Em qua., 25 de mai. de 2022 às 07:13, Tomas Vondra < tomas.von...@enterprisedb.com> escreveu:
> > > On 5/25/22 11:07, Ranier Vilela wrote: > > Em qua., 25 de mai. de 2022 às 00:46, Andres Freund <and...@anarazel.de > > <mailto:and...@anarazel.de>> escreveu: > > > > Hi Andres, thank you for taking a look. > > > > > > On 2022-05-24 12:28:20 -0300, Ranier Vilela wrote: > > > Linux Ubuntu 64 bits (gcc 9.4) > > > ./pgbench -M prepared -c $conns -j $conns -S -n -U postgres > > > > > > conns tps head tps patched > > > 1 2918.004085 3190.810466 > > > 10 12262.415696 17199.862401 > > > 50 13656.724571 18278.194114 > > > 80 14338.202348 17955.336101 > > > 90 16597.510373 18269.660184 > > > 100 17706.775793 18349.650150 > > > 200 16877.067441 17881.250615 > > > 300 16942.260775 17181.441752 > > > 400 16794.514911 17124.533892 > > > 500 16598.502151 17181.244953 > > > 600 16717.935001 16961.130742 > > > 700 16651.204834 16959.172005 > > > 800 16467.546583 16834.591719 > > > 900 16588.241149 16693.902459 > > > 1000 16564.985265 16936.952195 > > > > 17-18k tps is pretty low for pgbench -S. For a shared_buffers > > resident run, I > > can get 40k in a single connection in an optimized build. If you're > > testing a > > workload >> shared_buffers, GetSnapshotData() isn't the bottleneck. > And > > testing an assert build isn't a meaningful exercise either, unless > > you have > > way way higher gains (i.e. stuff like turning O(n^2) into O(n)). > > > > Thanks for sharing these hits. > > Yes, their 17-18k tps are disappointing. > > > > > > What pgbench scale is this and are you using an optimized build? > > > > Yes this optimized build. > > CFLAGS='-Wall -Wmissing-prototypes -Wpointer-arith > > -Wdeclaration-after-statement -Werror=vla -Wendif-labels > > -Wmissing-format-attribute -Wimplicit-fallthrough=3 -Wcast-function-type > > -Wformat-security -fno-strict-aliasing -fwrapv > > -fexcess-precision=standard -Wno-format-truncation > > -Wno-stringop-truncation -O2' > > from config.log > > > > That can still be assert-enabled build. We need to see configure flags. > ./configure Attached the config.log (compressed) > > > pgbench was initialized with: > > pgbench -i -p 5432 -d postgres > > > > pgbench -M prepared -c 100 -j 100 -S -n -U postgres > > You're not specifying duration/number of transactions to execute. So > it's using just 10 transactions per client, which is bound to give you > bogus results due to not having anything in relcache etc. Use -T 60 or > something like that. > Ok, I will try with -T 60. > > > pgbench (15beta1) > > transaction type: <builtin: select only> > > scaling factor: 1 > > query mode: prepared > > number of clients: 100 > > number of threads: 100 > > > > The shared_buffers is default: > > shared_buffers = 128MB > > > > Intel® Core™ i5-8250U CPU Quad Core > > RAM 8GB > > SSD 256 GB > > > > Well, quick results on my laptop (i7-9750H, so not that different from > what you have): > > 1 = 18908.080126 > 2 = 32943.953182 > 3 = 42316.079028 > 4 = 46700.087645 > > So something is likely wrong in your setup. > select version(); version ---------------------------------------------------------------------------------------------------------- PostgreSQL 15beta1 on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0, 64-bit Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu 9.4.0-1ubuntu1~20.04.1' --with-bugurl=file:///usr/share/doc/gcc-9/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,gm2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-9 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none=/build/gcc-9-Av3uEd/gcc-9-9.4.0/debian/tmp-nvptx/usr,hsa --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix gcc version 9.4.0 (Ubuntu 9.4.0-1ubuntu1~20.04.1) regards, Ranier Vilela
config.tar.xz
Description: application/xz
