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摘要: [root@linuxcool ~]# fio -filename=linuxcool -direct=1 -iodepth 1 -thread -rw=read -ioengine=psync -bs=16k -size=10G -numjobs=10 -runtime=100 -group_re 阅读全文
posted @ 2023-02-18 12:01 stdpain 阅读(42) 评论(0) 推荐(0)
摘要: awk '{if(min==""){min=max=$5}; if($5>max) {max=$5}; if($5<min) {min=$5}; total+=$5; count+=1} END {print "avg " total/count," | max "max," | min " min 阅读全文
posted @ 2022-12-08 15:48 stdpain 阅读(33) 评论(0) 推荐(0)
摘要: export ASAN_OPTIONS=abort_on_error=1:disable_coredump=0:unmap_shadow_on_exit=1 https://stackoverflow.com/questions/42851670/how-to-generate-core-dump- 阅读全文
posted @ 2022-09-16 20:54 stdpain 阅读(264) 评论(0) 推荐(0)
摘要: 物化我的理解就是获取某一个结果(或是这中间结果) 比如我有一个表 table: k1,k2,v1,v2,v3 如果我执行一个简单的SQL select k1,k2 from table 如果我们的数据存储格式是按列组织的(列存),那么我们只需要物化k1,k2 (只需要扫描k1,k2所在的列),而v1 阅读全文
posted @ 2022-09-16 20:47 stdpain 阅读(506) 评论(0) 推荐(0)
摘要: https://stackoverflow.com/questions/22029834/possible-to-call-inline-functions-in-gdb-and-or-emit-them-using-gcc 阅读全文
posted @ 2022-08-19 14:20 stdpain 阅读(30) 评论(0) 推荐(0)
摘要: g++ -O3 bench.cpp ``` // https://stackoverflow.com/questions/40950254/speed-up-random-memory-access-using-prefetch #include #include #include #include 阅读全文
posted @ 2022-07-31 20:44 stdpain 阅读(553) 评论(0) 推荐(0)
摘要: apt-get install binutils-dev yum install binutils-devel 阅读全文
posted @ 2022-07-29 15:22 stdpain 阅读(57) 评论(0) 推荐(0)
摘要: https://developer.aliyun.com/mirror/maven?spm=a2c6h.13651102.0.0.7be81b11Z03b5j <settings xmlns="http://maven.apache.org/SETTINGS/1.0.0" xmlns:xsi="ht 阅读全文
posted @ 2022-07-09 17:35 stdpain 阅读(62) 评论(0) 推荐(0)
摘要: Umbra: A Disk-Based System with In-Memory Performance http://db.in.tum.de/~freitag/papers/p29-neumann-cidr20.pdf TOWARDS PRACTICAL VECTORIZED ANALYTIC 阅读全文
posted @ 2022-06-01 19:34 stdpain 阅读(33) 评论(0) 推荐(0)
摘要: ((void***)0x60600053b770)[0] 阅读全文
posted @ 2022-05-31 10:17 stdpain 阅读(35) 评论(0) 推荐(0)
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