a reduction in factor can reduce the footprint considerably.
>
> Adjust the test's parameters to reduce the map footprint while
> still testing the same objectives. A beneficial byproduct is that
> a successful run will generate (~900 lines) less output.
>
> Signed-off-by: Eugene Loh <eugene.loh at oracle.com>
Reviewed-by: Kris Van Hees <kris.van.hees at oracle.com>
> ---
> test/unittest/aggs/tst.llquantstep.d | 13 +-
> test/unittest/aggs/tst.llquantstep.r | 1010 ++------------------------
> 2 files changed, 62 insertions(+), 961 deletions(-)
>
> diff --git a/test/unittest/aggs/tst.llquantstep.d b/test/unittest/aggs/tst.llquantstep.d
> index d4a8ec60..4c055bf0 100644
> --- a/test/unittest/aggs/tst.llquantstep.d
> +++ b/test/unittest/aggs/tst.llquantstep.d
> @@ -1,29 +1,26 @@
> /*
> * Oracle Linux DTrace.
> - * Copyright (c) 2014, 2020, Oracle and/or its affiliates. All rights reserved.
> + * Copyright (c) 2014, 2021, Oracle and/or its affiliates. All rights reserved.
> * Licensed under the Universal Permissive License v 1.0 as shown at
> * http://oss.oracle.com/licenses/upl.
> */
> -/* @@xfail: dtv2 */
>
> /*
> - * ASSERTION:
> - * A step value that evenly divides factor ** lmag, but not
> - * factor ** 2, works correctly.
> + * ASSERTION: A step value that evenly divides factor ** lmag,
> + * but not factor ** 2, works correctly.
> *
> * SECTION: Aggregations/Aggregations
> - *
> */
>
> #pragma D option quiet
>
> tick-1ms
> {
> - @ = llquantize(i++, 10, 3, 6, 1000);
> + @ = llquantize(i++, 3, 3, 5, 27);
> }
>
> tick-1ms
> -/i == 15000/
> +/i == 1500/
> {
> exit(0);
> }
> diff --git a/test/unittest/aggs/tst.llquantstep.r b/test/unittest/aggs/tst.llquantstep.r
> index 6e8f6524..a5f84e69 100644
> --- a/test/unittest/aggs/tst.llquantstep.r
> +++ b/test/unittest/aggs/tst.llquantstep.r
> @@ -1,957 +1,61 @@
>
>
> value ------------- Distribution ------------- count
> - -1000 | 0
> - abs() < 1000 |@@@ 1000
> - 1000 | 10
> - 1010 | 10
> - 1020 | 10
> - 1030 | 10
> - 1040 | 10
> - 1050 | 10
> - 1060 | 10
> - 1070 | 10
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> - 1090 | 10
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> - 1110 | 10
> - 1120 | 10
> - 1130 | 10
> - 1140 | 10
> - 1150 | 10
> - 1160 | 10
> - 1170 | 10
> - 1180 | 10
> - 1190 | 10
> - 1200 | 10
> - 1210 | 10
> - 1220 | 10
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> - 1260 | 10
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> - 1380 | 10
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> - 1490 | 10
> - 1500 | 10
> - 1510 | 10
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> - 1960 | 10
> - 1970 | 10
> - 1980 | 10
> - 1990 | 10
> - 2000 | 10
> - 2010 | 10
> - 2020 | 10
> - 2030 | 10
> - 2040 | 10
> - 2050 | 10
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> - 2090 | 10
> - 2100 | 10
> - 2110 | 10
> - 2120 | 10
> - 2130 | 10
> - 2140 | 10
> - 2150 | 10
> - 2160 | 10
> - 2170 | 10
> - 2180 | 10
> - 2190 | 10
> - 2200 | 10
> - 2210 | 10
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> - 2230 | 10
> - 2240 | 10
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> - 2260 | 10
> - 2270 | 10
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> - 2290 | 10
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> - 2750 | 10
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> - 2770 | 10
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> - 2790 | 10
> - 2800 | 10
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> - 2820 | 10
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> - 2850 | 10
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> - 9850 | 10
> - 9860 | 10
> - 9870 | 10
> - 9880 | 10
> - 9890 | 10
> - 9900 | 10
> - 9910 | 10
> - 9920 | 10
> - 9930 | 10
> - 9940 | 10
> - 9950 | 10
> - 9960 | 10
> - 9970 | 10
> - 9980 | 10
> - 9990 | 10
> - 10000 | 100
> - 10100 | 100
> - 10200 | 100
> - 10300 | 100
> - 10400 | 100
> - 10500 | 100
> - 10600 | 100
> - 10700 | 100
> - 10800 | 100
> - 10900 | 100
> - 11000 | 100
> - 11100 | 100
> - 11200 | 100
> - 11300 | 100
> - 11400 | 100
> - 11500 | 100
> - 11600 | 100
> - 11700 | 100
> - 11800 | 100
> - 11900 | 100
> - 12000 | 100
> - 12100 | 100
> - 12200 | 100
> - 12300 | 100
> - 12400 | 100
> - 12500 | 100
> - 12600 | 100
> - 12700 | 100
> - 12800 | 100
> - 12900 | 100
> - 13000 | 100
> - 13100 | 100
> - 13200 | 100
> - 13300 | 100
> - 13400 | 100
> - 13500 | 100
> - 13600 | 100
> - 13700 | 100
> - 13800 | 100
> - 13900 | 100
> - 14000 | 100
> - 14100 | 100
> - 14200 | 100
> - 14300 | 100
> - 14400 | 100
> - 14500 | 100
> - 14600 | 100
> - 14700 | 100
> - 14800 | 100
> - 14900 | 100
> - 15000 | 0
> + -27 | 0
> + abs() < 27 |@ 27
> + 27 | 3
> + 30 | 3
> + 33 | 3
> + 36 | 3
> + 39 | 3
> + 42 | 3
> + 45 | 3
> + 48 | 3
> + 51 | 3
> + 54 | 3
> + 57 | 3
> + 60 | 3
> + 63 | 3
> + 66 | 3
> + 69 | 3
> + 72 | 3
> + 75 | 3
> + 78 | 3
> + 81 | 9
> + 90 | 9
> + 99 | 9
> + 108 | 9
> + 117 | 9
> + 126 | 9
> + 135 | 9
> + 144 | 9
> + 153 | 9
> + 162 | 9
> + 171 | 9
> + 180 | 9
> + 189 | 9
> + 198 | 9
> + 207 | 9
> + 216 | 9
> + 225 | 9
> + 234 | 9
> + 243 |@ 27
> + 270 |@ 27
> + 297 |@ 27
> + 324 |@ 27
> + 351 |@ 27
> + 378 |@ 27
> + 405 |@ 27
> + 432 |@ 27
> + 459 |@ 27
> + 486 |@ 27
> + 513 |@ 27
> + 540 |@ 27
> + 567 |@ 27
> + 594 |@ 27
> + 621 |@ 27
> + 648 |@ 27
> + 675 |@ 27
> + 702 |@ 27
> + >= 729 |@@@@@@@@@@@@@@@@@@@@@ 771
>
> --
> 2.18.4
>
>
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