Csaba Ringhofer has posted comments on this change. ( http://gerrit.cloudera.org:8080/24579 )
Change subject: IMPALA-15139: Support DELTA_LENGTH_BYTE_ARRAY Parquet encoding ...................................................................... Patch Set 19: Code-Review+2 (1 comment) http://gerrit.cloudera.org:8080/#/c/24579/16/be/src/benchmarks/parquet-delta-length-byte-array-benchmark.cc File be/src/benchmarks/parquet-delta-length-byte-array-benchmark.cc: http://gerrit.cloudera.org:8080/#/c/24579/16/be/src/benchmarks/parquet-delta-length-byte-array-benchmark.cc@31 PS16, Line 31: // all-long 146 iters/ms 1X (zero-copy: only pointer stored, no Smallify) : // mixed M-L 137 iters/ms 0.94X (short-first phase: S,L,S,L) > Did some experiments on this. The deviation comes purely from the ORDER of >core warms up to its full turbo frequency note that we should do tests without turbo (making them slower) this is what I do before running benchmarks on my Ubuntu: echo 1 | sudo tee /sys/devices/system/cpu/intel_pstate/no_turbo echo performance | sudo tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor and this is how I switch back to normal operation: echo 0 | sudo tee /sys/devices/system/cpu/intel_pstate/no_turbo echo powersave | sudo tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor -- To view, visit http://gerrit.cloudera.org:8080/24579 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-MessageType: comment Gerrit-Change-Id: I9e4395fa30cd7fb2c89ef5a2b16b043d4de60b52 Gerrit-Change-Number: 24579 Gerrit-PatchSet: 19 Gerrit-Owner: Mihaly Szjatinya <[email protected]> Gerrit-Reviewer: Balazs Hevele <[email protected]> Gerrit-Reviewer: Csaba Ringhofer <[email protected]> Gerrit-Reviewer: Impala Public Jenkins <[email protected]> Gerrit-Reviewer: Mihaly Szjatinya <[email protected]> Gerrit-Reviewer: Zoltan Borok-Nagy <[email protected]> Gerrit-Comment-Date: Wed, 09 Sep 2026 15:04:11 +0000 Gerrit-HasComments: Yes
