Attached here is the script i wrote to make most of these measurements, for 
anyone interested in reproducing these results - and the raw results of the 
benchmark.

Read it before running it. You may need to make adjustments.

Rob

Attachment: bench.sh
Description: application/shellscript

Compressor,File,Size (Bytes),Compressed Size (Bytes),Ratio,Time ([hh:]mm:ss),Maximum RSS in Kbytes,Decompress time ([hh:]mm:ss),Decompress RSS in KBytes
zstd -c -T0 -18 -,cuda-10.0.130-2-x86_64.pkg.tar,3186186240,1442220663,45,1:12.50,2712508,0:04.46,10956
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zstd -c -T0 -18 -,go-2:1.12.1-1-x86_64.pkg.tar,507617280,139137995,27,0:15.40,1436664,0:00.80,11064
zstd -c -T0 -18 -,linux-5.0.3.arch1-1-x86_64.pkg.tar,84039680,73632419,87,0:07.48,306488,0:00.05,10892
zstd -c -T0 -18 -,linux-headers-5.0.3.arch1-1-x86_64.pkg.tar,108892160,19841783,18,0:12.68,328680,0:00.16,10996
zstd -c -T0 -18 -,tensorflow-1.13.1-2-x86_64.pkg.tar,317818880,64831235,20,0:15.99,877552,0:00.47,10892
zstd -c -T0 -19 -,cuda-10.0.130-2-x86_64.pkg.tar,3186186240,1438580037,45,1:34.13,3483312,0:04.47,10992
zstd -c -T0 -19 -,gcc-8.2.1+20181127-1-x86_64.pkg.tar,142120960,37393039,26,0:15.76,592888,0:00.24,10920
zstd -c -T0 -19 -,go-2:1.12.1-1-x86_64.pkg.tar,507617280,138242077,27,0:19.74,1960004,0:00.79,11040
zstd -c -T0 -19 -,linux-5.0.3.arch1-1-x86_64.pkg.tar,84039680,73585177,87,0:09.32,404812,0:00.05,10980
zstd -c -T0 -19 -,linux-headers-5.0.3.arch1-1-x86_64.pkg.tar,108892160,19799328,18,0:16.36,459760,0:00.17,10888
zstd -c -T0 -19 -,tensorflow-1.13.1-2-x86_64.pkg.tar,317818880,64477111,20,0:21.01,1204980,0:00.50,10940
zstd -c -T0 -20 -,cuda-10.0.130-2-x86_64.pkg.tar,3186186240,1438580037,45,1:34.34,3498908,0:04.46,11044
zstd -c -T0 -20 -,gcc-8.2.1+20181127-1-x86_64.pkg.tar,142120960,37393039,26,0:16.36,593004,0:00.25,11012
zstd -c -T0 -20 -,go-2:1.12.1-1-x86_64.pkg.tar,507617280,138242077,27,0:20.19,1960052,0:00.77,10980
zstd -c -T0 -20 -,linux-5.0.3.arch1-1-x86_64.pkg.tar,84039680,73585177,87,0:08.88,404716,0:00.06,10820
zstd -c -T0 -20 -,linux-headers-5.0.3.arch1-1-x86_64.pkg.tar,108892160,19799328,18,0:16.26,459768,0:00.16,11032
zstd -c -T0 -20 -,tensorflow-1.13.1-2-x86_64.pkg.tar,317818880,64477111,20,0:21.11,1205128,0:00.49,10900
zstd -c -T0 -21 -,cuda-10.0.130-2-x86_64.pkg.tar,3186186240,1438580037,45,1:31.60,3496084,0:04.46,11044
zstd -c -T0 -21 -,gcc-8.2.1+20181127-1-x86_64.pkg.tar,142120960,37393039,26,0:16.18,592904,0:00.25,10712
zstd -c -T0 -21 -,go-2:1.12.1-1-x86_64.pkg.tar,507617280,138242077,27,0:20.08,1960032,0:00.79,11040
zstd -c -T0 -21 -,linux-5.0.3.arch1-1-x86_64.pkg.tar,84039680,73585177,87,0:08.91,404768,0:00.05,10964
zstd -c -T0 -21 -,linux-headers-5.0.3.arch1-1-x86_64.pkg.tar,108892160,19799328,18,0:16.39,459748,0:00.16,10980
zstd -c -T0 -21 -,tensorflow-1.13.1-2-x86_64.pkg.tar,317818880,64477111,20,0:21.16,1205132,0:00.50,10928
xz -c -z -,cuda-10.0.130-2-x86_64.pkg.tar,3186186240,1380898716,43,19:03.44,97604,1:19.74,10420
xz -c -z -,gcc-8.2.1+20181127-1-x86_64.pkg.tar,142120960,34723000,24,0:54.54,97632,0:02.59,10352
xz -c -z -,go-2:1.12.1-1-x86_64.pkg.tar,507617280,128032556,25,3:19.11,97636,0:08.78,10400
xz -c -z -,linux-5.0.3.arch1-1-x86_64.pkg.tar,84039680,74094188,88,0:31.27,97640,0:03.85,10352
xz -c -z -,linux-headers-5.0.3.arch1-1-x86_64.pkg.tar,108892160,17844920,16,0:42.24,97636,0:01.45,10392
xz -c -z -,tensorflow-1.13.1-2-x86_64.pkg.tar,317818880,58282188,18,1:59.56,97692,0:04.78,10512
zstd -c -T0 -18 -,intellij-idea-community-edition-2:2018.3.5-1-x86_64.pkg.tar,809984000,411503795,50,0:27.10,2397200,0:00.91,10884
zstd -c -T0 -19 -,intellij-idea-community-edition-2:2018.3.5-1-x86_64.pkg.tar,809984000,410033083,50,0:37.09,3182564,0:00.93,10720
zstd -c -T0 -20 -,intellij-idea-community-edition-2:2018.3.5-1-x86_64.pkg.tar,809984000,410033083,50,0:34.43,3182456,0:00.93,10960
zstd -c -T0 -21 -,intellij-idea-community-edition-2:2018.3.5-1-x86_64.pkg.tar,809984000,410033083,50,0:35.45,3179460,0:00.94,10896
xz -c -z -,intellij-idea-community-edition-2:2018.3.5-1-x86_64.pkg.tar,809984000,403036076,49,4:53.01,97596,0:28.69,10428

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