Linux

quickest way to select/copy lines containing string from huge txt.gz file

由 喜你入骨 提交于 2021-02-19 04:21:49
问题 So I have the following sed one liner: sed -e '/^S|/d' -e '/^T|/d' -e '/^#D=/d' -e '/^##/d' -e 's/H|/,H|/g' -e 's/Q|/,,Q|/g' -e '1 i\,,,' sample_1.txt > sample_2.txt I have many lines that start with either: S| T| #D= ## H| Q| The idea is to not copy the lines starting with one of the first fours and to replace H| (at the beginning of lines) by ,H| and Q| (at the beginning of lines) by ,,Q| But now I would need to: use the fastest way possible (internet suggests (m)awk is faster than sed)

quickest way to select/copy lines containing string from huge txt.gz file

由 随声附和 提交于 2021-02-19 04:21:25
问题 So I have the following sed one liner: sed -e '/^S|/d' -e '/^T|/d' -e '/^#D=/d' -e '/^##/d' -e 's/H|/,H|/g' -e 's/Q|/,,Q|/g' -e '1 i\,,,' sample_1.txt > sample_2.txt I have many lines that start with either: S| T| #D= ## H| Q| The idea is to not copy the lines starting with one of the first fours and to replace H| (at the beginning of lines) by ,H| and Q| (at the beginning of lines) by ,,Q| But now I would need to: use the fastest way possible (internet suggests (m)awk is faster than sed)

How to finding all runnable processes

由 两盒软妹~` 提交于 2021-02-19 04:14:04
问题 I'm learning about the scheduler and trying to print all runnable proceeses. So I have written a kernel module that uses the for_each_process macro to iterate over all processes, and prints the ones at "runnable" state. But this seems like a stupid (and inefficient) way of doing this. So I thought about getting a reference to all running queues and use their Red-Black-Tree to go over the runnable processes, but couldn't find a way to do this. I have found out that there is a list of sched

How to finding all runnable processes

由 [亡魂溺海] 提交于 2021-02-19 04:12:48
问题 I'm learning about the scheduler and trying to print all runnable proceeses. So I have written a kernel module that uses the for_each_process macro to iterate over all processes, and prints the ones at "runnable" state. But this seems like a stupid (and inefficient) way of doing this. So I thought about getting a reference to all running queues and use their Red-Black-Tree to go over the runnable processes, but couldn't find a way to do this. I have found out that there is a list of sched

How to finding all runnable processes

由 不羁岁月 提交于 2021-02-19 04:12:25
问题 I'm learning about the scheduler and trying to print all runnable proceeses. So I have written a kernel module that uses the for_each_process macro to iterate over all processes, and prints the ones at "runnable" state. But this seems like a stupid (and inefficient) way of doing this. So I thought about getting a reference to all running queues and use their Red-Black-Tree to go over the runnable processes, but couldn't find a way to do this. I have found out that there is a list of sched

How to finding all runnable processes

由 你离开我真会死。 提交于 2021-02-19 04:12:02
问题 I'm learning about the scheduler and trying to print all runnable proceeses. So I have written a kernel module that uses the for_each_process macro to iterate over all processes, and prints the ones at "runnable" state. But this seems like a stupid (and inefficient) way of doing this. So I thought about getting a reference to all running queues and use their Red-Black-Tree to go over the runnable processes, but couldn't find a way to do this. I have found out that there is a list of sched

Qt5 linux how to set window icon image

由 会有一股神秘感。 提交于 2021-02-19 04:01:29
问题 I have a UI I have designed in Qt designer and have written the code in c++. I am using catkin, which is just cmake, to build my project. Currently when the program is launched, the application icon looks like, .I would like to have that be an image that I specify, but have been unable to figure out how to get this to work. My project directory structure looks like the following package |--CMakeLists.txt |--src |--main.cpp |--MainWindow.cpp |--resources |--images |--kitty.png |--icons.qrc |-

Jmeter压测总结

由 风格不统一 提交于 2021-02-19 04:01:18
今天说说Jmeter如何压测的方法，小结一下。 一、先使用Jmeter写好压测接口的脚本，如图所示： 二、开始进行压测参数配置 1、基本设置： (1)压测时间： 一般压测的时间是10-15分钟 (2)性能指标： TPS ：服务端每秒钟处理的请求数 越大越好 响应时间 ：越短越好 指标：tps要达到多少 ，响应时间要达到多少 ，并发数是多少 (2)在线程里设置如下： 2、压力测试场景设置 一般我们在做压力测试的时候，分单场景和混合场景，单场景也就是咱们压测单个接口的时候，多场景也就是有业务流程的情况下， 比如说一个购物流程，那么这样的场景就是混合场景，就是有多个接口一起来做操作。 (1)单场景，一个请求就可以了 (2)混合场景，多个请求 (3)压测时间，一般场景都是运行10-15分钟，如果是做疲劳测试的话，可以压一天或者一周，根据具体的情况来定 3、压力测试数据准备 在做压测的时候，数据量少和数据量大的情况下，测试的结果是不一样的。 所以，我们在设计场景的时候是要考虑到这种情况的，要测试数据库中数据量大和数据量小的情况，如果是要测试数据量大的情况下，就要造数据了，造数据可以使用jmeter，操作数据库来造数据，也可以使用python连接数据库，批量的造数据。 4、查看结果关注的几个指标 (1) tps是每秒钟处理的请求数，也就是指服务器的处理能力，tps越高说明服务器处理能力越好

Linking error: selective static linking of libm.a in GCC

由 浪尽此生 提交于 2021-02-19 03:52:28
问题 I want to selectively link libm.a statically, all the other libraries ( libc.so included) dinamically. But if I use the math functions from math.h , it almost always fails to link correctly. Why? And why does it work sometimes? (For example if I only use sqrt , fabs or, strangely, tanh , it seems to link correctly) myscript.sh: #!/bin/bash for i in sqrt tanh sin tan do echo "-----$i----------" sed "s/ciao/$i/" prova.c >provat.c gcc provat.c -fno-builtin -l:libm.a [[ $? -eq 0 ]] && { echo -n "

upgrading default python version or install another python version in Linux

由 断了今生、忘了曾经 提交于 2021-02-19 03:47:28
问题 I want to upgrade python's default version i.e /usr/bin/python in Linux. I have multiple python versions installed as /usr/bin/python2.7 /usr/bin/python3.3 However, python command still returns python2.7 # python Python 2.7 Type "help", "copyright", "credits" or "license" for more information. >>> Now, I have installed a module, which got installed in the default version 2.7 . That's why I can't use python3.3 script.py , as it returns error for missing module. How to update this default
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